Stress rolling - a method inducing great amounts of compressive residual stresses
Eckehard Müller, Hochschule Bochum, Bochum, Germany
To increase the residual stresses in the shot peening process, stress peening has been established. In a wide range it is used at leaf- and coil springs. Under stress peened springs have longer fatigue strength compared to normal peened springs, because after peening the unloading of the springs the residual stress is increased. This method is transferred to deep rolling. Deep rolling has a asymmetric residual stress distribution at the surface. Perpendicular to the rolling direction the compressive residual stress is nearly twice as high compared to the rolling direction. Under stress rolling a symmetric residual stress distribution can be achieved in all polar angles at the surface. In the depth the compressive residual stress distribution is also signifikant increased.
Session W3: Wednesday, 27 June 2018
End: 03:30 p.m.