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Structural Engineering and Mechanics Volume 83, Number 5, September10 2022 , pages 693-707 DOI: https://doi.org/10.12989/sem.2022.83.5.693 |
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Numerical analysis of the combined aging and fillet effect of the adhesive on the mechanical behavior of a single lap joint of type Aluminum/Aluminum |
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S.M. Medjdoub, K. Madani, L. Rezgani, S. Mallarino, S. Touzain and R.D.S.G. Campilho
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| Abstract | ||
| Bonded joints have proven their performance against conventional joining processes such as welding, riveting and bolting. The single-lap joint is the most widely used to characterize adhesive joints in tensile-shear loadings. However, the high stress concentrations in the adhesive joint due to the non-linearity of the applied loads generate a bending moment in the joint, resulting in high stresses at the adhesive edges. Geometric optimization of the bonded joint to reduce this high stress concentration prompted various researchers to perform geometric modifications of the adhesive and adherends at their free edges. Modifying both edges of the adhesive (spew) and the adherends (bevel) has proven to be an effective solution to reduce stresses at both edges and improve stress transfer at the inner part of the adhesive layer. The majority of research aimed at improving the geometry of the plate and adhesive edges has not considered the effect of temperature and water absorption in evaluating the strength of the joint. The objective of this work is to analyze, by the finite element method, the stress distribution in an adhesive joint between two 2024-T3 aluminum plates. The effects of the adhesive fillet and adherend bevel on the bonded joint stresses were taken into account. On the other hand, degradation of the mechanical properties of the adhesive following its exposure to moisture and temperature was found. The results clearly showed that the modification of the edges of the adhesive and of the bonding agent have an important role in the durability of the bond. Although the modification of the adhesive and bonding edges significantly improves the joint strength, the simultaneous exposure of the joint to temperature and moisture generates high stress concentrations in the adhesive joint that, in most cases, can easily reach the failure point of the material even at low applied stresses. | ||
| Key Words | ||
| adherend bevel; fillet of adhesive; humidity; single-lap joint; temperature | ||
| Address | ||
| S.M. Medjdoub: Department of Mechanical Engineering, University of Sidi Bel Abbes, BP 89 Cité Ben M'hidi 22000, Sidi Bel Abbes, Algeria K. Madani: Djillali Liabes University of Sidi Bel Abbes, Sidi Bel Abbes 22000, Algeria L. Rezgani: Department of Civil Engineering, Taher Moulay University of Saida, Algeria S. Mallarino: LaSIE, Laboratoire des Sciences de l'Ingénieur pour l'Environnement, La Rochelle University, France S. Touzain: LaSIE, Laboratoire des Sciences de lIngénieur pour l'Environnement, La Rochelle University, France R.D.S.G. Campilho: ISEP-School of Engineering, Polytechnic of Porto, R. Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal; INEGI-Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal | ||