608 人工表面欠陥を有する高強度鋼のショットピーニングによる疲労強度向上(GS.F-2 疲労)

概要

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Effects of the shot peening(SP) on the bending fatigue strength of the high strength steel specimens(SUP9A) containing an artificial small hole were investigated. After introduction a drilled hole of 0.2〜0.8mm diameter on the surface of the specimen, SP was carried out with the specimens. The fatigue strengths of specimens containing an artificial small hole were increased by SP. The specimens containing an artificial hole 0.2mm diameter which received SP fractured elsewhere the hole,and they had considerably high fatigue strengths almost equal to those of the shot peened smooth specimens.It was found that the fatigue limit of specimens having an artificial hole of under 0.2mm diameter determined by the threshold comdition for non-propagation of fatigue cracks emanated outside the drilled hole.From these results,it can be conducted that an artificial drilled hole under 0.2mm diameter could be made acceptable by SP.
一般社団法人日本機械学会の論文
2007-10-24