论文标题

粘弹性弹性体的“纯剪切”断裂测试及其对格里菲斯裂缝的启示

The "pure-shear" fracture test for viscoelastic elastomers and its revelation on Griffith fracture

论文作者

Shrimali, Bhavesh, Lopez-Pamies, Oscar

论文摘要

令人惊讶的是,“纯剪切”断裂试验反复表明(常见的碳氢化合物和其他类型的)粘弹性弹性体中的断裂成核发生在临界拉伸处,这与进行测试的拉伸速率无关。在这封信中,我们证明了这种非凡的临界条件,这意味着,在粘弹性弹性体中,裂缝构成骨折的格里菲思临界条件实际上可以写成是一种表达,这不是一种表达方式,而不是一种表达,而不是在依赖于难以依赖的临界型撕裂的能量的情况下,而是在某种程度上进行的,而不是在某种程度上进行的,而不是在某种程度上进行的,而不是在某种程度上进行的,而不是在某种程度上进行的,而不是在某种程度上进行的,则是一种表达。弹性体。

Strikingly, "pure-shear" fracture tests have repeatedly shown that fracture nucleation in (common hydrocarbon and other types of) viscoelastic elastomers occurs at a critical stretch that is independent of the stretch rate at which the test is carried out. In this Letter, we demonstrate that this remarkable -- yet overlooked -- experimental finding implies that the Griffith criticality condition that governs nucleation of fracture from large pre-existing cracks in viscoelastic elastomers can be written in fact as an expression not in terms of an elusive loading-history-dependent critical tearing energy Tc, as ordinarily done, but as one exclusively in terms of the intrinsic fracture energy Gc of the elastomer.

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