Deghboudj Samir

Université de Tébessa · Faculté des sciences et de la technologie

The purpose of this research is to optimize several variables, including fiber length, volumetric fiber percentage, and sodium hydroxide (NaOH) solution concentration, which influence the bending and compression behavior of cementitious composites reinforced with plant-based fibers from Agave americana. Samples of composites based on fibers extract...

The virulence and resistance of pathogenic microorganisms are promoted by quorum-sensing (QS) mediated traits and biofilms. The development of antimicrobial agents which can reduce the incidence of microbial resistance by disrupting the establishment of biofilms and QS, constitute a suitable strategy to reduce the emergence of pathogenic strains th...

In many engineering fields such as aerospace, marine, automotive and mechanical, the design of planar structures consisting of rectangular plates commonly requires the use of holes as a technological solution in fastening assemblies. The major goal of this research is to examine the impact of stress concentration factors (SCF) in the specific case...

A novel Butanolic extract of Ephedra major (denoted EBEM) was investigated as corrosion inhibitor 22 for mild steel in 1 M hydrochloric acid solution. The investigation was carried out using weight loss, 23 electrochemical impedance spectroscopy (EIS), Tafel polarization measurements, Fourier transform infrared 24 spectroscopy (FT-IR), and scanning...

A novel Butanolic extract of Ephedra major (denoted EBEM) was investigated as corrosion inhibitor for mild steel in 1 M hydrochloric acid solution. The investigation was carried out using weight loss, electrochemical impedance spectroscopy (EIS), Tafel polarization measurements, Fourier transform infrared spectroscopy (FT-IR), and scanning electron...

The purpose of this paper is to provide a detailed description of a hypoelastic constitutive model. An accurate and robust numerical algorithm is developed and implemented in the Abaqus/Explicit finite element code by means of a vectorized user material (VUMAT) subroutine written in FORTRAN. To validate this model, several elementary tests with dif...

L'effet de l'extrait butanolique de la plante «Origanum Glandulosum" sur la corrosion de l'acier XC35 dans la solution HCl1M a été étudié par la méthode de perte en poids, en utilisant les plans d'expériences. Différents paramètres ont été étudiés, à savoir la concentration d'inhibiteur, la température et le temps d'immersion. La méthode de surface...

The purpose of this study is to investigate the bending behavior of bio-composites resulting from the combination of three types of vegetable fibers (sisal, date palm, diss) with three polymeric matrices (epoxy, polyester, polyamide). This study made it possible to characterize these bio-sources composites by determining their micromechanical prope...

Alkali treatment was known as a commonly used treatment for natural fibres and resulted in good adhesion of the fibre matrix, as well as thermal and mechanical properties of the composite. This paper reports the effect of alkali treatment on the physical properties of banana type fibres such as density, diameter and fibre morphology. Alkali treatme...

Un composite est l’assemblage de plusieurs matériaux non miscibles de nature différente et dont les qualités se complètent afin d’obtenir un matériau hétérogène dont les performances sont supérieures à celles de ses composants. Un matériau composite est constitué d'un renfort (ossature du matériau) qui assure la tenue mécanique et d'une matrice (en...

Ce recueil de travaux pratiques s’adresse aux étudiants de la spécialité génie mécanique et ceux des cursus proches tels que l’aéronautique, le génie civil et l’hydraulique qui poursuivent des études de Master. Chaque travail pratique est accompagné de renseignements théoriques et pratiques. Des problèmes simples de mécanique, sont proposés, afin d...

The purpose of this study is to evaluate in detail the usability of new cellulosic fibers extracted from the stem of the plant Strelitzia reginae, as a potential reinforcement for polymer composites. The morphological, physical, thermal, and mechanical properties of fibers were addressed for the first time in this paper. Both untreated and alkali-t...

In this paper, synthesized organic compound of the family of ketene dithioacetal was studied as corrosion inhibitors for mild steel in 1.0 M hydrochloric acid by gravimetric measurement. The aim of this work is to study the effect of inhibitor concentration and the temperature on the resistance, corrosion and to compare the experimental results wit...

This paper presents studies made on fundamental flexural frequencies of isotropic alloy aluminum rectangular thin plate with various boundary conditions. The first four vibration modes and corresponding frequencies and mode shapes of this plate were obtained by using analytical method, based on Rayleigh-Ritz energy approach and finite element metho...

Compound materials reinforced with vegetable fibers have aroused great interest in recent years. This interest is mainly due to their economic and environmental advantages which come from their natural composition which allows them to contribute to the promotion of the policy of sustainable development. The main objective of this work is to study t...

