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材料工程  1979 

过载对LY12铝板疲劳裂纹扩展速率的影响

, PP. 21-27

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Abstract:

本文研究了LY12铝合金板材,在过载比为2.0时的几种典型加载条件下的疲劳裂纹扩展行为。重点考虑了压缩过载的影响,并对其中前、后各施加一次单个拉伸和前、后各施加一次先拉、后压的过载试验,用线性累积法和Wheeler模型算法作了估算和比较。估算的结果表明Wheeler算法对塑性区尺寸是敏感的,可以调整m值来拟合试验,其中包括压缩过载,能得到较好的结果。从工程估算角度,它可以通过试件、构件和全尺寸的各种谱载的疲劳试验,积累m值的分布规律,看来是当前较好的估算方法之一。

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