The investigation of internal stress fields by stress reduction experiments

The decomposition of stress applied on a material into two distinct parts called effective and internal stresses is often assumed but rarely experimentally measured. The strain-dip test technique, used occasionally in creep testing, is employed here for the investigation of the two stress components under conditions of constant strain-rate compression tests for four different single crystalline materials. The Cottrell–Stokes law, i.e. the linear dependence between applied and effective stresses, is verified in the case of metallic specimens while the effective stress depends only slightly on the applied stress in the case of germanium.