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首页> 外文期刊>Journal of Materials Science >A theory for yield phenomenon of glassy polymers based on the strain non-uniformity under loading conditions
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A theory for yield phenomenon of glassy polymers based on the strain non-uniformity under loading conditions

机译：基于加载条件下应变不均匀的玻璃态聚合物屈服现象的理论

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摘要

In this work, the yield phenomenon and its related features have been investigated under the concept of strain inhomogeneity, emerged inside the material during deformation processes. This strain non-uniformity in glassy polymers is either a direct consequence of the local microstructural density fluctuations existing in such materials or is the result of the manner by which the free volume is frozen in the glassy state. Assuming a simple strain density distribution function, the rate of plastic deformation can be extracted without any further assumption on a molecular conformational base or any other thermal activated process. The two model parameters required have a physical base related with the magnitude of the free volume and its fluctuation in glassy polymers. Appling this theory on the experimental results for three representative amorphous glassy polymers (PMMA, PS, and PC), all features of yield process, including strain softening effect, are easily described.
机译：在这项工作中，已经在变形过程中出现在材料内部的应变不均匀性的概念下研究了屈服现象及其相关特征。玻璃态聚合物中的这种应变不均匀性要么是这种材料中存在的局部微观结构密度波动的直接结果，要么是由于自由体积以玻璃态冷冻的方式的结果。假设简单的应变密度分布函数，就可以提取塑性变形的速率，而无需在分子构象基础或任何其他热活化过程上进行任何进一步假设。所需的两个模型参数的物理基础与自由体积的大小及其在玻璃态聚合物中的波动有关。将该理论应用于三种代表性的非晶态玻璃态聚合物（PMMA，PS和PC）的实验结果，可以轻松描述屈服过程的所有特征，包括应变软化效果。

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