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International Society of Science and Applied Technologies |
| Study on Multi-Crack Growth Rate Based on Elastic-Plastic Mechanics | ||||
| Author | Ruijin Zhang
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| Co-Author(s) | Lei Wang; Youzhi Pei; Binbin Hu
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| Abstract | In this paper, different multi-crack samples were designed and the crack growth experiment was conducted by using fatigue testing machine. The driving parameters of crack growth under cyclic loading were studied, and incremental plastic J-integral Jep was considered as the driving parameters of crack growth under elastoplastic mechanics. The ΔJep was calculated by finite element method (FEM), and the growth rate curves of multiple crack were compared with the growth rate curve of single crack. The material plasticity data were used to establish an elasticplastic finite element model, a stress contour of the crack length at the critical point was obtained. Research has shown that for aluminum alloy materials, it is reasonable that the penetration of the plastic zone at the crack tip was used as a failure criterion for multiple crack propagation.
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| Keywords | Multiple crack growth rate; Elastic-plastic mechanics; J-integral; Plastic zone connection | |||
| Article #: RQD2024-93 | ||||
Proceedings of 29th ISSAT International Conference on Reliability & Quality in Design |