Analysis and design of adhesively bonded joints for fatigue and fracture loading: a fracture-mechanics approach |
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| Authors: | S Azari A Ameli M Papini |
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| Affiliation: | 1. Department of Mechanical and Industrial Engineering , University of Toronto , 5 King’s College Road, Toronto , Ontario , M5S 3G8 , Canada;2. Department of Mechanical and Industrial Engineering , Ryerson University , 350 Victoria Street, Toronto , Ontario , M5B 2K3 , Canada |
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| Abstract: | An experimental–computational fracture-mechanics approach for the analysis and design of structural adhesive joints under static loading is demonstrated by predicting the ultimate fracture load of cracked lap shear and single lap shear aluminum and steel joints bonded using a highly toughened epoxy adhesive. The predictions are then compared with measured values. The effects of spew fillet, adhesive thickness, and surface roughness on the quasi-static strength of the joints are also discussed. This fracture-mechanics approach is extended to characterize the fatigue threshold and crack growth behavior of a toughened epoxy adhesive system for design purposes. The effects of the mode ratio of loading, adhesive thickness, substrate modulus, spew fillet, and surface roughness on the fatigue threshold and crack growth rates are considered. A finite element model is developed to both explain the experimental results and to predict how a change in an adhesive system affects the fatigue performance of the bonded joint. |
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| Keywords: | toughened adhesive fracture mechanics fatigue adhesive thickness adherend modulus surface roughness |
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