Bezazi Abderrezak

• PhD
• Head of Department at University of Guelma

O objetivo do trabalho foi fazer um estudo através do Ensaio de Flexão em 3 pontos de painéis sanduiches utilizando faces de material compósito com fibras de Juta submetidas a tratamento alcalino em matriz de resina epóxi comparando com fases do compósito feitas sem reforço de fibras. Foi estudado também o comportamento de diferentes materiais no n...

This study investigates the incorporation of date palm fibers, an abundant agricultural waste, into polyvinyl chloride (PVC) composites at a 25% fiber weight ratio. Alkali treatment, potassium permanganate oxidation, and silane coupling were applied to enhance fiber‐matrix adhesion. The composites were fabricated using a hot pressing method. The re...

The application of lignocellulosic fibers to reinforce mortars with cementitious matrices was investigated for possible use in non-structural applications. A Box-Behnken design L29 (BBDL29) experimental design, using the response surface method (RSM), was used to obtain the combination that maximizes the bending stress and modulus. Four input param...

The primary objective of this study is to predict the sensitivity of the mechanical properties in unidirectional layers of bio-composites. Four bio-sourced fibers were investigated: PALF (Pineapple leaf fiber), Date palm, Alfa, and Hemp fiber. In order to conduct this sensitivity analysis, three models were implemented. The first model utilizes ana...

Sandwich panels are widely used in the Naval and Aerospace industries. The panel core, in turn, must keep the faces apart and be rigid perpendicular to them. In this work, a study was carried out using a 3-point flexural test of sandwich panels using composite material faces with Sisal fibers subjected to alkaline treatment with 10% by weight of so...

Sandwich panels are widely used in the naval and aerospace industries to withstand the normal tensile, compressive, and shear stresses associated with bending. The faces of sandwich composites are usually made of metals such as aluminum and, in some studies with composites, using a polymeric matrix, but there are no studies in the literature using...

In modern society, polymer composites are widely used due to their high strength/weight ratio, among other properties. In recent times due to environmental issues and higher costs, most industries and engineering sectors are trying to reduce the use of synthetic fibers by using natural fibers or lignocellulosic fibers. New composite materials using...

Stress concentrations pose a significant challenge in designing and optimizing composite components, often resulting in structural alterations and crack formation. This study delves into a detailed numerical and analytical analysis of stress concentration factors in composite materials, with a specific focus on the influence of negative Poisson's r...

The layered fibers of carbon-fiber-reinforced polymer (CFRP) composites exhibit low thermal conductivity (TC) throughout their thickness due to the poor TC of the polymeric resin. Improved heat transmission inside the hydrogen storage tank during the filling process can reduce further compression work, and improved heat insulation can minimize ener...

This paper explores the incorporation of aramid fibers, recognized for their high mechanical flexibility and low thermal conductivity (TC), to serve as reinforcing agents within the highly porous aerogel matrix in order to overcome their fragility and weak mechanical structure that impose limitations on their practical utility especially in piping...

This paper is dedicated to the implementation of a numerical model of corroded pipelines using the finite element method. This last model was carried out on the commercial software ANSYS Apdl. A numerical model of a pipeline with one defect was made to validate the results of the bursting stress. This results have been compared with data and result...

Carbon dioxide emissions due to fossil fuels cause environmental problems, global warmingand climatic change, hence the need to replace them with renewable energy sources is necessary and amongthe solutions is the use of hydrogen. The difficulty in using hydrogen does not lie in its production butrather in securing its transport by canalization and...

Applications of thin film technology have grown quickly, including thermal insulation, cuttingtools, solar cells, protection against oxidation and corrosion, and microelectronics. The use ofthermoelectric thin films, which have several advantages over bulky sensors (such as sensors of: heat flow,radiation, pressure, electric power, and thermocouple...

The objective of this study is to evaluate the potential applications of eco friendly-compositesbased on natural fibers. An analytical model has been developed in the present research to investigate themechanical behavior of sandwich pipes under internal pressure loading. The proposed model gives anaccurate solution for stresses, strains, and displ...

Although hydrogen is one of the most abundant gases in the universe and having a major energyand ecological interest, at present it has not been sufficiently exploited, despite that it can be used in severalsectors such as the production of electrical energy which is now the global challenge of the 21st century,or in the means of land, sea and air...

In this paper, analytical and 3D numerical models are developed to investigate the mechanical behavior of sandwich pipe under internal pressure loading. The suggested models provide an exact solution for stresses, strains and displacement on the sandwich pipe, which is made of epoxy material for the core layer and reinforced materials with an alter...

The application of lignocellulosic fibers as reinforcements in composite materials has found increasing use in recent years, due to the attractive characteristics of natural fibers such as their low cost, high specific modulus, biodegradability, abundance and with many technical qualities. Natural fiber hybrid composites are very frequently used in...

The application of lignocellulosic fibers as reinforcements in composite materials has found increasing use in recent years, due to the attractive characteristics of natural fibers such as their low cost, high specific modulus, biodegradable, abundant and with many technical qualities. Natural fiber hybrid composites are very frequently used in the...

After the olive harvest, part is devoted to the production of olive oil and the other to table olives (pitted and not pitted). This study focuses on the potential for recovery and recycling of certain agricultural waste, such as olive pits, i.e. the solid phase resulting from the pitting of olives. First, the olive pits are recovered, washed, dried...

For ecological reasons, the recovery of agricultural waste has become a global necessity. These enormous residues, biodegradable, can be used with different percentages as a reinforcing element in cementitious matrices in building materials. This study deals with the influence of the length and percentage of date palm trunk fibers (DPTF) incorporat...

