Jamal Mohammad

Jamal Mohammad
Université Hassan II de Casablanca · Physics

PhD HDR Professor of Mechanics

About

124
Publications
16,625
Reads
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397
Citations
Citations since 2017
48 Research Items
237 Citations
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Introduction
Jamal Mohammad currently works at the Laboratoire d'Ingénierie et Matériaux LIMAT, Université Hassan II de Casablanca. Jamal does research in Computational Physics and Mechanics. Their current project is 'meshless methods'.
Additional affiliations
January 2013 - present
Université Hassan II de Casablanca
Position
  • Professor (Full)
Description
  • My research focuses on : 1) Instability, buckling, post-buckling and nonlinear vibration of structures and nanostructures . 2) Nanomaterials and Nanocomposites. 3) Asymptotic Numerical Methods (ANM).
January 2012 - present
June 1984 - June 1987
Université Sidi Mohamed Ben Abdellah, Faculté des Sciences, Meknes, Maroc
Position
  • Chercheur au laboratoire de la Physique Théorique et Hautes énergies
Description
  • Production des quarks charmés dans les collisions photon-proton à hautes énergies.

Publications

Publications (124)
Article
Abstrac Abstract: This work aims to propose an implicit algorithm for solving the magnetoelastic wave propagation in a magnetostrictive actuator. This algorithm is built by combining meshless methods with the Newmark implicit time scheme. The mathematical formulation of vibrations of the actuator is performed by modeling the experimental actuator d...
Article
In this paper, we propose a numerical algorithm, combining the reproducing kernel particle collocation (RKPC) meshless method with the implicit Newmark time integration scheme to examine the transient response of porous composite beams (PCB) strengthened with functionally graded (FG) graphene oxide powders (GOP), and resting on elastic foundations...
Article
Full-text available
The paper presents a numerical analysis of the behavior of single-layered graphene sheet (SLGS) using a mesh-free approach based on a nonlocal continuum plate model (NCPM). The adopted NCPM constructed by incorporating the nonlocal elasticity theory into the first order shear deformation elastic plate theory is able to capture small length scale ef...
Article
In this paper, the linear bending response of straight, thin to moderately thick functionally graded (FG) composite beams reinforced with graphene oxide powder (GOP) and subjected to two types of static mechanical loads, with various boundary conditions is investigated using a meshfree collocation method based on multiquadric radial basis functions...
Article
In this paper, the nonlinear bending analysis of Functionally Graded Porous (FGP) beams is investigated using an efficient numerical algorithm associating a meshless collocation technique uses the Multiquadric Radial Basis Function (MQRBF) approximation method and a higher-order Taylor series-based continuation procedure. Material properties of the...
Article
In this paper, a numerical algorithm combining the meshless collocation technique based on the globally supported Multiquadric Radial Basis Function (MQRBF) approximation method and the Asymptotic Numerical Method (ANM) is developed to investigate the nonlinear and linear static behaviors of Single-Walled Carbone Nanotubes (SWCNTs) based on a Nonlo...
Presentation
Full-text available
REVIEWER CERTIFICATE NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS WILEY 27 February 2020
Thesis
Due to their remarkable physical and chemical properties, carbon nanostructures, including graphene sheets, carbon nanotubes, and fullerenes are commonly used as components in various dispositifs. Consequently, the determination of their physical and chemical characteristics and the exact prediction of their mechanical behaviors such as buckling an...
Article
Full-text available
In this work, we have investigated numerically the disappearance of wrinkles from a tended membrane by the Asymptotic Numerical Method (ANM) using the finite-element DKT18. The ANM is a path-following technique that has been used to solve bifurcation problems. We show numerically the influence of the terms corresponding to the membrane displacement...
Article
Full-text available
Abstract. This paper aims to investigate, in large displacement and torsion context, the nonlinear dynamic behavior of thin-walled beams with open cross section subjected to various loadings by high-order implicit solvers. These homotopy transformations consist to modify the nonlinear discretized dynamic problem by introducing an arbitrary invertib...
Article
This paper aims to investigate, in large displacement and torsion context, the nonlinear dynamic behavior of thin-walled beams with open cross section subjected to various loadings by high-order implicit solvers. These homotopy transformations consist to modify the nonlinear discretized dynamic problem by introducing an arbitrary invertible pre-con...
