粘弹性固体中裂纹扩展的速度跳跃

IF 1.3 4区工程技术 Q3 MECHANICS

Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI:10.1678/rheology.50.99

N. Sakumichi

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引用次数: 0

摘要

粘弹性固体中的裂纹表现为速度跳变，即裂纹的扩展速度在施加载荷的一个小范围内突然变化。然而，这一机制直到最近才得到解决。本文综述了粘弹性固体中速度跳变的研究成果，重点介绍了我们的研究成果。我们已经建立了一个精确可解的模型来展示速度跳变。从数学解中，我们阐明了速度跳变是由裂纹尖端附近的动态玻璃化转变引起的。此外，我们还提供了粘弹性固体增韧的指导原则。最近，该模型的预测已被实验和数值模拟所证实。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Velocity Jump of Crack Propagation in Viscoelastic Solids

A crack in a viscoelastic solid exhibits velocity jump, i.e., the propagation velocity changes abruptly in a narrow range of the applied load. However, the mechanism had been unsolved until recently. This review introduces past findings on velocity jumps in viscoelastic solids, focusing on our studies. We have developed an exactly solvable model that exhibits the velocity jump. From the mathematical solution, we have elucidated that the velocity jump is caused by a dynamic glass transition in the vicinity of the crack tip. Also, we have provided a guiding principle for toughening viscoelastic solids. Recently, the predictions of the model have been confirmed by experiments and numerical simulations.

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来源期刊

Nihon Reoroji Gakkaishi 工程技术-高分子科学

CiteScore

1.50

自引率

61.50%

发文量

审稿时长

>12 weeks

期刊介绍： For the communication among the members, the journal of the Society of Rheology Japan, NIHON REOROJI GAKKAISHI (5 issues per year), was established in 1973 and it is the oldest journal on rheology in Asia. The journal contains original and review articles on rheology and related topics, information for all SRJ events, and reports of domestic/overseas meetings. Articles in Japanese as well as in English are considered for publication, not only from the members but also from the researchers outside. Papers from new emerging areas of the field are particularly welcome. The electronic version of the articles is available via the internet with an open access policy.