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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.
Multilayered armor systems (MAS) with a front ceramic layer backed by a relatively unknown Amazonian guaruman fiber-reinforced (Ischnosiphon koem) epoxy composites, as second layer, were for the first time ballistic tested against the threat of 7.62 mm rifle ammunition. The amount of 30 vol% guaruman fibers was investigated in three distinct configurations: (i) continuous aligned, (ii) 0–90° cross-laid, and (iii) short-cut randomly dispersed. Additionally, single-target ballistic tests were also carried out in the best MAS-performed composite with cross-laid guaruman fibers against .22 caliber ammunition. The results disclosed that all composites as MAS second layer attended the US NIJ standard with corresponding penetration depth of (i) 32.9, (ii) 27.5, and (iii) 29.6 mm smaller than the lethal limit of 44 mm in a clay witness simulating a personal body. However, the continuous aligned guaruman fiber composite lost structural integrity by delamination after the 7.62 projectile impact. By contrast, the composite with cross-laid guaruman fibers kept its integrity for subsequent shootings as recommended by the standard. The single-target tests indicated a relatively higher limit velocity for .22 caliber projectile perforation, 255 m/s, and absorbed energy of 106 J for the cross-laid guaruman fibers, which are superior to corresponding results for other less known natural fiber epoxy composites.
Raphael Reis; Larissa Nunes; Fernanda da Luz; Verônica Candido; Alisson da Silva; Sergio Monteiro. Ballistic Performance of Guaruman Fiber Composites in Multilayered Armor System and as Single Target. Polymers 2021, 13, 1203 .
AMA StyleRaphael Reis, Larissa Nunes, Fernanda da Luz, Verônica Candido, Alisson da Silva, Sergio Monteiro. Ballistic Performance of Guaruman Fiber Composites in Multilayered Armor System and as Single Target. Polymers. 2021; 13 (8):1203.
Chicago/Turabian StyleRaphael Reis; Larissa Nunes; Fernanda da Luz; Verônica Candido; Alisson da Silva; Sergio Monteiro. 2021. "Ballistic Performance of Guaruman Fiber Composites in Multilayered Armor System and as Single Target." Polymers 13, no. 8: 1203.
In recent decades, the unique characteristics of natural fibers have promoted their use as reinforcement in polymeric composites. This is verified in several industrial sectors, from packaging to automotive and civil construction. Among the natural fibers, the raffia fiber extracted from the palm tree Raphia vinifera and introduced in the Amazon region a long time ago; started to be considered for the production of polymeric composites only in recent years. For the first time, the effect of raffia fiber length and its alkali treatment on the mechanical properties of a polymer composite was disclosed. Tensile tests were performed in composites with raffia fibers randomly dispersed into terephthalate-based unsaturated polyester resin. The results showed an increase in the Young’s moduli, confirmed by ANOVA, for the composite with both untreated and alkali-treated fibers in comparison to the plain polyester, which characterizes a stiffening effect. The composites with alkali treated fibers exhibited similar tensile strength values for all lengths; however, their strengths are lower than those for the untreated condition due to a weak raffia fiber/polyester matrix adhesion. Therefore, this work fills the current knowledge gap on raffia fiber incorporation in polyester matrix and valorizes this abundant Brazilian resource, providing additional information towards the use of raffia fiber in polymer composites.
Edwillson Gonçalves De Oliveira Filho; Fernanda Santos Da Luz; Roberto Tetsuo Fujiyama; Alisson Clay Rios Da Silva; Verônica Scarpini Candido; Sergio Neves Monteiro. Effect of Chemical Treatment and Length of Raffia Fiber (Raphia vinifera) on Mechanical Stiffening of Polyester Composites. Polymers 2020, 12, 2899 .
AMA StyleEdwillson Gonçalves De Oliveira Filho, Fernanda Santos Da Luz, Roberto Tetsuo Fujiyama, Alisson Clay Rios Da Silva, Verônica Scarpini Candido, Sergio Neves Monteiro. Effect of Chemical Treatment and Length of Raffia Fiber (Raphia vinifera) on Mechanical Stiffening of Polyester Composites. Polymers. 2020; 12 (12):2899.
