Shear fracture toughness and cohesive laws of adhesively-bonded joints

J.C.S. Azevedo, R.D.S.G. Campilho, F.J.G. Silva
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引用次数: 1

Abstract

Adhesive bonding is a viable technique to reduce weight and complexity in structures. Additionally, this joining technique is also a common repair method for metal and composite structures. However, a generalized lack of confidence in the fatigue and long-term behaviour of bonded joints hinder their wider application. Suitable strength prediction techniques must be available for the application of adhesive bonding, and these can be based on mechanics of materials, conventional fracture mechanics or damage mechanics. These two last methodologies require the knowledge of the fracture toughness (GC) of materials. Being damage mechanics-based, Cohesive Zone Modelling (CZM) analyses coupled with Finite Elements (FE) are under investigation. In this work, CZM laws were estimated in shear for a brittle adhesive (Araldite® AV138) and high-strength aluminium adherends, considering the End-Notched Flexure (ENF) test geometry. The CZM laws were obtained by an inverse methodology based on curve fitting, which made possible the precise estimation of the adhesive joints’ behaviour. It was concluded that a unique set of shear fracture toughness (GIIC) and shear cohesive strength (ts0) exists for each specimen that accurately reproduces the adhesive layer behaviour. With this information, the accurate strength prediction of adhesive joints in shear is made possible by CZM.

粘接接头剪切断裂韧性及粘接规律
粘接是减轻结构重量和复杂性的可行技术。此外,这种连接技术也是金属和复合材料结构的常见修复方法。然而,对粘结接头的疲劳和长期性能普遍缺乏信心阻碍了它们的广泛应用。对于粘接的应用,必须有合适的强度预测技术,这些技术可以基于材料力学、传统断裂力学或损伤力学。最后两种方法需要材料断裂韧性(GC)的知识。基于损伤力学的内聚区模型(CZM)与有限元(FE)相结合的分析方法正在研究中。在这项工作中,考虑到端缺口弯曲(ENF)测试几何形状,在脆性粘合剂(Araldite®AV138)和高强度铝粘合剂的剪切中估计了CZM定律。采用基于曲线拟合的反求方法得到了CZM规律,从而可以对粘接接头的行为进行精确估计。得出的结论是,每个试样都存在一组独特的剪切断裂韧性(GIIC)和剪切内聚强度(ts0),可以准确地再现粘接层的行为。有了这些信息,利用CZM可以准确地预测剪切过程中粘接接头的强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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