A fatigue life prediction model of multi-axial notched specimens with notch effect

Abstract

Abstract: In order to study the multi-axial fatigue of notched specimens, based on the theory of damage mechanics and the idea of von Mises equivalent rule, a multi-axial damage constitutive equation considering notch effect was established, which comprehensively considers the effect of normal stress and shear stress in the multi-axial damage process; and further, a multi-axial fatigue life prediction model that can be applied to metal notched parts was proposed in this paper. The model was evaluated by the multi-axial notched fatigue test data of GH4169 nickel-based superalloy, SAE1045 steel and LY12CZ aluminium alloy. The results show that the multi-axial fatigue life predicted by the proposed model was in good agreement with the test results, and the prediction accuracy was significantly improved compared with the traditional local stress strain approach. At the same time, the model is easy to calculate and is convenient for engineering application.

Key words: damage mechanics, notch effect, multi-axial fatigue, life prediction, von Mises equivalent rule

CLC Number:

TH114

LIU Jian-hui, PAN Xue-mei, LU Xin, ZI Rong, CHEN Xiao-chuang. A fatigue life prediction model of multi-axial notched specimens with notch effect[J]. Journal of Lanzhou University of Technology, 2021, 47(6): 56-60.

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