Chicago/Turabian StyleEdwillson Gonçalves De Oliveira Filho; Fernanda Santos Da Luz; Roberto Tetsuo Fujiyama; Alisson Clay Rios Da Silva; Verônica Scarpini Candido; Sergio Neves Monteiro. 2020. "Effect of Chemical Treatment and Length of Raffia Fiber (Raphia vinifera) on Mechanical Stiffening of Polyester Composites." Polymers 12, no. 12: 2899.
A growing environmental concern is increasing the search for new sustainable materials. In this scenario, natural lignocellulosic fibers (NLFs) became an important alternative to replace synthetic fibers commonly used as composites reinforcement. In this regard, unknown NLFs such as the caranan fiber (Mauritiella armata) found in South American rain forests revealed promising properties for engineering applications. Thus, for the first time, the present work conducted a technical characterization of caranan fiber-incorporated composites. Epoxy matrix composites with 10, 20 and 30 vol% of continuous and aligned caranan fibers were investigated by tensile tests, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Composites with more than 10% vol of caranan fibers significantly increase the elastic modulus and toughness in comparison to the neat epoxy. Indeed, the composite with 30 vol% was 50% stiffer, 130% tougher, and 100% stronger, which characterized an effective reinforcement. As for the elastic modulus, total strain and tensile toughness, there is a clear tendency of improvement with the amount of caranan fiber. The TGA disclosed the highest onset temperature of degradation (298 °C) with the least mass loss (36.8%) for the 30 vol% caranan fiber composite. It also displayed a higher degradation peak at 334 °C among the studied composites. The lowest glass transition temperature of 63 °C was obtained by DSC, while the highest of 113 °C by dynamic mechanical analysis (DMA) for the 30 vol% caranan composite. These basic technical findings emphasize the caranan fiber potential as reinforcement for polymer composites.
Andressa Teixeira Souza; Raí Felipe Pereira Junio; Lucas De Mendonça Neuba; Verônica Scarpini Candido; Alisson Clay Rios Da Silva; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro; Lucio Fabio Cassiano Nascimento. Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites. Polymers 2020, 12, 2037 .
AMA StyleAndressa Teixeira Souza, Raí Felipe Pereira Junio, Lucas De Mendonça Neuba, Verônica Scarpini Candido, Alisson Clay Rios Da Silva, Afonso Rangel Garcez De Azevedo, Sergio Neves Monteiro, Lucio Fabio Cassiano Nascimento. Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites. Polymers. 2020; 12 (9):2037.
Chicago/Turabian StyleAndressa Teixeira Souza; Raí Felipe Pereira Junio; Lucas De Mendonça Neuba; Verônica Scarpini Candido; Alisson Clay Rios Da Silva; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro; Lucio Fabio Cassiano Nascimento. 2020. "Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites." Polymers 12, no. 9: 2037.
RESUMO Neste trabalho o objetivo foi caracterizar e estudar o comportamento tecnológico de dois tipos de argilas oriundas da região de São Miguel do Guamá-Pará (norte do Brasil) a partir de formulação argilosa. Foram testadas formulações compostas pela mistura e sem mistura de Argila Forte e Fraca. As matérias-primas foram submetidas a ensaios de DRX, FRX e MEV e peneiramento e sedimentação. Elaborou-se corpos de prova dos quais foram prensados uniaxialmente em matriz retangular metálica. As propriedades físicas e tecnológicas determinadas foram: Absorção de água, porosidade aparente, massa específica aparente, retração linear de queima e resistência à flexão em três pontos. A microestrutura das cerâmicas foi avaliada por MEV e DRX. Os resultados indicaram que as argilas possuem características favoráveis para produção de blocos de vedação, mostrando que a melhor composição ficou com a mistura de 70% de argila fraca mais 30% de argila forte (M4).
Lêda De Azevedo Racanelli; Verônica Scarpini Cândido; José Antônio Da Silva Souza; Dilson Nazareno Cardoso. Caracterização e Estudo das Propriedades Físicas, Químicas e Mecânicas das Argilas Cauliníticas da Região Nordeste do Estado do Pará. Matéria (Rio de Janeiro) 2020, 25, 1 .
AMA StyleLêda De Azevedo Racanelli, Verônica Scarpini Cândido, José Antônio Da Silva Souza, Dilson Nazareno Cardoso. Caracterização e Estudo das Propriedades Físicas, Químicas e Mecânicas das Argilas Cauliníticas da Região Nordeste do Estado do Pará. Matéria (Rio de Janeiro). 2020; 25 (1):1.
