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首页> 外文期刊>Composite Structures >Comparison of the effectiveness of boron/epoxy and graphite/epoxy patches for repaired cracks emanating from a semicircular notch edge
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Comparison of the effectiveness of boron/epoxy and graphite/epoxy patches for repaired cracks emanating from a semicircular notch edge

机译：硼/环氧树脂和石墨/环氧树脂补丁对从半圆形缺口边缘产生的修复裂缝的有效性比较

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摘要

The adhesively bonded composite patch repair technique has been used to restore or extend the service life of the cracked aluminium structural components because of its efficiency. In this study, the finite element method is used to analyse the performance of the different bonded composite patches at a semicircular lateral notch and the repair of cracks emanating from this kind of notch. The knowledge of the stress distribution in the neighbourhood of the cracks is important for the analysis of their repair according to the geometry of the patch. The effects of the mechanical and geometrical properties on the variation of the stress intensity factor in the crack tip were highlighted. The effects of the adhesive properties and of the patch size on the stress intensity factor variation at the crack tip in mode I were also highlighted. The comparison between the double and single patch repairs is also given in this study. The results obtained show that the stress intensity factor of the crack tip repaired by two composite patches, is reduced to a half compared to the one that is repaired only by one patch. The orientation of fibres possessing a higher rigidity perpendicularly to the crack propagation considerably influences the reduction of the stress intensity factor. The adhesive properties must be optimised in order to increase the performance of the patch repair or the reinforcement.
机译：由于其效率，粘合复合修补程序修复技术已被用于恢复或延长破裂的铝结构部件的使用寿命。在这项研究中，使用有限元方法分析了不同粘结复合材料贴片在半圆形横向切口处的性能以及这种切口产生的裂缝的修复。裂纹附近应力分布的知识对于根据补丁的几何形状分析其修复非常重要。突出了力学和几何特性对裂纹尖端应力强度因子变化的影响。还强调了在模式I下，粘合特性和贴剂尺寸对裂纹尖端应力强度因子变化的影响。这项研究还给出了两次和一次补丁修复之间的比较。获得的结果表明，与仅由一个贴片修复的裂纹尖端相比，由两个复合贴片修复的裂纹尖端的应力强度因子降低了一半。垂直于裂纹扩展具有较高刚度的纤维的取向极大地影响了应力强度因子的降低。必须优化粘合性能，以提高补片修补或增强的性能。

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