Publications by Year: 2021

2021
Heddar Y, Djebabra M, Saadi S. Contribution to the quantitative study of violence in Algerian hospital environment. 11th Annual International Conference on Industrial Engineering and Operations Management [Internet]. 2021. Publisher's VersionAbstract
The workplace, and more particularly the healthcare sector, has recently experienced a staggering increase in violence. These aggressive behaviors are resulting in considerable consequences on healthcare workers, both in terms of mental and physical health. In light of this observation, this study aims to provide a quantitative analysis of the potential causes leading to violence in Algerian hospitals, which have become the place where tensions arise, especially during these uncertain times caused by the COVID-19 pandemic. Therefore, we started with conducting a field survey, in order to highlight the main causes behind this violence, as well as the strategy in terms of how it is managed as a risk. Then we used ISHIKAWA diagrams to classify predefined causes into several categories and anticipate the likelihood of such violent behaviors. Finally, the results of this study revealed that working conditions were the main cause of violence in Algerian hospitals. In order to remedy this gap, we recommend improving the healthcare staff well-being, as well as prioritizing proactive measures preventing violent behaviors.
Heddar Y, Djebabra M. Etude des comportements des conducteurs : cas de la limitation de vitesses à l’entrée de la ville de Batna-Algérie. Conférence nationale sur les accidents de la route en Algérie : causes, défis et solutions. 06 Décembre. 2021.
Bousfot W, Saadi S. Etude exploratoire de la performance des CPHS dans les entreprises pétrolières algériennes. Conférence internationale sur la contribution de la sécurité industrielle dans la prévention des accidents de travail et maladies professionnelles, les 07-08 Décembre. 2021.
Heddar Y, Djebabra M. Exploration des comportements des étudiants universitaires à l’ère de la pandémie COVID-19. Conférence internationale sur la contribution de la sécurité industrielle dans la prévention des accidents de travail et maladies professionnelles, les 07-08 Décembre. 2021.
Bensmaine O, Naït-Said R, Zidani F. Failure modes, effects, and diagnostic analysis (FMEDA) of ESD Valves in oil and gas industry. 1st Asia Pacific Industrial Engineering and and Operations Management Conference virtually, July 9-11 [Internet]. 2021. Publisher's VersionAbstract
The Safety Instrumented System (SIS) is an automated system used to implement one or more safety instrumented functions. A SIS, like the Emergency Shutdown (ESD) system, consists of any combination of sensor(s), safety PLC(s) and final element(s) (e.g. ESD valves). ESD valves are the last line of defense against risks, although the ESD valve has high performance, the data (based on expert judgment and OREDA database) indicates that ESD valves failures are the most critical in the ESD systems. In order to improve the reliability and safety of these valves, we applied the FMEDA diagnostic technique. We started with a decomposition of the ESD valve to the subsystems and we identified their functions. Then we described the failure modes, their mechanisms, their sites and their effects. Then we identified the impact of each failure mode according to the criticality classes and identified the failure rates and their class according to the criticality and the detectability by automatic diagnosis of each mode and from the failure rates we calculated the Safe Failure Fraction (SFF) and Safety Integrity Level (SIL) required and we concluded that the actuator subsystem is the most critical system. Finally, we proposed preventive and protective measures to eliminate or reduce the risk of failure.
Bennouna A, Boughaba A. Perception des risques psychosociaux en milieu hospitalier : evaluation et prévention. المؤتمر الدولي الافتراضي حول المخاطر النفسية الاجتماعية في مجال العمل -التقييم و الوقاية على ضوء التجارب الإفريقية و الفرنسية. 2021.
Ameddah H, Mazouz H. 3D Printing Analysis by Powder Bed Printer (PBP) of a Thoracic Aorta Under Simufact Additive. In: Research Anthology on Emerging Technologies and Ethical Implications in Human Enhancement. ; 2021. pp. 774-785.Abstract
In recent decades, vascular surgery has seen the arrival of endovascular techniques for the treatment of vascular diseases such as aortic diseases (aneurysms, dissections, and atherosclerosis). The 3D printing process by addition of material gives an effector of choice to the digital chain, opening the way to the manufacture of shapes and complex geometries, impossible to achieve before with conventional methods. This chapter focuses on the bio-design study of the thoracic aorta in adults. A bio-design protocol was established based on medical imaging, extraction of the shape, and finally, the 3D modeling of the aorta; secondly, a bio-printing method based on 3D printing that could serve as regenerative medicine has been proposed. A simulation of the bio-printing process was carried out under the software Simufact Additive whose purpose is to predict the distortion and residual stress of the printed model. The binder injection printing technique in a Powder Bed Printer (PBP) bed is used. The results obtained are very acceptable compared with the results of the error elements found.
Mekhloufi R, Boussaha A, Benbouta R, Baroura L. Anisotropic and Isotropic Elasticity Applied for the Study of Elastic Fields Generated by Interfacial Dislocations in a Heterostructure of InAs/(001)GaAs Semiconductors. Journal of Solid Mechanics [Internet]. 2021;13 (4) :503-512. Publisher's VersionAbstract
This work is a study of the elastic fields’ effect (stresses and displacements) caused by dislocations networks at a heterostructure interface of a InAs / GaAs semiconductors thin system in the cases of isotropic and anisotropic elasticity. The numerical study of this type of heterostructure aims to predict the behavior of the interface with respect to these elastic fields satisfying the boundary conditions. The method used is based on a development in Fourier series. The deformation near the dislocation is greater than the other locations far from the dislocation.     
Selloum R, Ameddah H, Brioua M. Computer Aided Inspection by Reverse Engineering for Reproduction of Gear Teeth. 5th Tunisian Congress on Mechanics  COTUME 2020  22 au 24 Mars [Internet]. 2021. Publisher's VersionAbstract

