Interaction Behavior and Combination Rules of Two Through-wall Cracks under Tensile Loading

doi:10.3901/JME.2023.02.113

Abstract

Abstract: The propagation and coalescence of multiple cracks significantly affect the remanent strength and service life of components. Tensile tests on plate specimens with two unequal through-wall cracks with different lengths and relative positions,together with corresponding finite element analysis based on a ductile damage model, are carried out to obtain the patten of crack coalescence. The results show that the crack opening displacement, propagation and coalescence behavior in numerical simulations are consistent with those in the experimental results. In addition, it is found that the variation of the length and relative positions of the two unequal through-wall cracks markedly affects the stress triaxiality distribution at the crack tip, which further affects the coalescence behavior of two cracks. Through a large number of numerical simulations, a new combination rule based on crack length and relative position is proposed. Based on the comparison with the results of 71 groups of tests and 274 groups of simulation results,it is found that the values of prediction accuracy of the new combination rule for the two types of tests are up to 84.5% and 91.2%,respectively. The proposed crack combination rule under tensile loading not only has a significantly higher accuracy than the combination rules in the current safety assessment standards for structures containing defects, but also has a necessary conservativeness, which can provide an effective judgment on whether the multiple cracks in components merge or not.

Key words: multiple cracks, crack interaction, combination rule, ductile fracture, finite element analysis

CLC Number:

TH114

QI Lei, FEI Jiawen, WEN Jianfeng, TU Shantung. Interaction Behavior and Combination Rules of Two Through-wall Cracks under Tensile Loading[J]. Journal of Mechanical Engineering, 2023, 59(2): 113-126.

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