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《Journal of Xi'an Jiaotong University》 2018-09
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Investigation on Mixed-Mode Fatigue Crack Growth Driven by Configurational Force

WU Zhihong;WANG Fangwen;LIU Ran;LI Qun;State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi'an Jiaotong University;School of Aerospace,Xi'an Jiaotong University;  
An innovative fatigue model is proposed by following the fracture criterion associated with the material configurational force,which is applicable for estimating the more general mixedmode crack problems under cyclic loading,corresponding the mixed-mode crack deflection angle.Moreover,the proposed model can predict the fatigue residual lifetime.The mixed-mode fatigue crack propagation model is constructed following the theory of material configuration mechanics,and a finite element program of the theoretical fatigue model for fatigue crack propagation simulation is developed.The configurational force criterion is adopted to numerically analyze both the pure mode I and I-II mixed-mode crack propagation,and the lifetime and propagation paths are predicted.The numerical results coincide well with the experimental ones.To research the general mixed-mode fatigue crack propagation in actual engineering structures,the fatigue behavior of metal plate with an edge crack or a circular hole is considered as an example.It isfound that the inclined crack angle and the relative position of circular holes with respect to the major crack have significant influences on the crack deflection and residual fatigue lifetime.For the plane metal plate with inclined edge crack,larger inclination angle leads to a longer residual lifetime.Besides,due to the interaction between the hole and crack,the crack propagates towards the hole.Particularly,there exist a certain distance between the hole and crack,at which the propagation rate reduces and the crack may be inhibited.
【Fund】: 国家自然科学基金资助项目(11472205 11772245)
【CateGory Index】: O341;O346.1
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