This page has only limited features, please log in for full access.
Polymer composites reinforced with natural fabric have recently been investigated as possible ballistic armor for personal protection against different levels of ammunition. In particular, fabric made of fique fibers, which is extracted from the leaves of the Furcraea andina, was applied as reinforcement for polymer composites used in a multilayered armor system (MAS). The superior performance of the fique fabric composites as a second MAS layer motivated this brief report on the determination of the absorbed energy and capability to limit velocity in the stand-alone ballistic tests. The single plates of epoxy composites, which were reinforced with up to 50 vol% of fique fabric, were ballistic tested as targets against 7.62 mm high-speed, ~840 m/s, impact ammunition for the first time. The results were statistically analyzed by the Weibull method and ANOVA. The absorbed energies of the 200–219 J and limit velocities of 202–211 m/s were found statistically similar to the epoxy composites reinforced with the fique fabric from 15 to 50 vol%. Predominantly, these findings are better than those reported for the plain epoxy and aramid fabric (KevlarTM) used as stand-alone plates with the same thickness. Macrocracks in the 15 and 30 vol% fique fabric composites compromise their application as armor plates. The delamination rupture mechanism was revealed by scanning electron microscopy. By contrast, the integrity was maintained in the 40 and 50 vol% composites, ensuring superior ballistic protection compared to the use of KevlarTM.
Michelle Souza Oliveira; Fernanda Santos da Luz; Henry Alonso Colorado Lopera; Lucio Fabio Cassiano Nascimento; Fabio Da Costa Garcia Filho; Sergio Neves Monteiro. Energy Absorption and Limit Velocity of Epoxy Composites Incorporated with Fique Fabric as Ballistic Armor—A Brief Report. Polymers 2021, 13, 2727 .
AMA StyleMichelle Souza Oliveira, Fernanda Santos da Luz, Henry Alonso Colorado Lopera, Lucio Fabio Cassiano Nascimento, Fabio Da Costa Garcia Filho, Sergio Neves Monteiro. Energy Absorption and Limit Velocity of Epoxy Composites Incorporated with Fique Fabric as Ballistic Armor—A Brief Report. Polymers. 2021; 13 (16):2727.
Chicago/Turabian StyleMichelle Souza Oliveira; Fernanda Santos da Luz; Henry Alonso Colorado Lopera; Lucio Fabio Cassiano Nascimento; Fabio Da Costa Garcia Filho; Sergio Neves Monteiro. 2021. "Energy Absorption and Limit Velocity of Epoxy Composites Incorporated with Fique Fabric as Ballistic Armor—A Brief Report." Polymers 13, no. 16: 2727.
Since the mid-2000s, several studies were carried out regarding the development of ballistic resistant materials based on polymeric matrix composites reinforced with natural lignocellulosic fibers (NLFs). The results reported so far are promising and are often comparable to commonly used materials such as KevlarTM, especially when used as an intermediate layer in a multilayer armor system (MAS). However, the most suitable configuration for these polymer composites reinforced with NLFs when subjected to high strain rates still lacks investigation. This work aimed to evaluate four possible arrangements for epoxy matrix composite reinforced with a stiff Brazilian NLF, piassava fiber, regarding energy absorption, and ballistic efficiency. Performance was evaluated against the ballistic impact of high-energy 7.62 mm ammunition. Obtained results were statistically validated by means of analysis of variance (ANOVA) and Tukey’s honest test. Furthermore, the micromechanics associated with the failure of these composites were determined. Energy absorption of the same magnitude as KevlarTM and indentation depth below the limit predicted by NIJ standard were obtained for all conditions.
Fabio Garcia Filho; Fernanda Luz; Michelle Oliveira; Wendell Bezerra; Josiane Barbosa; Sergio Monteiro. Influence of Rigid Brazilian Natural Fiber Arrangements in Polymer Composites: Energy Absorption and Ballistic Efficiency. Journal of Composites Science 2021, 5, 201 .
AMA StyleFabio Garcia Filho, Fernanda Luz, Michelle Oliveira, Wendell Bezerra, Josiane Barbosa, Sergio Monteiro. Influence of Rigid Brazilian Natural Fiber Arrangements in Polymer Composites: Energy Absorption and Ballistic Efficiency. Journal of Composites Science. 2021; 5 (8):201.
Chicago/Turabian StyleFabio Garcia Filho; Fernanda Luz; Michelle Oliveira; Wendell Bezerra; Josiane Barbosa; Sergio Monteiro. 2021. "Influence of Rigid Brazilian Natural Fiber Arrangements in Polymer Composites: Energy Absorption and Ballistic Efficiency." Journal of Composites Science 5, no. 8: 201.
Fibers extracted from Amazonian plants that have traditionally been used by local communities to produce simple items such as ropes, nets, and rugs, are now recognized as promising composite reinforcements. This is the case for guaruman (Ischinosiphon körn) fiber, which was recently found to present potential mechanical and ballistic properties as 30 vol% reinforcement of epoxy composites. To complement these properties, Izod impact tests are now communicated in this brief report for similar composites with up to 30 vol% of guaruman fibers. A substantial increase in impact resistance, with over than 20 times the absorbed energy for the 30 vol% guaruman fiber composite, was obtained in comparison to neat epoxy. These results were statistically validated by Weibull analysis, ANOVA, and Tukey’s test. Scanning electron microscopy analysis disclosed the mechanisms responsible for the impact performance of the guaruman fiber composites.
Raphael Reis; Fabio Garcia Filho; Larissa Nunes; Veronica Candido; Alisson Silva; Sergio Monteiro. Impact Resistance of Epoxy Composites Reinforced with Amazon Guaruman Fiber: A Brief Report. Polymers 2021, 13, 2264 .
