期刊
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
卷 106, 期 -, 页码 513-527出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.enganabound.2019.06.008
关键词
Boundary element method; Closure model; Fatigue crack propagation; Digital image correlation
资金
- National Council for Scientific and Technological Development (CNPq)
- Sao Paulo Research Foundation (FAPESP)
- Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES)
- Air Force Office of Scientific Research [FA9550-18-1-0113]
A general procedure is applied to analyze fatigue crack propagation in isotropic materials under mixed mode conditions, the Paris law modified by a closure concept. The dual boundary element method (DBEM) provides an stress and strain analysis on the solid, with reliable results for the mechanical fields in the region near to the crack tip. For validating purposes, thin plates made of 2024-T3 aluminum alloy are used with two horizontal notches. Throughout the J-Integral the stress intensity factors (SIFs) can be evaluated and with digital image processing, the displacement information from the experimental tests is obtained. Then, the effect of the crack closure during unloading is considered to attain remarkable numerical results compared to those experimentally collected, showing the feasibility of the proposed model.
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