Topology optimisation of patch in Quasi-isotropic graphite-epoxy composite repair (in-plane direction) under tensile loading using Finite element analysis


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Abstract


This study provides the general guidance to make use of FEA (Finite Element Analysis) tool so as to optimize the patches on bonded repair (in plane direction) composite structures. The objective of repair process is to restore the original strength of the damaged structure with minimal usage of repair material in turn reducing the much geometrical property variation from the original structure. If more repair materials are used with the damaged structure considering the structural integrity, which could affect functional requirements and aerodynamic performance of the structure. Hence, an attempt has been made to design the optimised patch, through and through using FEA tool. The concept of topology optimisation has been extended to arrive the optimised patch in Quasi-isotropic graphite/epoxy composite. For this work, plate with hole problem has been considered to demonstrate the optimisation process. In order to quantify the material saving through this optimisation technique, conventional repair technique (circular patching) problem also solved using FEA and the results are compared. Through this technique, free shape optimum patch could be arrived (in plane direction ) effectively for any kind of damages (i.e. war field damages, regular cut-outs and damages due to improper handling of acerbic tools) over any kind of composite surfaces like flat, curved and wavy, as the problem is completely handled through FEA tool.
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Keywords


Optimisation; Composite Repair; Patch; FEA and Graphite Epoxy

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