AMA StyleRaphael Reis, Fabio Garcia Filho, Larissa Nunes, Veronica Candido, Alisson Silva, Sergio Monteiro. Impact Resistance of Epoxy Composites Reinforced with Amazon Guaruman Fiber: A Brief Report. Polymers. 2021; 13 (14):2264.
Chicago/Turabian StyleRaphael Reis; Fabio Garcia Filho; Larissa Nunes; Veronica Candido; Alisson Silva; Sergio Monteiro. 2021. "Impact Resistance of Epoxy Composites Reinforced with Amazon Guaruman Fiber: A Brief Report." Polymers 13, no. 14: 2264.
Since the twenty-first century began, environmental concerns related to energetic consumption and pollution have been gaining attention. In part, these could be associated with production and disregard synthetic materials. Using natural materials instead of synthetic aimed to become a trend, which has not happened. Natural lignocellulosic fibers (NLFs) were showed to be capable of replacing synthetic fibers in polymer composites. However, some limitations such as damage from heat can be considered a major constraint for wider application of NLFs/polymer composites. A novel strategy that is suggested to improve this property is the graphene oxide (GO) functionalization of NLFs. This work investigates the thermal behavior of epoxy/NLF composites, with and without GO functionalization. Two different amounts of reinforcement, low (20 vol%) and high (40 vol%), were dynamic mechanically investigated up to 160 °C. Investigated parameters revealed notable changes attributed to GO-functionalization effect on the NLF regarding viscous stiffness and damping capacity of the composite.
Fabio Da Costa Garcia Filho; Michelle Souza Oliveira; Fernanda Santos da Luz; Sergio Neves Monteiro. Influence of Graphene Oxide Functionalization Strategy on the Dynamic Mechanical Response of Natural Fiber Reinforced Polymer Matrix Composites. The Minerals, Metals & Materials Series 2021, 29 -36.
AMA StyleFabio Da Costa Garcia Filho, Michelle Souza Oliveira, Fernanda Santos da Luz, Sergio Neves Monteiro. Influence of Graphene Oxide Functionalization Strategy on the Dynamic Mechanical Response of Natural Fiber Reinforced Polymer Matrix Composites. The Minerals, Metals & Materials Series. 2021; ():29-36.
Chicago/Turabian StyleFabio Da Costa Garcia Filho; Michelle Souza Oliveira; Fernanda Santos da Luz; Sergio Neves Monteiro. 2021. "Influence of Graphene Oxide Functionalization Strategy on the Dynamic Mechanical Response of Natural Fiber Reinforced Polymer Matrix Composites." The Minerals, Metals & Materials Series , no. : 29-36.
Novel conjugated random and block terpolymers composed of two electron-donating blocks - fluorene (Flo) and carbazole (Cz) - as well as one electron-accepting unit of thiophene-benzothiadiazole-thiophene (TBT) with the same (Flo:TBT:Cz) molar ratio of 0.5:1:0.5 were synthesized. The effects of their microstructure on physico-chemical properties and the performance of photovoltaic conversion were characterized. These conjugated terpolymers displayed two absorption peaks in UV–Vis analysis around 400 and 600 nm with a similar and narrow bandgap (1.9 eV, UV–Vis film), which is suitable to be applied as p-type semiconductors in an organic solar cell (OSC). Both synthesized terpolymers presented a high average molecular weight and degradation temperature above 400 °C. OSCs were assembled for determining the power conversion efficiency (PCE). Block terpolymer with a PCE of 1.3%, higher than that of 0.9% for the random terpolymer, was used as the electron donor in a conventional cell configuration. The device's optimization improved the photovoltaic parameters, mainly the short circuit current density, which allowed a PCE of 3.2% to be achieved. These results demonstrate that the synthesis of block terpolymers is a simple and practical approach for optimizing a conjugated polymer for an efficient OSC.
Bianca Pedroso Silva Santos; Allan Bastos Lima; Francineide Lopes de Araújo; Isabela Custódio Mota; Arthur De Castro Ribeiro; Ana Flávia Nogueira; José Geraldo De Melo Furtado; Fabio Da Costa Garcia Filho; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. Synthesis of novel low bandgap random and block terpolymers with improved performance in organic solar cells. Journal of Materials Research and Technology 2020, 10, 51 -65.
AMA StyleBianca Pedroso Silva Santos, Allan Bastos Lima, Francineide Lopes de Araújo, Isabela Custódio Mota, Arthur De Castro Ribeiro, Ana Flávia Nogueira, José Geraldo De Melo Furtado, Fabio Da Costa Garcia Filho, Maria De Fátima Vieira Marques, Sergio Neves Monteiro. Synthesis of novel low bandgap random and block terpolymers with improved performance in organic solar cells. Journal of Materials Research and Technology. 2020; 10 ():51-65.
Chicago/Turabian StyleBianca Pedroso Silva Santos; Allan Bastos Lima; Francineide Lopes de Araújo; Isabela Custódio Mota; Arthur De Castro Ribeiro; Ana Flávia Nogueira; José Geraldo De Melo Furtado; Fabio Da Costa Garcia Filho; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. 2020. "Synthesis of novel low bandgap random and block terpolymers with improved performance in organic solar cells." Journal of Materials Research and Technology 10, no. : 51-65.
