Ductile Fracture Criterion for Metal Shear Spinning

doi:10.3901/JME.2018.14.066

Abstract

Abstract: Fracture is the main failure mode during shear spinning. The investigation of Oyane criterion based on constitutive mode of compression plastic deformation is proposed according to the stress state of the deformation zone during shear spinning to realize the accurate prediction of fracture. The Oyane ductile criterion is coupled to the finite element model of shear spinning of DP600 high strength steel based on the secondary development through the subroutine VUSDFLD of software, ABAQUS. The damage integral calculation of Oyane ductile criterion and the judgment of fracture threshold during shear spinning are carried out. The spinning experiment with ellipsoid mandrel is carried out to verify the simulation results of fracture prediction. The results show that the fracture position during shear spinning predicted by Oyane criterion is located in the deformed zone near the deformation zone and distributed uniformly along the tangential direction, which is in good agreement with the experimental result. However, the relative error of the maximum thinning ratio between the simulation and experiment reaches to 33.8%. Therefore, a modified ductile fracture criterion based on the Oyane criterion for fracture prediction during shear spinning is proposed by considering the influence of mean stress and maximum shear stress on the ductile damage process. The results show that the relative error of maximum thinning ratio predicted by the modified criterion is only 15.9%, which is decreased by 17.9% compared with the Oyane ductile fracture criterion. The ductile fracture criterion applied to metal shear spinning is obtained, which can provide the theoretical basis for the accurate prediction of fracture during metal shear spinning.

Key words: ellipsoid mandrel, fracture prediction, modified ductile fracture criterion, Oyane criterion, shear spinning

CLC Number:

TG306

XIA Qinxiang, ZHOU Likui, XIAO Gangfeng, CHENG Xiuquan, CHEN Weiping. Ductile Fracture Criterion for Metal Shear Spinning[J]. Journal of Mechanical Engineering, 2018, 54(14): 66-73.

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