• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2024, Vol. 60 ›› Issue (20): 120-133.doi: 10.3901/JME.2024.20.120

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Two-scale Analysis of High-cycle Fatigue Damage Based on Intrinsic Dissipation Theory

ZHANG Wei, LI Rujun, GE Shitao, PENG Yan   

  1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004
  • Received:2023-10-11 Revised:2024-04-05 Online:2024-10-20 Published:2024-11-30

Abstract: The high-cycle fatigue cracks of metal components start from some internal grains. The classical phenomenological damage theory can not reveal the damage morphology and evolution process on the micrograin scale, and it is difficult to establish a true description of the damage. Based on the intrinsic dissipation theory of phenomenological damage mechanics and the Lin-Taylor hypothesis, a microplastic dissipation potential was established to characterize the irreversible strain dissipation of grains, and the macroscopic equivalent characterization of the cumulative plastic strain of grain size was obtained by using the microscopic integral idea, and a two-scale model of high-cycle fatigue damage evolution was further established. The model is suitable for uniaxial, multi-axial proportional and multi-axial non-proportional loading conditions, considering both the cyclic characteristics of damage driving force and the single-bilateral effect of crack closure behavior. The load condition of the component is realized by ABAQUS, and the damage driving force is calculated by UMAT subroutine. Finally, the experimental data of aluminum alloy LY12CZ, 5% chromium steel and C35 steel used in aviation industry under different loading paths are used to evaluate and verify the proposed two-scale model. The results show that the new model has a good life prediction effect. The new model reveals the main relationship between micromechanical behavior and phenomenological damage evolution, and provides a new way to solve complex mechanical problems involving multi-scale behavior such as fatigue damage and failure of metal materials.

Key words: high cycle fatigue, intrinsic dissipation, cumulative plastic strain, the double scale, life prediction

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