Contribution à l’optimisation du comportement des plaques stratifiées contenant des singularités géométriques

Khechai, Abdelhak (2001) Contribution à l’optimisation du comportement des plaques stratifiées contenant des singularités géométriques. Doctoral thesis, UNIVERSITE MOHAMED KHIDER BISKRA.

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Abstract

The design of high performance composite structures frequently includes discontinuities to reduce the weight and fastener holes for joining. To understand the complex behavior of laminated panels with multiple cutouts, it is necessary to have access to accurate stress and failure prediction theories for perforated composite plates under various types of loading conditions. The main aim of the present work is to examine the existing methods to estimate the stress distribution and failure load in composite plates with single and multiple holes, and subsequently join or modify them to provide a simple and an accurate tool for a quick estimation of the stress and failure load. In order to minimize the stress concentration and maximize the failure load in laminates with multiple holes, the logic of Defense Hole Theory (DHT) is used. Defense hole theory deals with introducing auxiliary holes beside the main hole to reduce the stress developed around the main cutout. The failure theory was implemented in ABAQUS c using user material (UMAT) subroutine. The optimum configurations are obtained using Genetic Algorithm (GA) interfaced with a CAE solver. The obtained results are verified and validated with the available results and experimental data. This methodology is able to accurately determine the optimum cutout configurations to minimize the maximum von-Mises stress and maximize the minimum failure load.

Item Type: Thesis (Doctoral)
Uncontrolled Keywords: Stress concentration, Failure load, Finite Element Method, Genetic algorithm, In-plane loading, Composite material, Holes and cutouts, Digital image correlation
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculté des Sciences et de la technologie > Département de Génie Civil et Hydraulique
Depositing User: BFST
Date Deposited: 11 Apr 2019 09:53
Last Modified: 11 Apr 2019 09:53
URI: http://thesis.univ-biskra.dz/id/eprint/3986

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