Crack initiation: A non-local energy approach

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• 作者：Costy Kodsi ^{c.kodsi.1@research.gla.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Brittle fracture ; Fracture criteria ; LEFM ; Topological derivative ; PMMA
• 刊名：Engineering Fracture Mechanics
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：165
• 期：Complete
• 页码：153-182
• 全文大小：1523 K

文摘

A crack initiation criterion is proposed for brittle material where nucleation is treated as a sudden and discrete rupture event at the macroscopic level. At the heart of the criterion is the finite difference form of the energy release rate; an expression for the characteristic length is derived and the change in total potential energy is obtained from an asymptotic argument. The criterion can predict crack onset at a sharp or blunt notch. Fracture toughness and material strength are the only input requirements. The effectiveness of the criterion is demonstrated through predictions that are compared to experimental data.