一种引入材料循环本构的单轴疲劳平均应力模型

doi:10.7527/S1000-6893.2020.24735

Abstract

Abstract: To precisely consider the effects of mean stress in evaluating uniaxial constant-amplitude fatigue lifetime, this paper proposes a mean-stress model on the basis of driving-force models, and the main idea of proposed model is to introduce material cyclic constitutive. Qualitatively, the model is capable of describing the shapes of constant-life curves for various materials in broader range of given fatigue lifetime as well as cyclic stress ratio; quantitatively, the model is capable of predicting fatigue lifetime under other cyclic stress ratios with satisfying agreements. Moreover, a method to obtain model parameters is also proposed, which further reduces test costs while ensuring the reliability of fitted data. The proposed mean-stress model possesses the potential to provide supports for compiling handbooks of material fatigue properties, and to offer guidelines for improvements of relevant engineering approaches.

Key words: mean-stress effects, fatigue life, constant-life diagram, fatigue driving force, material cyclic constitutive

CLC Number:

V215.5

LIU Binchao, BAO Rui, SUI Fucheng. A mean-stress model including material cyclic constitutive in uniaxial fatigue[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(12): 224735-224735.

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A mean-stress model including material cyclic constitutive in uniaxial fatigue

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