In the industry, automated inspection is important for ensuring the high quality and allows acceleration of procedures for quality control of parts or mechanical assemblies. Although significant progress has been made in precision machining of complex surfaces, precision inspection of such surfaces remains a difficult problem. Thus the problem of the conformity of the parts of complex geometry is felt more and more. Motivated by the need to increase quality and reduce costs, and supported by the progress made in the field of it as well as the automation of production which in recent years has seen a considerable evolution in all these stages: from design to control through manufacturing. Due to, we used a 3D computer aided inspection technique on a physical gear using a coordinate measuring machine equipped with a “PC-DMIS” measurement and inspection software. Our work consists in developing a procedure for inspection for reproduction of gear profile by reconstruction of a circle involute gear from a cloud point’s measurement. In order to obtain a reliable result. In this works, we design the CAD-model of the part as accurately as possible (using a mathematical model) and matched with the 3D points cloud that represents the measurement that obtained from scanner. we compare the measurement cloud points from coordinate measurement machine with the mathematical model of construction by ICP (Iterative Closest Point) methods in order to obtain a conformed result and to show the impact of the dimensional inspection and geometric.

Alkebsi EAA, Ameddah H, OUTTAS T, Almutawakel A. Design of graded lattice structures in turbine blades using topology optimization. International Journal of Computer Integrated Manufacturing [Internet]. 2021;34 (4). Publisher's VersionAbstract
Designing and manufacturing lattice structures with Topology Optimization (TO) and Additive Manufacturing (AM) techniques is a novel method to create light-weight components with promising potential and high design flexibility. This paper proposes a new design of lightweight-graded lattice structures to replace the internal solid volume of the turbine blade to increase its endurance of high thermal stresses effects. The microstructure design of unit cells in a 3D framework is conducted by using the lattice structure topology optimization (LSTO) technique. The role of the LSTO is to find an optimal density distribution of lattice structures in the design space under specific stress constraints and fill the inner solid part of the blade with graded lattice structures. The derived implicit surfaces modelling is used from a triply periodic minimal surfaces (TPMS) to optimize the mechanical performances of lattice structures. Numerical results show the validity of the proposed method. The effectiveness and robustness of the constructed models are analysed by using finite element analysis. The simulation results show that the graded lattice structures in the improved designs have better efficiency in terms of lightweight (33.41–40.32%), stress (25.52–48.55%) and deformation (7.35–19.58%) compared to the initial design.
Chichoune S, Rebiai C, Bahloul E. AN EFFECTIVE STRAIN BASED SOLID ELEMENT FOR LINEAR ANALYSIS. 7th International Scientific Researches Conference, September 7-8,. 2021.
Mansouri S, Klaa E. Épreuve de qualification des soudeurs selon la norme 9606-1-2013 Soudage par fusion des aciers. 1ères Journées Nationales des Sciences des Matériaux (JNSM2021), les 17 et 18 Novembre. 2021.
Ameddah H, Lounansa S, Mazouz H. Fatigue behavior study of the biodegradabe cardiovascular stent. 5th Tunisian Congress on Mechanics  COTUME 2020  Hammamet 22 au 24 Mars [Internet]. 2021. Publisher's VersionAbstract

In recent years the development of health science to improve people’s lives and reduce the death rate from cardiovascular disease, researchers have invested in the solution of stents to treat cardiovascular disease. Usually a permanent implant (metal stent) is used to treat a temporary disease, effective on elastic recoil and negative remodeling, but promoting intimate proliferation. This is combated by an active stent, which nevertheless induces chronic inflammation and delayed healing (because of active drugs), with the risk of late thrombosis. The idea of resolution leads to the study of the behavior of temporary stent biodegradable and bioresorbable, once the healing process is completed. The purpose of this study is to reduce the disadvantages of metal stents, to do this; a biodegradable material (polylactic acid) is used. The fatigue behavior of a stent after its placement using geometric parameters selected from clinical cases (diastole and systole). A finite element numerical study in the field of biomaterial fatigue is proposed in order to investigate and understand the biodegradable behavior of the stent. The results of the numerical study show the predicted lifetime of the biodegradable fragrance.

