Evaluation of the critical SERR in the presence of heterogeneous interfaces in bonded joints: application to parallel defects in DCB titanium alloy laser-treated specimens

In this study, longitudinal defects are examined in the context of adhesively bonded structures, a subject that has remained understudied in previous investigations. Employing fracture mode I loading on double cantilever beam (DCB) specimens with variable adhesion strength, we investigate the influe...

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Bibliographic Details
Published inJournal of the Brazilian Society of Mechanical Sciences and Engineering Vol. 46; no. 4
Main Authors Taleb Ali, Mahfoudh, Jebri, Zaineb, Jumel, Julien
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2024
Springer Nature B.V
Subjects
Adhesive bonding
Adhesive strength
Bonded joints
Cantilever beams
Defects
Energy release rate
Engineering
Mathematical analysis
Mechanical Engineering
Mechanical tests
Technical Paper
Titanium alloys
Titanium base alloys
Adhesive stiffness
Moment-based approach
Longitudinal defects
Laser texturizing
DCB testing
Crack front shape
Mechanical resistance
Fracture energy
Crack propagation
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Summary:In this study, longitudinal defects are examined in the context of adhesively bonded structures, a subject that has remained understudied in previous investigations. Employing fracture mode I loading on double cantilever beam (DCB) specimens with variable adhesion strength, we investigate the influence of weakened adhesion areas on the critical stress energy release rate (SERR). Modifications of titanium alloy specimen surfaces, with nanosecond laser treatment, alter their surface morphology dynamically. Our mechanical testing unveils a pronounced effect of weakened adhesion areas on SERR, necessitating a nuanced understanding. A comprehensive model is presented that takes both transversal and longitudinal defects into account, providing detailed insight into the effect of finite defects on SERR values. The theoretical models meticulously calculate overall critical SERR ( G c ) in heterogeneous bond lines, exhibiting a compelling correlation with experimental results. The study underscores the nonlinear variation in critical SERR ( G c ) with the fraction of strong adhesion area, a phenomenon influenced by the crossover between areas of good and weakened adhesion.
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ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-024-04819-9