On the evaluation of a critical distance approach for failure load prediction of adhesively bonded dissimilar materials
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O R I G I NA L A RT I C L E
C. E. Cruz-G · A. Akhavan-Safar · L. F. M da Silva · M. R. Ayatollahi
On the evaluation of a critical distance approach for failure load prediction of adhesively bonded dissimilar materials
Received: 22 May 2019 / Accepted: 12 February 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The validity of the critical longitudinal strain method (CLS) was proved for a wide range of adhesives and substrates employed in bonding similar substrates (same substrate thickness and material). However, the recent need of weight reduction yields a challenge of joining dissimilar materials, especially where composite laminates are bonded to metal substrates. Based on this industrial demand, the need of using a simple approach for failure load estimation of dissimilar adhesive joints is increasing. The aim of this work is to extend the CLS approach to be able to predict the failure load of adhesively bonded dissimilar single lap joints (SLJs). To achieve this, dissimilar SLJs with a brittle adhesive were manufactured and tested. On the other hand, experimental results of other researchers were also considered where composite substrates were bonded to metal adherends. Based on the results, it was found that by doing a minor modification, the already developed CLS method can be successfully applied to dissimilar SLJs. It is shown that the modified CLS method is able to predict the failure load of dissimilar SLJs with both brittle and ductile adhesives. Keywords Critical longitudinal strain · Dissimilar adhesive joints · Failure load prediction · CFRP · Single lap joint
1 Introduction The application of adhesively bonded joints has increased significantly in different industries due to their advantages such bonding dissimilar materials. For example, one of the recommendations of the European Corporate Average Fuel Economy regulation to reduce CO2 emission is weight reduction through the use Communicated by Andreas Öchsner. C. E. Cruz-G (B) Centro de Ingeniería y Desarrollo Industrial Sede Estado de México, Av. Desarrollo s/n, Parque Industrial Cuamatla, 54763 Cuautitlan Izcalli, Mexico E-mail: [email protected] A. Akhavan-Safar Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal L. F. M. da Silva Departamento de Engenharia Mecanica, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal M. R. Ayatollahi Fatigue and Fracture Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
Evaluation of a critical distance approach for failure load prediction
of dissimilar material joining such as high strength steel–aluminum or aluminum–carbon fiber composite laminates [1]. However, this implies several phenomena that should be considered before joining dissimilar materials, such as stress distribution along the bond line and in the adherends [2]. Dissimilar material bonding was first explored by Ha
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