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首页> 外文期刊>Composite Structures >Initiation and progression of composite patch debonding in adhesively repaired cracked metallic sheets
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Initiation and progression of composite patch debonding in adhesively repaired cracked metallic sheets

机译：粘合修复的裂纹金属板中复合贴剂剥离的引发和进展

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Failure analysis of composite bonded repairs in cracked metallic structures is often given superficial treatment. Apart from crack growth, which is prevented during the design of the repair by ensuring that the stress intensity factor will remain in safe levels, patch debonding is a very critical failure mode since its presence reduces the effective area of the patch. In this paper, a finite element-based progressive failure model was used to investigate the geometrical effects on patch debonding initiation and progression induced by mechanical loading. A metallic sheet containing a central through-thickness crack loaded in tension and repaired using a double-sided rectangular tapered composite patch was used as the basic configuration. In all cases examined, the debonding is due to cohesion or adhesion failure caused by high shear stresses. It was found that, depending to the patch thickness, the debonding initiates either at the upper patch edge (being catastrophic for the repair) or at the crack faces (being not catastrophic). Given the adhesive shear strength, the debonding initiation load increases significantly with increasing the patch thickness, adhesive thickness and tapered length. Based on these findings, specific suggestions for the enhancement of composite bonded repairs against debonding are made.
机译：通常对破裂的金属结构中的复合粘结修补物的失效分析进行表面处理。除了在裂纹修复过程中通过确保应力强度因子保持在安全水平来防止裂纹扩展之外，补丁剥离也是非常关键的破坏模式，因为它的存在会减少补丁的有效面积。在本文中，基于有限元的渐进破坏模型用于研究几何效应对由机械载荷引起的斑片脱粘起始和进展的影响。基本的构造是使用金属板，该金属板的中心拉伸厚度裂纹处于拉伸状态，并使用双面矩形锥形复合补片进行修复。在所有检查的情况下，剥离都是由于高剪切应力导致的内聚力或粘合力下降。已经发现，取决于补丁的厚度，脱粘起始于补丁的上边缘（对于修复是灾难性的）或在裂纹面（不是灾难性的）处开始的。在给定粘合剂剪切强度的情况下，随着贴剂厚度，粘合剂厚度和锥形长度的增加，脱粘起始载荷显着增加。基于这些发现，针对增强复合粘结修复剂的抗粘连性提出了具体建议。

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