A. Sahli

Université Djilali de Sidi Bel Abbès

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Smaïl Benbarek

Université Djilali de Sidi Bel Abbès

O. Rahmani

University of Shahrood

Said Kebdani

Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf

Ismail Boudjemaa

Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf

B. Bachir Bouiadjra

Université Djilali de Sidi Bel Abbès

Abdelmadjid Moulgada

Université IBN Khaldoun Tiaret

Sara Sahli

Université d'Oran 2

Ait Kaci Djafar

Université Djilali de Sidi Bel Abbès

Abdelkader Benkhettou

Université Djilali de Sidi Bel Abbès

B. Sérier

Université Djilali de Sidi Bel Abbès

Cooperative Institutions

Université Djilali de Sidi Bel Abbès

Laboratory of Mechanics Physics of Materials

Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf

Université Ibn Khaldoun

Université IBN Khaldoun Tiaret

Saudi Center for Disease Prevention and Control

Université Mustapha Stambouli de Mascara

Université Oran 1 Ahmed Ben Bella

Recep Tayyip Erdoğan University

École Nationale Polytechnique d'Oran

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The effect of an innovative sandwich-structure liner on stress distribution in the residual limb: A transtibial Amputation model

Mechanics of Advanced Materials and Structures (2025)

Ismail Boudjemaa Omar Khatir Abdelkader Benkhettou A. Sahli Ghali Drici

10.1080/15376494.2025.2464256

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Citations (0)

Numerical simulation of the femur fracture under static loading

STRUCTURAL ENGINEERING AND MECHANICS (2016)

Zagane Mohammed El Sallah Smaïl Benbarek A. Sahli B. Bachir Bouiadjra B. Sérier

Bone is a living material with a complex hierarchical structure that gives it remarkable mechanical properties. Bone constantly undergoes mechanical. Its quality and resistance to fracture is constantly changing over time through the process of bone remodeling. Numerical modeling allows the study of the bone mechanical behavior and the prediction of different trauma caused by accidents without expose humans to real tests. The aim of this work is the modeling of the femur fracture under static solicitation to create a numerical model to simulate this element fracture. This modeling will contribute to improve the design of the indoor environment to be better safe for the passengers' transportation means. Results show that vertical loading leads to the femur neck fracture and horizontal loading leads to the fracture of the femur diaphysis. The isotropic consideration of the bone leads to bone fracture by crack propagation but the orthotropic consideration leads to the fragmentation of the bone.

Orthotropic material

Diaphysis

Bone fracture

10.12989/sem.2016.60.3.405

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Citations (9)

Stress intensity solutions for cracked plates by the dual boundary method

Strength of Materials (2007)

A. Sahli D. Boutchicha A. Belarbi O. Rahmani

Internal pressure

Tension (geology)

Intensity

10.1007/s11223-007-0057-6

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Citations (3)

Experimental and numerical disbond localization analyses of a notched plate repaired with a CFRP patch

STRUCTURAL ENGINEERING AND MECHANICS (2017)

A. Sahli Bouziane M. Mokhtar Smaïl Benbarek Steven F. Wayne Liang Zhang

Through the use of finite element analysis and acoustic emission techniques we have evaluated the interfacial failure of a carbon fiber reinforced polymer (CFRP) repair patch on a notched aluminum substrate. The repair of cracks is a very common and widely used practice in the aeronautics field to extend the life of cracked sheet metal panels. The process consists of adhesively bonding a patch that encompasses the notched site to provide additional strength, thereby increasing life and avoiding costly replacements. The mechanical strength of the bonded joint relies mainly on the bonding of the adhesive to the plate and patch stiffness. Stress concentrations at crack tips promote disbonding of the composite patch from the substrate, consequently reducing the bonded area, which makes this a critical aspect of repair effectiveness. In this paper we examine patch disbonding by calculating the influence of notch tip stress on disbond area and verify computational results with acoustic emission (AE) measurements obtained from specimens subjected to uniaxial tension. The FE results showed that disbonding first occurs between the patch and the substrate close to free edge of the patch followed by failure around the tip of the notch, both highest stress regions. Experimental results revealed that cement adhesion at the aluminum interface was the limiting factor in patch performance. The patch did not appear to strengthen the aluminum substrate when measured by stress-strain due to early stage disbonding. Analysis of the AE signals provided insight to the disbond locations and progression at the metaladhesive interface. Crack growth from the notch in the aluminum was not observed until the stress reached a critical level, an instant before final fracture, which was unaffected by the patch due to early stage disbonding. The FE model was further utilized to study the effects of patch fiber orientation and increased adhesive strength. The model revealed that the effectiveness of patch repairs is strongly dependent upon the combined interactions of adhesive bond strength and fiber orientation.

Acoustic Emission

10.12989/sem.2017.63.3.361

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Citations (5)

Numerical simulation of the femur fracture for different cemented hip femoral prosthesis under forces during stumbling

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

El Mohammed A. Sahli Ali Benouis Smail Benbarek

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Effect of multi-layer prosthetic foam liner on the stresses at the stump–prosthetic interface

Frattura ed Integrità Strutturale (2021)

Ismail Boudjemaa A. Sahli Abdelkader Benkhettou Smaïl Benbarek

The prosthetic liner plays a significant role in the redistribution of the pressure between the stump and the socket, as it adding a cushioning layer between the stump and the socket which relieves pain and makes the prosthesis more comfortable. This study employed nonlinear finite element analyses to investigate the peak pressure and shear stress at stump–prosthetic interface in the case of multi-layer prosthetic foam liner, this liner having an inner polymeric foam layer Surrounded by another type of polymeric foam layer, we used three different types of foams in different order to define this liner (flexible polyurethane foam, polyurethane-shape memory polymer foam, and natural rubber latex foam). That’s allows comparing 6 deferent configuration of multi-layer prosthetic foam liner.

