ショットピーニング浸炭歯車の残留応力の推定および応力拡大係数に対する影響

抄録

A method is proposed for the estimation of the residual stress due to shot peening in carburized gears. Influences of the martensitic transformation of retained austenite and the strain induced at the tooth surface are considered, and the residual stress is estimated from the difference in volume expansion between the case and the core. The estimated residual stress is close to the stress measured by the X-ray method, though it is overestimated at the surface. The stress intensity factor is calculated by the influence function method, and the reduction of the factor due to the residual stress is demonstrated and discussed.