The brown pelican (Pelecanus occidentalis) wields one of the largest bills of any bird and is distinguished by the deployable throat pouch of extensible tissue used to capture prey. Here we report on mechanical properties and microstructure of the pouch skin. It exhibits significant anisotropy, with the transverse direction having maximum nominal tensile strains of 200% to 300%, triple the value in the longitudinal direction. This is a higher extensibility than most conventional skin and is the result of the requirement of the sac to net fish; it should expand laterally, with controlled longitudinal stretch. Transmission electron microscopy provides microstructural evidence of the directionality of the collagen fibers and reveals the individual collagen fibrils with a bimodal diameter distribution having peaks at 100 and 170 nm. These dimensions are similar to collagen in mammal skin. In the lateral direction, the fibers form a curvy pattern with a radius of approximately 2 µm wherein the fibrils reorient, straighten, slide, and stretch elastically under tensile load. A second mechanism operates in the transverse direction; the membrane forms a corrugated pattern that, upon straightening of collagen fibrils, confers additional extensibility. This elicits the anisotropic response observed in tensile testing. This work focuses on the mechanical characterization based on the effect of relative bird age, sample location on the pouch, and strain rate. Anterior-posterior location and strain rate are not major influencers on exhibited strengths and extensibilities. However, bird age and dorsal-ventral location are found to affect the mechanical response of the pouch significantly. A physically-based constitutive model is developed for the middle layer of the gular sac, based on observations, which predicts maximum stresses, strains, and the shape of the stress-strain curve consistent with the experimental results.
Seth Dike; Wen Yang; Andrei Pissarenko; Haocheng Quan; Fabio C. Garcia Filho; Robert O. Ritchie; Marc A. Meyers. On the gular sac tissue of the brown pelican: Structural characterization and mechanical properties. Acta Biomaterialia 2020, 118, 161 -181.
AMA StyleSeth Dike, Wen Yang, Andrei Pissarenko, Haocheng Quan, Fabio C. Garcia Filho, Robert O. Ritchie, Marc A. Meyers. On the gular sac tissue of the brown pelican: Structural characterization and mechanical properties. Acta Biomaterialia. 2020; 118 ():161-181.
Chicago/Turabian StyleSeth Dike; Wen Yang; Andrei Pissarenko; Haocheng Quan; Fabio C. Garcia Filho; Robert O. Ritchie; Marc A. Meyers. 2020. "On the gular sac tissue of the brown pelican: Structural characterization and mechanical properties." Acta Biomaterialia 118, no. : 161-181.
In the present work, two types of composites were produced, both reinforced with 30 vol% of curaua fibers (CF). In the first type, only the fiber was functionalized with graphene oxide (GO), producing the GOCF/EM composite. While in the second, only the epoxy matrix (EM) was functionalized, producing the CF/GOEM composite. The objective of the work was to investigate the influence of functionalization with GO on the tensile properties of these produced composites. In comparison with the non GO-functionalized composite, as control CF/EM, the results revealed an increase in yield strength (64%), tensile strength (40%), Young's modulus (60%) and toughness (28%) of the CF/GOEM composite. The GOCF/EM composites for which the fibers were functionalized with GO also performed better than the CF/EM composite. The ANOVA and Tukey tests confirm this increase. As for ductility, within the standard deviation, no change was observed between samples functionalized by GO and those from the control. For the first time, comparing the results of the composites, it was demonstrated that a polymer matrix functionalized by GO offers superior tensile performance compared to the other types, keeping the same GO concentration in the composite. This fact is corroborated by the analysis of the corresponding fracture mechanisms. Preliminary results of composite with simultaneous functionalization of both fiber and epoxy matrix failed to present superior properties. This might be attributed to high amount of GO, which is apparently not a good reinforcement as the curaua fiber.
Ulisses Oliveira Costa; Lucio Fabio Cassiano Nascimento; Julianna Magalhães Garcia; Wendell Bruno Almeida Bezerra; Garcia Filho Fabio da Costa; Fernanda Santos da Luz; Wagner Anacleto Pinheiro; Sergio Neves Monteiro. Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement. Journal of Materials Research and Technology 2020, 9, 13390 -13401.
AMA StyleUlisses Oliveira Costa, Lucio Fabio Cassiano Nascimento, Julianna Magalhães Garcia, Wendell Bruno Almeida Bezerra, Garcia Filho Fabio da Costa, Fernanda Santos da Luz, Wagner Anacleto Pinheiro, Sergio Neves Monteiro. Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement. Journal of Materials Research and Technology. 2020; 9 (6):13390-13401.
Chicago/Turabian StyleUlisses Oliveira Costa; Lucio Fabio Cassiano Nascimento; Julianna Magalhães Garcia; Wendell Bruno Almeida Bezerra; Garcia Filho Fabio da Costa; Fernanda Santos da Luz; Wagner Anacleto Pinheiro; Sergio Neves Monteiro. 2020. "Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement." Journal of Materials Research and Technology 9, no. 6: 13390-13401.
The replacement of synthetic fibers by natural fibers has, in recent decades, been the subject of intense research, particularly as reinforcement of composites. In this work, the lesser known tucum fiber, extracted from the leaves of the Amazon Astrocaryum vulgare palm tree, is investigated as a possible novel reinforcement of epoxy composites. The tucum fiber was characterized by pullout test for interfacial adhesion with epoxy matrix. The fiber presented a critical length of 6.30 mm, with interfacial shear strength of 2.73 MPa. Composites prepared with different volume fractions of 20 and 40% tucum fiber were characterized by tensile and Izod impact tests, as well as by ballistic impact energy absorption using .22 ammunition. A cost analysis compared the tucum fiber epoxy composites with other natural and synthetic fiber reinforced epoxy composites. The results showed that 40 vol% tucum fiber epoxy composites increased the tensile strength by 104% and the absorbed Izod impact energy by 157% in comparison to the plain epoxy, while the ballistic performance of the 20 vol% tucum fiber composites increased 150%. These results confirmed for the first time a reinforcement effect of the tucum fiber to polymer composites. Moreover, these composites exhibit superior cost effectiveness, taking into account a comparison made with others epoxy polymer composites.
