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Void growth and damage ahead of a crack in pressure-sensitive dilatant polymers

机译：在压敏膨胀剂聚合物的裂缝前方的空隙生长和损坏

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The deformation of amorphous polymers is highly sensitive to hydrostatic pressure and the plastic flow is non-volume preserving. Failure of these materials is often preceded by the formation of small crack-like defects known as crazes, bridged by the fibrils of the polymer. In this work, a population of discrete voids is placed ahead of a crack within a boundary layer configuration to study the effects of pressure-sensitivity α and plastic dilatancy β on void growth and damage in polymeric materials. Results show that high pressure-sensitivity significantly increases both the intensity and spatial extent of damage, which could promote crazing. These effects can be compounded as the deviation from the associated flow rule, |β - α|, increases. This study offers some evidence of pressure-sensitivity and plastic dilatancy as the major contributing parameters to the formation and growth of microporous crazing zones in polymers.
机译：无定形聚合物的变形对静液压压力高度敏感，塑料流是不容积的。这些材料的失效通常在形成诸如裂纹的小裂纹状缺陷，由聚合物的原纤维桥接。在这项工作中，将离散空隙的群体放置在边界层配置内的裂缝前，以研究压敏度α和塑料稀释性β对聚合物材料的空隙生长和损伤的影响。结果表明，高压敏率显着提高了损害的强度和空间程度，这可能促进裂缝。这些效果可以复合为与相关流量规则的偏差，|β - α|增加。本研究提供了一些压力敏感性和塑料稀释剂的证据，作为聚合物中微孔裂缝区的形成和生长的主要贡献参数。

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