Article
In this work, we have investigated numerically the disappearance of wrinkles from a tended membrane by the Asymptotic Numerical Method (ANM) using the finite-element DKT18. The ANM is a path-following technique that has been used to solve bifurcation problems. We show numerically the influence of the terms corresponding to the membrane displacement...
Conference Paper
Full-text available
The aim of this work consists to model and simulate the vibrations of magnetostrictive actuators. The mechanical modeling of the actuator is performed using a one-dimensional magnetostrictive rod attached to an elastic spring. The formulation of problem is carried out using the Euler-Bernoulli theory of elastic beams taking into account the couplin...
Conference Paper
Full-text available
Les matériaux magnétostrictifs sont des matériaux intelligents qui ont une large gamme d'applications pour l'actionnement et la détection [1,2]. Ils ont été largement utilisés dans l'industrie du développement de divers dispositifs, tels que des actionneurs, des capteurs, des transducteurs, des haut-parleurs, des amortisseurs de vibrations, des rel...
Conference Paper
The aim of this work consists to model and simulate the vibrations of magnetostrictive actuators. The mechanical modeling of the actuator is performed using a one-dimensional magnetostrictive rod attached to an elastic spring. The formulation of problem is carried out using the Euler-Bernoulli theory of elastic beams taking into account the couplin...
Conference Paper
In this work, we study the forced nonlinear vibrations with large amplitude and large torsion of composite thin walled beams with open variable cross sections under external dynamic loads using a high order implicit algorithm. The used algorithm is based on the temporal and spatial discretizations, the homtopoy transformation, Taylor series expansi...
Conference Paper
Full-text available
Ce travail concerne la modélisation par éléments finis de la vibration non linéaire des poutres en rotation. L’analyse proposée est faite en utilisant un algorithme implicite d’ordre élevé avec pré-conditionneur. Cette modélisation prend en compte les grandes rotations. Les équations du mouvement sont établies sans aucune approximation sur l’amplit...
Conference Paper
Ce travail a pour objectif l’étude numérique de l’influence du rapport d’aspect et de l’épaisseur d’une feuille mince soumise à une traction sur la disparition du plissement. Deux modèles de la déformation sont utilisés : le modèle de von Kàrmàn et un modèle de von Kàrmàn Amélioré. Les équations non linéaires obtenues sont résolues par la Méthode A...
Conference Paper
The present work investigates the Large Deformation Behavior (LDB) of a Single Layered Graphene sheet (SLGS) subjected to external transverse loading. The analysis is carried out employing a High Order Mesh-free Method (HOMM) which is built within the framework of the Nonlocal First Order Shear Deformation Plate Theory (NFOSDPT) employing the Asymp...
Article
In this paper, a high order mesh-free method is investigated for buckling and post-buckling analysis of shells subjected to external loadings. This high order mesh-free method is built within the framework of the First Order Shear Deformation Theory (FOSDT) employing the Asymptotic Numerical Method (ANM) and the mesh-free collocation method. The st...
Article
Full-text available
In this work, we study the forced nonlinear vibrations with large amplitude and large torsion of composite thinwalled beams with open variable cross sections under external dynamic loads using a high order implicit algorithm. The used algorithm is based on the temporal and spatial discretizations, the homtopoy transformation, Taylor series expansio...
Article
This work concerns numerical simulations of the frictional contact of two elastic deformable bodies and a novel treatment technique of incompatible contact nodes. These numerical simulations are based on a high order mesh-free method coupling the Moving Least Square (MLS) with the Asymptotic Numerical Method (ANM) and on a regularization technique....
Conference Paper
Full-text available
Piezoelectric nanostructures of the beam type find wide applications in the field of nanoelectromechanical systems (NEMS) because of their superior mechanical properties and their electromechanical coupling. The nanostructured piezoelectric materials exhibit size-dependent properties, which are different from their macroscopic counterparts. To pred...
Conference Paper
Full-text available
In recent years, nanostructures have aroused great interest for many applications such as energy recovery systems or very high precision sensors. Nanostructures are characterized by nonzero surface energies inducing effective properties dependent on surface effects or size effects. Nanostructures such as nanowires, nanobars, nanobeams, nanoplates o...
