Off-axis fatigue cracking behaviour in notched fibre metal laminates
Off-axis fatigue cracking behaviour in notched fibre metal laminates
复制标题
缺口纤维金属层压板的离轴疲劳裂纹行为
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
H. Hahn
中科院分区：
文献类型：
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作者：
P. Chang;Jenn‐Ming Yang;Hyoungseock Seo;H. Hahn
通过实验和数值研究了等幅加载条件下缺口纤维金属层合板的离轴疲劳开裂行为。研究发现，随着离轴角的增加，离轴疲劳裂纹萌生寿命降低。这表明离轴层压板提高了铝 (Al) 层中施加的应力水平，并随后导致铝层中较早出现裂纹。使用层压理论和文献中基于能量的临界平面疲劳损伤分析来预测有缺口的纤维金属层压板的离轴疲劳裂纹萌生寿命。
在 Al 层中出现裂纹后，观察到离轴样品的裂纹路径角既不垂直于纤维也不垂直于加载方向。建立了有限元模型来预测裂纹路径角度。
The off-axis fatigue cracking behaviour of notched fibre metal laminates under constant amplitude loading conditions was investigated experimentally and numerically. It was found that the off-axis fatigue crack initiation life decreased as the off-axis angles increased. This indicated that the off-axis laminates raised the applied stress level in the aluminium (Al) layer and subsequently resulted in earlier cracking in the Al layer. The off-axis fatigue crack initiation lives of notched fibre metal laminates were predicted using lamination theory and an energy-based critical plane fatigue damage analysis from the literature.
After a crack initiated in the Al layer, it was observed that the crack path angles of the off-axis specimens were neither perpendicular to the fibre nor to the loading direction. A finite-element model was established for predicting the crack path angles.