Influence of hydrostatic pressure and volumetric strain on the mechanical long term behavior of polymers
Influence of hydrostatic pressure and volumetric strain on the mechanical long term behavior of polymers
复制标题
静水压力和体积应变对聚合物机械长期行为的影响
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Stommel
中科院分区：
文献类型：
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作者：
T. Naumann;M. Stommel
摘要在建立描述聚合物长期行为的材料模型时，最关键的问题之一是充分地表示所考虑材料的载荷依赖性。在许多出版物中，自由体积影响聚合物的力学行为。为了进一步研究蠕变行为对自由体积的依赖性，本文提出了不同的实验。在一个实验中，比较了拉伸和剪切下的蠕变行为，以了解这些测试中不同的静水压力如何影响机械行为。此外，还进行了不同静水压力下的拉伸蠕变试验。实验在聚碳酸酯、聚丙烯和聚甲基丙烯酸甲酯上进行。结果表明，静水压力对所有三种材料的蠕变行为有显着的影响。这种效应与自由体积的变化有关。
Abstract One of the most crucial issues in developing a material model to describe the long term behaviour of polymers is to represent adequately the load dependency of the considered material. In many publications, it is shown that the free volume affects the mechanical behavior of polymers. For a further investigation of the dependency of the creep behavior on free volume, different experiments are presented in this paper. In one experiment, the creep behavior under tension and shear are compared, to see how the different hydrostatic pressures in these tests influence mechanical behavior. Furthermore, tensile creep tests under different hydrostatic pressures are conducted experimentally. The experiments are conducted on a polycarbonate, a polypropylene and a polymethyl methacrylate. It is shown that the hydrostatic pressure has a significant influence on the creep behavior of all three materials. This effect is related to the change of free volume.