Visioplastic analysis of experimental rolling of steel

Abstract

A visioplastic analysis was carried out in hot rolled samples of different types of steel to study the way strain distributed during deformation. The studies were conducted on wedge-shaped specimens that were cut along their mid-plane, inscribed with a grid, spot welded at both ends and hot rolled in a two-high experimental mill. The coordinates of the nodal points in the grid were measured prior to rolling and after the samples cooled down to room temperature after deforming. This was done by photographing and digitizing the specimens, the spread that resulted from rolling was measured and used to correct the equivalent values of strain. The local components of strain were evaluated from both sets of coordinates. It was found that the distribution of strain followed different patterns, the shear and equivalent components were higher towards the surface, whereas the normal components show a distribution related to the reduction imparted.