Temperature-dependent mechanical behaviour of PMMA: Experimental analysis and modelling
Temperature-dependent mechanical behaviour of PMMA: Experimental analysis and modelling
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DOI：
10.1016/j.polymertesting.2016.12.016
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发表时间：
2017-04-01
期刊：
影响因子：
5.1
通讯作者：
Silberschmidt, Vadim V.
中科院分区：
文献类型：
--
作者：
Abdel-Wahab, Adel A.;Ataya, Sabbah;Silberschmidt, Vadim V.
在低于玻璃化转变点(108℃)的温度范围内(20℃、40℃、60℃和80℃)，对聚甲基丙烯酸甲酯(PMMA)在单轴拉伸和三点弯曲加载条件下的变温力学行为进行了实验研究。伴随这项研究的是两种不同本构材料模型的材料参数识别的模拟。实验得到的PMMA流动曲线用于弹塑性分析，而SIM-Flow优化工具用于两层粘塑性模型。温度升高对PMMA的力学行为有显著影响，在室温下表现为准脆性断裂，在80℃时表现为超塑性行为(epsilon>；110%)。两层粘塑性材料模型比弹塑性描述更符合单轴拉伸的实验数据。(C)2016爱思唯尔有限公司。保留所有权利。
An experimental study of temperature-dependent mechanical behaviour of Poly-methyl methacrylate (PMMA) was performed at a range of temperatures (20 degrees C, 40 degrees C, 60 degrees C and 80 degrees C) below its glass transition point (108 degrees 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 (epsilon>110%) at 80 degrees 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. (C) 2016 Elsevier Ltd. All rights reserved.