Michelle Souza Oliveira; Fernanda Santos Da Luz; Andressa Teixeira Souza; Luana Cristyne Da Cruz Demosthenes; Artur Camposo Pereira; Fabio Da Costa Garcia Filho; Fábio De Oliveira Braga; André Ben-Hur Da Silva Figueiredo; Sergio Neves Monteiro. Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites. Polymers 2020, 12, 2259 .
AMA StyleMichelle Souza Oliveira, Fernanda Santos Da Luz, Andressa Teixeira Souza, Luana Cristyne Da Cruz Demosthenes, Artur Camposo Pereira, Fabio Da Costa Garcia Filho, Fábio De Oliveira Braga, André Ben-Hur Da Silva Figueiredo, Sergio Neves Monteiro. Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites. Polymers. 2020; 12 (10):2259.
Chicago/Turabian StyleMichelle Souza Oliveira; Fernanda Santos Da Luz; Andressa Teixeira Souza; Luana Cristyne Da Cruz Demosthenes; Artur Camposo Pereira; Fabio Da Costa Garcia Filho; Fábio De Oliveira Braga; André Ben-Hur Da Silva Figueiredo; Sergio Neves Monteiro. 2020. "Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites." Polymers 12, no. 10: 2259.
A basic characterization of novel epoxy matrix composites incorporated with up to 40 vol% of processed leaf fibers from the Copernicia prunifera palm tree, known as carnauba fibers, was performed. The tensile properties for the composite reinforced with 40 vol% of carnauba fibers showed an increase (40%) in the tensile strength and (69%) for the elastic modulus. All composites presented superior elongation values in comparison to neat epoxy. Izod impact tests complemented by fibers/matrix interfacial strength evaluation by pullout test and Fourier transformed infrared (FTIR) analysis revealed for the first time a significant reinforcement effect (> 9 times) caused by the carnauba fiber to polymer matrix. Additional thermogravimetric analysis (TG/DTG) showed the onset of thermal degradation for the composites (326 ~ 306 °C), which represents a better thermal stability than the plain carnauba fiber (267 °C) but slightly lower than that of the neat epoxy (342 °C). Differential scanning calorimetry (DSC) disclosed an endothermic peak at 63 °C for the neat epoxy associated with the glass transition temperature (Tg). DSC endothermic peaks for the composites, between 73 to 103 °C, and for the plain carnauba fibers, 107 °C, are attributed to moisture release. Dynamic mechanical analysis confirms Tg of 64 °C for the neat epoxy and slightly higher composite values (82–84 °C) due to the carnauba fiber interference with the epoxy macromolecular chain mobility. Both by its higher impact resistance and thermal behavior, the novel carnauba fibers epoxy composites might be considered a viable substitute for commonly used glass fiber composites.
Raí Felipe Pereira Junio; Lucio Fabio Cassiano Nascimento; Lucas De Mendonça Neuba; Andressa Teixeira Souza; João Victor Barbosa Moura; Fábio Da Costa Garcia Filho; Sergio Neves Monteiro. Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites. Polymers 2020, 12, 2090 .
AMA StyleRaí Felipe Pereira Junio, Lucio Fabio Cassiano Nascimento, Lucas De Mendonça Neuba, Andressa Teixeira Souza, João Victor Barbosa Moura, Fábio Da Costa Garcia Filho, Sergio Neves Monteiro. Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites. Polymers. 2020; 12 (9):2090.
Chicago/Turabian StyleRaí Felipe Pereira Junio; Lucio Fabio Cassiano Nascimento; Lucas De Mendonça Neuba; Andressa Teixeira Souza; João Victor Barbosa Moura; Fábio Da Costa Garcia Filho; Sergio Neves Monteiro. 2020. "Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites." Polymers 12, no. 9: 2090.
Natural-fiber-reinforced polymer composites have recently drawn attention as new materials for ballistic armor due to sustainability benefits and lower cost as compared to conventional synthetic fibers, such as aramid and ultra-high-molecular-weight polyethylene (UHMWPE). In the present work, a comparison was carried out between the ballistic performance of UHMWPE composite, commercially known as Dyneema, and epoxy composite reinforced with 30 vol % natural fibers extracted from pineapple leaves (PALF) in a hard armor system. This hard armor system aims to provide additional protection to conventional level IIIA ballistic armor vests, made with Kevlar, by introducing the PALF composite plate, effectively changing the ballistic armor into level III. This level of protection allows the ballistic armor to be safely subjected to higher impact projectiles, such as 7.62 mm caliber rifle ammunition. The results indicate that a hard armor with a ceramic front followed by the PALF/epoxy composite meets the National Institute of Justice (NIJ) international standard for level III protection and performs comparably to that of the Dyneema plate, commonly used in armor vests.
Fernanda Santos Da Luz; Fabio Da Costa Garcia Filho; Michelle Souza Oliveira; Lucio Fabio Cassiano Nascimento; Sergio Neves Monteiro. Composites with Natural Fibers and Conventional Materials Applied in a Hard Armor: A Comparison. Polymers 2020, 12, 1920 .
