Tensile mechanical properties and constitutive relation of microcellular polycarbonate
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摘要: 微孔泡沫塑料是一种特殊的发泡材料,具有许多独特的力学性能.根据聚碳酸酯微孔泡沫塑料的拉伸实验数据,对材料的拉伸力学性能进行了研究,讨论了密度、应变率等因素对微孔泡沫塑料拉伸应力-应变关系的影响,并基于Boltzmann叠加原理利用松弛模量对拉伸应力-应变曲线进行了本构关系的拟合,得到了比较满意的结果.Abstract: Microcellular plastics is a kind of special foamed plastic with some unique mechanical properties. On the basis of tensile test data of microcellular polycarbonate, some mechanical properties are investigated in this paper, including the effects of density and strain rate on the tensile stress-strain curves. Finally, the numerical fits to tensile constitutive relation of microcellular polycarbonate are performed by means of Boltzmann's principle and relaxation modulus. A good agreement between theoretical prediction and experimental data is obtained.
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Key words:
- constitutive relation /
- strain rate /
- microcellular plastics /
- mechanical properties
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[1] Shimbo M, Baldwin D F, Suh N P. The viscoelastic behavior of microcellular plastics with varying cell size[J]. Polym Eng Sci, 1995, 35(17):1387~1393 [2] 卢子兴. 微孔泡沫塑料力学行为的研究综述[J]. 力学进展, 2002, 32(3):365~378 Lu Zixing.A review of studies on the mechanical behavior of microcellular plastics[J].Advances in Mechanics, 2002, 32(3):365~378(in Chinese) [3] 卢子兴. 聚碳酸酯微孔泡沫塑料及其基体材料的拉伸力学性能[J]. 中国塑料, 2002,16(9):53~56 Lu Zixing.Tensile mechanical properties of polycarbo-nate and microcellular polycarbonate[J].China Plastics, 2002,16(9):53~56(in Chinese) [4] Miltz J, Ramon O, Mizrahi S. Mechanical behavior of closeed cell plastic foams used as cushioning mate-rial[J]. Appl Polym Sci,1989,38:281~290 -
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