TY - JOUR AU - Malikova, Lucie AU - Simonova, Hana AU - Kucharczykova, Barbara AU - Miarka, Petr PY - 2019/06/25 Y2 - 2024/03/29 TI - Multi-parameter fracture mechanics: Crack path in a mixed-mode specimen JF - Frattura ed Integrità Strutturale JA - Fra&IntStrut VL - 13 IS - 49 SE - SI: Characterisation of Crack Tip Fields DO - 10.3221/IGF-ESIS.49.07 UR - https://www.fracturae.com/index.php/fis/article/view/2491 SP - 65-73 AB - <p>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.</p> ER -