J-integral evaluation of repaired cracks in AA7075-T6 structures subjected to uniaxial tensile stresses

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Authors

Zouambi, Leila
Khodja, Malika
Oudad, Wahid
Fekirini, Hamida
Moller, Heinrich
Bouiadjra, Belabbes Bachir

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Elsevier

Abstract

Bonded repairs using composite patches over metallic structures have been evaluated as a cost effective method to increase the life of damaged structures. The J-integral is a widely applied fracture mechanics parameter relating to the energy release associated with crack growth and is a measure of the deformation intensity at the crack tip. In practice, the calculated J-integral can be compared with a critical value for the material under consideration to predict fracture. This study aimed at providing an overview of the behavior of a cracked plate of AA7075-T6 alloy repaired with a boron-epoxy patch bonded with FM73 Adhesive layer. The Finite Element Method (FEM) using Abaqus Software 6.14 predicted the performance. The results show a considerable decrease in the value of the J-integral. This is due to the beneficial effect of the patch on the stress state at the crack tip. The best results were obtained from a uni-directional composite fibres orientation of 0°, where the fibers oriented parallel to the direction of load. A parametric analysis has been carried out to evaluate the effect of lay-up, load variation and crack mouth opening on the J-integral. It was found that the crack mouth opening displacement (CMOD) was reduced by 90–97%.

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Keywords

AA7075-T6, J-integral, Cracks, Adhesive bonding, Boron/epoxy, Crack mouth opening displacement (CMOD), Finite element method (FEM)

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Citation

Zouambi, L., Khodja, M., Oudad, W. et al. 2019, 'J-integral evaluation of repaired cracks in AA7075-T6 structures subjected to uniaxial tensile stresses', Polymer Testing, vol. 77, art. 105874, pp. 1-11.