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True stress-strain-temperature diagrams of polyolefins and their application in acceleration tests for lifetime prediction

机译:聚烯烃的真正应力 - 应变温度图及其在寿命预测的加速试验中的应用

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True stress - strain - temperature (TSST) diagrams are being used as a tool for characterizing thermo-mechanical behavior of polymers. TSST diagrams are developed for materials that undergo necking by consideration of a material point perspective. In the present work TSST diagrams of three polyolefin types, Polyethylene, PE, polypropylene, PP, and polybutylene, PB, are constructed and their relevance to accelerated lifetime testing discussed. It is found, in contrast to PE and PP, the changes in PB deformation behavior raises the issue of validity of lifetime predictions of PB at temperatures below 70 °C based on testing at temperatures above 70 °C.
机译:真正的应力 - 应变 - 温度(TST)图被用作用于表征聚合物的热机械行为的工具。通过考虑材料点的角度,开发了TST图表的用于经历颈缩的材料。在本研究的三种聚烯烃类型的第三个图中,构成了三种聚烯烃类型,聚乙烯,PE,聚丙烯,PP和聚丁烯,PB,其与加速寿命测试的相关性讨论。与PE和PP相比,PB变形行为的变化在于70℃的温度高于70℃的温度,将Pb变形行为的变化提高了PB的寿命预测的有效性。

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