1040 ショットピーニングによる人工表面欠陥の無害化(J12-2 金属材料の疲労特性と破壊機構(2) 表面改質処理,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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The effects of shot peening on the fatigue limit of specimens having a semicircular slit-like artificial surface defect of varied surface length, 2a, are investigated. The fatigue limit of specimens with a slit were increased by shot peening. The fatigue limit improvement ratio of the specimen having a slit were larger than that of the slitless specimen. Shot peening is useful for materials with a surface flaw. Multiple non-propagating cracks were observed on the fracture surface. The stress intensity factor of the maximum non-propagating crack size of 470HV and 570HV specimen corresponded to that of 2a=0.52mm and 2a=0.32mm semicircular crack respectively. This result shows that semicircular cracks less than the value described above will likely to have no significant effects on the fatigue limit by shot peening and the fracture limit will be determined based on the growth limit of non-propagating cracks from the surface.
社団法人日本機械学会の論文
2008-08-02