Theory of Fatigue Crack Growth under Random Loading
According to the basic mechanics theory, we discover the mechanism of fatigue crack growth is an inertial effect, and analytically deduce a formula of the fatigue crack growth rate by importing an inertia effect coefficient on the basis of fracture mechanics. Based on above research, the problem of fatigue crack growth life under random loading converts into the superposition of equivalent amplitude fatigue under constant asymmetrical amplitude loading by applying Fourier transformation. This theory has clear mechanical concepts and concise expressions. Several cases of fatigue crack growth life tests under random loading are predicted by the theory. The results show that the predicted results are in good agreement with the test data. We successfully generalize the novel theory of fatigue crack growth under constant amplitude loading to the one under random loading and provide a reliable theoretical basis for engineering application.
Fatigue crack growth rate Fracture mechanics Inertia effect coefficient Fatigue life Random loading
Lixiong Gu Zhongyong Xu Haihua Huang Dongqing Xu
School of Traffic & Communications, South China University of Technology, Guangzhou 510640, China
国际会议
南京
英文
681-686
2007-10-16（万方平台首次上网日期，不代表论文的发表时间）