On the Residual Stress due to Rotary Bending of Steel

Abstract

This is the report of an experiment made of the residual stress induced by rotary bending of steel. As in the 1st report, four stress levels above and below the fatigue limit are applied repeatedly, and the residual stress of some specimens in the course of stressing has been measured by the X-ray method. Also, the specific volume in each part of these specimens has been measured. Then, the change of distribution of residual stress during stress repetition has been investigated.
Stressed at a stress level below the fatigue limit the residual stress induced showed but little change. But stressed at a level above the fatigue limit, the residual stress showed considerable changes. This may be the result of the change of the specific volume at each part which goes into inner layers in succession from the outer layer, causing the compressive residual stress.