The effects of geometry and material properties on the fracture of single lap-shear joints |
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| Institution: | 1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;2. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA;1. LBMS, ENSTA Bretagne, Brest, France;2. LCTS, CNRS UMR 5801, Université Bordeaux, Pessac, France;3. IJLRA, CNRS UMR 7190, Université P. et M. Curie, Paris, France;1. Missouri University of Science and Technology, 1401 North Pine Street, Rolla, MO 65409, USA;2. University of Patras, Rio Achaia, Patras, Greece;3. University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy;4. University of Padova, Via Marzolo 9, 35131 Padova, Italy;1. Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. Grupo de Elasticidad y Resistencia de Materiales, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain |
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| Abstract: | A review of the mechanics of lap-shear joints is followed by a detailed analysis of the problem using a cohesive-zone approach. The cohesive-zone model allows not only the influence of geometry to be considered, but also allows the cohesive properties of the interface and plastic deformation of the adherends to be included in the analysis. The first part of the paper examines the strength of elastic joints, with an emphasis on the effects of geometry, the cohesive strength of the adhesive, and mode-mixedness. The cohesive-zone models show a transition to the predictions of linear-elastic fracture mechanics under conditions where these are expected to apply. The second part of the paper examines the effect of plasticity in the adherends, and looks at the transition between the elastic and plastic regimes. The final part of the paper makes comparisons between the predictions of the numerical calculations and experimental observations for a model system consisting of a commercial adhesive used to bond an aluminum alloy. Using cohesive-zone parameters previously determined for this particular combination of materials, the numerical predictions show excellent agreement with the experimental observations. |
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