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Residual fatigue life analysis and comparison of an aluminum lithium alloy structural repair for aviation applications

机译:航空应用铝锂合金结构修复的残余疲劳寿命分析与比较

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摘要

A method for residual-fatigue-life estimation of repaired aluminium-lithium alloy structures designed for use in aerospace applications is presented. Crack propagation was investigated using the Abaqus software package while the stress intensity factor was calculated using the FRANC3D package. Paris equation was applied to estimate the fatigue-crack growth rate. The residual fatigue life of and corresponding a-N curve for the repaired structure were obtained via post-processing under varying conditions of repair-structure shape, size, position, and stress levels. Results demonstrate that structural repairs possessing relative width, height, and thickness values of 35.7%, 50%, and 83.3%, respectively, tend to increase the residual fatigue life of the overall structure.
机译:提出了一种用于航空航天应用中的修复铝 - 锂合金结构的残留疲劳寿命估计方法。 使用ABAQUS软件包进行裂缝传播,而使用FRAND3D封装计算应力强度因子。 Paris方程被应用于估计疲劳裂纹的生长速率。 通过在修复结构形状,尺寸,位置和应力水平的不同条件下通过后处理获得修复结构的残余疲劳寿命和对应的A-N曲线。 结果表明,具有35.7%,50%和83.3%的相对宽度,高度和厚度值的结构修复趋于增加整体结构的残余疲劳寿命。

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