Modeling of a cracked and repaired Al 2024T3 aircraft plate: effect of the composite patch shape on the repair performance

Abstract

In this work the finite element method was used to analyse the composite patch shape effect of the repair performance. Unlike all the works done conducted so far in this domain, this work proposed here, takes into account the reducing both, the stress intensity factor in repairing crack heads and the maximum shear stresses in the adhesive layer. This is the originality of this work. In function of the surface and the volume of the rectangular patch, three cases were taken into consideration: with conservation of the patches surface and its volume, with a reduction of the patches surface and its volumes, and in the end, with a reduction of the patches surface and conservation of its volume. The obtained results show that in the first case, the patch shape have no effect on the SIF, the sharp edges (obtuse, right and acute) of oblique shapes generate high shear stresses, in the second case, the reduced surfaces lead to significant mass gain with the same SIF values. and to an increase in the maximum shear stresses, in the latter case the patches shapes lead to a reduction of the SIF and the shear stresses.

XFEM and CZM modeling to predict the repair damage by composite patch of aircraft structures: Debonding parameters

“…damaged plate to the patch. To meet these conditions, the mechanical and geometrical properties of the adhesive must be optimized [7].…”

“…Composite bonded repair can therefore offer significantly improved mechanical performance of aircraft structures in terms of stiffness, static strength and fatigue resistance [1][2][3][4][5]. The effectiveness of the repair depends, among other things, on the mechanical and geometrical properties of the adhesive joint [6][7][8][9]. Due to its low stiffness, the adhesive is therefore the weakest component of the plate/adhesive/composite patch systems.…”

New investigation of delamination using the VCCT method to predict the damage in bonded composite repair plates subjected to tensile load

“…During the past 2 decades, the adoption of bonded composite repairs for metallic structures has increasingly gained significance as a valuable strategy to prolong the operational life span of aircraft. These repair techniques prove to be an effective method for reinstating the structure's maximum load-carrying capacity (Baghdadi et al, 2019;Berrahou et al, 2017;Ibrahim et al, 2018;Salem et al, 2023;Lesiuk et al, 2020;Rabczuk and Belytschko, 2004).…”

Improving the performance of damage repair in thin-walled structures with analytical data and machine learning algorithms

“…This technology provides several advantages over traditional methods such as mechanical fastening or riveting, including improved fatigue behavior, restored stiffness and strength, reduced corrosion, and the ability to be readily formed into complex shapes. The use of composite patches for repairing cracked plates has been extensively investigated, with researchers exploring different shapes and variations to improve repair performance [8,9]. Composite patches have been utilized by varying parameters, as demonstrated in studies conducted by Aabid et al [10].…”