CHARACTERIZATION OF RESIDUAL-STRESSES GENERATED DURING INHOMOGENEOUS PLASTIC-DEFORMATION

Residual stresses generated by macroscopic inhomogeneous plastic defor mation are predicted by an explicit finite element (FE) technique. The numerical predictions are evaluated by characterizing the residual el astic strains by neutron diffraction using two different (hkl) reflect ions. Intergranular residual elastic strains between subsets of grains are predicted numerically and verified by neutron diffraction. Subseq uently, the measured residual strain profiles in the test samples are modified by the intergranular strains and compared to the engineering predictions of the FE technique. Results compare well and verify the c apability of the numerical technique as well as the possibilities of e xperimental validation using neutron diffraction. The presented experi mental and numerical approach will subsequently be utilized for the ev aluation of more complicated plastic deformation processes resembling forming operations.