Ameddah H, Selloum R, Brioua M. Inspection on a Three-Dimensional Measuring Machine for a Virtual Model for Additive Manufacturing, in International Conference on Advances in Mechanical Engineering and Mechanics. Advances in Mechanical Engineering, Materials and Mechanics ; 2021 :138–143. Publisher's VersionAbstract
Today, and to quickly meet the high demands of variability, supply chain efficiency and energy optimization, business markets are looking for modern manufacturing technologies and as a solution, industry 4.0 is using the benefits of integrating modern manufacturing technologies and information systems to promote production capabilities. In this context, intelligent industry represents a new generation of automatic production systems based on the concepts of intelligent industry, intelligent manufacturing, control and intelligent inspection, such as inspection on coordinate measuring machines (CMMs). This technology allows many machines to be integrated into a plant and controlled online using the MBD (Model Based Design) quality system. The problem of conformity of parts with complex geometry is becoming more and more important. The objective of this work is to present a 3D inspection technique on a virtual model (MBD: Model Based Design), using a coordinate measuring machine equipped with a “POWER INSPECT” measurement and inspection software. The interest of this technique is to show the impact of the dimensional inspection and geometric tolerance process of the CAD model for the CAI (Computer aided Inspection) approach on the fidelity of the finished product for additive manufacturing (AM) including intelligent industry.
Ameddah H. Integrated Kinematic Machining Error Compensation for Impeller Rough Tool Paths Programming in a Step-Nc Format Using Neural Network Approach Prediction. In: Artificial Neural Network Applications in Business and Engineering. Vol. 7. ; 2021. pp. 144-170.Abstract
The most important components used in aerospace, ships, and automobiles are designed with free form surfaces. An impeller is one of the most important components that are difficult to machine because of its twisted blades. This research book is based on the premise that a STEP-NC program can document “generic” manufacturing information for an impeller. This way, a STEP-NC program can be made machine-independent and has an advantage over the conventional G-code-based NC program that is always generated for a specific CNC machine. Rough machining is recognized as the most crucial procedure influencing machining efficiency and is critical for the finishing process. The research work reported in this chapter focuses on introduces a fully STEP-compliant CNC by putting forward an interpolation algorithm for non uniform rational basic spline (NURBS) curve system for rough milling tool paths with an aim to solve the problems of kinematic errors solutions in five axis machine by neural network implementation.
Rebiai C. A new membrane finite element based on the strain Formulation for the analysis of 2-D structures. International Asian Congress on Contemporary Sciences-v June 1-2,. 2021.
Rebiai C, and Bahloul E. A new strain based membrane element for dynamic elastoplastic analysis. SÉMINAIRE INTERNATIONAL SUR L’INDUSTRIE ET LA TECHNOLOGIE en ligne (webinaire), organisé par Algerian Journal of Engineering, Architecture and Urbanism le 12 et 13 Mars. 2021.
Rebiai C, Saidani N, Bahloul E. NUMERICAL INVESTIGATION IN ELASTOPLASTIC DYNAMIC PROBLEMS BY STRAIN BASED APPROACH. Symposium on Scientific Research- 3 October 29-30,. 2021.
Bouakkar L, Ameddah H, Mazouz H. A Particle Swarm Optimization-Based Approach for Finding Reliability in a Total Hip Prosthesis. In: Artificial Neural Network Applications in Business and Engineering. Vol. 10. ; 2021. pp. 222-242.Abstract
Nowadays, we assist the global extension of reliability optimization problems from the design phase of systems and sub-systems to the design and operational phases, not only of systems and sub-systems, but also of bio functionality design. This chapter investigates the relative performances of particle swarm optimization (PSO) variants when used to find reliability in the total hip prosthesis by finding the maximization of jumping distance (JD) to avoid dislocation and the minimization of system’s stability to offer mobility. Statistical analysis of different cases of head diameters of 22, 28, 36, 40 mm has been conducted to survey the convergence and relative performances of the main PSO variants when applied to solve reliability in the total hip prosthesis.
Khalid F, Manaa R, Saad S, Ameddah H. A Study of the Thermo-Mechanical Behavior of a Gas Turbine Blade in Composite Materials Reinforced with Mast. Revue des Composites et des Matériaux Avancés [Internet]. 2021;31 (2) :101-108. Publisher's VersionAbstract
The turbine blades are subjected to high operating temperatures and high centrifugal tensile stress due to rotational speeds. The maximum temperature at the inlet of the turbine is currently limited by the resistance of the materials used for the blades. The present paper is focused on the thermo-mechanical behavior of the blade in composite materials with reinforced mast under two different types of loading. The material studied in this work is a composite material, the selected matrix is a technical ceramic which is alumina (aluminum oxide Al2O3) and the reinforcement is carried out by short fibers of high modulus carbon to optimize a percentage of 40% carbon and 60% of ceramics. The simulation was performed numerically by Ansys (Workbench 16.0) software. The comparative analysis was conducted to determine displacements, strains and Von Mises stress of composite material and then compared to other materials such as Titanium Alloy, Stainless Steel Alloy, and Aluminum 2024 Alloy. The results were compared in order to select the material with the best performance in terms of rigidity under thermomechanical stresses. While comparing these materials, it is found that composite material is better suited for high temperature applications. On evaluating the graphs drawn for, strains and displacements, the blade in composite materials reinforced with mast is considered as optimum.

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