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Numerical method for estimating fatigue crack initiation size using elastic–plastic fracture mechanics method

Wang, Haijie ; Liu, Xintian ; Wang, Xiaolan ; Wang, Yansong

Applied Mathematical Modelling, 2019-09, Vol.73, p.365-377 [Periódico revisado por pares]

New York: Elsevier Inc

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  • Título:
    Numerical method for estimating fatigue crack initiation size using elastic–plastic fracture mechanics method
  • Autor: Wang, Haijie ; Liu, Xintian ; Wang, Xiaolan ; Wang, Yansong
  • Assuntos: Crack initiation ; Crack propagation ; Cumulative damage ; EPFM method ; Fatigue crack initiation size ; Fatigue failure ; Fatigue life ; Feasibility studies ; Fracture mechanics ; Miner rule ; Numerical methods ; Short cracks ; Symmetric cyclic torsional alternating stress
  • É parte de: Applied Mathematical Modelling, 2019-09, Vol.73, p.365-377
  • Descrição: •Calculation method of crack initiation size is improved by basic model of fatigue crack initiation size.•The elastic–plastic fracture mechanics (EPFM) method is used to study the short crack fatigue life.•The calculation model of fatigue crack initiation size is established by symmetric cyclic torsional alternating stress.•The feasibility of EPFM method is verified by comparing with the crack initiation size. To solve the fatigue crack initiation problem, it is necessary to calculate the fatigue crack initiation size. According to the aspect of macroscopic crack development, the calculation method of crack initiation size is determined by the critical dimension of fatigue crack initiation. Simultaneously, the elastic–plastic fracture mechanics (EPFM) method is used to study short crack fatigue life by considering the cumulative damage rule of crack initiation life, and the calculation model of fatigue crack initiation size caused by symmetric cyclic torsional alternating stress is established under low strain. The crack initiation dimension of component is estimated, which lays a foundation for the study of fatigue life. Then the feasibility of this method is verified by comparing with the crack initiation size, which is determined by predicting the non-propagating crack size (NPCS).
  • Editor: New York: Elsevier Inc
  • Idioma: Inglês
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