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Muhammad Ali Nasir
Department of Mechanical Engineering, University of Engineering & Technology Taxila, 47080, Pakistan

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Journal article
Published: 25 May 2021 in Results in Engineering
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Polymer-based composites have an exceptional perspective to replace traditional structural materials like steel and aluminium, owing to their low weight, high strength, and outstanding performance at elevated temperatures. However, the utilization of natural reinforcements for functional polymer composites is still in infancy. In this study, the tensile properties of natural and synthetic fiber-reinforced hybrid composites are reported. Glass-jute hybrid composites, prepared through hand layup technique, were used with different glass and jute fiber stacking sequences. The experimental results stipulate that the tensile properties of glass fiber reinforced polymer (GFRP) were merely affected at lower jute fiber concentration. The strength of composites consisting of single jute fabric lamina and four glass-fiber laminas were comparable with five-laminas GFRP composites. For validation of the experimental tensile testing results, a numerical simulation was also executed. Errors between experimental and numerical simulations were found for different stacking sequences due to non-uniformity in jute fiber diameter and the manufacturing process adopted for these hybrid composites. Fractographic analysis revealed the micro voids and adhesive failure at different joining layers of fibers as the primary cause of delamination.

ACS Style

Muhammad Yasir Khalid; Ans Al Rashid; Zia Ullah Arif; Muhammad Fahad Sheikh; Hassan Arshad; Muhammad Ali Nasir. Tensile strength evaluation of glass/jute fibers reinforced composites: An experimental and numerical approach. Results in Engineering 2021, 10, 100232 .

AMA Style

Muhammad Yasir Khalid, Ans Al Rashid, Zia Ullah Arif, Muhammad Fahad Sheikh, Hassan Arshad, Muhammad Ali Nasir. Tensile strength evaluation of glass/jute fibers reinforced composites: An experimental and numerical approach. Results in Engineering. 2021; 10 ():100232.

Chicago/Turabian Style

Muhammad Yasir Khalid; Ans Al Rashid; Zia Ullah Arif; Muhammad Fahad Sheikh; Hassan Arshad; Muhammad Ali Nasir. 2021. "Tensile strength evaluation of glass/jute fibers reinforced composites: An experimental and numerical approach." Results in Engineering 10, no. : 100232.

Research article
Published: 19 March 2021 in Journal of Thermoplastic Composite Materials
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This study aims at developing the screen-printed sensors as a viable means of depositing sensing tracks on composites for their on-line structural health monitoring. Conventional silk screen was employed in order to deposit a nano-composite solution comprising of a conductive nano-filler (carbon nano-particles) dispersed in a thermoplastic matrix (high density polystyrene) on laminated composite specimens. The solution was deposited using a squeegee and was allowed to dry. Commercially available metal foil strain gauges were also bonded alongside screen-printed sensor in order to compare the response of the screen-printed sensors with the commercially available strain gauges. The sensing ability of these screen-printed sensors was tested on a universal testing machine (MTS 810) in four-point bending configuration using a load cell of 100 kN. The sensor deposited using screen-printing technique underwent tensile loading at the lower side of the laminate. A data linearization and amplification module comprising of commercially available instrumentation amplifier (INA 118) was used in conjunction with data acquisition module (Keithley KUSB 3100). The results obtained show that the screen-printed sensors have higher gauge factors in tensile loading scenario with reasonably linear response as compared to traditional metal foil strain gauges. The ease of the deposition of a nano-composite solution via screen printing also makes the technique a viable alternative to the traditional resin bonded metal foil strain gauges which have to be bonded on the surface. Moreover, screen printing offers unlimited options for the development of smart composites in various configurations for a multitude of structural applications.

ACS Style

Saad Nauman; Zeeshan Asfar; Sheraz Ahmed; M Ali Nasir; Nourredine Aït Hocine. On the in-situ on-line structural health monitoring of composites using screen-printed sensors. Journal of Thermoplastic Composite Materials 2021, 1 .

AMA Style

Saad Nauman, Zeeshan Asfar, Sheraz Ahmed, M Ali Nasir, Nourredine Aït Hocine. On the in-situ on-line structural health monitoring of composites using screen-printed sensors. Journal of Thermoplastic Composite Materials. 2021; ():1.

Chicago/Turabian Style

Saad Nauman; Zeeshan Asfar; Sheraz Ahmed; M Ali Nasir; Nourredine Aït Hocine. 2021. "On the in-situ on-line structural health monitoring of composites using screen-printed sensors." Journal of Thermoplastic Composite Materials , no. : 1.

Journal article
Published: 12 March 2021 in Plastics, Rubber and Composites
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Thermoresponsive hydrogels have been studied in the past as self-healing and ultra-porous materials. Single-network (SN) and double-network (DN) hydrogels were synthesised in this research using acrylamide, acrylic acid, and alginate. Nano reinforcements were added only to increase the mechanical strength which is reported up to 300%. These DN hydrogels showed brilliant cooling performance showing 8–12°C lesser in a coated house for over 7 h with a single hydration cycle. Tough hydrogels were tested under direct sunlight on wooden and brick houses during the summer of Pakistan, where a 10–20°C temperature difference was reported. Thermographs and FTIR spectra showed that the ionic and covalent crosslinkers were responsible for the excellent robustness. DN hydrogel gave better strength and cooling effectiveness for a longer period than SN hydrogels. Carbon emission and electricity consumption can be reduced using DN hydrogels. These hydrogels can aid the industry of smart buildings and passive cooling.

