There are numerous notches in structural connections and even microstructures,and stress concentration near the notches can significantly reduce the load-bearing capacity of the structure,seri-ously affecting its fatigue performance.This paper focuses on the research of notch stress field and fa-tigue evaluation method of composite structures with notches,deduces the semi-analytical simple for-mula of V-notch stress field of composite materials with initial cracks,and verifies the simple formula through experiments.It is verified that the simple formula can effectively reflect the stress situation of components,which shows that the simple formula introduced in this paper can accurately predict the stress field and stress intensity factor at the root of notches.Finally,based on the experimental data of crack propagation in V-notch plates,combined with Pairs formula and stress field simplified evalua-tion formula,a crack propagation model for anisotropic materials with bilateral V-notch components containing initial cracks was fitted.
关键词
各向异性材料/初始裂纹/切口应力场/应力强度因子/裂纹扩展模型
Key words
anisotropic materials/initial crack/notch stress field/stress intensity factor/crack propa-gation model
维普
万方数据