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A simple method to calculate the crack growth life of adhesively repaired aluminum panels

机译：一种简单的方法来计算粘合修复的铝板的裂纹扩展寿命

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摘要

In this paper, a simple method is developed to predict the crack growth life of single-side repaired aluminum panels. The patches are considered to be made of glass/epoxy, boron/epoxy and graphite/epoxy composite materials. For this purpose, crack growth life of the repaired panels are calculated using two different approaches: (1) The crack growths along the panel thickness uniformly. In this simplified approach, crack-front line remains perpendicular to the plate surfaces during the crack propagation. (2) The crack growths along the panel thickness non-uniformly. In this approach, initial crack-front line changes to a curved shape according to the variation of stress intensity factor during the crack propagation (real crack-front shape). Then, a new simple method is developed based on a parametric study using both approaches. Using this simple method, it is not necessary to perform the complex crack growth analysis based on the real crack-front shape. Therefore, the results of 3D analysis using the first approach or 2D analysis similar to the three layers technique 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：本文提出了一种简单的方法来预测单面修复铝面板的裂纹扩展寿命。该贴剂被认为由玻璃/环氧树脂，硼/环氧树脂和石墨/环氧树脂复合材料制成。为此，使用两种不同的方法来计算修复后的面板的裂纹扩展寿命：（1）沿着面板厚度的裂纹扩展是均匀的。在这种简化方法中，在裂纹扩展过程中，裂纹前线保持垂直于板表面。 （2）裂纹沿着面板厚度不均匀地扩展。在这种方法中，初始裂纹前线根据裂纹扩展过程中应力强度因子的变化而变为弯曲形状（实际裂纹前形状）。然后，基于使用这两种方法的参数研究，开发了一种新的简单方法。使用这种简单的方法，就不必基于真实的裂纹前部形状执行复杂的裂纹扩展分析。因此，使用第一种方法进行3D分析的结果或类似于三层技术的2D分析的结果可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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