ACS Style

Muhammad Arslan Bin Riaz; Muhammad Ali Nasir; Saad Nauman; Salman Amin; Faisal Mehmood; Osama Bin Anwar; Osama Hafeez; Temoor Abid. Passive cooling performance of polyacrylamide hydrogel on wooden and brick houses and effect of nanoparticle integration on its mechanical strength. Plastics, Rubber and Composites 2021, 1 -11.

AMA Style

Muhammad Arslan Bin Riaz, Muhammad Ali Nasir, Saad Nauman, Salman Amin, Faisal Mehmood, Osama Bin Anwar, Osama Hafeez, Temoor Abid. Passive cooling performance of polyacrylamide hydrogel on wooden and brick houses and effect of nanoparticle integration on its mechanical strength. Plastics, Rubber and Composites. 2021; ():1-11.

Chicago/Turabian Style

Muhammad Arslan Bin Riaz; Muhammad Ali Nasir; Saad Nauman; Salman Amin; Faisal Mehmood; Osama Bin Anwar; Osama Hafeez; Temoor Abid. 2021. "Passive cooling performance of polyacrylamide hydrogel on wooden and brick houses and effect of nanoparticle integration on its mechanical strength." Plastics, Rubber and Composites , no. : 1-11.

Research article
Published: 18 December 2020 in International Journal of Pavement Engineering
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This research study utilized a Thermal Cycler to simulate the field aging conditions and compared with standard laboratory aging methods. The Thermal Cycler intends to simulate asphalt binder aging under specific environmental conditions. The main purpose of the study is to assess the aging potential in the binder during the thermo-oxidation process. Sulphur, Methane Phosphorus Compound, Elvaloy, Multiwalled Carbon nanotubes, Carbon black nanoparticles, and Graphene nanoplatelets were used and their influence was studied on virgin binder considering their aging sensitivities. Scanning Electron Microscope, Dynamic shear rheometer, and Fourier Transform Infrared spectroscopy were used to study dispersion, rheology, and chemical changes in the binder, respectively. The results showed that aging increases the oxidation process causing more oxygen content formation. The amount of aging in PAV was equivalent to 28 days aged in Thermal Cycler. At higher temperatures, a substantial improvement in Thermal Cyclic aging was observed and around 6–8 h of aging at 110°C produced the same effect as that in PAV. Graphene nanoplatelets modified bitumen with the least Carbonyl and Sulfoxide index is relatively effective to retard aging rate. Sulphur and Methane Phosphorous Compound are relatively more sensitive to thermo-oxidative aging than the rest of the modified blends.

ACS Style

Gohar Alam; Imran Hafeez; Ghulam Yaseen; Muhammad Ali Nasir; Azhar Hussain; Naveed Ahmad. Assessing the aging tendency of asphalt binder using a thermal cycler. International Journal of Pavement Engineering 2020, 1 -12.

AMA Style

Gohar Alam, Imran Hafeez, Ghulam Yaseen, Muhammad Ali Nasir, Azhar Hussain, Naveed Ahmad. Assessing the aging tendency of asphalt binder using a thermal cycler. International Journal of Pavement Engineering. 2020; ():1-12.

Chicago/Turabian Style

Gohar Alam; Imran Hafeez; Ghulam Yaseen; Muhammad Ali Nasir; Azhar Hussain; Naveed Ahmad. 2020. "Assessing the aging tendency of asphalt binder using a thermal cycler." International Journal of Pavement Engineering , no. : 1-12.

Journal article
Published: 24 December 2019 in Construction and Building Materials
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The main purpose of this research study was to predict moisture damage probability of asphalt mixtures using pure case study i.e. tests on loose as well as compacted asphalt mixtures. Polymer, chemical, filler-based modifiers and four aggregate sources i.e. calcium carbonate, dolomite, dolerite and granite minerals were selected to ascertain their effect on moisture damage of asphalt mixtures. Laboratory test results of both test regimes were compared to develop moisture damage index. The analysis of test data showed that filler-based modifiers were better anti-stripping followed by chemical-based modifiers. Moreover, granite minerals showed more loss of adhesion due to less polarity, hydrophilic and acidic nature of aggregates. Basic aggregates (calcium carbonate and dolomite) with its hydrophilic nature were relatively better antistripping. This is mainly due to its high polarity to make relatively stronger bond with asphalt binder. Boiling water test was easy to perform and less time consuming while rolling bottle test was found relatively more reliable in comparison with other tests on loose coated asphalt mixture. In compacted asphalt mixtures test regime, although Marshal stability was easy to perform, but Modified Lottman test as well as Hamburg wheel track test were found relatively better to access moisture susceptibility with reasonable confidence level. A pure case study was compromises of qualitative (tests on loose coated asphalt mixture) as well as quantitative (tests on compacted asphalt mixture) to ascertain relative accuracy of each test on moisture damage.

ACS Style

Safeer Haider; Imran Hafeez; Syed Bilal Ahmed Zaidi; Muhammad Ali Nasir; M. Rizwan. A pure case study on moisture sensitivity assessment using tests on both loose and compacted asphalt mixture. Construction and Building Materials 2019, 239, 117817 .

