| Numerical and experimental studies of equal-channel angular pressing was carried out to verify theoretical deformation models. Finite element method was used to calculate the grid deformation and the effective plastic strain field with various die shapes. When the curvature angle is zero, a homogeneous shear deformation occurs on the cross section of the specimen, which is well predicted by the theoretical models. As the curvature angle increases, the shear deformation is found to be comparatively uniform at the upper part of the specimen, and the effective plastic strain is in a good agreement with the theoretical value. However, the shear deformation at the lower part of the specimen becomes smaller, and the effective plastic strain is considerably different from the theoretical result. Model experiments using plexiglass molds and plasticine billets supported well with the results of the finite element analysis. |
|
