疲労破面残留応力モデルの適用検討

抄録

To investigate the applicability of the residual stress model used for the fatigue fracture surface of high hardened material SKH51 to the middle and low hardened materials, the residual stresses on the fatigue fracture surfaces of the quench-and-tempered SK-5 or SNCM439 and the annealed S15C were examined. The results obtained are summarized as follows. The residual stress on the fatigue fracture surfaces σ_r was found to be given by the sum of the same three components as that for the high hardened material; the tensile stress component, σ_r1, the compression stress component -σ_r2 and the compression component -σ_r3. The contribution of -σ_r3 was especially large in the low stress intensity factor range, and the residual stress on the fracture surface showed various distributions due to the variations of -σ_r2 and -σ_r3.