abdelkrim aid - Academia.edu (original) (raw)

Papers by abdelkrim aid

Research paper thumbnail of Temperature Parameter Effect on the Fracture Behaviour of the Polymer Material: Case of Hdpe

In this study, the finite element method is used to analyze the effect of a geometric discontinui... more In this study, the finite element method is used to analyze the effect of a geometric discontinuity on the fracture behaviour of polymer material (High-Density-Polyethylene; HDPE). The effect of the temperature parameter on the distribution of stresses and strains at the notch (geometric discontinuity) has been studied. The results obtained numerically show a good correlation with experimental results. The Rice-Tracey (RT) model is used to reproduce the macroscopic mechanical behavior of the HDPE material in terms of stress versus strain for different temperature level.

Research paper thumbnail of Biomechanical Evaluation of Bone Quality Effect on Stresses at Bone-Implant Interface: A Finite Element Study

Applied and Computational Mechanics, 2020

The aim of this study is to evaluate the effect of the alveolar bone quality on von Mises stress ... more The aim of this study is to evaluate the effect of the alveolar bone quality on von Mises stress at the bone-implant interface during occlusal loading. Four (3D) finite element models of fully osteointegrated 3-mm diameter × 11.5-mm length dental implant indifferent alveolar bone with different cortical bone thickness are created, using SolidWorks computer aided design software. The alveolar bone cortical-spongy bone ratio modelled includes I) 90%-10%, II) 60%-40%, III) 40%-60%, and IV) 10%-90%. These models are then exported to ABAQUS software and stress analyses are run under an occlusal load of 70 N acting on the platform face of the dental implant. Results of this study show that the implants are subjected to similar stress distributions in all models; maximum stress values are confined in the outer cervical plate of the cortical bone around the neck. This could explain bone loss and implant de-osseointegration. Peak stresses are lowest in the model with 90% cortical bone (14.2 ...

Research paper thumbnail of Quantification Of Damage And Fatigue Life Under Random Loading

The fatigue of components and structures under real stress is a very complex process that appears... more The fatigue of components and structures under real stress is a very complex process that appears at the grain scale. The present work is to highlight a variable loading fatigue life prediction process using the Rain-flow cycle count method and cumulative damage models. Four damage cumulative models are retained and used to estimate the lifetime and to evaluate the indicator of the damage (D) namely: the model Miner, the model of the damaged stress "DSM", the theory unified and finally Henry's law. The first step of the present study consists in the implementation of the organigram of all methods (Rainflow method coupled to the cumulative damage models) in a Matlab program and the second step is estimation of the lifetime and evaluation of the damage indication in the real-time to the studied structure. Résumé La fatigue des composants et des structures sous sollicitations réelles, est un processus très complexe qui apparaît à l'échelle des grains. Le présent trava...

Research paper thumbnail of Finite Element Modeling And Analytical Solution Of A Semi-Elliptic Crack'S Jintegral

In this work, we first evaluate the J-integral rupture parameter as a function of various crack p... more In this work, we first evaluate the J-integral rupture parameter as a function of various crack parameters (crack size, rod dimensions, intensity and nature of loads) for various crack form. In a second step, and in the base of the results obtained by the finite element method, we propose formulas of the factor shape, whose implementation remains rather simple and inexpensive in terms of time, effort and means to the engineer in order to predict evolution of the rupture behavior of a cylindrical component with a semielliptical crack emerging from the surface. The comparison of the proposed analytical solution showed a good performance relatively with results of the literature.<br>

Research paper thumbnail of Numerical Analysis and Optimization of the Residual Stresses Distribution Induced by Cold Expansion Technique

Frattura ed Integrità Strutturale, 2018

This paper presents a numerical investigation about the influence of mandrel shape on residual st... more This paper presents a numerical investigation about the influence of mandrel shape on residual stresses induced by the cold expansion procedure. Thus, ball and tapered pin are used for cold expanding the plate. As, the entrance face presents the lowest residual stresses throughout the hole thickness, we propose to solve this problem by varying the mandrel taper degree, instead of applying a double expansion. The obtained results show that the tapered pin is more suitable for the cold expansion. More, low taper increases the residual stresses at the entrance, reaching the values generated at the exit face.

Research paper thumbnail of Prediction the life of the composite material to a fatigue test

The goal of this work is to assessing the life of the composite material. This research is subdiv... more The goal of this work is to assessing the life of the composite material. This research is subdivided in two parts: The first part is to compare the results found using numerical simulation with those obtained experimentally by alternating traction tests. In this study we used the ANSYS to validate the experimental results and evaluate the life of the unidirectional composite glass / epoxy under constant amplitude loading. The numerical results of these tests were also able to trace the curve of Wöhler using the criterion of life which corresponds to a total rupture of the specimen. This curve shows a dispersion of life in the case of trials. The second part presents the numerical results of life simulation of this material under block loading variable amplitude in three stress level cases.

Research paper thumbnail of Finite element based fatigue analysis of 6082 Aluminum alloy under random loading

Mechanical and structural components are subject in the most cases during their services to rando... more Mechanical and structural components are subject in the most cases during their services to random loading. For this reason, it is necessary to reduce the complex history of these kinds of loading in a series of constant amplitude cycles. There are several counting methods that lead to different results. Among all these methods, it is recognized that the Rainflow Cycle Counting method provides the most conservative results. In this paper, a finite elements analysis technique is presented to predict the fatigue life using this method associate with the S-N method which is used for high cycle fatigue applications that makes no distinction between initiation or growing a crack, but rather, predicts the total life to failure. Comparison between numerical and experimental results is considering in this paper.

Research paper thumbnail of Comparative Study of Fatigue Damage Models Using Different Number of Classes Combined with the Rainflow Method

Engineering, Technology & Applied Science Research, 2013

Fatigue damage increases with applied load cycles in a cumulative manner. Fatigue damage models p... more Fatigue damage increases with applied load cycles in a cumulative manner. Fatigue damage models play a key role in life prediction of components and structures subjected to random loading. The aim of this paper is the examination of the performance of the “Damaged Stress Model”, proposed and validated, against other fatigue models under random loading before and after reconstruction of the load histories. To achieve this objective, some linear and nonlinear models proposed for fatigue life estimation and a batch of specimens made of 6082T6 aluminum alloy is subjected to random loading. The damage was cumulated by Miner’s rule, Damaged Stress Model (DSM), Henry model and Unified Theory (UT) and random cycles were counted with a rain-flow algorithm. Experimental data on high-cycle fatigue by complex loading histories with different mean and amplitude stress values are analyzed for life calculation and model predictions are compared.

Research paper thumbnail of A 3D analysis of crack-front shape of asymmetric repaired aluminum panels with composite patches

Frattura ed Integrità Strutturale, 2019

Through this study, a numerical simulation based on 3D in order to investigate the effect of crac... more Through this study, a numerical simulation based on 3D in order to investigate the effect of crack-front shape on the stress intensity factor and fatigue crack growth behavior of center cracked aluminum plate repaired asymmetrically with bonded composite patch. Consequently, skew degree it is a significant effect on stress intensity factor (SIF) distribution along the crack front in thick panels more than in thin panels. Moreover, fatigue life was calculated using different averaged stress intensity factor of patched panel determined from uniform crack front model and skew crack front model obtained from FEM and when comparing fatigue life values obtained from the finite element model with experimental values were shown a good agreement.

Research paper thumbnail of Finite Element Method Investigation of the Effect of Cold Expansion Process on Fatigue Crack Growth in 6082 Aluminum Alloy

Modeling and Numerical Simulation of Material Science, 2014

Cold expansion is an efficient way to improve the fatigue life of an open hole. In this paper, th... more Cold expansion is an efficient way to improve the fatigue life of an open hole. In this paper, three finite element models have been established to crack growth from an expanded hole which is simulated. Expansion and its degree influence are studied using a numerical analysis. Stress intensity factors are determined and used to evaluate the fatigue life. The residual stress field is evaluated using a nonlinear analysis and superposed with the applied stress field in order to estimate fatigue crack growth. Experimental test is conducted under constant loading. The results of this investigation indicate that expansion and its degree are a benefit of fatigue life and a good agreement was observed between FEM simulations and experimental results.

Research paper thumbnail of The Fretting Fatigue Behavior of Bolted Assemblies

Advanced Structured Materials, 2014

This study is a contribution to various scientific researches on fracture behavior of bolted join... more This study is a contribution to various scientific researches on fracture behavior of bolted joints. In our study, a three-dimensional finite element model (3D-FEM) is developed to predict the mechanical behavior of bolted joints. Fretting-fatigue tests and numerical simulations were conducted to study the effect of the clamping torque on the fatigue behavior and failure mode of bolted assemblies. The results obtained in numerical simulations are evaluated and compared with experimental results. The numerical model showed the capacity to simulate the behavior of the bolted assemblies under fatigue. Crack initiation changed from the edge of the hole to close the edge of the contact zone. A good correlation was found between the FEM simulations and the experimental results.

Research paper thumbnail of High pressure structural (B1-B2) phase transition and elastic properties of thorium chalcogenides and pnictides

Research paper thumbnail of Finite Element Simulation of Fatigue Damage Accumulation for Repaired Component by Cold Expansion Method

Applied Condition Monitoring, 2015

This manuscript investigates the effectiveness of applying the cold expansion process to extend t... more This manuscript investigates the effectiveness of applying the cold expansion process to extend the fatigue life of mechanical structures. During the cold expansion process compressive residual stresses around the expanded hole are generated. The enhancement of fatigue life and the crack initiation and growth behavior of a holed specimen were investigated by using the 6082 Aluminum alloy. The present study suggests a simple technical method for enhancement of fatigue life by a cold expansion hole of pre-cracked specimen. This technique produces beneficial high compressive residual stresses which have been predicted by means of finite element models, both 3D for proper assessment of thickness effects. Finite element models have been developed to increase their complexity, Fatigue damage accumulation of cold expanded hole in aluminum alloy which is widely used in transportation and in aeronautics was analyzed. Experimental tests were carried out using pre-cracked SENT specimens. Tests were performed in two and four block loading under constant amplitude. These tests were performed by using two and four blocks under uniaxial constant amplitude loading. The experimental results were compared to the damage calculated by the Miner’s rule and a new simple fatigue damage indicator based on an energy criterion. This comparison shows that the ‘energy criterion model’, which takes into account the loading history, yields a good estimation according to the experimental results.

Research paper thumbnail of Fatigue life estimation of components with use a non-linear energy model coupled a finite element method

MATEC Web of Conferences

The work presents a non-linear fatigue computation method together with finite element method, in... more The work presents a non-linear fatigue computation method together with finite element method, in which energy parameter has been used. The Proposed model has been used for simulation computations, based on experimental testing of Al-2024 aluminum alloy specimens subjected to two types of loads, i.e. variable blocs loading and random loading. Computations of energy parameter value have been donebased on the results of FEM elastic–plastic analysis of cyclic properties of a material. A computing Matlab-based algorithm of the fatigue life prediction methodology was developed. The proposed damage indicator is connected cycle by cycle to the Wöhler curve. Cycles were counted with the rain-flow algorithm, and damage was accumulated with this model and with the Palmgren–Miner rule. On the grounds of which fatigue life has been read off from only characteristics of specimens. An experimental verification shows a satisfactory agreement between the fatigue life calculation results by the prop...

Research paper thumbnail of Fatigue life estimation of components with use a non-linear energy model coupled a finite element method

MATEC Web of Conferences

The work presents a non-linear fatigue computation method together with finite element method, in... more The work presents a non-linear fatigue computation method together with finite element method, in which energy parameter has been used. The Proposed model has been used for simulation computations, based on experimental testing of Al-2024 aluminum alloy specimens subjected to two types of loads, i.e. variable blocs loading and random loading. Computations of energy parameter value have been donebased on the results of FEM elastic–plastic analysis of cyclic properties of a material. A computing Matlab-based algorithm of the fatigue life prediction methodology was developed. The proposed damage indicator is connected cycle by cycle to the Wöhler curve. Cycles were counted with the rain-flow algorithm, and damage was accumulated with this model and with the Palmgren–Miner rule. On the grounds of which fatigue life has been read off from only characteristics of specimens. An experimental verification shows a satisfactory agreement between the fatigue life calculation results by the prop...

Research paper thumbnail of Temperature Parameter Effect on the Fracture Behaviour of the Polymer Material: Case of Hdpe

In this study, the finite element method is used to analyze the effect of a geometric discontinui... more In this study, the finite element method is used to analyze the effect of a geometric discontinuity on the fracture behaviour of polymer material (High-Density-Polyethylene; HDPE). The effect of the temperature parameter on the distribution of stresses and strains at the notch (geometric discontinuity) has been studied. The results obtained numerically show a good correlation with experimental results. The Rice-Tracey (RT) model is used to reproduce the macroscopic mechanical behavior of the HDPE material in terms of stress versus strain for different temperature level.

Research paper thumbnail of Biomechanical Evaluation of Bone Quality Effect on Stresses at Bone-Implant Interface: A Finite Element Study

Applied and Computational Mechanics, 2020

The aim of this study is to evaluate the effect of the alveolar bone quality on von Mises stress ... more The aim of this study is to evaluate the effect of the alveolar bone quality on von Mises stress at the bone-implant interface during occlusal loading. Four (3D) finite element models of fully osteointegrated 3-mm diameter × 11.5-mm length dental implant indifferent alveolar bone with different cortical bone thickness are created, using SolidWorks computer aided design software. The alveolar bone cortical-spongy bone ratio modelled includes I) 90%-10%, II) 60%-40%, III) 40%-60%, and IV) 10%-90%. These models are then exported to ABAQUS software and stress analyses are run under an occlusal load of 70 N acting on the platform face of the dental implant. Results of this study show that the implants are subjected to similar stress distributions in all models; maximum stress values are confined in the outer cervical plate of the cortical bone around the neck. This could explain bone loss and implant de-osseointegration. Peak stresses are lowest in the model with 90% cortical bone (14.2 ...

Research paper thumbnail of Quantification Of Damage And Fatigue Life Under Random Loading

The fatigue of components and structures under real stress is a very complex process that appears... more The fatigue of components and structures under real stress is a very complex process that appears at the grain scale. The present work is to highlight a variable loading fatigue life prediction process using the Rain-flow cycle count method and cumulative damage models. Four damage cumulative models are retained and used to estimate the lifetime and to evaluate the indicator of the damage (D) namely: the model Miner, the model of the damaged stress "DSM", the theory unified and finally Henry's law. The first step of the present study consists in the implementation of the organigram of all methods (Rainflow method coupled to the cumulative damage models) in a Matlab program and the second step is estimation of the lifetime and evaluation of the damage indication in the real-time to the studied structure. Résumé La fatigue des composants et des structures sous sollicitations réelles, est un processus très complexe qui apparaît à l'échelle des grains. Le présent trava...

Research paper thumbnail of Finite Element Modeling And Analytical Solution Of A Semi-Elliptic Crack'S Jintegral

In this work, we first evaluate the J-integral rupture parameter as a function of various crack p... more In this work, we first evaluate the J-integral rupture parameter as a function of various crack parameters (crack size, rod dimensions, intensity and nature of loads) for various crack form. In a second step, and in the base of the results obtained by the finite element method, we propose formulas of the factor shape, whose implementation remains rather simple and inexpensive in terms of time, effort and means to the engineer in order to predict evolution of the rupture behavior of a cylindrical component with a semielliptical crack emerging from the surface. The comparison of the proposed analytical solution showed a good performance relatively with results of the literature.<br>

Research paper thumbnail of Numerical Analysis and Optimization of the Residual Stresses Distribution Induced by Cold Expansion Technique

Frattura ed Integrità Strutturale, 2018

This paper presents a numerical investigation about the influence of mandrel shape on residual st... more This paper presents a numerical investigation about the influence of mandrel shape on residual stresses induced by the cold expansion procedure. Thus, ball and tapered pin are used for cold expanding the plate. As, the entrance face presents the lowest residual stresses throughout the hole thickness, we propose to solve this problem by varying the mandrel taper degree, instead of applying a double expansion. The obtained results show that the tapered pin is more suitable for the cold expansion. More, low taper increases the residual stresses at the entrance, reaching the values generated at the exit face.

Research paper thumbnail of Prediction the life of the composite material to a fatigue test

The goal of this work is to assessing the life of the composite material. This research is subdiv... more The goal of this work is to assessing the life of the composite material. This research is subdivided in two parts: The first part is to compare the results found using numerical simulation with those obtained experimentally by alternating traction tests. In this study we used the ANSYS to validate the experimental results and evaluate the life of the unidirectional composite glass / epoxy under constant amplitude loading. The numerical results of these tests were also able to trace the curve of Wöhler using the criterion of life which corresponds to a total rupture of the specimen. This curve shows a dispersion of life in the case of trials. The second part presents the numerical results of life simulation of this material under block loading variable amplitude in three stress level cases.

Research paper thumbnail of Finite element based fatigue analysis of 6082 Aluminum alloy under random loading

Mechanical and structural components are subject in the most cases during their services to rando... more Mechanical and structural components are subject in the most cases during their services to random loading. For this reason, it is necessary to reduce the complex history of these kinds of loading in a series of constant amplitude cycles. There are several counting methods that lead to different results. Among all these methods, it is recognized that the Rainflow Cycle Counting method provides the most conservative results. In this paper, a finite elements analysis technique is presented to predict the fatigue life using this method associate with the S-N method which is used for high cycle fatigue applications that makes no distinction between initiation or growing a crack, but rather, predicts the total life to failure. Comparison between numerical and experimental results is considering in this paper.

Research paper thumbnail of Comparative Study of Fatigue Damage Models Using Different Number of Classes Combined with the Rainflow Method

Engineering, Technology & Applied Science Research, 2013

Fatigue damage increases with applied load cycles in a cumulative manner. Fatigue damage models p... more Fatigue damage increases with applied load cycles in a cumulative manner. Fatigue damage models play a key role in life prediction of components and structures subjected to random loading. The aim of this paper is the examination of the performance of the “Damaged Stress Model”, proposed and validated, against other fatigue models under random loading before and after reconstruction of the load histories. To achieve this objective, some linear and nonlinear models proposed for fatigue life estimation and a batch of specimens made of 6082T6 aluminum alloy is subjected to random loading. The damage was cumulated by Miner’s rule, Damaged Stress Model (DSM), Henry model and Unified Theory (UT) and random cycles were counted with a rain-flow algorithm. Experimental data on high-cycle fatigue by complex loading histories with different mean and amplitude stress values are analyzed for life calculation and model predictions are compared.

Research paper thumbnail of A 3D analysis of crack-front shape of asymmetric repaired aluminum panels with composite patches

Frattura ed Integrità Strutturale, 2019

Through this study, a numerical simulation based on 3D in order to investigate the effect of crac... more Through this study, a numerical simulation based on 3D in order to investigate the effect of crack-front shape on the stress intensity factor and fatigue crack growth behavior of center cracked aluminum plate repaired asymmetrically with bonded composite patch. Consequently, skew degree it is a significant effect on stress intensity factor (SIF) distribution along the crack front in thick panels more than in thin panels. Moreover, fatigue life was calculated using different averaged stress intensity factor of patched panel determined from uniform crack front model and skew crack front model obtained from FEM and when comparing fatigue life values obtained from the finite element model with experimental values were shown a good agreement.

Research paper thumbnail of Finite Element Method Investigation of the Effect of Cold Expansion Process on Fatigue Crack Growth in 6082 Aluminum Alloy

Modeling and Numerical Simulation of Material Science, 2014

Cold expansion is an efficient way to improve the fatigue life of an open hole. In this paper, th... more Cold expansion is an efficient way to improve the fatigue life of an open hole. In this paper, three finite element models have been established to crack growth from an expanded hole which is simulated. Expansion and its degree influence are studied using a numerical analysis. Stress intensity factors are determined and used to evaluate the fatigue life. The residual stress field is evaluated using a nonlinear analysis and superposed with the applied stress field in order to estimate fatigue crack growth. Experimental test is conducted under constant loading. The results of this investigation indicate that expansion and its degree are a benefit of fatigue life and a good agreement was observed between FEM simulations and experimental results.