AMA StyleFernanda Santos Da Luz, Fabio Da Costa Garcia Filho, Michelle Souza Oliveira, Lucio Fabio Cassiano Nascimento, Sergio Neves Monteiro. Composites with Natural Fibers and Conventional Materials Applied in a Hard Armor: A Comparison. Polymers. 2020; 12 (9):1920.
Chicago/Turabian StyleFernanda Santos Da Luz; Fabio Da Costa Garcia Filho; Michelle Souza Oliveira; Lucio Fabio Cassiano Nascimento; Sergio Neves Monteiro. 2020. "Composites with Natural Fibers and Conventional Materials Applied in a Hard Armor: A Comparison." Polymers 12, no. 9: 1920.
Composites reinforced with natural lignocellulosic fibers (NLFs) are gaining relevance as the worldwide demand for renewable and sustainable materials increases. To develop novel natural composites with satisfactory properties, less common NLFs should also be investigated. Among these, the Cyperus malaccensis (CM), a type of sedge fiber, is already used in simple items like ropes, furniture, and paper, but has not yet been investigated as composite reinforcement for possible engineering applications. Therefore, the present work evaluated for the first time the properties of novel epoxy composites incorporated with 10, 20, and 30 vol.% of CM sedge fibers. Tensile, Izod-impact, and ballistic impact tests were performed, as well as Fourier transform infrared (FT-IR) spectroscopy and thermal analysis of the composites. Results disclosed a decrease (−55%) in tensile strengths as compared to the neat epoxy. However, the elastic modulus of the 30 vol.% sedge fiber composite increased (+127%). The total strain and absorbed ballistic energy did not show significant variation. The Izod impact energy of the 30 vol.% composite was found to be 181% higher than the values obtained for the neat epoxy as a control sample. An increase in both stiffness and toughness characterized a reinforcement effect of the sedge fiber. The thermal analysis revealed a slight decrease (−15%) in the degradation temperature of the CM sedge fiber composites compared to the neat epoxy. The glass-transition temperatures were determined to be in the range of 67 to 81 °C.
Lucas De Mendonça Neuba; Raí Felipe Pereira Junio; Matheus Pereira Ribeiro; Andressa Teixeira Souza; Eduardo De Sousa Lima; Fábio Da Costa Garcia Filho; André Ben-Hur Da Silva Figueiredo; Fábio De Oliveira Braga; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro. Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber. Polymers 2020, 12, 1776 .
AMA StyleLucas De Mendonça Neuba, Raí Felipe Pereira Junio, Matheus Pereira Ribeiro, Andressa Teixeira Souza, Eduardo De Sousa Lima, Fábio Da Costa Garcia Filho, André Ben-Hur Da Silva Figueiredo, Fábio De Oliveira Braga, Afonso Rangel Garcez De Azevedo, Sergio Neves Monteiro. Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber. Polymers. 2020; 12 (8):1776.
Chicago/Turabian StyleLucas De Mendonça Neuba; Raí Felipe Pereira Junio; Matheus Pereira Ribeiro; Andressa Teixeira Souza; Eduardo De Sousa Lima; Fábio Da Costa Garcia Filho; André Ben-Hur Da Silva Figueiredo; Fábio De Oliveira Braga; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro. 2020. "Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber." Polymers 12, no. 8: 1776.
A novel class of graphene-based materials incorporated into natural lignocellulosic fiber (NLF) polymer composites is surging since 2011. The present overview is the first attempt to compile achievements regarding this novel class of composites both in terms of technical and scientific researches as well as development of innovative products. A brief description of the graphene nature and its recent isolation from graphite is initially presented together with the processing of its main derivatives. In particular, graphene-based materials, such as nanographene (NG), exfoliated graphene/graphite nanoplatelet (GNP), graphene oxide (GO) and reduced graphene oxide (rGO), as well as other carbon-based nanomaterials, such as carbon nanotube (CNT), are effectively being incorporated into NLF composites. Their disclosed superior mechanical, thermal, electrical, and ballistic properties are discussed in specific publications. Interfacial shear strength of 575 MPa and tensile strength of 379 MPa were attained in 1 wt % GO-jute fiber and 0.75 wt % jute fiber, respectively, epoxy composites. Moreover, a Young’s modulus of 44.4 GPa was reported for 0.75 wt % GO-jute fiber composite. An important point of interest concerning this incorporation is the fact that the amphiphilic character of graphene allows a better way to enhance the interfacial adhesion between hydrophilic NLF and hydrophobic polymer matrix. As indicated in this overview, two basic incorporation strategies have so far been adopted. In the first, NG, GNP, GO, rGO and CNT are used as hybrid filler together with NLF to reinforce polymer composites. The second one starts with GO or rGO as a coating to functionalize molecular bonding with NLF, which is then added into a polymeric matrix. Both strategies are contributing to develop innovative products for energy storage, drug release, biosensor, functional electronic clothes, medical implants, and armor for ballistic protection. As such, this first overview intends to provide a critical assessment of a surging class of composite materials and unveil successful development associated with graphene incorporated NLF polymer composites.
Fernanda Santos Da Luz; Fabio Da Costa Garcia Filho; Maria Teresa Gómez Del-Río; Lucio Fabio Cassiano Nascimento; Wagner Anacleto Pinheiro; Sergio Neves Monteiro. Graphene-Incorporated Natural Fiber Polymer Composites: A First Overview. Polymers 2020, 12, 1601 .
AMA StyleFernanda Santos Da Luz, Fabio Da Costa Garcia Filho, Maria Teresa Gómez Del-Río, Lucio Fabio Cassiano Nascimento, Wagner Anacleto Pinheiro, Sergio Neves Monteiro. Graphene-Incorporated Natural Fiber Polymer Composites: A First Overview. Polymers. 2020; 12 (7):1601.
