Multi-parameter fracture mechanics: crack path in a mixed-mode specimen

0510647 - ÚFM 2020 RIV IT eng J - Journal Article
Malíková, L. - Simonová, H. - Kucharczyková, B. - Miarka, Petr
Multi-parameter fracture mechanics: crack path in a mixed-mode specimen.
Frattura ed Integrita Strutturale. Roč. 49, JUL (2019), s. 65-73. ISSN 1971-8993
Institutional support: RVO:68081723
Keywords : Crack-tip field * Multi-parameter fracture mechanics * Finite element analysis * Mixed-mode * Williams' expansion
OECD category: Civil engineering
Method of publishing: Open access
https://www.fracturae.com/index.php/fis/article/view/2491/2632

A mixed-mode geometry has been chosen to investigate a crack propagation using the multi-parameter fracture mechanics concept. The so-called Williams' series expansion is used for the crack-tip stress field approximation. It has been shown that application of the generalized fracture mechanics concept can be crucial for materials with specific fracture behaviour, such as elastic-plastic or quasi-brittle one, when fracture occurs not only in the very vicinity of the crack tip, but also in a more distant surrounding. Then, considering the higher-order terms of the Williams' expansion in fracture criteria (describing the crack stability and/or crack propagation direction) can bring more precise results. The coefficients of the Williams' expansion must be calculated numerically (for instance by means of the over-deterministic method in this work) for each cracked configuration, which is very time-consuming, and the analysis is very extensive even for a few basic cracked specimen configurations. On the other hand, a suitable choice of the geometrical configuration of the cracked disc enables performing experiments only on the specimens that could prove the theory about the importance of using the higher-order terms.
Permanent Link: http://hdl.handle.net/11104/0301145