AMA Style

Safeer Haider, Imran Hafeez, Syed Bilal Ahmed Zaidi, Muhammad Ali Nasir, M. Rizwan. A pure case study on moisture sensitivity assessment using tests on both loose and compacted asphalt mixture. Construction and Building Materials. 2019; 239 ():117817.

Chicago/Turabian Style

Safeer Haider; Imran Hafeez; Syed Bilal Ahmed Zaidi; Muhammad Ali Nasir; M. Rizwan. 2019. "A pure case study on moisture sensitivity assessment using tests on both loose and compacted asphalt mixture." Construction and Building Materials 239, no. : 117817.

Article
Published: 03 September 2019 in Journal of Mechanical Science and Technology
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Natural fiber composites have great potential for reducing the product cost, lowering weight and enhancing renewability. Functionality and performance of natural fibers can be enhanced many folds using them together with synthetic fibers. Hybridization of carbon and low-cost natural jute fiber offers a sustainable hybrid composite having high modulus and mechanical strength. This study investigates flexural behavior of carbon/jute epoxy composites experimentally and numerically. Also, impact response is characterized through drop weight method. Study concludes that flexural strength decreases with increase in jute percentage. Simulation of flexural behavior diverges more than 10 % from experimental results. This anomaly is due to waviness of fiber resulting in heterogeneous property distribution in composites. Further, the fracto-graphic study revealed modes of failure. The drop weight impact tests reveal increased damage area with increase in jute percentage.

ACS Style

Aakash Ali; Muhammad Ali Nasir; Muhammad Yasir Khalid; Saad Nauman; Khubab Shaker; Shahab Khushnood; Khurram Altaf; Muhammad Zeeshan; Azhar Hussain. Experimental and numerical characterization of mechanical properties of carbon/jute fabric reinforced epoxy hybrid composites. Journal of Mechanical Science and Technology 2019, 33, 4217 -4226.

AMA Style

Aakash Ali, Muhammad Ali Nasir, Muhammad Yasir Khalid, Saad Nauman, Khubab Shaker, Shahab Khushnood, Khurram Altaf, Muhammad Zeeshan, Azhar Hussain. Experimental and numerical characterization of mechanical properties of carbon/jute fabric reinforced epoxy hybrid composites. Journal of Mechanical Science and Technology. 2019; 33 (9):4217-4226.

Chicago/Turabian Style

Aakash Ali; Muhammad Ali Nasir; Muhammad Yasir Khalid; Saad Nauman; Khubab Shaker; Shahab Khushnood; Khurram Altaf; Muhammad Zeeshan; Azhar Hussain. 2019. "Experimental and numerical characterization of mechanical properties of carbon/jute fabric reinforced epoxy hybrid composites." Journal of Mechanical Science and Technology 33, no. 9: 4217-4226.

Journal article
Published: 09 April 2019 in Ultrasonics Sonochemistry
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Partially hydrolyzed Polyacrylamide (PHPAM) crosslinked by Cr+3 is frequently applied to plug thief zone for the better water management in matured oil reservoir. However, PHPAM gel may certainly cause inevitable formation damage nearby the wellbore. Although various kinds of chemical agents, such as hydrogen peroxide (H2O2), sodium hypochlorite (NaOCl), and chlorine dioxide (ClO2) were employed to mitigate the nearby wellbore damage. But, huge financial investment, poor degelation efficiency, environmentally insecure, corrosion problem, and long time span requirement persuade researchers to look for other effective technique. In this connection, ultrasonic waves is characterized by reliable, environment friendly, and cost effective technology. Current work involves comparative study of PHPAM gel degradation by the individual means of chemical agent and ultrasonic waves. Subsequently, the best-performed ultrasonic parameters and well-performed chemical agent were used independently and then simultaneously to deplug (PHPAM gel) the core sample. Results showed that 20 KHz frequency (1000 W) effectively reduced gel viscosity from original (2495 mPa.s) to 1.37 mPa.s after 10 mins irradiation. This degradation is attributed to cavitation, heat energy, and hydroxyl radical (HO∙). However, after 2 mins further exposure, the viscosity grew back to 3.29 mPa.s (18 KHz), 1.42 mPa.s (20 KHz), and 3.74 mPa.s (25 KHz). This adverse behavior is owing to hydroxyl radical (HO∙) annihilation. In chemical treatment, H2O2 among other chemicals efficiently degelled the PHPAM gel’s original viscosity to 2.64 mPa.s after 24 hours reaction. Similarly, NaOCl and ClO2 brought down original viscosity to 6.5 mPa.s and 159 mPa.s respectively. SEM of the samples before and after treatment was performed for the better understanding of PHPAM gel morphology. Considering dynamic experiment, maximum 23.5 % and 19.80 % damaged permeability recovery (30×10-3 μm2 gas permeability) were obtained by applying ultrasonic waves (20 KHz, 1000 W, and 100 mins irradiation) and chemical agent (H2O2) respectively. Permeability recovery was further increased to 40.90 % by the simultaneous application of ultrasonic waves and chemical agent.