Chicago/Turabian StyleLêda De Azevedo Racanelli; Verônica Scarpini Cândido; José Antônio Da Silva Souza; Dilson Nazareno Cardoso. 2020. "Caracterização e Estudo das Propriedades Físicas, Químicas e Mecânicas das Argilas Cauliníticas da Região Nordeste do Estado do Pará." Matéria (Rio de Janeiro) 25, no. 1: 1.
Guarumã or guaruman fiber is a viable alternative, compared to the synthetic fiber, as reinforcement in composite. Differentiated properties like mechanical strength, biodegradability, and renewable resource are reasons of interest for the development of materials with this fiber. Guaruman fibers (Ishinosiphon Koern) can be found in the regions of floodplain in large quantities and, therefore, is a potential raw material as natural fiber. In this work, guaruman fibers were analyzed using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results indicated that this fiber showed structures in rectangular forms.
Raphael Henrique Morais Reis; Veronica Scarpini Candido; Larissa Fernandes Nunes; Sergio Neves Monteiro. Chemical and Morphological Characterization of Guaruman Fiber. Proceedings of the International Conference on Martensitic Transformations: Chicago 2019, 107 -113.
AMA StyleRaphael Henrique Morais Reis, Veronica Scarpini Candido, Larissa Fernandes Nunes, Sergio Neves Monteiro. Chemical and Morphological Characterization of Guaruman Fiber. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2019; ():107-113.
Chicago/Turabian StyleRaphael Henrique Morais Reis; Veronica Scarpini Candido; Larissa Fernandes Nunes; Sergio Neves Monteiro. 2019. "Chemical and Morphological Characterization of Guaruman Fiber." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 107-113.
Cements from alkali-activated reactions are unleashing opportunities for the future application of inorganic polymers, known as geopolymers. These materials are eco-friendly, since their manufacturing process does not involve carbon dioxide (CO2) emission and it makes possible the use of industrial waste as raw material. In this work, a geopolymeric cement concrete (GCC) was developed through adequate portions of geopolymer components. Its characteristics were compared with Portland cement concrete (PCC), through the establishment of some parameters of design such as consumption of binders, water/aggregates ratio and cement content. The mechanical performance of these concretes was evaluated with emphasis on the fatigue behavior. The results showed a better fatigue performance of CCG in comparison with PCC in several parameters. Better matrix/aggregate adhesion in the CCG in comparison with PCC was also observed in the microstructural analysis, which may explain its superior fatigue performance.
Verônica Scarpini Cândido; Alisson Clay Rios da Silva; Noan Tonini Simonassi; Eduardo Sousa Lima; Fernanda Santos da Luz; Sergio Neves Monteiro. Mechanical and microstructural characterization of geopolymeric concrete subjected to fatigue. Journal of Materials Research and Technology 2018, 7, 566 -570.
AMA StyleVerônica Scarpini Cândido, Alisson Clay Rios da Silva, Noan Tonini Simonassi, Eduardo Sousa Lima, Fernanda Santos da Luz, Sergio Neves Monteiro. Mechanical and microstructural characterization of geopolymeric concrete subjected to fatigue. Journal of Materials Research and Technology. 2018; 7 (4):566-570.
Chicago/Turabian StyleVerônica Scarpini Cândido; Alisson Clay Rios da Silva; Noan Tonini Simonassi; Eduardo Sousa Lima; Fernanda Santos da Luz; Sergio Neves Monteiro. 2018. "Mechanical and microstructural characterization of geopolymeric concrete subjected to fatigue." Journal of Materials Research and Technology 7, no. 4: 566-570.
This paper aims to present a comparison on the use of different heat treatment conditions in association with welding of a HSLA-80 steel. This investigation was carried out by multipass welding using the coated electrode process in different heat treatment conditions, with or without pre- or post-weld heating, in order to compare effects on the mechanical properties and microstructure for each condition. After welding was performed, procedures to identify microstructural phases and characterize the mechanical behavior were carried out. The results of mechanical tests and metallographic analysis were conclusive that heat treatments are not necessary to complement welding procedures of this steel. This is especially the case of the post-welding heat treatment. In fact, the application of these treatments did not significantly affect neither the microstructure nor the mechanical characteristics of the material.
