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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (12): 224735-224735.doi: 10.7527/S1000-6893.2020.24735

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

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

LIU Binchao1, BAO Rui1, SUI Fucheng2   

  1. 1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;
    2. AVIC Shenyang Aircraft Design and Research Institute, Shenyang 110035, China
  • Received:2020-09-10 Revised:2020-10-29 Published:2020-11-06
  • Supported by:
    National Natural Science Foundation of China (12172022)

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: