Abdellah Menou - Academia.edu (original) (raw)
Papers by Abdellah Menou
Revue Europeenne De Genie Civil, 2007
La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèle... more La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèles actuels permettent de prendre en compte des phénomènes de plus en plus complexes. Malgré cela, et particulièrement lorsqu'on doit se préoccuper de phénomènes couplés, les différentes échelles présentes dans la structure du matériau sont mal représentées par ce type d'approche. La modélisation de la structure matérielle à l'échelle du grain de sable (mésoscopique) couplée aux méthodes de calculs non linéaires permet de rendre compte de phénomènes complexes. Les modèles mésoscopiques considèrent le béton comme un matériau multiphasique (généralement biphasique). Le comportement de la pâte est différencié de celui des inclusions (granulats) dont la géométrie est souvent idéalisée par des sphères ou des disques. Nous nous intéressons dans cette étude au rôle de la finesse de la représentation géométrique des inclusions sur les résultats fournis par le modèle.
Http Dx Doi Org 10 1080 17747120 2007 9692936, Oct 5, 2011
La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèle... more La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèles actuels permettent de prendre en compte des phénomènes de plus en plus complexes. Malgré cela, et particulièrement lorsqu'on doit se préoccuper de phénomènes couplés, les différentes échelles présentes dans la structure du matériau sont mal représentées par ce type d'approche. La modélisation de la structure matérielle à l'échelle du grain de sable (mésoscopique) couplée aux méthodes de calculs non linéaires permet de rendre compte de phénomènes complexes. Les modèles mésoscopiques considèrent le béton comme un matériau multiphasique (généralement biphasique). Le comportement de la pâte est différencié de celui des inclusions (granulats) dont la géométrie est souvent idéalisée par des sphères ou des disques. Nous nous intéressons dans cette étude au rôle de la finesse de la représentation géométrique des inclusions sur les résultats fournis par le modèle.
The macroscopic modeling of the mechanical behavior of concrete has much evolved, and the current... more The macroscopic modeling of the mechanical behavior of concrete has much evolved, and the current models enable us to take into account increasingly complex phenomena. In spite of that, and particularly when coupled phenomena are concerned, the various scales present in the structure of material are badly represented by this kind of approach. The modeling of the material structure at the scale of the sand grain (mesoscopic) coupled with nonlinear computation methods makes it possible to take into account complex phenomena. The mesoscopic models for the concrete often idealize the geometry of inclusions by spheres or discs. This study is focused on the role of the acuracy of the geometrical representation of inclusions or aggregates on the results provided by the model.
Stage-like nature of the fatigue crack propagation in the bimetallic specimen into macro-, meso-,... more Stage-like nature of the fatigue crack propagation in the bimetallic specimen into macro-, meso-, and micro-levels is determined.It is found that 10 s hold under the maximum loading (trapezoidal cycle) increases the fatigue crack growth rate by 3–8 times.The step of striations is 60% lower than the macrorate.
Key Engineering Materials, 2013
La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèle... more La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèles actuels permettent de prendre en compte des phénomènes de plus en plus complexes. Malgré cela, et particulièrement lorsqu'on doit se préoccuper de phénomènes couplés, les différentes échelles présentes dans la structure du matériau sont mal représentées par ce type d'approche. La modélisation de la structure matérielle à l'échelle du grain de sable (mésoscopique) couplée aux méthodes de calculs non linéaires permet de rendre compte de phénomènes complexes. Les modèles mésoscopiques considèrent le béton comme un matériau multiphasique (généralement biphasique). Le comportement de la pâte est différencié de celui des inclusions (granulats) dont la géométrie est souvent idéalisée par des sphères ou des disques. Nous nous intéressons dans cette étude au rôle de la finesse de la représentation géométrique des inclusions sur les résultats fournis par le modèle.
European Journal of Operational Research, 2010
The geographical location of Morocco places it at the heart of important sea, air, rail and motor... more The geographical location of Morocco places it at the heart of important sea, air, rail and motorway transport routes between four continents. In this study we evaluate different alternatives to centralize multimodal cargo at a Moroccan airport hub. The choice depends on different socio-economical criteria, the geographical location, and the environmental impacts. Some of the criteria can be measured quantitatively,
Http Dx Doi Org 10 1080 17747120 2005 9692806, Oct 5, 2011
This paper deals with the study of concrete structures exposed to fire. The aim of this study is ... more This paper deals with the study of concrete structures exposed to fire. The aim of this study is to investigate and to model the damage mechanisms of concrete after exposure to high temperature. Numerical simulations have been carried out in order to study the structural effect of confined concrete specimens when they are subjected to high temperature. Theses simulations show
Revue Europeenne De Genie Civil, 2005
MJ CONDENSED …, 2010
The durability of mortar structures is affected by chemical and mechanical factors, such as abras... more The durability of mortar structures is affected by chemical and mechanical factors, such as abrasion, temperature variation..., the Degradation of mortar structures located under flowing water in their structure or high humidity atmospheres. In this study we presented a method for ultrasonic non-destructive characterization in mortar to follow the evolution of the signals back scattered by mortar structures for different size of sand, Samples were manufactured using same water/cement ration (w/c) 0.65, and cement/sand ration (c/s) 0.5. The processing of the ultrasound wave has been chosen to follow the hardening of mortar and to understand the mechanisms driving to the degradation of mortar in relation with microstructure.
Procedia Technology, 2015
Fatigue damage of metal structures may be estimated by the application of sensors with the surfac... more Fatigue damage of metal structures may be estimated by the application of sensors with the surface relief pattern indicating the accumulated fatigue damage. The nature of the deformation relief has been investigated. Digital analysis of the surface patterns based algorithm for the integral evaluation method has proved the efficiency of integral parameters (the general area of damage, mean gradient along the coordinate axes, and the mean amplitude of the histogram function spectrum) application for additional quantitative description of such surface structures. The evolution of deformation relief parameters on the sensors surface is determined by the process of the sensor and construction fatigue damage accumulation.
International Journal of Engineering Education
This paper presents a new pedagogical experiment based on skills in computer design courses. The ... more This paper presents a new pedagogical experiment based on skills in computer design courses. The evaluation of competencies is principally carried out during design projects that involve new products issued according to client need. The 11 students are introduced to CAD software through a theoretical course that gives them the requisite background and appropriate tools. The evaluation is essentially conducted during the design process, which includes the use of the CAD software package and integrates project management procedures to increase the engineering students’ performance. Considering the project’s complexity and the short time period the achieved results are very promising and demonstrate high deliverable quality. These results promise an excellent potential to be reused to enhance the teaching level during future years.
This paper presents the study of hardness profile of spur gear heated by induction heating proces... more This paper presents the study of hardness profile of spur gear heated by induction heating process in function of the machine parameters, such as the power (kW), the heating time (s) and the generator frequency (kHz). The global work is realized by 3D finite-element simulation applied to the process by coupling and resolving the electromagnetic field and the heat transfer problems, and it was performed in three distinguished steps. First, a Comsol 3D model was built using an adequate formulation and taking into account the material properties and the machine parameters. Second, the convergence study was conducted to optimize the mesh. Then, the surface temperatures and the case depths were deeply analyzed in function of the initial current density and the heating time in medium frequency (MF) and high frequency (HF) heating modes and the edge effect were studied. Finally, the simulations results are validated using experimental tests.
International Journal for Simulation and Multidisciplinary Design Optimization, 2008
The main source of Electromagnetic Interference (EMI) emissions in power converters used for Tele... more The main source of Electromagnetic Interference (EMI) emissions in power converters used for Telecom application comes from the high switching frequency of DC voltages. Power converters are generally operating in a periodic steady state, interested converter waveforms are typically periodic functions of time. Indeed the EMI emissions are a critical factor, which, can harm the system and degrade the satisfaction of Electromagnetic Compatibility (EMC). However, the most of design engineers use randomly various basic EMI reduction techniques. It is meaningful to quantify and analyze them before taking any solution measures. In fact, the diagnostic research of power converters is still under exploring. This article presents simplified equivalent circuit model used to predict the influence of common mode (CM) current noise in switching mode power supply. At the base of analysis, proposed equivalent circuit model contains essential couplings, parasitic elements, and sources occurred in the common mode current path. This circuit composed of input cables; equivalent voltage source and the intentional parameters of the converter is examined theoretically. A comparative analysis between practical results and the proposed model highlight good matching. At last, effective EMI suppressing techniques has been realized on an AC/DC converter prototype in order to validate the proposed model.
Journal of Materials Engineering and Performance, 2014
The beneficial effects of using flux concentrators during induction heat treatment process of spu... more The beneficial effects of using flux concentrators during induction heat treatment process of spur gears made of 4340 high strength steel is demonstrated using 3D finite element model. The model is developed by coupling electromagnetic field and heat transfer equations and simulated by using Comsol software. Based on an adequate formulation and taking into account material properties and process parameters, the model allows calculating temperature distribution in the gear tooth. A new approach is proposed to reduce the electromagnetic edge effect in the gear teeth which allows achieving optimum hardness profile after induction heat treatment. In the proposed method, the principal gear is positioned in sandwich between two other gears having the same geometry that act as flux concentrators. The gap between the gear and the flux concentrators was optimized by studying temperature variation between the tip and root regions of gear teeth. Using the proposed model, it was possible identifying processing conditions that allow for quasiuniform final temperature profile in the medium and high frequency conditions during induction hardening of spur gears.
Procedia Technology, 2015
Revue Française de Génie Civil, 2003
Within the framework of the study of concrete structures subjected to fire, a theoretical and exp... more Within the framework of the study of concrete structures subjected to fire, a theoretical and experimental work has been achieved. The aim of this study is to investigate and to model the damage mechanisms of concrete after exposure to high temperature. The multiphase Numeral Concrete Model and the damage model, MODEV, implemented on finite element software SYMPHONIE, were used simultaneously
Revue Europeenne De Genie Civil, 2007
La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèle... more La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèles actuels permettent de prendre en compte des phénomènes de plus en plus complexes. Malgré cela, et particulièrement lorsqu'on doit se préoccuper de phénomènes couplés, les différentes échelles présentes dans la structure du matériau sont mal représentées par ce type d'approche. La modélisation de la structure matérielle à l'échelle du grain de sable (mésoscopique) couplée aux méthodes de calculs non linéaires permet de rendre compte de phénomènes complexes. Les modèles mésoscopiques considèrent le béton comme un matériau multiphasique (généralement biphasique). Le comportement de la pâte est différencié de celui des inclusions (granulats) dont la géométrie est souvent idéalisée par des sphères ou des disques. Nous nous intéressons dans cette étude au rôle de la finesse de la représentation géométrique des inclusions sur les résultats fournis par le modèle.
Http Dx Doi Org 10 1080 17747120 2007 9692936, Oct 5, 2011
La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèle... more La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèles actuels permettent de prendre en compte des phénomènes de plus en plus complexes. Malgré cela, et particulièrement lorsqu'on doit se préoccuper de phénomènes couplés, les différentes échelles présentes dans la structure du matériau sont mal représentées par ce type d'approche. La modélisation de la structure matérielle à l'échelle du grain de sable (mésoscopique) couplée aux méthodes de calculs non linéaires permet de rendre compte de phénomènes complexes. Les modèles mésoscopiques considèrent le béton comme un matériau multiphasique (généralement biphasique). Le comportement de la pâte est différencié de celui des inclusions (granulats) dont la géométrie est souvent idéalisée par des sphères ou des disques. Nous nous intéressons dans cette étude au rôle de la finesse de la représentation géométrique des inclusions sur les résultats fournis par le modèle.
The macroscopic modeling of the mechanical behavior of concrete has much evolved, and the current... more The macroscopic modeling of the mechanical behavior of concrete has much evolved, and the current models enable us to take into account increasingly complex phenomena. In spite of that, and particularly when coupled phenomena are concerned, the various scales present in the structure of material are badly represented by this kind of approach. The modeling of the material structure at the scale of the sand grain (mesoscopic) coupled with nonlinear computation methods makes it possible to take into account complex phenomena. The mesoscopic models for the concrete often idealize the geometry of inclusions by spheres or discs. This study is focused on the role of the acuracy of the geometrical representation of inclusions or aggregates on the results provided by the model.
Stage-like nature of the fatigue crack propagation in the bimetallic specimen into macro-, meso-,... more Stage-like nature of the fatigue crack propagation in the bimetallic specimen into macro-, meso-, and micro-levels is determined.It is found that 10 s hold under the maximum loading (trapezoidal cycle) increases the fatigue crack growth rate by 3–8 times.The step of striations is 60% lower than the macrorate.
Key Engineering Materials, 2013
La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèle... more La modélisation macroscopique du comportement mécanique du béton a beaucoup évoluée et les modèles actuels permettent de prendre en compte des phénomènes de plus en plus complexes. Malgré cela, et particulièrement lorsqu'on doit se préoccuper de phénomènes couplés, les différentes échelles présentes dans la structure du matériau sont mal représentées par ce type d'approche. La modélisation de la structure matérielle à l'échelle du grain de sable (mésoscopique) couplée aux méthodes de calculs non linéaires permet de rendre compte de phénomènes complexes. Les modèles mésoscopiques considèrent le béton comme un matériau multiphasique (généralement biphasique). Le comportement de la pâte est différencié de celui des inclusions (granulats) dont la géométrie est souvent idéalisée par des sphères ou des disques. Nous nous intéressons dans cette étude au rôle de la finesse de la représentation géométrique des inclusions sur les résultats fournis par le modèle.
European Journal of Operational Research, 2010
The geographical location of Morocco places it at the heart of important sea, air, rail and motor... more The geographical location of Morocco places it at the heart of important sea, air, rail and motorway transport routes between four continents. In this study we evaluate different alternatives to centralize multimodal cargo at a Moroccan airport hub. The choice depends on different socio-economical criteria, the geographical location, and the environmental impacts. Some of the criteria can be measured quantitatively,
Http Dx Doi Org 10 1080 17747120 2005 9692806, Oct 5, 2011
This paper deals with the study of concrete structures exposed to fire. The aim of this study is ... more This paper deals with the study of concrete structures exposed to fire. The aim of this study is to investigate and to model the damage mechanisms of concrete after exposure to high temperature. Numerical simulations have been carried out in order to study the structural effect of confined concrete specimens when they are subjected to high temperature. Theses simulations show
Revue Europeenne De Genie Civil, 2005
MJ CONDENSED …, 2010
The durability of mortar structures is affected by chemical and mechanical factors, such as abras... more The durability of mortar structures is affected by chemical and mechanical factors, such as abrasion, temperature variation..., the Degradation of mortar structures located under flowing water in their structure or high humidity atmospheres. In this study we presented a method for ultrasonic non-destructive characterization in mortar to follow the evolution of the signals back scattered by mortar structures for different size of sand, Samples were manufactured using same water/cement ration (w/c) 0.65, and cement/sand ration (c/s) 0.5. The processing of the ultrasound wave has been chosen to follow the hardening of mortar and to understand the mechanisms driving to the degradation of mortar in relation with microstructure.
Procedia Technology, 2015
Fatigue damage of metal structures may be estimated by the application of sensors with the surfac... more Fatigue damage of metal structures may be estimated by the application of sensors with the surface relief pattern indicating the accumulated fatigue damage. The nature of the deformation relief has been investigated. Digital analysis of the surface patterns based algorithm for the integral evaluation method has proved the efficiency of integral parameters (the general area of damage, mean gradient along the coordinate axes, and the mean amplitude of the histogram function spectrum) application for additional quantitative description of such surface structures. The evolution of deformation relief parameters on the sensors surface is determined by the process of the sensor and construction fatigue damage accumulation.
