连续损伤力学, 损伤累积, 非线性, 低周疲劳

Based on the theory of continuum damage mechanics,a new low cycle fatigue damage model was established, which combined the unseparable

characteristics of the damage variables and loading parameters. Through the analysis of test data of the low cycle fatigue damage of steel 00Cr17Ni14Mo2 and 2.25Cr1Mo,the fatigue damage evolution equations under different plastic strain amplitudes were acquired,which are in good agreement with the experimental results.While the constants of new low cycle fatigue damage model were obtained by fitting,two fatigue damage evolution equations of steel 00Cr17Ni14Mo2 and 2.25Cr1Mo were given respectively.And comparing with several fatigue damage accumulation models,the results show that except linear damage accumulation model,the rest of the models could reflect the nonlinear damage accumulation process of material.The new model established herein accords the experimental results best, which truly reflects the nonlinear damage accumulation process,and takes the coupling of damage and strain, fatigue limit, mean pressure into consideration.Therefore, the new damage model has a clear physical meaning and practical value.