Physically short fatigue crack growth from notch described by plasticity-corrected stress intensity factor
作者： Li Meng , Menghao Yang , Xiuhua Chen , Yandong Hu , Miaolin Feng
DOI: 10.1016/J.IJMECSCI.2020.105544
关键词: Power function 、 Growth rate 、 Tension (physics) 、 Paris' law 、 Materials science 、 Significant difference 、 Composite material 、 Plasticity 、 Numerical analysis 、 Stress intensity factor
摘要: Abstract When a physically short fatigue crack propagates from notch root, the growth rate shows “V-shaped” behavior; i.e., firstly decreases and then increases as propagates. In this study, plasticity-corrected stress intensity factor (PC-SIF) is applied to describe effects of both notch's plastic zone crack-tip's in ductile materials under cyclic loading. Experiments previous study for disk-shaped compact tension (CT) specimens made 1070 steel with different sizes load ratios, well single-edged low-carbon U-shaped notches, are examined by numerical analysis present paper. The V-shaped curves data can be summarized straight lines if PC-SIF range which considers influence near roots. root plays an important role behavior crack, evolution discussed detail. ratio (SIF) was fitted power functions fitting expressions before after turning point curve exhibit significant difference.
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