Conference Paper
Full-text available
Piezoelectric nanostructures of the beam type find wide applications in the field of nanoelectromechanical systems (NEMS) because of their superior mechanical properties and their electromechanical coupling. The nanostructured piezoelectric materials exhibit size-dependent properties, which are different from their macroscopic counterparts. To pred...
Conference Paper
The main objective of this work is to develop an approach for studying the buckling of piezoelectric nanobeams under axial compression. The developed approach is obtained by combining the classical piezoelectric Euler-Bernoulli beams and the surface elasticity Gurtin-Murdoch models. The buckling loads of the axially compressed piezoelectric nanobea...
Conference Paper
A meshfree method based on the (MLSA) approximation is developed for investigating the free vibration of a single-layered graphene sheets (SLGSs). In this approach, the nonlocal first order shear deformation plate theory (NLFOSDT) is used. The domain occupied by the SLGSs is represented by a set of distributed nodes and no element is required. The...
Poster
L’objectif de ce travail est d’appliquer la méthodes sans maillage MLS aux problèmes bidimensionnels. La méthode repose sur la combinaison de la méthode des moindres carrés mobiles et la technique de collocation. L’approche proposée est testée sur les exemples de plaque en traction et en flexion soumise a un chargement.
Conference Paper
L’objectif de ce travail vise l'analyse du comportement flexionnel d’une nanoplaque élastique moyennant une approche qui combine un modèle continu non local de la théorie des plaques de Mindlin et la méthode sans maillage MLS. L’approche proposée prend en compte l’effet des petites échelles de longueurs. Les équations d’équilibre et les conditions...
Article
A numerical mesh-free model applied to a strong formulation for simulating elasto-plastic structures with contact is developed in the context of large deformation. This numerical mesh-free model is based on the Asymptotic Numerical Method (ANM) which is used in the meshless collocation framework to extend its application field to elasto-plastic pro...
Article
A numerical mesh-free model applied to a strong formulation for simulating elasto-plastic structures with contact is developed in the context of large deformation. This numerical mesh-free model is based on the Asymptotic Numerical Method (ANM) which is used in the meshless collocation framework to extend its application field to elasto-plastic prob...
Article
Full-text available
A numerical mesh-free model applied to a strong formulation for simulating elasto-plastic structures with contact is developed in the context of large deformation. This numerical mesh-free model is based on the Asymptotic Numerical Method (ANM) which is used in the meshless collocation framework to extend its application field to elasto-plastic prob...
Conference Paper
Full-text available
Ce travail vise la simulation de la réponse dynamique non linéaire des poutres à parois minces et à sections constante ouvertes sous chargements dynamiques quelconques. La formulation théorique du problème est basée sur un modèle tridimensionnel complet de poutres tenant compte des grands déplacements, des grandes torsions et du couplage flexion-to...
Conference Paper
Full-text available
The present work investigates the nanoscale vibration behavior of double-layered graphene sheets (DLGSs) resting on elastic medium taking into account effects of van der Waals (vdW) interactions. The analysis is carried out employing meshless method (MLSA) based on the nonlocal elastic plate theory. The DLGSs is modeled by a double thin elastic nan...
Article
Full-text available
In this paper, we propose a new explicit analytical formula of the critical buckling load of double-walled carbon nanotubes (DWCNT) under axial compression. This formula takes into account van der Waals interactions between adjacent tubes and the effect of terms involving tube radii differences generally neglected in the derived expressions of the...
Article
In this paper, we present an original work for the examination of the stability of thin-walled beams with open section subject to arbitrary loads. It is based on a 3D nonlinear model where the equilibrium and material constitutive equations are established without any assumption on the torsion angle amplitude which leads to strong nonlinearity. In...
Conference Paper
Le flambage des nanotubes de carbone à double parois soumis à des forces de compression axiales est analysé moyennant l'approche de la mécanique moléculaire des structures. Les nanotubes de carbone sont modélisés par des treillis de poutres en considérant les liaisons entre les atomes de carbone comme des éléments de poutres 3D à deux nœuds et à se...
Conference Paper
Full-text available
En se basant sur un algorithme implicite d'ordre élevé appliqué à un modèle tridimensionnel complet de poutre, on se propose, dans ce travail, d'analyser de la dynamique des poutres à parois minces et à sections ouvertes soumises à des excitations extérieures. L'algorithme utilisé prend en compte les grandes torsions et le couplage flexion torsion....