Cushioning

Foam concrete

10.3221/igf-esis.56.15

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Citations (7)

Optimizing mechanical behavior of middle ear prosthesis using finite element method with material degradation FGM in three functions

Mechanics of Advanced Materials and Structures (2024)

Omar Khatir S.M. Fekih A. Sahli Ismail Boudjemaa Abdelkader Benkhettou

Advancements in technology have revolutionized healthcare, with notable impacts on auditory health. This study introduces a novel approach aimed at optimizing materials for middle ear prostheses to enhance auditory performance. We developed a finite element (FE) model of the ear incorporating a pure titanium TORP prosthesis, validated against experimental data. Subsequently, we applied Functionally Graded Materials (FGM) methodology, utilizing linear, exponential, and logarithmic degradation functions to modify prosthesis materials. Biocompatible materials suitable for auditory prostheses, including Stainless Steel, titanium, and Hydroxyapatite, were investigated. Our findings indicate that combinations such as Stainless Steel with titanium and Hydroxyapatite offer improved outcomes compared to pure titanium and Hydroxyapatite ceramic, in terms of both displacement and stress. Additionally, personalized prostheses tailored to individual patient needs are feasible, underscoring the potential for further advancements in auditory healthcare.

10.1080/15376494.2024.2350677

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Citations (10)

Preliminary results on the effects of orthopedic implant stiffness fixed to the cut end of the femur on the stress at the stump-prosthetic interface

Frattura ed Integrità Strutturale (2021)

Ismail Boudjemaa A. Sahli Abdelkader Benkhettou Smaïl Benbarek

A lot of trans-femoral amputation patients experience skin breakdown due to the pressures and shear stresses in the stump-prosthesis interface. In this study, a finite element model was employed to investigate the stresses at the stump interface in the case of an orthopedic implant fixed to the cut end of the femur. By changing the stiffness of this implant, we aim to see how the stiffness of this implant affects the stresses in the interface between the amputated limb and the prosthesis. To find out the effects of implant stiffness, five values for the elastic modulus, ranging from 0.1 to 0.5 Mpa, with an interval of 0.1 Mpa were employed in the implant structure of the FE model. Obtained results show that the implant played important role in reducing the stresses at the stump-prosthesis interface where the contact pressure did not exceed 53 Kpa and 17.3 Kpa for shear stress in the stiffer case of an implant, while the contact pressure in the case of femur without implant exceeded 79Kpa and 42 Kpa for shear stress. We also noted that the intensity of the contact pressure and the shear stress is proportional to the stiffness of the implant, as the greater the implant stiffness, the higher the peak of these stresses.

Stress shielding

Contact Mechanics

10.3221/igf-esis.57.13

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Citations (3)

Simulation of the Chip Formation and Temperature Distribution by the Fem

Journal of Applied Sciences (2015)

M. B. Guemmour A. Sahli Said Kebdani Sara Sahli

A B S T R A C TThe distribution of temperature, the deformations and the cutting forces in the cutting zone during chip formation are very important aspects of the process.Therefore, they have great influence in results of machining.Tool wear, the precision of the machining operations and the finishing superface are some of the results that affect the economy of the process.This study has the objective of an evaluation offered potentialities for simulating chip formation using Finite Element Method (FEM).Four models with sufficiently different principles are used to exploring the most recent innovations.In the models, WC tools coated TiN was used to machine AISI 4340 steel.The simulations provide a study and detailed examination of temperature distribution, deformations, cutting forces, flow of material and an enormous amount of information that could be useful for the analysis of new processes and optimization of existing processes.Additionally, they open new horizon in the study of the chip formation.The simulations also demonstrate the complexity of the chip formation process, which creates many difficulties for its analysis using based analytical equations in constants.Some comparisons are established with experimental results found in temperature measurements.

10.3923/jas.2015.1138.1148

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Citations (4)

Crack Length Estimation from the Damage Modelisation around a Cavityi in the Orthopedic Cement of the Total Hip Prosthesis

Key engineering materials (2013)

Smaïl Benbarek A. Sahli Mohamed Mokhtar Bouziane B. Bachir Bouiadjra B. Sérier

In orthopedic surgery and particularly in the total hip arthroplasty, the stem fixation is performed in general using a surgical cement which consists essentially of polymer (PMMA). Fracture of cement and prosthesis loosening appears after a high-stress level. This phenomenon origin is due to the presence of micro-cavities in the PMMA volume. The focus of our study is the modeling using the finite-element method of the cement damage around these cavities, the cavities' sizes and shapes effect on the damage risk, and the crack length estimation due to this damage. A small Fortran schedule was incorporated with the Abaqus code to calculate the damage zone. Results show that the presence of a cavity in the cement increases the damage parameter. The damage appears when the cavity is located in cement on the loading axis. If the cavity changes its shape from circular to elliptical, the size of the damage zone increases. One can predict the initiation of a crack in cement with a maximal length of 70μm.Keywords: total hip prosthesis, crack, bone cement, biomechanics, damage.

Bone cement

10.4028/www.scientific.net/kem.577-578.345

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Citations (3)