Leandro De Jesus Jorge; Verônica Scarpini Cândido; Alisson Clay Rios da Silva; Fabio Da Costa Garcia Filho; Artur Camposo Pereira; Fernanda Santos da Luz; Sergio Neves Monteiro. Mechanical properties and microstructure of SMAW welded and thermically treated HSLA-80 steel. Journal of Materials Research and Technology 2018, 7, 598 -605.
AMA StyleLeandro De Jesus Jorge, Verônica Scarpini Cândido, Alisson Clay Rios da Silva, Fabio Da Costa Garcia Filho, Artur Camposo Pereira, Fernanda Santos da Luz, Sergio Neves Monteiro. Mechanical properties and microstructure of SMAW welded and thermically treated HSLA-80 steel. Journal of Materials Research and Technology. 2018; 7 (4):598-605.
Chicago/Turabian StyleLeandro De Jesus Jorge; Verônica Scarpini Cândido; Alisson Clay Rios da Silva; Fabio Da Costa Garcia Filho; Artur Camposo Pereira; Fernanda Santos da Luz; Sergio Neves Monteiro. 2018. "Mechanical properties and microstructure of SMAW welded and thermically treated HSLA-80 steel." Journal of Materials Research and Technology 7, no. 4: 598-605.
High energy consumption and elevated emission of carbon dioxide are relevant problems of the Portland cement industry related to environmental issues. With the purpose of reducing such problems, geopolymerics cements constitute a new class of materials used as mineral binder capable to replace Portland cement owing to technical and environmental advantages. These advantages, particularly the “ecologically friendly” aspect, have been questioned and are currently the subject of research works. As possible applications, geopolymeric cements are known to rapidly develop mechanical strength with aging while maintaining dimensional stability. By also considering the excellent adherence to aggregates make geopolymer cements potential materials for civil construction. Indeed, they are currently being investigated for the production of geopolymeric concrete as possible substitute for Portland cement concrete. In this work a combined comparison between mechanical, thermal and microstructure characteristics of concretes made with geopolymeric and high performance Portland cements is presented. Results of compressive strength, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermal analysis (DSC/TGA) are discussed, in order to gather information for a better understanding of the relation between properties and microstructure of both geopolymeric and Portland cements in the performance of concretes.
Diegles Simoes De Toledo Pereira; Felipe Jose da Silva; Ana Beatriz Rodrigues Porto; Veronica Scarpini Candido; Alisson Clay Rios da Silva; Fabio Da Costa Garcia Filho; Sergio Neves Monteiro. Comparative analysis between properties and microstructures of geopolymeric concrete and portland concrete. Journal of Materials Research and Technology 2018, 7, 606 -611.
AMA StyleDiegles Simoes De Toledo Pereira, Felipe Jose da Silva, Ana Beatriz Rodrigues Porto, Veronica Scarpini Candido, Alisson Clay Rios da Silva, Fabio Da Costa Garcia Filho, Sergio Neves Monteiro. Comparative analysis between properties and microstructures of geopolymeric concrete and portland concrete. Journal of Materials Research and Technology. 2018; 7 (4):606-611.
Chicago/Turabian StyleDiegles Simoes De Toledo Pereira; Felipe Jose da Silva; Ana Beatriz Rodrigues Porto; Veronica Scarpini Candido; Alisson Clay Rios da Silva; Fabio Da Costa Garcia Filho; Sergio Neves Monteiro. 2018. "Comparative analysis between properties and microstructures of geopolymeric concrete and portland concrete." Journal of Materials Research and Technology 7, no. 4: 606-611.
Natural fibers such as those from sugarcane bagasse may be obtained as industrial waste products. These fibers have recently been investigated as low-cost reinforcements in composites for engineering applications, some of which may require exposure to temperatures above ambient. In the present work, fibers extracted from sugarcane bagasse were used at up to 30 vol.% as reinforcement in polyester-matrix composites. The thermal behavior of these composites was investigated by thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG) as well as dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). TGA/DTG results indicated similar limits of thermal stability at about 200°C for the neat polyester and the bagasse fiber composites. The thermal degradation peak at around 370°C was also similar, being attributed mainly to polyester. DSC analysis revealed that bagasse fiber incorporation caused only a minor change in the glass-transition temperature. On the contrary, DMA parameters revealed notable changes attributed to effect of the bagasse fibers on the viscous stiffness and damping capacity of the polyester.
