1208 応力ピーニングにおける予応力の効果

概要

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Since stress peening can obtain a larger compressive residual stress compared with non-stress shot peening, it has a large effect on improving fatigue strength and it is used in leaf spring. However, when remaking to the stress peening, no systematical study can be seen. It can be said that it is not clear about the mechanism. So it carried out stress shot peening's experiment about bending, simple tension and torsion by using plate specimen and round bar. It was made clear about whether what percent of loaded pre-stress was added to the residual stress, and effect of specimen's size existed. When pre-stress was removed, what percent of loaded pre-stress is added to compressive residual stress. This rate is an effect of pre-stress. Simple tension had the largest effect of pre-stress, and bending and torsion became the same result. It could be seen that effect of pre-stress tended to increase in proportion with increasing specimen's size, and after that became the saturation.
社団法人日本機械学会の論文
2003-09-23