https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2692 Mon, 27 Jul 2026 09:48:06 GMT 2026-07-27T09:48:06Z https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2876 Titre: Dynamic calculation of a tapered shaft rotor made of composite material Auteur(s): Achache, Habib Résumé: This work proposes a theoretical and numerical study on the behavior of a tapered shaft rotor made of composite materials by the classical version h and the version p of the finite element method. Hierarchical form functions are used to define the model. The purpose of this paper is to determine the expressions of the kinetic and potential energies of the tree necessary for the results of the equations of motion. A comparison between the version h and the p version of the finite element method of the functions of polynomial and trigonometric hierarchical forms with six degrees of freedom per node, of a composite tapered and cylindrical shaft which rotates at a constant speed about its axis. It is found that when the number of functions of form (the version p) is increased, the solution converges. It is also observed that the conicity of the shaft increases the rigidity with respect to a uniform shaft having the same mechanical properties. The numerical simulation allowed us to determine the natural frequencies and the critical speeds of the composite shaft systems are compared with those available in the literature and the effectiveness of the methods used are discussed. Mon, 01 Jan 2018 00:00:00 GMT https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2876 2018-01-01T00:00:00Z https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2875 Titre: Delamination of a Composite Laminated under Monotonic Loading Auteur(s): Achache, Habib Résumé: Our work aims to analyze using the finite element method the evolution of the stress intensity factor (SIF) parameter K of three laminated folded plates stacks [+ α, -α], made of the same epoxy matrix and different reinforcement fibe rs (boron, graphite and glass). Our results show that the angle of orientation of the boron / epoxy composite has no great influence on the variation of the parameter K KI. Compared to composite graphite / epoxy and glass / epoxy, the laminated composite bor on / epoxy reduces more the SIF K KI in the middle of the plate for angles 0 ° ≤α≤30 °. Sun, 01 Jan 2017 00:00:00 GMT https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2875 2017-01-01T00:00:00Z