Fernanda Santos Da Luz; Veronica Scarpini Candido; Alisson Clay Rios Da Silva; Sergio Neves Monteiro. Thermal Behavior of Polyester Composites Reinforced with Green Sugarcane Bagasse Fiber. JOM 2018, 70, 1965 -1971.
AMA StyleFernanda Santos Da Luz, Veronica Scarpini Candido, Alisson Clay Rios Da Silva, Sergio Neves Monteiro. Thermal Behavior of Polyester Composites Reinforced with Green Sugarcane Bagasse Fiber. JOM. 2018; 70 (10):1965-1971.
Chicago/Turabian StyleFernanda Santos Da Luz; Veronica Scarpini Candido; Alisson Clay Rios Da Silva; Sergio Neves Monteiro. 2018. "Thermal Behavior of Polyester Composites Reinforced with Green Sugarcane Bagasse Fiber." JOM 70, no. 10: 1965-1971.
Martensitic transformation can be induced by plastic deformation in metastable iron-based alloys, such as stainless steels containing limited amounts of C, Ni and Cr. This transformation takes place at the temperature range from M s and M d , usually at relatively lower temperature values. The transformed martensite has been associated with maximum ultimate strength and relatively high ductility. In the present work, the tensile fracture characteristics of a metastable AISI type 302 stainless steel was properties were compared to those of a stable AISI type 310 austenitic stainless steel. It was found that in 302 steel, its high degree of metastability and dilute dispersion of inclusions result in higher strength and complex modes of fracture, one of which consisting of martensite surrounding globular inclusions. Keywords: AISI type 302 stainless steel; metastable deformation; martensitic transformation; fracture modes
Jheison Lopes Dos Santos; Sergio Neves Monteiro; Veronica Scarpini Candido; Anderson Oliveira da Silva; Flavio James Tommasini. Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation. Materials Research 2017, 20, 596 -602.
AMA StyleJheison Lopes Dos Santos, Sergio Neves Monteiro, Veronica Scarpini Candido, Anderson Oliveira da Silva, Flavio James Tommasini. Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation. Materials Research. 2017; 20 (suppl 2):596-602.
Chicago/Turabian StyleJheison Lopes Dos Santos; Sergio Neves Monteiro; Veronica Scarpini Candido; Anderson Oliveira da Silva; Flavio James Tommasini. 2017. "Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation." Materials Research 20, no. suppl 2: 596-602.
The plastic instability in the stress-strain curve and work hardening of a type AISI 316 austenitic stainless steel was investigated in the high temperature range of 150°C to 800°C for two strain rates. The results indicate the occurrence of plastic instability and serrations between 200°C and 650°C with peaks in both the tensile strength and work hardening rate. These plastic instability/serrations are associated with dynamic strain aging behavior. As a consequence, within the temperature interval of plastic instability, a negative value for the strain rate sensitivity was found. Based on the activation energy, it is proposed that a mechanism of substitutional solute atoms interaction with dislocations be responsible for the plastic instability. Keywords: AISI 316 stainless steel; plastic instability; tensile behavior
Sergio Neves Monteiro; Frederico Muylaert Margem; Veronica Scarpini Candido; André Figueiredo. High Temperature Plastic Instability and Dynamic Strain Aging in the Tensile Behavior of AISI 316 Stainless Steel. Materials Research 2017, 20, 506 -511.
AMA StyleSergio Neves Monteiro, Frederico Muylaert Margem, Veronica Scarpini Candido, André Figueiredo. High Temperature Plastic Instability and Dynamic Strain Aging in the Tensile Behavior of AISI 316 Stainless Steel. Materials Research. 2017; 20 (suppl 2):506-511.
Chicago/Turabian StyleSergio Neves Monteiro; Frederico Muylaert Margem; Veronica Scarpini Candido; André Figueiredo. 2017. "High Temperature Plastic Instability and Dynamic Strain Aging in the Tensile Behavior of AISI 316 Stainless Steel." Materials Research 20, no. suppl 2: 506-511.