ACS Style

Nasir Khan; Jingyang Pu; Chunsheng Pu; Hongxing Xu; Xiaoyu Gu; Zhang Lei; Feifei Huang; Muhammad Ali Nasir; Rooh Ullah. Experimental and mechanism study: Partially hydrolyzed polyacrylamide gel degradation and deplugging via ultrasonic waves and chemical agents. Ultrasonics Sonochemistry 2019, 56, 350 -360.

AMA Style

Nasir Khan, Jingyang Pu, Chunsheng Pu, Hongxing Xu, Xiaoyu Gu, Zhang Lei, Feifei Huang, Muhammad Ali Nasir, Rooh Ullah. Experimental and mechanism study: Partially hydrolyzed polyacrylamide gel degradation and deplugging via ultrasonic waves and chemical agents. Ultrasonics Sonochemistry. 2019; 56 ():350-360.

Chicago/Turabian Style

Nasir Khan; Jingyang Pu; Chunsheng Pu; Hongxing Xu; Xiaoyu Gu; Zhang Lei; Feifei Huang; Muhammad Ali Nasir; Rooh Ullah. 2019. "Experimental and mechanism study: Partially hydrolyzed polyacrylamide gel degradation and deplugging via ultrasonic waves and chemical agents." Ultrasonics Sonochemistry 56, no. : 350-360.

Article
Published: 17 February 2019 in Applied Sciences
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With the increase in the demand for bitumen, it has become essential for pavement engineers to ensure that construction of sustainable pavements occurs. For a complete analysis of the pavement, both its structural and functional performances are considered. In this study, a novel material (i.e., Graphene Nano-Platelets (GNPs)) has been used to enhance both of the types of pavements’ performances. Two percentages of GNPs (i.e., 2% and 4% by the weight of the binder) were used for the modification of asphalt binder in order to achieve the desired Performance Grade. GNPs were homogeneously dispersed in the asphalt binder, which was validated by Scanning Electron Microscope (SEM) images and a Hot Storage Stability Test. To analyze the structural performance of the GNPs-doped asphalt, its rheology, resistance to permanent deformation, resistance to moisture damage, and bitumen-aggregate adhesive bond strength were studied. For the analysis of the functional performance, the skid resistance and polishing effect were studied using a British Pendulum Skid Resistance Tester. The results showed that GNPs improved not only the rutting resistance of the pavement but also its durability. The high surface area of GNPs increases the pavement’s bonding strength and makes the asphalt binder stiffer. GNPs also provide nano-texture to the pavement, which enhances its skid resistance. Thus, we can recommend GNPs as an all-around modifier that could improve not only the structural performance but also the functional performance of asphalt pavements.

ACS Style

Murryam Hafeez; Naveed Ahmad; Mumtaz Ahmed Kamal; Javaria Rafi; Muhammad Faizan Ul Haq; Jamal; Syed Bilal Ahmed Zaidi; Muhammad Ali Nasir. Experimental Investigation into the Structural and Functional Performance of Graphene Nano-Platelet (GNP)-Doped Asphalt. Applied Sciences 2019, 9, 686 .

AMA Style

Murryam Hafeez, Naveed Ahmad, Mumtaz Ahmed Kamal, Javaria Rafi, Muhammad Faizan Ul Haq, Jamal, Syed Bilal Ahmed Zaidi, Muhammad Ali Nasir. Experimental Investigation into the Structural and Functional Performance of Graphene Nano-Platelet (GNP)-Doped Asphalt. Applied Sciences. 2019; 9 (4):686.

Chicago/Turabian Style

Murryam Hafeez; Naveed Ahmad; Mumtaz Ahmed Kamal; Javaria Rafi; Muhammad Faizan Ul Haq; Jamal; Syed Bilal Ahmed Zaidi; Muhammad Ali Nasir. 2019. "Experimental Investigation into the Structural and Functional Performance of Graphene Nano-Platelet (GNP)-Doped Asphalt." Applied Sciences 9, no. 4: 686.

Article
Published: 14 January 2019 in Journal of Mechanical Science and Technology
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In this study experimental investigation of interlaminar shear strength of glass fibre reinforced thermoplastic polyurethane (TPU) and epoxy based thermosets composites enhanced with multi walled carbon nanotubes (MWCNTs) is presented, and comparison is made between thermoplastic and thermosets composites. Suspension of MWCNTs in TPU and epoxy matrix was prepared using magnetic stirring and sonication technique. Both thermoplastic reinforced glass fibre and thermosets reinforced glass fibre composites were manufactured using hand layup technique. Carbon nanotubes were added in the concentrations of 0.1 %weight, 0.3 %weight and 0.5 %weight in both types of composites. Results showed that as the concentration of CNTs increases, the ILSS of the nanocomposites was also improved. With an addition of 0.5 % weight CNTs, there was improvement of 24.37 % in ILSS in epoxy based composites and 10.05 % enhancement in thermoplastic polyurethane reinforced glass fibre composites. The average ILSS obtained for thermoplastic polyurethane composites was less than that of epoxy composites. The TPU based composites also demonstrated inelastic deformations without any trace of brittle fracture. The pristine epoxy based composites on the other hand did show inelastic deformations followed by brittle fracture. Higher concentrations of MWCNTs led to an absence of brittle fracture during the tests, owing to the crack bridging effect of the CNTs.

