Prediction of forming limit diagram for different strain paths in crystalline FCC ideal-orientation material

The forming limit diagram is one of the efficient tools to investigate the plastic deformation ability of sheet metals. The forming limits for rate-dependent ideal-orientation crystalline materials are anticipated for the entire variety of linear and nonlinear strain paths and the stress-based forming limit diagrams are also studied. For the first time, crystal plasticity forming limit strains and stresses on the combination of different strain paths such as two-step linear paths, nonlinear strain paths, and the prestrain for an ideal orientation is examined. While the forming limit is very sensitive to the strain path, the strain path has a minor effect on stress forming limit diagrams. A rate-dependent crystal plasticity method is used in combination with the Marciniak-Kuczyniski (M-K) method to anticipate forming limits in face-centered cubic crystalline material with Goss, Cube, and Brass orientations. The results show that strain paths greatly affect the forming limits. It is further shown that in the case of an ideal orientation, forming limit stress curves are not entirely path independent.