The fibers extracted from the sugarcane bagasse have been investigated as possible reinforcement for polymer matrix composites. The use of these composites in engineering applications, associated with conditions such as ballistic armor, requires information on the impact toughness. In the present work, Charpy tests were performed in ASTM standard specimens of polyester matrix composites, reinforced with 10, 20 and 30 vol% of continuous and aligned sugarcane bagasse fibers, in order to evaluate the impact energy. Within the standard deviation, the composite absorbed impact energy increased with the volume fraction of sugarcane bagasse fiber. This toughness performance was found by scanning electron microscopy to be associated with the fiber/matrix delamination. Keywords: Sugarcane bagasse fiber, Polyester composites, Charpy test, Impact toughnes
Veronica Scarpini Candido; Alisson Clay Rios da Silva; Noan Tonini Simonassi; Fernanda Santos da Luz; Sergio Neves Monteiro. Toughness of polyester matrix composites reinforced with sugarcane bagasse fibers evaluated by Charpy impact tests. Journal of Materials Research and Technology 2017, 6, 334 -338.
AMA StyleVeronica Scarpini Candido, Alisson Clay Rios da Silva, Noan Tonini Simonassi, Fernanda Santos da Luz, Sergio Neves Monteiro. Toughness of polyester matrix composites reinforced with sugarcane bagasse fibers evaluated by Charpy impact tests. Journal of Materials Research and Technology. 2017; 6 (4):334-338.
Chicago/Turabian StyleVeronica Scarpini Candido; Alisson Clay Rios da Silva; Noan Tonini Simonassi; Fernanda Santos da Luz; Sergio Neves Monteiro. 2017. "Toughness of polyester matrix composites reinforced with sugarcane bagasse fibers evaluated by Charpy impact tests." Journal of Materials Research and Technology 6, no. 4: 334-338.
The application of natural lignocellulosic fibers (LCFs) in engineering composites has increased interest in their properties and structural characteristics. In particular, the inherent porosity of an LCF markedly affects its density and the adhesion to polymer matrices. For the first time, both open and closed porosities of a natural LCF, for different diameter ranges, were assessed. Fibers extracted from the mesocarp of the coconut fruit were investigated by nondestructive methods of density measurements and x-ray microtomography (microCT). It was found that, for all diameter ranges, the closed porosity is significantly higher than the open porosity. The total porosity increases with diameter to around 60% for coir fibers with more than 503 μm in diameter. The amount and characteristics of these open and closed porosities were revealed by t test and Weibull statistics as well as by microCT.
Fernanda Santos Da Luz; Sidnei Paciornik; Sergio Monteiro; Luiz Carlos Da Silva; Flávio James Tommasini; Veronica Scarpini Candido. Porosity Assessment for Different Diameters of Coir Lignocellulosic Fibers. JOM 2017, 69, 2045 -2051.
AMA StyleFernanda Santos Da Luz, Sidnei Paciornik, Sergio Monteiro, Luiz Carlos Da Silva, Flávio James Tommasini, Veronica Scarpini Candido. Porosity Assessment for Different Diameters of Coir Lignocellulosic Fibers. JOM. 2017; 69 (10):2045-2051.
Chicago/Turabian StyleFernanda Santos Da Luz; Sidnei Paciornik; Sergio Monteiro; Luiz Carlos Da Silva; Flávio James Tommasini; Veronica Scarpini Candido. 2017. "Porosity Assessment for Different Diameters of Coir Lignocellulosic Fibers." JOM 69, no. 10: 2045-2051.
Carlos Maurício F. Vieira; Regina M. Pinheiro; Ruben J. Sanchez Rodriguez; Veronica Scarpini Candido; Sergio N. Monteiro. Clay bricks added with effluent sludge from paper industry: Technical, economical and environmental benefits. Applied Clay Science 2016, 132-133, 753 -759.
AMA StyleCarlos Maurício F. Vieira, Regina M. Pinheiro, Ruben J. Sanchez Rodriguez, Veronica Scarpini Candido, Sergio N. Monteiro. Clay bricks added with effluent sludge from paper industry: Technical, economical and environmental benefits. Applied Clay Science. 2016; 132-133 ():753-759.
