DETERMINATION OF DEFORMATION-INDUCED RESIDUAL-STRESSES IN FULL FORWARD EXTRUSION AND COMPARISON TO EXPERIMENTAL RESULTS

The macroscopic residual stresses induced by cold forward extrusion of rods are calculated by the finite element method. For an experimental determination of the residual stresses X-ray diffraction and neutron diffraction as well as the hole drilling method are applied. The resul ts of the experiments and the calculations are in qualitative agreemen t, those of the experiments even are in good quantitative agreement. T hey allow the investigation of the influence of the processing paramet ers. Thus, a product optimisation with respect to residual stresses is enabled.