THE MEAN FATIGUE LIFE CURVES FOR DIFFERENT COEFFICIENTS OF STRESS CONCENTRATION BASED ON DAMAGE MECHANICS
推导材料不同$K_t $中值疲劳曲线的损伤力学方法

The mean fatigue life curves of a material can be obtained from damage mechanics.The material parameters that affect the S-N curve and the relationship between them are obtained.The mean fatigue life curves,namely,the material parameters corresponding to K_t=1.0,are obtained by using the up-down method and the group fatigue test.One needs only to use the up-down fatigue test to get the fatigue limit under any coefficient of stress concentration K_t,then,we can get the mean fatigue life curves corresponding to the stress concentration.