Abstract
AbstractThree-dimensional finite element analyses have been carried out for adhesively bonded composite patch repaired an aluminum alloy plate structure with centre circular notch. Presence of defect in the plate causes stress gradients in the bond region which results in reduction of the performance of the patched panel. The patterns of out-of-plane stress components at various interfaces (plate-adhesive-patch) at different angular positions with reference to loading direction are evaluated for mono-modulus adhesive. In the present research work, an attempt has been made to improve the strength of adhesively bonded composite patch repaired system by reducing stress concentration at the critical regions. This has been achieved by smoothening/relieving stresses over the entire bond region by introducing functionally graded adhesive (FGA) material in-lieu of conventional mono-modulus adhesive. Linear material gradation function profile has been used to tailor adhesive layer in the bond region. Effect of material gradation profile with different modulus ratios on out-of-plane stresses at different interfaces of composite patch repaired system have been studied. Numerical simulations based on FE analyses indicates significant reduction in out-of-plane stress levels by which strength of functionally graded composite patch repaired system will be enhanced.
Publisher
Springer Science and Business Media LLC
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