Residual stresses have a wide range of causes. These include, for example, inhomogeneous heat dissipation, heat treatment, grinding, grit blasting, nitriding or polishing.
On site, we measure the residual stresses for you using the hole-drilling method. The evaluation – and hence the determination – of the residual stresses is performed both according to ASTM E 837 (by means of which an “average” residual stress is determined over the entire depth of the drill hole) and in accordance with “Kockelmann”, where the residual stress distribution is determined down to a drilling depth of one millimeter. These services are rounded off by investigations into the causes and proposed measures.
Residual stresses are mechanical stresses that are present in a component or material without external forces and moments acting on the component. They arise from the interaction of volume changes occurring within certain material areas and their obstruction by the surrounding areas.