Chicago/Turabian StyleCarlos Maurício F. Vieira; Regina M. Pinheiro; Ruben J. Sanchez Rodriguez; Veronica Scarpini Candido; Sergio N. Monteiro. 2016. "Clay bricks added with effluent sludge from paper industry: Technical, economical and environmental benefits." Applied Clay Science 132-133, no. : 753-759.
The domains of the existence of deformation mechanisms in a map associated with phase transformation and mechanical effects related to aging processes were investigated in austenitic stainless steels. It was also discussed the participation of grain boundary sliding, both as an additional deformation mechanism and a damage accumulation process. A prediction analysis for two typical high temperature engineering systems was attempted based on the map information. This prediction indicates the possibility of grain boundary sliding and creep strain jumps to interfere with the expected operational life of components in these systems operating at high temperatures.
Sergio Neves Monteiro; Frederico Muylaert Margem; Lucas Tedesco Bolzan; George Lobo Nobre Fernandes; Verônica Scarpini Cândido. Special Effects in Deformation Mechanism Maps for Austenitic Stainless Steels. Materials Science Forum 2016, 869, 543 -549.
AMA StyleSergio Neves Monteiro, Frederico Muylaert Margem, Lucas Tedesco Bolzan, George Lobo Nobre Fernandes, Verônica Scarpini Cândido. Special Effects in Deformation Mechanism Maps for Austenitic Stainless Steels. Materials Science Forum. 2016; 869 ():543-549.
Chicago/Turabian StyleSergio Neves Monteiro; Frederico Muylaert Margem; Lucas Tedesco Bolzan; George Lobo Nobre Fernandes; Verônica Scarpini Cândido. 2016. "Special Effects in Deformation Mechanism Maps for Austenitic Stainless Steels." Materials Science Forum 869, no. : 543-549.
Dynamic deformation of metals in the elevated strain rate interval of elastic-plastic wave propagation is relevant to technological conditions, such as structural response to impact, ballistic effects, and metal forming processes. In the present work, the work hardening of quasi-static and dynamically deformed copper using a split pressure bar was evaluated for two different grain sizes. From slip lines observations in conditions of both dynamic and quasi-static strain rates, as well as an insensitivity to grain size of the yield stress, it is suggested that copper behave like a single crystal under dynamic deformation. It is shown, for the first time, that the work hardening rate during dynamic deformation of polycrystalline copper remains higher up to the fracture.
Sergio Neves Monteiro; Verônica Scarpini Cândido; Fernanda Santos Da Luz; Jheison Lopes Dos Santos. Work Hardening and Microstructural Effect during Dynamic Deformation of Polycrystalline Copper. Materials Science Forum 2016, 869, 538 -542.
AMA StyleSergio Neves Monteiro, Verônica Scarpini Cândido, Fernanda Santos Da Luz, Jheison Lopes Dos Santos. Work Hardening and Microstructural Effect during Dynamic Deformation of Polycrystalline Copper. Materials Science Forum. 2016; 869 ():538-542.
Chicago/Turabian StyleSergio Neves Monteiro; Verônica Scarpini Cândido; Fernanda Santos Da Luz; Jheison Lopes Dos Santos. 2016. "Work Hardening and Microstructural Effect during Dynamic Deformation of Polycrystalline Copper." Materials Science Forum 869, no. : 538-542.
Alline Sardinha Cordeiro Morais; Carlos Maurício Fontes Vieira; Rubén Jesus Sanchez Rodriguez; Sergio Neves Monteiro; Veronica Scarpini Candido; Carlos Luiz Ferreira. Fluorescent Lamp Glass Waste Incorporation into Clay Ceramic: A Perfect Solution. JOM 2016, 68, 2425 -2434.
AMA StyleAlline Sardinha Cordeiro Morais, Carlos Maurício Fontes Vieira, Rubén Jesus Sanchez Rodriguez, Sergio Neves Monteiro, Veronica Scarpini Candido, Carlos Luiz Ferreira. Fluorescent Lamp Glass Waste Incorporation into Clay Ceramic: A Perfect Solution. JOM. 2016; 68 (9):2425-2434.
Chicago/Turabian StyleAlline Sardinha Cordeiro Morais; Carlos Maurício Fontes Vieira; Rubén Jesus Sanchez Rodriguez; Sergio Neves Monteiro; Veronica Scarpini Candido; Carlos Luiz Ferreira. 2016. "Fluorescent Lamp Glass Waste Incorporation into Clay Ceramic: A Perfect Solution." JOM 68, no. 9: 2425-2434.
