Crack propagation in a rod in alternating plastic bending

Abstract

An experimental and theoretical study is made of crack propagation during the alternating plastic bending of notched circular rods of steel 35, copper, and aluminum. It is shown that a crack in this case grows by the merging of separate defects. Damages are accumulated in each bending cycle at a rate which depends exponentially on the number of cycles and the amplitude of the bending strain. Practical recommendations are given for separating ductile rolled products into measured lengths by bending.