Chicago/Turabian StyleFernanda Santos Da Luz; Fabio Da Costa Garcia Filho; Maria Teresa Gómez Del-Río; Lucio Fabio Cassiano Nascimento; Wagner Anacleto Pinheiro; Sergio Neves Monteiro. 2020. "Graphene-Incorporated Natural Fiber Polymer Composites: A First Overview." Polymers 12, no. 7: 1601.
In this work, high levels of wood residue were incorporated into high density polyethylene (HDPE). The composite processing was carried out in a twin screw extruder. Due to the large amount of solid charge, adaptation of the equipment was necessary. Wood polymer composites (WPCs) with 60, 65 and 70% wood residue were obtained. In order to use composites in applications such as profiles for application on floors, an analysis of the fatigue strength of the composites was performed, as well as the water absorption capacity. The effect of ultra violet (UV) radiation on the surface of the composites was also evaluated using simulation in a degradation chamber. There was a significant increase in the stiffness of the composites and a reduction in flexural strength. Due to the large amount of load, formation of agglomerates was observed, which reduced the impact resistance. In spite of the use of compatibilizers, it was observed a weak adhesion between the phases, which impaired in the number of cycles under fatigue. When subjected to UV-degradation, the materials exhibited a small reduction in tensile strength. In general, the results indicate that the developed WPCs, considering applications in floors, presented some suitable properties such as rigidity and flexural strength, however, the processing conditions must be adequate for greater interaction between the phases.
Josiane Dantas Viana Barbos; Joyce Batista Azevedo; Pollyana Da Silva M. Cardoso; Fabio Da Costa Garcia Filho; Teresa Gómez del Río. Development and characterization of WPCs produced with high amount of wood residue. Journal of Materials Research and Technology 2020, 9, 9684 -9690.
AMA StyleJosiane Dantas Viana Barbos, Joyce Batista Azevedo, Pollyana Da Silva M. Cardoso, Fabio Da Costa Garcia Filho, Teresa Gómez del Río. Development and characterization of WPCs produced with high amount of wood residue. Journal of Materials Research and Technology. 2020; 9 (5):9684-9690.
Chicago/Turabian StyleJosiane Dantas Viana Barbos; Joyce Batista Azevedo; Pollyana Da Silva M. Cardoso; Fabio Da Costa Garcia Filho; Teresa Gómez del Río. 2020. "Development and characterization of WPCs produced with high amount of wood residue." Journal of Materials Research and Technology 9, no. 5: 9684-9690.
Natural lignocellulosic fibers and corresponding fabrics have been gaining notoriety in recent decades as reinforcement options for polymer matrices associated with industrially applied composites. These natural fibers and fabrics exhibit competitive properties when compared with some synthetics such as glass fiber. In particular, the use of fabrics made from natural fibers might be considered a more efficient alternative, since they provide multidirectional reinforcement and allow the introduction of a larger volume fraction of fibers in the composite. In this context, it is important to understand the mechanical performance of natural fabric composites as a basic condition to ensure efficient engineering applications. Therefore, it is also important to recognize that ramie fiber exhibiting superior strength can be woven into fabric, but is the least investigated as reinforcement in strong, tough polymers to obtain tougher polymeric composites. Accordingly, this paper presents the preparation of epoxy composite containing 30 vol.% Boehmeria nivea fabric by vacuum-assisted resin infusion molding technique and mechanical behavior characterization of the prepared composite. Obtained results are explained based on the fractography studies of tested samples.
Fabio Da Costa Garcia Filho; Fernanda Santos Da Luz; Lucio Fabio Cassiano Nascimento; Kestur Gundappa Satyanarayana; Jaroslaw Wieslaw Drelich; Sergio Neves Monteiro. Mechanical Properties of Boehmeria nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared by Vacuum-Assisted Resin Infusion Molding. Polymers 2020, 12, 1311 .
AMA StyleFabio Da Costa Garcia Filho, Fernanda Santos Da Luz, Lucio Fabio Cassiano Nascimento, Kestur Gundappa Satyanarayana, Jaroslaw Wieslaw Drelich, Sergio Neves Monteiro. Mechanical Properties of Boehmeria nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared by Vacuum-Assisted Resin Infusion Molding. Polymers. 2020; 12 (6):1311.
Chicago/Turabian StyleFabio Da Costa Garcia Filho; Fernanda Santos Da Luz; Lucio Fabio Cassiano Nascimento; Kestur Gundappa Satyanarayana; Jaroslaw Wieslaw Drelich; Sergio Neves Monteiro. 2020. "Mechanical Properties of Boehmeria nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared by Vacuum-Assisted Resin Infusion Molding." Polymers 12, no. 6: 1311.
Talita Gama Sousa; Isaque Alan De Brito Moura; Fabio Da Costa Garcia Filho; Sergio Neves Monteiro; Luiz Paulo Brandão. Combining severe plastic deformation and precipitation to enhance mechanical strength and electrical conductivity of Cu–0.65Cr–0.08Zr alloy. Journal of Materials Research and Technology 2020, 9, 5953 -5961.
AMA StyleTalita Gama Sousa, Isaque Alan De Brito Moura, Fabio Da Costa Garcia Filho, Sergio Neves Monteiro, Luiz Paulo Brandão. Combining severe plastic deformation and precipitation to enhance mechanical strength and electrical conductivity of Cu–0.65Cr–0.08Zr alloy. Journal of Materials Research and Technology. 2020; 9 (3):5953-5961.
