Fatigue life includes crack initiation life and crack growth life. Existing models generally only predict crack initiation life. Glidcop material has good ductility and strong crack growth resistance, but a model to predict its crack growth life has not yet been proposed. Thirdly, the beam lines are perpendicularly incident during the thermal fatigue experiment, and the effects on energy absorption and shape change of the irradiation area during actual grazing incidence have not been investigated. Finally, the effects of the non-isocyclic periodicity of light loading and the smoothness of the surface of the specimen on the fatigue life of the specimen have yet to be studied.
In the research of the above key issues, experimental testing and characterization of material fatigue failure are the basis. The effective development of numerical simulation is an indispensable means. It permeates almost every aspect of the research, and often provides more abundant than the experiment. Information and details. Study the mechanical properties of Glidcop materials, especially the low cycle fatigue properties. Fatigue design criteria depend on material fatigue parameters, and fatigue parameters cannot be obtained without fatigue experiments. Larger dispersion is an inherent property of fatigue experiments. The fatigue performance of Glidcop material is not only related to the size, shape, manufacturing process and processing technology, but also to the experimental means and experimental conditions. The results obtained by different scholars are often quite different. At the same time, due to the fact that materials often work in high-temperature environments, and the low-cycle fatigue testing of materials at high temperatures is currently carried out less, relevant data are scarce. Deepen the understanding of the failure mechanism of Glidcop material under the action of thermal load. The local area is subject to high thermal load, and the temperature gradient occurs in this area and the surrounding area.
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