抄録
Carbon steels are used in many fields of industries because of their good properties and low cost. These materials are generally utilized as the structural steels after receiving the plastic deformation such as tension or bending. Therefore, it is important to evaluate the effect of pre-strain on the fatigue strength of structural steels. In this study, the fatigue tests have been performed to investigate the fatigue strength of pre-strained structural carbon steel using Ono-type rotary bending fatigue testing machine. The main results obtained in this study are as follows; (1)The fatigue strength of small pre-strained specimen is lower than that of non-pre-strained one. (2)The fatigue strengths of pre-strained specimens increase with increase of pre-strain value. (3)The fatigue strengths of pre-strained specimens increase after annealing.