The residue obtained from sugarcane juice extraction, in sugar and ethanol production, is known as bagasse. At the industrial mill, bagasse is either incinerated for steam and power generation or discarded as a waste. The incorporation of bagasse waste into polymeric composites for ballistic resistant materials was investigated in this study. Plates of epoxy composites reinforced with either raw bagasse or extracted bagasse fibers were characterized. The 30 vol% bagasse composites were selected as a second layer, backing a front ceramic, in multilayered armors against 7.62 mm ammunition. Ballistic performance of composites was compared to Kevlar™ plates used in commercial multilayered armor systems. Results of ballistic tests indicated that multilayered armors with Kevlar™ and bagasse fiber composites satisfied the National Institute of Justice (NIJ) norm, and displayed similar depths of indentation in a clay witness. By contrast, the armor with raw bagasse composite demonstrated worse performance, with nearly two times deeper indentations, some of which exceeded the NIJ limit. Economical analysis revealed that armor with bagasse fiber composite is nearly 180% less expensive than a corresponding armor with Kevlar™. Therefore, it is shown for the first time that composites reinforced with fibers extracted from sugarcane bagasse (a large scale worldwide generated waste) could replace Kevlar™ in multilayered armor systems making them cheaper and more sustainable.
Sergio Monteiro; Veronica Scarpini Candido; Fabio O. Braga; Lucas T. Bolzan; Ricardo Weber; Jaroslaw W. Drelich. Sugarcane bagasse waste in composites for multilayered armor. European Polymer Journal 2016, 78, 173 -185.
AMA StyleSergio Monteiro, Veronica Scarpini Candido, Fabio O. Braga, Lucas T. Bolzan, Ricardo Weber, Jaroslaw W. Drelich. Sugarcane bagasse waste in composites for multilayered armor. European Polymer Journal. 2016; 78 ():173-185.
Chicago/Turabian StyleSergio Monteiro; Veronica Scarpini Candido; Fabio O. Braga; Lucas T. Bolzan; Ricardo Weber; Jaroslaw W. Drelich. 2016. "Sugarcane bagasse waste in composites for multilayered armor." European Polymer Journal 78, no. : 173-185.
The use of natural resources for sustainable development is becoming a relevant issue in modern societies. In particular, building materials composed of local soil or available residues are considered sustainable solutions for housing construction in relatively small urban areas. In the present work a preliminary study was conducted on a typical soil in the municipal area of Miracema, state of Rio de Janeiro, Brazil. The study comprised the characterization of the particle size distribution and particle density of the soil. In addition, the application of the soil by combining with Portland cement was investigated to produce concrete blocks specified as soil-cement bricks by the Brazilian norm. The results indicated that a trace of 14 parts of soil, 6 parts of local gravel and 4 parts of cement/water produced concrete blocks that comply with the compression strength specified by the norm.
Niander Aguiar Cerqueira; Jonas Alexandre; Afonso Rangel Garcez De Azevedo; Gustavo Xavier; Veronica Scarpini Cândido; Carlos Maurício Fontes Vieira; Sergio Neves Monteiro. Study of a Typical Soil Used for Concrete Bricks in Miracema, State of Rio de Janeiro, Brazil. Materials Science Forum 2015, 820, 40 -45.
AMA StyleNiander Aguiar Cerqueira, Jonas Alexandre, Afonso Rangel Garcez De Azevedo, Gustavo Xavier, Veronica Scarpini Cândido, Carlos Maurício Fontes Vieira, Sergio Neves Monteiro. Study of a Typical Soil Used for Concrete Bricks in Miracema, State of Rio de Janeiro, Brazil. Materials Science Forum. 2015; 820 ():40-45.
Chicago/Turabian StyleNiander Aguiar Cerqueira; Jonas Alexandre; Afonso Rangel Garcez De Azevedo; Gustavo Xavier; Veronica Scarpini Cândido; Carlos Maurício Fontes Vieira; Sergio Neves Monteiro. 2015. "Study of a Typical Soil Used for Concrete Bricks in Miracema, State of Rio de Janeiro, Brazil." Materials Science Forum 820, no. : 40-45.