ACS Style

Saamia Zahid; Muhammad Ali Nasir; Saad Nauman; Mehmet Karahan; Yasir Nawab; H. M. Ali; Yasir Khalid; Muhammad Nabeel; Mudaser Ullah. Experimental analysis of ILSS of glass fibre reinforced thermoplastic and thermoset textile composites enhanced with multiwalled carbon nanotubes. Journal of Mechanical Science and Technology 2019, 33, 197 -204.

AMA Style

Saamia Zahid, Muhammad Ali Nasir, Saad Nauman, Mehmet Karahan, Yasir Nawab, H. M. Ali, Yasir Khalid, Muhammad Nabeel, Mudaser Ullah. Experimental analysis of ILSS of glass fibre reinforced thermoplastic and thermoset textile composites enhanced with multiwalled carbon nanotubes. Journal of Mechanical Science and Technology. 2019; 33 (1):197-204.

Chicago/Turabian Style

Saamia Zahid; Muhammad Ali Nasir; Saad Nauman; Mehmet Karahan; Yasir Nawab; H. M. Ali; Yasir Khalid; Muhammad Nabeel; Mudaser Ullah. 2019. "Experimental analysis of ILSS of glass fibre reinforced thermoplastic and thermoset textile composites enhanced with multiwalled carbon nanotubes." Journal of Mechanical Science and Technology 33, no. 1: 197-204.

Journal article
Published: 17 December 2018 in Applied Sciences
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Conventional binders cannot meet the current performance requirements of asphaltic pavements due to increase in traffic volumes and loads. Nanomaterials, due to their exceptional mechanical properties, are gaining popularity as bitumen modifiers to enhance the performance properties of the asphaltic concrete. Carbon Nanotubes (CNTs) are one of the most widely used nanomaterials because of their strength properties, light weight, small size, and large surface area. CNT addition results in improved substrate characteristics as compared to other modifiers. Due to high length to diameter ratio, dispersion of CNTs in bitumen is a complex phenomenon. In this study, dispersion of CNTs in bitumen was carried out using both dry and wet mixing techniques, the latter was selected on the basis of homogeneity of the resultant asphalt mixture. Scanning Electron Microscopy (SEM) was used to check the dispersion of CNTs in binder while Fourier Transform Infrared Spectroscopy (FTIR) was carried out to ensure the removal of solvent used for wet mixing. Conventional bitumen tests (penetration, softening point, and ductility), dynamic shear rheometer tests, rolling bottle tests, and bitumen bond strength tests were employed to check the improvement in the rheological and adhesion properties of bitumen while wheel tracker test was used to check the improvement in resistance against permanent deformation of asphalt mixtures after addition of CNTs. Results show that CNTs improved the higher temperature performance and permanent deformation resistance in both binder and mixtures. Improvement in bitumen–aggregate adhesion properties and moisture resistance was also observed.

ACS Style

Muhammad Faizan Ul Haq; Naveed Ahmad; Muhammad Ali Nasir; Jamal; Murryam Hafeez; Javaria Rafi; Syed Bilal Ahmed Zaidi; Waqas Haroon. Carbon Nanotubes (CNTs) in Asphalt Binder: Homogeneous Dispersion and Performance Enhancement. Applied Sciences 2018, 8, 2651 .

AMA Style

Muhammad Faizan Ul Haq, Naveed Ahmad, Muhammad Ali Nasir, Jamal, Murryam Hafeez, Javaria Rafi, Syed Bilal Ahmed Zaidi, Waqas Haroon. Carbon Nanotubes (CNTs) in Asphalt Binder: Homogeneous Dispersion and Performance Enhancement. Applied Sciences. 2018; 8 (12):2651.

Chicago/Turabian Style

Muhammad Faizan Ul Haq; Naveed Ahmad; Muhammad Ali Nasir; Jamal; Murryam Hafeez; Javaria Rafi; Syed Bilal Ahmed Zaidi; Waqas Haroon. 2018. "Carbon Nanotubes (CNTs) in Asphalt Binder: Homogeneous Dispersion and Performance Enhancement." Applied Sciences 8, no. 12: 2651.

Research article
Published: 11 November 2018 in Journal of Thermoplastic Composite Materials
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In this article, we have explored screen printing as a fast and reliable process for the deposition of nanocomposite layer on glass fiber-reinforced plastic (GFRP) substrate for in situ structural health monitoring. The screen-printed sensor comprised of a thermoplastic matrix (high density polystyrene) and a dispersed nanofiller (carbon nanoparticles). Notches of different sizes (2.5 mm and 4.0 mm) were introduced to study the response of sensors to an existing damage. Stress concentrations were plotted across the width and the sensor results were correlated with the simulated stress concentrations to evaluate the response of sensors with respect to local stress concentrations. It was found that the screen-printed sensors responded to the stress concentrations since the layers were deposited in the vicinity of notches. The gauge factors altered due to the presence of notches indicating sensor sensitivity to the preexisting damage and resultant stress concentrations.

ACS Style

Taimoor A Khan; Saad Nauman; Zeeshan Asfar; M Ali Nasir; Zaffar Khan. Screen-printed nanocomposite sensors for online in situ structural health monitoring. Journal of Thermoplastic Composite Materials 2018, 33, 236 -253.

