Failure analysis in disc shear based on Gissmo criterion

To investigate the failure process of the strip during the shearing process of the disc shear, the forces acting on the upper shear blade of the disc shear, and the influence of various factors on the stress of the upper shear blade and the quality of shear section, a three-dimensional model of the disc shear was established based on the finite element method, and the Gissmo material failure criterion was introduced to analyse the stress of the upper shear blade and the quality of shear section under different lateral clearances, overlaps, and upper shear blade angles. The results demonstrate that the upper shear blade angle has the most significant impact on the stress of the upper shear blade, but has a marginal effect on shear section quality. Both the stress of the upper shear blade and the quality of shear section decrease with an increase in the upper shear blade angle. The lateral clearance has a certain impact on the stress of the upper shear blade, but its effect on quality of shear section is most significant. When the lateral clearance is 0.5 mm, the stress on the upper shear blade is minimized, but the quality of shear section is the poorest. The overlap has a negligible effect on both the stress of the upper shear blade and the quality of shear section in circular disc shearing. Finally, the simulation results are compared with actual production data, and it is found that the simulation results are basically consistent with the overall trend of actual results. In addition, the results of the model using the Gissmo failure criterion for the stresses on the shear blade are closer to the actual results than the results of the model using the constant strain failure criterion.