AN EXPERIMENTAL STUDY OF VELOCITY DISTRIBUTION IN FORMED MATERIAL

In this paper velocity fields in forward extruded specimens of copper alloy CuCrZr are analysed using the visioplasticity method. The visioplasticity method is used to find the complete velocity and strain rate distributions from the experimental data by the finite-difference method. Knowing the values of strain rates in plastic region of the material is very important for calculating stresses and prediction of specimen quality. Comparison is made between velocity distributions in the specimens extruded with three different lubricants with different coefficients of friction. The results in a form of diagrams have shown that the influence of the lubricant on the velocity distributions in extruded material can be of great importance especially in some critical regions in the cold formed material.