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Methodology to analyse aerospace structures repaired with a bonded composite patch

机译:分析用粘合复合材料补丁修复的航空航天结构的方法

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Adhesively bonded composite repair of metallic structures is one of the candidate technologies that has enormous potential in the ageing aircraft. A computational tool to analyse the repaired aerospace structure using an adhesively bonded composite patch is presented. This involves the three-layer technique based on the two-dimensional finite element method for adhesively bonded composite patch repair of cracked structures. This technique is capable of characterizing the crack growth and debond growth behaviour, as well as predicting the fatigue life extension of the repaired structure with a perfectly or imperfectly bonded patch. Also, the thermal effects which may develop during bonding or during service and the non-linear material behaviour of the adhesive are incorporated in this technique. The results from the three-layer technique show good agreement with experimental results as well as a previous investigator's published numerical results. Besides the accuracy of the technique, the advantage of the two- dimensional three-layer technique is cost-effectiveness when compared with the three-dimensional finite element or performing expensive experiments on various patch configurations for design purposes. An overview of the three-layer technique to investigate a cracked metallic plate repaired with bonded composite patch is presented in this paper.
机译:金属结构的粘接复合材料修复是在老化飞机中具有巨大潜力的候选技术之一。提出了一种计算工具,用于分析使用粘合复合材料补丁修复的航空航天结构。这涉及基于二维有限元方法的三层技术,用于对裂缝结构进行粘合的复合材料修补。该技术能够表征裂纹扩展和脱胶扩展行为,并预测具有完美或不完美粘合补丁的修复结构的疲劳寿命延长。同样,在粘合或使用过程中可能产生的热效应以及粘合剂的非线性材料性能也被并入了这项技术。三层技术的结果与实验结果以及先前研究者发表的数值结果显示出良好的一致性。除了该技术的准确性外,二维三层技术的优点是与三维有限元比较或出于设计目的对各种贴片配置进行昂贵的实验时具有成本效益。本文介绍了三层技术的概述,该技术用于研究用粘结的复合补片修复的破裂金属板。

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