Temperature-dependent mechanical behaviour of PMMA: Experimental analysis and modelling |
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| Affiliation: | 1. Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, 21544, Egypt;2. Department of Metallurgy and Materials Engineering, Faculty of Petroleum and Mining Engineering, Suez University, Suez, 43721, Egypt;3. Mechanical Engineering Department, College of Engineering, Al Imam Mohammad Ibn Saud Islamic University, Riyadh 11432, Saudi Arabia;4. Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough Leicestershire LE11 3TU, UK;1. School of Mechanical and Chemical Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia;2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, PR China;1. Fatigue and Fracture Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16846-13114, Tehran, Iran;2. School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846, Iran;3. Hydro-Aeronautical Research Center, Shiraz University, 71348-13668, Shiraz, Iran;1. CEITEC, Brno University of Technology, 61200 Brno, Czech Republic;2. Department of Physics, University of Southern Florida, Tampa, FL 33620, USA |
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| Abstract: | An experimental study of temperature-dependent mechanical behaviour of Poly-methyl methacrylate (PMMA) was performed at a range of temperatures (20 °C, 40 °C, 60 °C and 80 °C) below its glass transition point (108 °C) under uniaxial tension and three-point bending loading conditions. This study was accompanied by simulations aimed at identification of material parameters for two different constitutive material models. Experimental flow curves obtained for PMMA were used in elasto-plastic analysis, while a sim-flow optimization tool was employed for a two-layer viscoplasticity model. The temperature increase significantly affected mechanical behaviour of PMMA, with quasi-brittle fracture at room temperature and super-plastic behaviour (ε>110%) at 80 °C. The two-layer viscoplasticity material model was found to agree better with the experimental data obtained for uniaxial tension than the elasto-plastic description. |
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| Keywords: | Poly (methyl methacrylate) Uniaxial tension Three-point bending Temperature dependence Finite element Two-layer viscoplasticity |
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