Prediction of Pure Torsion Fatigue Strength Considering Effects of Mean Shear Stress

Abstract

Abstract: Aiming at the localization of high-cycle fatigue damage, a pure torsional fatigue strength prediction model, considering the effects of mean shear stress, which was based on continuum damage mechanics was obtained from the hypothesis that the same average intrinsic damage dissipation in critical region meant the same fatigue life. Pure torsional fatigue strength related to material properties and mean shear stress was revealed, and a reasonable explanation for the academic controversy was given. The proposed prediction model was compared with existing prediction model by pure torsional fatigue experimental data of mean shear stress superimposed on three common metal materials. It is shown that the prediction accuracy of the proposed model is much better than that of the existing model.

Key words: mean shear stress, pure torsion fatigue, life prediction, intrinsic damage dissipation

摘要： 针对高周疲劳损伤局部化，基于连续介质损伤力学，将临界域均布全寿命内禀损伤耗散作为等寿命条件，导出考虑平均剪应力效应的纯扭疲劳强度预测模型。新建预测模型揭示了纯扭疲劳强度与材料属性和平均剪应力的关联性，给出了该课题学术争议的合理解释。利用常见的三种不同金属材料的叠加平均剪应力纯扭疲劳实验数据，对比论证了新建预测模型与现有预测模型的差异。预测结果表明，新建预测模型预测精度明显优于现有模型。

关键词: 平均剪应力, 纯扭疲劳, 寿命预测, 内禀损伤耗散

CLC Number:

O346.2

PENG Yan;LI Haoran;LIU Yang. Prediction of Pure Torsion Fatigue Strength Considering Effects of Mean Shear Stress[J]. China Mechanical Engineering.

彭艳;李浩然;刘洋. 考虑平均剪应力效应的纯扭疲劳强度预测[J]. 中国机械工程.

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