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Effects of composite patches on fatigue crack propagation of single-side repaired aluminum panels

机译：复合贴剂对单面修复铝板疲劳裂纹扩展的影响

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摘要

The major concern of this review paper is the effect of crack-front shape on fatigue crack growth of the repaired aluminum panels with single-side composite patches in Mode-Ⅰ condition. It is experimentally and numerically shown that the crack growths non-uniformly from its initial position along the thickness of a single-side repaired panel and the crack-front shape are an important parameter influencing the stress intensity factor and crack propagation rate. Furthermore, effects of plate and patch thickness on the crack growth life of the repaired panels are investigated. It is shown that the lives obtained from uniform crack growth modeling using unpatched surface results are too conservative and the lives calculated using the mid-plane results are non-conservative by the order of 35-90%. It is also shown that the differences between the lives obtained from the non-uniform crack growth modeling and the experimental results are about 10%. A simple method is also introduced to predict the crack growth life of single-side repaired aluminum panels avoiding the complex crack growth analysis based on the non-uniform crack growth or real crack-front shape modeling. Therefore, the results of even a 2D analysis may be used to estimate the crack growth life of the repaired panels. The obtained results are verified with the available experimental results.
机译：本文的主要关注点是在Ⅰ型工况下，裂纹前部形状对单面复合材料修补铝板疲劳裂纹扩展的影响。实验和数值研究表明，裂纹从其初始位置沿单面修复板的厚度不均匀扩展，并且裂纹前部形状是影响应力强度因子和裂纹扩展速率的重要参数。此外，研究了板和贴剂厚度对修复后面板裂纹扩展寿命的影响。结果表明，使用未修补的表面结果通过均匀裂纹扩展建模获得的寿命过于保守，而使用中平面结果计算的寿命非保守，约为35-90％。还表明，从不均匀裂纹扩展模型获得的寿命与实验结果之间的差异约为10％。还引入了一种简单的方法来预测单面修复铝板的裂纹扩展寿命，从而避免了基于非均匀裂纹扩展或真实裂纹前部形状建模的复杂裂纹扩展分析。因此，甚至2D分析的结果也可以用于估计修复后面板的裂纹扩展寿命。获得的结果与可用的实验结果进行了验证。

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