Micro-mechanism on the Metal Materials with the Fatigue Propagation

Low stress failure due to fatigue is one of the most common and common forms of component failure. Especially for aerospace and Aeronautical products, the system structure is complex, the environmental conditions are complex, the application of new technologies and materials is significant, and the investment of a single product is high. Therefore, the abnormal low stress damage of individual structures often causes catastrophic losses. In practice, most of the components with defects are not easy to find because of the stress damage caused by the continuous crack growth under fatigue load. Therefore, the study of fatigue crack and growth rate has great practical significance. In this paper, the general law and microscopic mechanism of crack growth of metal structural materials under normal temperature and transverse fatigue load are studied.