Conference Paper
Full-text available
Dans ce travail, nous proposons un modèle élément fini 3D pour l'analyse numérique de la vibration libre et forcée des poutres à paroi mince et à section ouverte. L'analyse proposée est basée sur un algorithme implicite d'ordre élevé avec pré-conditionneur. Cette modélisation prend en compte les grandes torsions et le couplage flexion-torsion. Les...
Conference Paper
Full-text available
This paper aims to examine the contribution of the extended finite element method (XFEM) in finite strain fracture mechanics problems. A generalized neo-Hookean hyperelastic material is considered in an incompressible plane stress approximation. The accuracy of the implementation is demonstrated by a series of numerical tests.
Conference Paper
Full-text available
Based on a 3D non-linear model of large torsion of thin-walled open cross section beams under arbitrary external eccentric loads and the Asymptotic Numerical method (ANM), we investigate the buckling and post-buckling behaviors of these structures. The equilibrium and material constitutive equations are established without any assumption on the tor...
Conference Paper
Une formule analytique explicite de la charge critique de flambage des nanotubes de carbone à double-parois (DWCNT) sous compression axiale avec prise en compte des interactions de Van der Waals entre parois est proposée. L’approche continue des coques cylindriques élastiques multiples de type Donnell a été adoptée dans ce travail pour modéliser le...
Conference Paper
Full-text available
" L’étude des structures à parois minces sous chargements quelconques est rarement abordée dans la littérature. L’objectif de ce travail est de présenter un modèle théorique et numérique pour le calcul du flambage de poutres formées de profils ouverts à parois minces sous chargements quelconques, et de faire une analyse statique en grands déplaceme...
Article
Full-text available
In this paper, we propose a high order continuation based on time power series expansion and time rational representation called Padé approximants for solving nonlinear structural dynamic problems. The solution of the discretized nonlinear structural dynamic problems, by finite elements method, is sought in the form of a power series expansion with...
Conference Paper
Full-text available
The objective of this research is to present a variant of an Asymptotic Numerical Method (ANM) family for investigating the buckling and post-buckling behaviour of thin-walled open sections beams under external loadings. This is achieved by associating the finite elements method and power series expansion technique with respect to a path parameter....
Conference Paper
Full-text available
L’objectif de ce travail est de présenter une approche de résolution des problèmes de la dynamique non linéaires des structures. Dans cette approche on utilise la technique des développements en série par rapport au temps. La solution du problème non linéaire, discrétisé par éléments finis, régissant la dynamique de la structure, est cherchée sous...
Data
Full-text available
In this paper, we propose a high order continuation based on time power series expansion and time rational representation called Padé approximants for solving nonlinear structural dynamic problems. The solution of the discretized nonlinear structural dynamic problems, by finite elements method, is sought in the form of a power series expansion with...
Conference Paper
Full-text available
Ce travail concerne la modélisation numérique de la vibration des poutres à parois minces et à sections ouvertes en grande torsion à l’aide d’un élément fini à deux nœuds et à sept degrés de liberté par nœud. L’étude non linéaire, sous charge dynamique, est abordée à l’aide d’un algorithme implicite d’ordre élevé avec pré-conditionneur [3]. Des exe...
Article
On développe dans ce travail quelques solveurs temporels implicites d'ordre élevé pour la résolution des problèmes dynamiques non linéaires des structures élastiques en transformations finies. Ces solveurs se basent sur la méthode de perturbation, la transformation homotopique et sur des techniques de discrétisation temporelle et spatiale. On montr...
Article
En se basant sur les techniques utilisées dans la Méthode Asymptotique Numérique (MAN), on propose quelques algorithmes pour la résolution des problèmes instationnaires non linéaires. L'association des techniques d'homotopie, de discrétisation en temps et de perturbation fournit des solveurs implicites génériques. Ces algorithmes utilisent la même...
Article
We develop in this work, some implicit temporal high order solvers for solving non linear elastic structural dynamic problems involving finite deformations. These solvers are based on the perturbation method, the homotopical transformation and time space discretization techniques. Their accuracy is improved by the introduction of Padé approximants....