M&M材料力学カンファレンス
Online ISSN : 2424-2845
セッションID: OS1603
会議情報
OS1603 AL合金の軸荷重下における高サイクル疲労特性に及ぼす二段多重変動荷重の影響
松村 隆山田 浩二越智 保雄佐野 雄二足立 隆史
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会議録・要旨集 フリー

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The axial fatigue tests with constant load and stress rations of -1.0 and 0.1 were conducted in order to investigate the effects of the laser peening (LP) treatment on the fatigue strength and the fatigue crack behaviors in the rolled aluminum alloy A7050 for aircraft structures. The LP treatment was effective for fatigue strength improvement in the fatigue lives before 2〜3×10^6 cycles, but the treatment reduced the strength after the cycles at the both stress ratio conditions. Fatigue cracks initiated at the surface on the higher stress amplitude levels, but the cracks initiated in the internal positions on the lower stress levels. Next, the axial fatigue tests with repeated two-step loading and stress rations of -1.0 were conducted in order to investigate the effects of the LP treatment on the fatigue strength and the fatigue crack behaviors. In the case of LP treated materials, it is found that the high stress has effect on the fatigue life but the low stress has little effect on the fatigue life.
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© 2012 一般社団法人 日本機械学会
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