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金属学报 1989
MICROSCOPIC RESEARCH ON IMPROVEMENT OF FATIGUE LIFE OF ALLOY LY12CZ AFTER LASER RADIATION AND ITS DAMAGE EVOLUTION
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Abstract:
对激光辐照后Ly12 CZ铝合金的疲劳寿命明显提高的原因进行了微观研究。结果表明位错胞尺寸λ在疲劳失效时都趋向于一常量λ_c。结合损伤力学建立了该材料的疲劳损伤判据及损伤演变过程,分别为: D_c=1-(λ_c/λ_0)~P D=1-{1-1-(λ_c/λ_0)~(P(1+γ))](N/N_f)}~(1/(1+γ)