The present paper deals with analytical and finite element studies carried out on free flexural vibration of symmetric cross-ply composite thin rectangular plate. Natural frequencies and mode shapes were determined using analytical method based on Rayleigh–Ritz energy approach. To demonstrate the accuracy of this method, the same plate was analyzed...

The present work aims to carry out modal analysis of orthotropic thin rectangular plate to determine its natural frequencies and mode shapes by using analytical method based on Rayleigh-Ritz energy approach. To demonstrate the accuracy of this approach, the same plate is discritisated and analyzed using the finite element method. The natural and an...

Compound materials reinforced with vegetable fibers have aroused great interest in recent years. This interest is mainly due to their economic and environmental advantages which come from their natural composition which allows them to contribute to the promotion of the policy of sustainable development. The main objective of this work is to study t...

This work is focused on the study of the free vibratory behavior of thin rectangular single-layer composite and laminated plates with different geometric configurations and different materials (glass/epoxy, carbon/epoxy and kevlar/epoxy).The study of the flexural vibration of this plate is mainly based on the search for natural frequencies and eige...

This work is focused on the study of the free vibratory behavior of a thin isotropic rectangular plate simply supported. The study of the bending vibration of this plate is mainly based on the search for natural frequencies and eigenmodes. Dynamic equilibrium is governed by a system of partial differential equations obtained either by a direct form...

La méthode des éléments finis (MEF) est une méthode numérique utilisée pour résoudre certains des problèmes de la physique. C'est une méthode qui permet de déterminer une solution approchée sur un domaine spatial, c'est-à-dire qui permet de calculer un champ (de scalaires, de vecteurs, de tenseurs) qui correspond à certaines équations et à certaine...

This work is focused on the study of the mechanical, thermal and thermo mechanical behavior of homogeneous thin plates. We are particularly interested to finite isotropic square plates, subjected separately and simultaneously to mechanical stresses (uniaxial tensile) and thermal loads (thermal expansion) in order to analyze analytically and numeric...

Shear deformation of composite reinforcement is the most significant and important mechanism of material characterization. So, in-plane shear properties of composite reinforcement are important parameters for determining application and use of this category of materials. The bias extension test is frequently employed to investigate the in-plane she...

Determining stress concentration factors is of practical importance for many engineering structures because geometric discontinuities are frequently the site of failure. In this paper, the work is carried out to analyze the stress concentration factor, around circular central hole in isotropic and orthotropic rectangular plates, subjected to ten...

La concentration de contraintes est un problème rencontré lors de la conception et du design d’une structure mécanique. Ce phénomène conduit à une amplification locale des contraintes dans une zone comportant une modification géométrique ou une singularité. Cette zone est souvent le site d’amorçage des fissures et peut être l’origine d’une rupture...

Cette étude concerne principalement le phénomène de concentration de contraintes dans une plaque rectangulaire finie, isotrope/orthotrope soumise à un champ de traction uniforme, en présence d’un trou circulaire central. Nous avons étudié l’évolution du facteur de concentration de contraintes autour de la singularité, analytiquement par les formula...

This study concerns the stress concentration phenomenon in a isotropic / orthotropic finite rectangular plate subjected to a uniform tension field, in the presence of circular holes.We studied the evolution of the stress concentration factor around the holes by using analytical formulations (Heywood Howland) and numerically by using ABAQUS software...

La corrosion étant un processus essentiellement électrochimique, l’action inhibitrice ne peut se faire qu’au niveau d’une des étapes des réactions élémentaires (transport d’espèces en solution, adsorption des espèces à la surface des phases solides et transfert de charge électronique) .Ils contiennent une partie non polaire, hydrophobe et relativem...

The knowledge of the mechanical behavior of woven fabrics is necessary in many applications, in particular, for the simulation of textile composite forming. However, in-plane shear behavior of textile performs is the most studied mechanical property, because this mode of deformation is necessary for forming on double curvature surfaces. In this pap...

The knowledge of the mechanical behavior of woven fabrics is necessary in many applications, in particular, for the simulation of textile composite forming. However, in-plane shear behavior of textile performs is the most studied mechanical property, because this mode of deformation is necessary for forming on double curvature surfaces. In this pap...

: L’étude du comportement mécanique des renforts tissés est d’une grande importance du fait qu’il nous permet d’alimenter de modèles adéquats toute simulation numérique des procédés de mise en forme de ceux si. Cependant le comportement en cisaillement est une condition indispensable pour toute étude de mise en forme des renforts tissés cette étude...