AMA Style

Taimoor A Khan, Saad Nauman, Zeeshan Asfar, M Ali Nasir, Zaffar Khan. Screen-printed nanocomposite sensors for online in situ structural health monitoring. Journal of Thermoplastic Composite Materials. 2018; 33 (2):236-253.

Chicago/Turabian Style

Taimoor A Khan; Saad Nauman; Zeeshan Asfar; M Ali Nasir; Zaffar Khan. 2018. "Screen-printed nanocomposite sensors for online in situ structural health monitoring." Journal of Thermoplastic Composite Materials 33, no. 2: 236-253.

Technical paper
Published: 27 July 2018 in Journal of the Brazilian Society of Mechanical Sciences and Engineering
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Graphene nanocomposites are constantly being explored for their applicability in the growing domain of strain monitoring (Jing et al. in Chin Phys B 22(5):057701, 2013) for real-time health and integrity assessment of structural parts. Strain gauges were manufactured by incorporating conductive graphene nanoplatelets (GNPs) in insulating polystyrene matrix by varying filler concentrations. Initial measurements showed that the resistance of these gauges decreases with increasing content of GNPs. For structural health monitoring (SHM) applications, these gauges were pasted on laminated glass fiber composite substrate. The specimens with integrated gauges were tested under monotonic tensile loading. The piezoresistive response of gauges was observed and registered as a means to detect strains in the composite specimens. The results presented in this paper demonstrate SHM capabilities of these smart strain gauges.

ACS Style

Muhammad Anas; Muhammad Ali Nasir; Zeeshan Asfar; Saad Nauman; Mehmet Akalin; Faiz Ahmad. Structural health monitoring of GFRP laminates using graphene-based smart strain gauges. Journal of the Brazilian Society of Mechanical Sciences and Engineering 2018, 40, 397 .

AMA Style

Muhammad Anas, Muhammad Ali Nasir, Zeeshan Asfar, Saad Nauman, Mehmet Akalin, Faiz Ahmad. Structural health monitoring of GFRP laminates using graphene-based smart strain gauges. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2018; 40 (8):397.

Chicago/Turabian Style

Muhammad Anas; Muhammad Ali Nasir; Zeeshan Asfar; Saad Nauman; Mehmet Akalin; Faiz Ahmad. 2018. "Structural health monitoring of GFRP laminates using graphene-based smart strain gauges." Journal of the Brazilian Society of Mechanical Sciences and Engineering 40, no. 8: 397.

Original
Published: 04 July 2018 in Heat and Mass Transfer
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This experimental work investigates the combination of phase change material (PCM) with thermal storage units to combat excessive heat generation in high application hand-held conveniences. Four heat sink configurations including a no fin and three pin-fin arrays having pin diameters of 2 mm, 3 mm and 4 mm respectively are tested using four discreet volume fractions (0.0, 0.3, 0.6, 0.9) of n-eicosane as PCM under heavy usage power levels of 5–7 W. Round pins, made in aluminum, are incorporated in 9% volume percentage of sink’s bulk to act as thermal conductivity enhancer (TCE) in heat sinks. Parametric probe involved the impact of n-eicosane volume fractions, spatial variation of temperature, Fourier number (Fo), enhancement ratio, Modified Stephan number (Ste*), heat capacity as well as thermal conductance to provide for insights on superior thermal performance for distinct operating conditions of the hand-held. The outturns proclaimed that increasing volume fractions of PCM result in increased service time of the heat sinks. Effect of pin-fin configurations were found to be negligible on spatial temperature variation. Amongst all heat sinks, 3 mm pin-fin arrangement resulted in highest enhancement ratio, heat capacity & thermal conductance for all volume fractions of n-eicosane, thereby, demonstrated best thermal conduct of all four sink arrays.

ACS Style

Shah Rukh; Riffat Asim Pasha; Muhammad Ali Nasir. Heat transfer enhancement of round pin heat sinks using N-eicosane as PCM: an experimental study. Heat and Mass Transfer 2018, 55, 309 -325.

AMA Style

Shah Rukh, Riffat Asim Pasha, Muhammad Ali Nasir. Heat transfer enhancement of round pin heat sinks using N-eicosane as PCM: an experimental study. Heat and Mass Transfer. 2018; 55 (2):309-325.

Chicago/Turabian Style

Shah Rukh; Riffat Asim Pasha; Muhammad Ali Nasir. 2018. "Heat transfer enhancement of round pin heat sinks using N-eicosane as PCM: an experimental study." Heat and Mass Transfer 55, no. 2: 309-325.

Research article
Published: 10 June 2018 in Journal of Thermoplastic Composite Materials
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This article presents an investigation regarding the ballistic performance of hybrid panels formed by combining woven and unidirectional (UD) para-aramid fabrics. For this purpose, hybrid panels are formed by combining woven and UD para-aramid fabrics with different ply ratios. The hybrid panels formed in this way are subjected to ballistic tests according to National Institute of Justice (NIJ) standard. The results show that hybrid panels present 4.48% less trauma depth as compared to 100% woven fabric panels and 3% less trauma diameter as compared to 100% UD fabric panels. Furthermore, 13.9% less energy is transmitted to the back side of hybrid panels as compared to 100% UD fabric panels. The energy absorbed per unit weight in hybrid panels is 8.48% more as compared to 100% woven fabrics. Additionally, in wet conditions, less trauma depth of hybrid panels is observed as compared to both 100% woven and 100% K-Flex UD fabric panels. No significant difference is realized in trauma diameter between hybrid panels and 100% woven fabric panels in wet conditions. However, 3.25% less trauma diameter is noticed in hybrid panels as compared to 100% UD fabric panels.

