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Inicio Ciência & Tecnologia dos Materiais Shear fracture toughness and cohesive laws of adhesively-bonded joints
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Vol. 29. Issue 1.
Materiais 2015
Pages e124-e129 (January - April 2017)
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Vol. 29. Issue 1.
Materiais 2015
Pages e124-e129 (January - April 2017)
DOI: 10.1016/j.ctmat.2016.05.003
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Shear fracture toughness and cohesive laws of adhesively-bonded joints
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J.C.S. Azevedo, R.D.S.G. Campilho, F.J.G. Silva
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fgs@isep.ipp.pt

Corresponding author.
Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
Article information
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.

Keywords:
Crack growth
finite element analysis
fracture mechanics
structural integrity
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Copyright © 2017. Portuguese Society of Materials (SPM)
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