Research paper thumbnail of The Fretting Fatigue Behavior of Bolted Assemblies

Advanced Structured Materials, 2014

This study is a contribution to various scientific researches on fracture behavior of bolted join... more This study is a contribution to various scientific researches on fracture behavior of bolted joints. In our study, a three-dimensional finite element model (3D-FEM) is developed to predict the mechanical behavior of bolted joints. Fretting-fatigue tests and numerical simulations were conducted to study the effect of the clamping torque on the fatigue behavior and failure mode of bolted assemblies. The results obtained in numerical simulations are evaluated and compared with experimental results. The numerical model showed the capacity to simulate the behavior of the bolted assemblies under fatigue. Crack initiation changed from the edge of the hole to close the edge of the contact zone. A good correlation was found between the FEM simulations and the experimental results.

Research paper thumbnail of High pressure structural (B1-B2) phase transition and elastic properties of thorium chalcogenides and pnictides

Research paper thumbnail of Finite Element Simulation of Fatigue Damage Accumulation for Repaired Component by Cold Expansion Method

Applied Condition Monitoring, 2015

This manuscript investigates the effectiveness of applying the cold expansion process to extend t... more This manuscript investigates the effectiveness of applying the cold expansion process to extend the fatigue life of mechanical structures. During the cold expansion process compressive residual stresses around the expanded hole are generated. The enhancement of fatigue life and the crack initiation and growth behavior of a holed specimen were investigated by using the 6082 Aluminum alloy. The present study suggests a simple technical method for enhancement of fatigue life by a cold expansion hole of pre-cracked specimen. This technique produces beneficial high compressive residual stresses which have been predicted by means of finite element models, both 3D for proper assessment of thickness effects. Finite element models have been developed to increase their complexity, Fatigue damage accumulation of cold expanded hole in aluminum alloy which is widely used in transportation and in aeronautics was analyzed. Experimental tests were carried out using pre-cracked SENT specimens. Tests were performed in two and four block loading under constant amplitude. These tests were performed by using two and four blocks under uniaxial constant amplitude loading. The experimental results were compared to the damage calculated by the Miner’s rule and a new simple fatigue damage indicator based on an energy criterion. This comparison shows that the ‘energy criterion model’, which takes into account the loading history, yields a good estimation according to the experimental results.

Research paper thumbnail of Fatigue life estimation of components with use a non-linear energy model coupled a finite element method

MATEC Web of Conferences

The work presents a non-linear fatigue computation method together with finite element method, in... more The work presents a non-linear fatigue computation method together with finite element method, in which energy parameter has been used. The Proposed model has been used for simulation computations, based on experimental testing of Al-2024 aluminum alloy specimens subjected to two types of loads, i.e. variable blocs loading and random loading. Computations of energy parameter value have been donebased on the results of FEM elastic–plastic analysis of cyclic properties of a material. A computing Matlab-based algorithm of the fatigue life prediction methodology was developed. The proposed damage indicator is connected cycle by cycle to the Wöhler curve. Cycles were counted with the rain-flow algorithm, and damage was accumulated with this model and with the Palmgren–Miner rule. On the grounds of which fatigue life has been read off from only characteristics of specimens. An experimental verification shows a satisfactory agreement between the fatigue life calculation results by the prop...

Research paper thumbnail of Fatigue life estimation of components with use a non-linear energy model coupled a finite element method

MATEC Web of Conferences

The work presents a non-linear fatigue computation method together with finite element method, in... more The work presents a non-linear fatigue computation method together with finite element method, in which energy parameter has been used. The Proposed model has been used for simulation computations, based on experimental testing of Al-2024 aluminum alloy specimens subjected to two types of loads, i.e. variable blocs loading and random loading. Computations of energy parameter value have been donebased on the results of FEM elastic–plastic analysis of cyclic properties of a material. A computing Matlab-based algorithm of the fatigue life prediction methodology was developed. The proposed damage indicator is connected cycle by cycle to the Wöhler curve. Cycles were counted with the rain-flow algorithm, and damage was accumulated with this model and with the Palmgren–Miner rule. On the grounds of which fatigue life has been read off from only characteristics of specimens. An experimental verification shows a satisfactory agreement between the fatigue life calculation results by the prop...