Chicago/Turabian StyleTalita Gama Sousa; Isaque Alan De Brito Moura; Fabio Da Costa Garcia Filho; Sergio Neves Monteiro; Luiz Paulo Brandão. 2020. "Combining severe plastic deformation and precipitation to enhance mechanical strength and electrical conductivity of Cu–0.65Cr–0.08Zr alloy." Journal of Materials Research and Technology 9, no. 3: 5953-5961.
High entropy alloys (HEAs) emerged in the beginning of XXI century as novel materials to “keep-an-eye-on”. In fact, nowadays, 16 years after they were first mentioned, a lot of research has been done regarding the properties, microstructure, and production techniques for the HEAs. Moreover, outstanding properties and possibilities have been reported for such alloys. However, a way of jointing these materials should be considered in order to make such materials suitable for engineering applications. Welding is one of the most common ways of jointing materials for engineering applications. Nevertheless, few studies concerns on efforts of welding HEAs. Therefore, it is mandatory to increase the investigation regarding the weldability of HEAs. This work aims to present a short review about what have been done in recent years, and what are the most common welding techniques that are used for HEAs. It also explores what are the measured properties of welded HEAs as well as what are the main challenges that researchers have been facing. Finally, it gives a future perspective for this research field.
Fabio C. Garcia Filho; Sergio N. Monteiro. Welding Joints in High Entropy Alloys: A Short-Review on Recent Trends. Materials 2020, 13, 1411 .
AMA StyleFabio C. Garcia Filho, Sergio N. Monteiro. Welding Joints in High Entropy Alloys: A Short-Review on Recent Trends. Materials. 2020; 13 (6):1411.
Chicago/Turabian StyleFabio C. Garcia Filho; Sergio N. Monteiro. 2020. "Welding Joints in High Entropy Alloys: A Short-Review on Recent Trends." Materials 13, no. 6: 1411.
The arapaima is a large Amazonian freshwater fish and an example of a natural protective system against predators such as the piranha fish. In this work, both the plain scales and a 30 vol% of arapaima scales reinforced epoxy composite were characterized for their structure, composition and morphology. The characterization was performed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). The SEM images showed that the surface morphology of the scales was not altered by the flattening process applied before composite manufacturing. The EDS results confirm that the percentage of calcium is higher in the scale outer layer, which also shows the presence of phosphorous. The evidence of collagens in the plain scales as well as the presence of hydroxyl groups and absorption bands related to the epoxy group in the composites were revealed by FTIR. Mechanical bend tests disclosed the toughening contribution of arapaima scales to the composite epoxy matrix. Nanoindentation testing confirms the higher hardness of the scale outer layer associated with calcium participation. These experimental results provide, for the first time, an initial view of the arapaima scales potential for use as reinforcement in novel polymer composites.
Wendell Bruno Almeida Bezerra; Sergio Neves Monteiro; Michelle Souza Oliveira; Fernanda Santos da Luz; Fabio Da Costa Garcia Filho; Luana Cristyne Da Cruz Demosthenes; Ulisses Oliveira Costa. Processing and characterization of Arapaima gigas scales and their reinforced epoxy composites. Journal of Materials Research and Technology 2020, 9, 3005 -3012.
AMA StyleWendell Bruno Almeida Bezerra, Sergio Neves Monteiro, Michelle Souza Oliveira, Fernanda Santos da Luz, Fabio Da Costa Garcia Filho, Luana Cristyne Da Cruz Demosthenes, Ulisses Oliveira Costa. Processing and characterization of Arapaima gigas scales and their reinforced epoxy composites. Journal of Materials Research and Technology. 2020; 9 (3):3005-3012.
Chicago/Turabian StyleWendell Bruno Almeida Bezerra; Sergio Neves Monteiro; Michelle Souza Oliveira; Fernanda Santos da Luz; Fabio Da Costa Garcia Filho; Luana Cristyne Da Cruz Demosthenes; Ulisses Oliveira Costa. 2020. "Processing and characterization of Arapaima gigas scales and their reinforced epoxy composites." Journal of Materials Research and Technology 9, no. 3: 3005-3012.
Engineering applications involving polymer composites reinforced with natural lignocellulosic fibers (NLFs) have greatly increased in recent decades due to advantages associated not only with favorable composite properties but also fiber sustainability and cost-effectiveness. A search for less common NLFs is currently an endeavor for the development of novel composites with improved properties. In particular, for applications above room temperature, the thermal resistance must be characterize. In the present work composites reinforced with up to 30 vol% fabric made of buriti, a relatively unknown natural fiber from Brazil, with limited reported information, were characterized by thermogravimetric/derivative (TG/DTG) and dynamic mechanical analysis (DMA). Preliminarily, the plain buriti fiber was investigated in terms of X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR) and TG/DTG analysis. XRD pattern allowed, for the first time, the evaluation of a microfibril angle of 7° and crystallinity index of 63%. FTIR bands for buriti fibers were also obtained with expected results. TG/DTG results indicate for the buriti fiber a limit degradation temperature around 200 °C and for the buriti fabric epoxy composites at about 250 °C. Dynamic mechanical analysis of composites disclosed similar viscoelastic stiffness values but an increasing glass transition temperature with the amount of buriti fabric.
Luana Cristyne Da Cruz Demosthenes; Lucio Fabio Cassiano Nascimento; Sergio Neves Monteiro; Ulisses Oliveira Costa; Fabio Da Costa Garcia Filho; Fernanda Santos da Luz; Michelle Souza Oliveira; Flavio James Humberto Tommasini Vieira Ramos; Artur Camposo Pereira; Fábio Oliveira Braga. Thermal and structural characterization of buriti fibers and their relevance in fabric reinforced composites. Journal of Materials Research and Technology 2020, 9, 115 -123.
