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[求助] 聚碳酸酯(PC)的缺口敏感性是什么缘故?

在一篇韩国人的文献中看到,说聚碳酸酯(PC)的缺口敏感性原因, The notch sensitivity of PC is due to the change in stress state at the notch from plane stress to plane strain and the resulting change in failure mechanism from shearing to crazing.

敏感性的原因是,从平面应力到平面应变,造成缺口处的应力变化。“从平面应力到平面应变”是什么意思?
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