Tensile behavior of quasi-unidirectional glass fiber/polypropylene composites at room and elevated temperatures |
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| Affiliation: | 1. Mechanical Engineering Department, College of Engineering, Tikrit University, Tikrit, Slahddin, Iraq;2. Electro-Mechanical Engineering Department, College of Engineering, Samarra University, Samarra, Salahddin, Iraq;3. Department of Chemical Engineering, College of Engineering, Tikrit University, Tikrit, Slahddin, Iraq;1. Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary;2. MTA–BME Research Group for Composite Science and Technology, Műegyetem rkp. 3, H-1111 Budapest, Hungary;3. Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, GD HPPC Lab, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 510275 Guangzhou, PR China;4. Guangdong Provincial Public Laboratory of Analysis and Testing Technology, China National Analytical Center, 510070 Guangzhou, PR China;1. Department Metaalkunde en Toegepaste Materiaalkunde, Kasteelpark Arenberg 44 bus 2450, KU Leuven, Belgium;2. Soft Matter Group, University of Leeds, Leeds LS2 9JT, United Kingdom;1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Plastic and Aesthetic Surgery, Hua Dong Hospital, Fu Dan University, Shanghai 200040, China |
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| Abstract: | In the present study, the tensile behavior of quasi-unidirectional glass fiber/polypropylene composites at room and elevated temperatures were investigated by both micro- and macromechanical test methods. In the micromechanical studies, a single fiber fragmentation test was employed for measuring the interfacial shear strength at fiber-polypropylene interface in the temperature range from 23 °C to 90 °C. The results show that interfacial shear strength decreases with increasing testing temperature. In the macromechanical studies, experimental results show that the elastic modulus of polypropylene and transverse elastic modulus of composites are sensitive to the testing temperature. The weakened fiber-polypropylene interface due to elevated temperatures led to the vanishing of “knee” in transverse tensile stress-strain curves. A function was proposed to evaluate the dependence of the elastic modulus of quasi-unidirectional glass fiber/polypropylene composites on the testing temperatures and tested against experimental data. Tensile failure mechanisms of composites were demonstrated to evolve with the testing temperature. |
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| Keywords: | Composites Tensile behavior Elevated temperature Fiber-matrix interface |
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