首页|An Efficient Way to Characterize the Fatigue Crack Growth Based on Numerical Analysis
An Efficient Way to Characterize the Fatigue Crack Growth Based on Numerical Analysis
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The behavior of plasticity induced fatigue crack closure (PICC) in middle tension specimen was analyzed by the elastic-plastic finite element method. For the constant-K (CK) loading cases, the opening stress intensity factor K_(op) are independent of crack length. The level of K_(op)increases with the maximal applied stress intensity factor K_(max) for given load ratio R and increases with R for fixed K_(max). The K_(op) in plane strain state is much smaller than that in planestress state. The results under CK loadings can be deduced to constant amplitude cyclic loading case during which the load ratio, maximal load level, crack length and specimen thickness are all the factors affecting the crack closure effect. The phenomena revealed in the analysis are beneficial in understanding the driving force mechanism of the fatigue crack growth.
crack closurefinite element analysisconstant-K loadingopening stress intensity factor
Yazhi Li、Jing He、Zipeng Zhang
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School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
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