AMA StyleLuana Cristyne Da Cruz Demosthenes, Lucio Fabio Cassiano Nascimento, Sergio Neves Monteiro, Ulisses Oliveira Costa, Fabio Da Costa Garcia Filho, Fernanda Santos da Luz, Michelle Souza Oliveira, Flavio James Humberto Tommasini Vieira Ramos, Artur Camposo Pereira, Fábio Oliveira Braga. Thermal and structural characterization of buriti fibers and their relevance in fabric reinforced composites. Journal of Materials Research and Technology. 2020; 9 (1):115-123.
Chicago/Turabian StyleLuana Cristyne Da Cruz Demosthenes; Lucio Fabio Cassiano Nascimento; Sergio Neves Monteiro; Ulisses Oliveira Costa; Fabio Da Costa Garcia Filho; Fernanda Santos da Luz; Michelle Souza Oliveira; Flavio James Humberto Tommasini Vieira Ramos; Artur Camposo Pereira; Fábio Oliveira Braga. 2020. "Thermal and structural characterization of buriti fibers and their relevance in fabric reinforced composites." Journal of Materials Research and Technology 9, no. 1: 115-123.
In the aluminum industry, the initial operation comprises the production of its oxide, Al2O3 (alumina) from ores, mainly the bauxite. The Bayer process is, in practice, the only used to produce alumina generating a huge amount of hazardous waste known as red mud. Among the proposed alternatives to consider red mud a useful by-product, the incorporation into clay ceramics allows large quantities to be reutilized as construction products. Several research works investigated this alternative but were limited to single clay incorporation without specific application in building construction products. In the present work the possibility of producing bricks and roofing tiles for building construction with plain red mud and incorporations separately, in two different clays, with low and high plasticity, was for the first time investigated. Both red mud and clays were characterized. Corresponding ceramics fired at 850, 950 and 1050°C were evaluated for their technological properties. The results indicated that plain red mud fired at any of these temperatures might be used as bricks according to the Brazilian standards. It could also be used for roofing tiles production when fired at 1050°C. Application in bricks for building construction and a preliminary environmental assessment were for the first time presented.
Michelle Pereira Babisk; Lucas Fonseca Amaral; Larissa Da Silva Ribeiro; Carlos Maurício Fontes Vieira; Ulisses Soares Do Prado; Monica Castoldi Borlini Gadioli; Michelle Souza Oliveira; Fernanda Santos da Luz; Sergio Neves Monteiro; Fabio Da Costa Garcia Filho. Evaluation and application of sintered red mud and its incorporated clay ceramics as materials for building construction. Journal of Materials Research and Technology 2019, 9, 2186 -2195.
AMA StyleMichelle Pereira Babisk, Lucas Fonseca Amaral, Larissa Da Silva Ribeiro, Carlos Maurício Fontes Vieira, Ulisses Soares Do Prado, Monica Castoldi Borlini Gadioli, Michelle Souza Oliveira, Fernanda Santos da Luz, Sergio Neves Monteiro, Fabio Da Costa Garcia Filho. Evaluation and application of sintered red mud and its incorporated clay ceramics as materials for building construction. Journal of Materials Research and Technology. 2019; 9 (2):2186-2195.
Chicago/Turabian StyleMichelle Pereira Babisk; Lucas Fonseca Amaral; Larissa Da Silva Ribeiro; Carlos Maurício Fontes Vieira; Ulisses Soares Do Prado; Monica Castoldi Borlini Gadioli; Michelle Souza Oliveira; Fernanda Santos da Luz; Sergio Neves Monteiro; Fabio Da Costa Garcia Filho. 2019. "Evaluation and application of sintered red mud and its incorporated clay ceramics as materials for building construction." Journal of Materials Research and Technology 9, no. 2: 2186-2195.
Dislocation lines are usually observed in thin foil images obtained by transmission electron microscopy (TEM). Based on conventional methods involving stereological relationship and line counting, dislocation densities have been calculated in distinct materials, mostly in plastically deformed metals and alloys. However, under certain plastic deformation conditions, such as those associated with dynamic strain aging (DSA), dislocation arrangements may develop highly compact tangles. Inside DSA dense tangles, the individual identification of lines for stereological counting becomes impracticable. In the present work, two novel methods to estimate dislocation densities in highly compact tangles are proposed. The first method is exemplified in TEM images of cells and banded walls substructure of an austenitic stainless steel plastically deformed under DSA condition. In a second method, the average dislocation density of such TEM images is proposed to be calculated by the proportional sum of area fractions multiplied by corresponding dislocation densities of visible dislocation and highly compact tangle areas as well as dislocation-free area.
Sergio Neves Monteiro; Luiz Paulo Brandão; Talita Gama de Sousa; Fabio Da Costa Garcia Filho. Novel methods for dislocation density estimation in highly compacted tangles. Journal of Materials Research and Technology 2019, 9, 2072 -2078.
AMA StyleSergio Neves Monteiro, Luiz Paulo Brandão, Talita Gama de Sousa, Fabio Da Costa Garcia Filho. Novel methods for dislocation density estimation in highly compacted tangles. Journal of Materials Research and Technology. 2019; 9 (2):2072-2078.
Chicago/Turabian StyleSergio Neves Monteiro; Luiz Paulo Brandão; Talita Gama de Sousa; Fabio Da Costa Garcia Filho. 2019. "Novel methods for dislocation density estimation in highly compacted tangles." Journal of Materials Research and Technology 9, no. 2: 2072-2078.