Author(s)

R.T. Ogeman

Abstract

Residual stresses and crack propagation after coining of holes in aluminium plates: finite element calculations and verifying experiments R.T. Ogeman Division of Marine Structural Engineering, Chalmers University of Technology, S-412 96 Goteborg, Sweden ABSTRACT Stress coining is a surface treatment method used to generate tangential compressive stresses on the bore of a hole. The plate containing the hole to be coined is placed between two steel mandrels which are pressed together. In this paper, it is shown that the complex and nonlinear process, stress coining, can be simulated successfully by use of the finite element method (FE-method). The build-up of stresses and strains in a 25 mm thick aluminium plate during coining is simulated and experiments are performed to verify the calculations. Resistance foil strain gauges were used to record the strains on the bore of a 27 mm diameter hole during the coining process. Good agreement was observed. The fatigue crack

Keywords