ACS Style

Mehmet Karahan; Nevin Karahan; Muhammad Ali Nasir; Yasir Nawab. Effect of structural hybridization on ballistic performance of aramid fabrics. Journal of Thermoplastic Composite Materials 2018, 32, 795 -814.

AMA Style

Mehmet Karahan, Nevin Karahan, Muhammad Ali Nasir, Yasir Nawab. Effect of structural hybridization on ballistic performance of aramid fabrics. Journal of Thermoplastic Composite Materials. 2018; 32 (6):795-814.

Chicago/Turabian Style

Mehmet Karahan; Nevin Karahan; Muhammad Ali Nasir; Yasir Nawab. 2018. "Effect of structural hybridization on ballistic performance of aramid fabrics." Journal of Thermoplastic Composite Materials 32, no. 6: 795-814.

Journal article
Published: 01 March 2018 in Advances in Science and Technology Research Journal
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ACS Style

Yasir Bilal; Muhammad Ali Nasir; Sadia Nasreen; Niaz Akhter; Riffat Asim Pasha; Muhammad Farhan Noor. Synthesis and Activity Evaluation of Ce-Mn-Cu Mixed Oxide Catalyst for Selective Oxidation of CO in Automobile Engine Exhaust: Effect of Ce/Mn Loading Content on Catalytic Activity. Advances in Science and Technology Research Journal 2018, 12, 260 -266.

AMA Style

Yasir Bilal, Muhammad Ali Nasir, Sadia Nasreen, Niaz Akhter, Riffat Asim Pasha, Muhammad Farhan Noor. Synthesis and Activity Evaluation of Ce-Mn-Cu Mixed Oxide Catalyst for Selective Oxidation of CO in Automobile Engine Exhaust: Effect of Ce/Mn Loading Content on Catalytic Activity. Advances in Science and Technology Research Journal. 2018; 12 (1):260-266.

Chicago/Turabian Style

Yasir Bilal; Muhammad Ali Nasir; Sadia Nasreen; Niaz Akhter; Riffat Asim Pasha; Muhammad Farhan Noor. 2018. "Synthesis and Activity Evaluation of Ce-Mn-Cu Mixed Oxide Catalyst for Selective Oxidation of CO in Automobile Engine Exhaust: Effect of Ce/Mn Loading Content on Catalytic Activity." Advances in Science and Technology Research Journal 12, no. 1: 260-266.

Journal article
Published: 03 September 2017 in Advances in Science and Technology Research Journal
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ACS Style

Muhammad Farhan Noor; Riffat Asim Pasha; Aneela Wakeel; Muhammad Ali Nasir; Yasir Bilal. Effect of Thermal Cycling on the Tensile Behavior of CF/AL Fiber Metal Laminates. Advances in Science and Technology Research Journal 2017, 11, 80 -86.

AMA Style

Muhammad Farhan Noor, Riffat Asim Pasha, Aneela Wakeel, Muhammad Ali Nasir, Yasir Bilal. Effect of Thermal Cycling on the Tensile Behavior of CF/AL Fiber Metal Laminates. Advances in Science and Technology Research Journal. 2017; 11 (3):80-86.

Chicago/Turabian Style

Muhammad Farhan Noor; Riffat Asim Pasha; Aneela Wakeel; Muhammad Ali Nasir; Yasir Bilal. 2017. "Effect of Thermal Cycling on the Tensile Behavior of CF/AL Fiber Metal Laminates." Advances in Science and Technology Research Journal 11, no. 3: 80-86.

Article
Published: 05 May 2017 in Mechanics of Composite Materials
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This work deals with determination of the transverse shear moduli of a Nomex® honeycomb core of sandwich panels. Their out-of-plane shear characteristics depend on the transverse shear moduli of the honeycomb core. These moduli were determined experimentally, numerically, and analytically. Numerical simulations were performed by using a unit cell model and three analytical approaches. Analytical calculations showed that two of the approaches provided reasonable predictions for the transverse shear modulus as compared with experimental results. However, the approach based upon the classical lamination theory showed large deviations from experimental data. Numerical simulations also showed a trend similar to that resulting from the analytical models.

ACS Style

M. I. Farooqi; M. A. Nasir; H. M. Ali; Y. Ali. Experimental Validation of the Transverse Shear Behavior of a Nomex Core for Sandwich Panels. Mechanics of Composite Materials 2017, 53, 193 -202.

AMA Style

M. I. Farooqi, M. A. Nasir, H. M. Ali, Y. Ali. Experimental Validation of the Transverse Shear Behavior of a Nomex Core for Sandwich Panels. Mechanics of Composite Materials. 2017; 53 (2):193-202.

Chicago/Turabian Style

M. I. Farooqi; M. A. Nasir; H. M. Ali; Y. Ali. 2017. "Experimental Validation of the Transverse Shear Behavior of a Nomex Core for Sandwich Panels." Mechanics of Composite Materials 53, no. 2: 193-202.

