1039 ショットピーニングによる鋼の疲労限度向上と表面欠陥の無害化(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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Effects of shot peening on the bending fatigue limit of steel specimens (SUP9A) containing an artificial small slit which are simulated as surface crack were investigated. Shot peening (SP) and stress shot peening (SSP) were conducted on the specimens containing a semi-circular slit whose depth is 0.1,0.2 and 0.3mm. Then, bending fatigue tests were conducted on the specimens. The fatigue limits of specimens containing a semi-circular were increased by SP SSP. The shot peened specimens containing a semi-circular slit whose depth is under 0.2 mm fractured outside the slit, 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 a semi-circular slit whose depth is under 0.2 mm determined by the threshold condition for non-propagation of fatigue cracks emanated outside the slit. From these results, it was clear that a semi-circular slit under 0.2 mm could be made acceptable by SP and SSP.
社団法人日本機械学会の論文
2008-08-02