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Delamination of a composite laminated under monotonic loading
Achache, Habib,Benzerdjeb, Abdelouahab,Mehidi, Abdelkader,Boutabout, Benali,Ouinas, Djamel Techno-Press 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.5
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 [$+{\alpha}$, $-{\alpha}$], made of the same epoxy matrix and different reinforcement fibers (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 KI. Compared to composite graphite/epoxy and glass/epoxy, the laminated composite boron/epoxy reduces more the SIF KI in the middle of the plate for angles $0^{\circ}{\leq}{\alpha}{\leq}30^{\circ}$.
Delamination of a composite laminated under monotonic loading
Habib Achache,Abdelouahab Benzerdjeb,Abdelkader Mehidi,Benali Boutabout,Djamel Ouinas 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.5
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 [+a,-a], made of the same epoxy matrix and different reinforcement fibers (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 KI. Compared to composite graphite/epoxy and glass/epoxy, the laminated composite boron/epoxy reduces more the SIF KI in the middle of the plate for angles 0 <= a <= 30.
Evaluation of energy release rate of composites laminated with finite element method
Habib Achache,Benali Boutabout,Abdelouahab Benzerdjeb,Djamel Ouinas 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.55 No.1
Control of the mechanical behavior of composite materials and structures under monotonic and dynamic loads for cracks and damage is a vast and complex area of research. The modeling of the different physical phenomena and behavior characteristics of a composite material during deformation play an important role in the structural design. Our study aims to analyze numerically the energy release rate parameter G of a composite laminated plate (glass or boron / epoxy) cross-ply [+α, −α] in the presence of a crack between two circular notches under the effect of several parameters such as fiber orientation α, the crack orientation β, the orientation γ of the two considered circular notches and the effect of mechanical properties. Our results show clearly that both notches orientation has more effect on G than the cracks and fibers orientations.
Dynamic calculation of a tapered shaft rotor made of composite material
Rachid, Zahi,Kaddour, Refassi,Achache, Habib Techno-Press 2018 Advances in aircraft and spacecraft science Vol.5 No.1
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.
Effects of temperature on the evolution of stresses at the stem cement interface
Kaci, Djafar Ait,Moulgada, Abdelmadjid,Achache, Habib,Bounoua, Noureddine Techno-Press 2019 Advances in computational design Vol.4 No.3
The insertion of femoral implants is the most important phase for surgeons, given the characteristics of the cement during its mixing phase, generating residual stresses of thermal origin that increase the different stresses induced in the bone cement. The aim of our study is to determine the different stresses that affect the cement and more particularly at the cement-implant interface for different temperatures, and to make a comparison with the cement at ambient temperature. It was concluded that, there are a large concentration of stresses in the proximal part of the cement. For normal stresses, the bone cement is affected by stresses of tension and compression due to the effect of polymerization and the contraction of the cement.