Journal article
Published: 02 February 2017 in The Journal of The Textile Institute
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Muhammad Haris Ameer; Khubab Shaker; Munir Ashraf; Mehmet Karahan; Yasir Nawab; Sheraz Ahmad; Muhammad Ali Nasir. Interdependence of moisture, mechanical properties, and hydrophobic treatment of jute fibre-reinforced composite materials. The Journal of The Textile Institute 2017, 108, 1 -9.

AMA Style

Muhammad Haris Ameer, Khubab Shaker, Munir Ashraf, Mehmet Karahan, Yasir Nawab, Sheraz Ahmad, Muhammad Ali Nasir. Interdependence of moisture, mechanical properties, and hydrophobic treatment of jute fibre-reinforced composite materials. The Journal of The Textile Institute. 2017; 108 (10):1-9.

Chicago/Turabian Style

Muhammad Haris Ameer; Khubab Shaker; Munir Ashraf; Mehmet Karahan; Yasir Nawab; Sheraz Ahmad; Muhammad Ali Nasir. 2017. "Interdependence of moisture, mechanical properties, and hydrophobic treatment of jute fibre-reinforced composite materials." The Journal of The Textile Institute 108, no. 10: 1-9.

Article
Published: 14 January 2015 in Mechanics of Composite Materials
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The out-of-plane transverse shear characteristics of a Nomex honeycomb core have been studied. Finite-element analyses were performed to find the equivalent transverse shear moduli of the honeycomb core by using a unit-cell-based modeling approach with account of the orthotropic nature of Nomex paper. The results obtained are compared with those of three theoretical approaches. The differences between the numerical and theoretical results are attributed to the isotropic behavior of the basic core material considered in the theoretical approaches.

ACS Style

M. A. Nasir; I. Farooqi; S. Nauman; S. Anas; S. Khalil; A. Pasha; Z. Khan; M. Shah; H. Qaiser; R. Ata. Transverse Shear Behavior of a Nomex Core for Sandwich Panels. Mechanics of Composite Materials 2015, 50, 733 -738.

AMA Style

M. A. Nasir, I. Farooqi, S. Nauman, S. Anas, S. Khalil, A. Pasha, Z. Khan, M. Shah, H. Qaiser, R. Ata. Transverse Shear Behavior of a Nomex Core for Sandwich Panels. Mechanics of Composite Materials. 2015; 50 (6):733-738.

Chicago/Turabian Style

M. A. Nasir; I. Farooqi; S. Nauman; S. Anas; S. Khalil; A. Pasha; Z. Khan; M. Shah; H. Qaiser; R. Ata. 2015. "Transverse Shear Behavior of a Nomex Core for Sandwich Panels." Mechanics of Composite Materials 50, no. 6: 733-738.

Journal article
Published: 20 September 2014 in International Journal of Material Forming
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Aramid Aluminum laminates (ARALLs), which belong to the family of fiber metal laminates (FML’s) are prone to interlaminar shearing because of weak bonding between Aluminium and Kevlar layers. Moreover standard fabrication procedure of these composites is to use unidirectional fiber prepregs with Aluminium alloy sheets. The fabrication thus involves expensive semi prepared materials (prepregs) followed by autoclaving. Over the recent years VARTM (Vacuum assisted resin transfer molding) has emerged as a viable and low cost technique for composites fabrication. In this paper an alternative fabrication procedure for ARALL composites using VARTM has been presented. For this purpose Aluminium 2024 T3 alloy and plain woven Para-Aramid (Kevlar 49 from DuPont) fibrous tow sheets were used to make ARALL composites. ARALL comprises of one sheet of Kevlar in the center and two layers of Aluminum on its two sides. Two types of Aluminium sheets were prepared i.e., anodized and unanodized. Specimens were prepared using VARTM technology. Two types of post curing treatments were chosen. One group of specimens was post cured at 100 °C while the other group was left to cure at room temperature. T-peel tests were then conducted using ASTM D1876 standard on ARALL specimens thus prepared. This research study entails anodization and curing/post curing for enhancement of interfacial bonding so as to suppress interfacial debonding. Various parameters in this respect have been varied and their effect on the interfacial bond strength and thus on the Mode-I fracture toughness has been quantized. Experimental results, electrochemical characterization and optical/SEM observations of delaminated surfaces have established that anodization coupled with post curing results in an optimized interface between Aluminium alloy and Para-Aramid sheets. The optimization scheme described in this paper can be used to manufacture ARALL composites through low cost VARTM technology.

ACS Style

Haroon Qaiser; Suniya Umar; Ali Nasir; Masood Shah; Saad Nauman. Optimization of interlaminar shear strength behavior of anodized and unanodized ARALL composites fabricated through VARTM process. International Journal of Material Forming 2014, 8, 481 -493.

AMA Style

Haroon Qaiser, Suniya Umar, Ali Nasir, Masood Shah, Saad Nauman. Optimization of interlaminar shear strength behavior of anodized and unanodized ARALL composites fabricated through VARTM process. International Journal of Material Forming. 2014; 8 (3):481-493.

Chicago/Turabian Style

Haroon Qaiser; Suniya Umar; Ali Nasir; Masood Shah; Saad Nauman. 2014. "Optimization of interlaminar shear strength behavior of anodized and unanodized ARALL composites fabricated through VARTM process." International Journal of Material Forming 8, no. 3: 481-493.