Otmar Vöhringer

TL;DR: In this article, a constitutive expression for the twinning stress in BCC metals is developed using dislocation emission from a source and the formation of pile-ups, as rate-controlling mechanism.

TL;DR: In this article, the response of metals to high-strain-rate deformation is successfully described by physically-based mechanisms which incorporate dislocation dynamics, twinning, displacive (martensitic) phase transformations, grain-size, stacking fault, and solution hardening effects.

TL;DR: In this paper, shot peening induced residual stresses in normalized condition and in quenched and tempered condition of the steel AISI 4140 (German grade 42 CrMo 4) were investigated in annealing experiments, quasistatic loading experiments and bending fatigue experiments at 25, 250 and 400°C.

TL;DR: In this paper, the effects of shot peening and peening at elevated temperatures on the characteristics of regions close to the surface, on the stability of residual stresses and half widths of X-ray interference lines and on the fatigue strength are presented for a quenched and tempered AISI 4140 steel (German grade 42CrMo4).

TL;DR: In this article, a new method for the analysis of multiaxial residual stress states is presented, which is based on high resolution neutron diffraction, analogous to X-ray stress analysis, but the use of neutrons instead of X-rays allows to analyse the stress distributions also in the interior of technical components in a non-destructive way.