International Journal of Engineering Education
This paper presents a new pedagogical experiment based on skills in computer design courses. The ... more This paper presents a new pedagogical experiment based on skills in computer design courses. The evaluation of competencies is principally carried out during design projects that involve new products issued according to client need. The 11 students are introduced to CAD software through a theoretical course that gives them the requisite background and appropriate tools. The evaluation is essentially conducted during the design process, which includes the use of the CAD software package and integrates project management procedures to increase the engineering students’ performance. Considering the project’s complexity and the short time period the achieved results are very promising and demonstrate high deliverable quality. These results promise an excellent potential to be reused to enhance the teaching level during future years.
This paper presents the study of hardness profile of spur gear heated by induction heating proces... more This paper presents the study of hardness profile of spur gear heated by induction heating process in function of the machine parameters, such as the power (kW), the heating time (s) and the generator frequency (kHz). The global work is realized by 3D finite-element simulation applied to the process by coupling and resolving the electromagnetic field and the heat transfer problems, and it was performed in three distinguished steps. First, a Comsol 3D model was built using an adequate formulation and taking into account the material properties and the machine parameters. Second, the convergence study was conducted to optimize the mesh. Then, the surface temperatures and the case depths were deeply analyzed in function of the initial current density and the heating time in medium frequency (MF) and high frequency (HF) heating modes and the edge effect were studied. Finally, the simulations results are validated using experimental tests.
International Journal for Simulation and Multidisciplinary Design Optimization, 2008
The main source of Electromagnetic Interference (EMI) emissions in power converters used for Tele... more The main source of Electromagnetic Interference (EMI) emissions in power converters used for Telecom application comes from the high switching frequency of DC voltages. Power converters are generally operating in a periodic steady state, interested converter waveforms are typically periodic functions of time. Indeed the EMI emissions are a critical factor, which, can harm the system and degrade the satisfaction of Electromagnetic Compatibility (EMC). However, the most of design engineers use randomly various basic EMI reduction techniques. It is meaningful to quantify and analyze them before taking any solution measures. In fact, the diagnostic research of power converters is still under exploring. This article presents simplified equivalent circuit model used to predict the influence of common mode (CM) current noise in switching mode power supply. At the base of analysis, proposed equivalent circuit model contains essential couplings, parasitic elements, and sources occurred in the common mode current path. This circuit composed of input cables; equivalent voltage source and the intentional parameters of the converter is examined theoretically. A comparative analysis between practical results and the proposed model highlight good matching. At last, effective EMI suppressing techniques has been realized on an AC/DC converter prototype in order to validate the proposed model.
Journal of Materials Engineering and Performance, 2014
The beneficial effects of using flux concentrators during induction heat treatment process of spu... more The beneficial effects of using flux concentrators during induction heat treatment process of spur gears made of 4340 high strength steel is demonstrated using 3D finite element model. The model is developed by coupling electromagnetic field and heat transfer equations and simulated by using Comsol software. Based on an adequate formulation and taking into account material properties and process parameters, the model allows calculating temperature distribution in the gear tooth. A new approach is proposed to reduce the electromagnetic edge effect in the gear teeth which allows achieving optimum hardness profile after induction heat treatment. In the proposed method, the principal gear is positioned in sandwich between two other gears having the same geometry that act as flux concentrators. The gap between the gear and the flux concentrators was optimized by studying temperature variation between the tip and root regions of gear teeth. Using the proposed model, it was possible identifying processing conditions that allow for quasiuniform final temperature profile in the medium and high frequency conditions during induction hardening of spur gears.
Procedia Technology, 2015
Revue Française de Génie Civil, 2003
Within the framework of the study of concrete structures subjected to fire, a theoretical and exp... more Within the framework of the study of concrete structures subjected to fire, a theoretical and experimental work has been achieved. The aim of this study is to investigate and to model the damage mechanisms of concrete after exposure to high temperature. The multiphase Numeral Concrete Model and the damage model, MODEV, implemented on finite element software SYMPHONIE, were used simultaneously