The fibres extracted from vegetable plants are hydrophilic and rich in cellulose and can be considered as an excellent alternative to synthetic fibres, in particular glass fibres, and to be used as reinforcement in hydrophobic polymers they must generally be chemically treated with alkaline solutions to improve their fibre/matrix bond. However, alk...

Recently, there has been a rapid growth in research and innovation in the natural fiber composite area. Interest is warranted due to the advantages of these materials compared to synthetic fiber composites, including low environmental impact, renewable resources, low cost which attract wide range of applications. The use of lignocellulosic fibers f...

Titanium alloys are used in aeronautics and the shipbuilding industry for their good intrinsic properties, namely low density (40% less than steel), very good mechanical properties and resistance to corrosion. The purpose of this study is to optimize the cutting conditions during the turning of Ti-6Al-4V titanium alloy with Minimum of Quantity of L...

Because the certification of aircraft structures requires significant costs and time-consuming experimental tests, all the studies carried out are strong contributions to the applicability of repairs based on adhesively bonded fibre composite patches. In this context, the main goal of this study aims to analyse the effect of the impact position on...

Date palm fibers have been studied as potential reinforcement in composite materials. Their density is equal to 1.22 g.cm-3; making them suitable for use in lightweight applications. In order to efficiently use these fibers and understand their mechanical properties, quasi-static tensile tests and cyclic fiber fatigue tests were performed to determ...

Doi: 10.29327/566492. The application of lignocellulosic fibers as reinforcements in composite materials has found increasing use in recent years, due to the attractive characteristics of natural fibers such as their low cost, high specific modulus, biodegradable, abundant and with many technical qualities. Natural fiber hybrid composites are very...

Resumo Hoje no mundo observa-se uma corrida na busca por materiais oriundos de fontes renováveis. O uso de fibras vegetais reforçando polímeros, representa uma alternativa na substituição de fibras sintéticas em compósitos. O curauá é uma planta legitimamente brasileira, de fácil cultivo e processamento, que produz fibras de ótimo desempenho mecâni...

The present work reports an experimental study on the thermal and mechanical properties of hybrid composites obtained from Petiole Date Palm Fiber (PDPF)/Glass fiber (GF) as reinforcement and vinylester resin (VE). In order to improve the fiber/matrix adhesion, palm fibers were alkali treated with 5% NaOH solution for 24 h–72h. SEM and ATR-FTIR ana...

O livro “Inovações e tecnologias voltadas para as ciências exatas vol. 1”, editado e publicado pela Latin American Publicações Ltda., reúne três capítulos que tratam sobre temas de relevância no contexto das ciências sociais aplicadas. Assim, os trabalhos deste livro abordam sobre: a utilização de fibras nanoestruturadas de TiO2 como fotocatalisado...

The present paper introduces the impact of the turbulence model and the meshing effect on the airflow characteristics inside a square duct. The analysis in this study is done with the commercial software "ANSYS FLUENT 17.0" using the finite volume method. In this application, several numerical parameters such as the convective heat gain, the magnit...

Hoje no mundo observa-se uma corrida na busca por materiais oriundos de fontes renováveis. O uso de fibras vegetais reforçando polímeros, por exemplo, representa uma alternativa na substituição de fibras de vidro ou de carbono em compósitos. O curauá é uma planta legitimamente brasileira, de fácil cultivo e processamento, que produz fibras de ótimo...

Currently, for ecological and economic reasons, cellulosic fibres obtained from plants have enormous advantages for industrial applications. For example, the automotive sector suggests the use of composites reinforced with natural fibres due to their biodegradability, availability, low cost, and non-abrasive properties. However, due to the low resi...

Recently, there has been a rapid growth in research and innovation in the natural fiber composite area. Interest is warranted due to the advantages of these materials compared to synthetic fiber composites, including low environmental impact, low cost and wide range of applications. In this work, an evaluation of epoxy resin matrix composite reinfo...

The introduction of bio-composites in the manufacture of tubes by the filament winding technique poses a real challenge for design engineers. This study aims to evaluate the mechanical properties in circumferential traction and in circumferential compression of Jute-Epoxy tubes whose winding angle is considered to be variable. The experimental...

As fibras naturais hoje desempenham um papel importante como reforço em materiais compostos. O objetivo deste trabalho foi obter os parâmetros adequados para a fabricação de compósitos híbridos com fibras de curauá e partículas nanométricas de óxido de grafeno na matriz de Poliéster, buscando a variante ótima de maior resistência à tração e flexão....

Natural fibres have many advantages over synthetic ones, making them attractive for reinforcing polymer materials. This work evaluates the use of an Amazonian plant, namely Curauá (Ananas erectifolius), as a reinforcement phase of biocomposites fabricated by cold pressing. Curauá fibres have been shown to be a promising fibre for composite material...

As part of local agricultural date palm waste valorization, this work describes bio-composites made with a cement matrix reinforced with short Mesh date palm fibers for non-structural civil engineering applications. The study focuses in particular on investigating the influence of four parameters on the bending and compression properties of the bio...

O mercado automobilístico vem intensificando a criação e a aplicação de novas tecnologias veiculares. Nesse sentindo, entre os elementos que sofreram notável evolução, destacam-se as transmissões automotivas, que são objetos fundamentais na dinâmica veicular, pois contribuem para o deslocamento do automóvel e, além disso, são ofertadas no mercado n...

In the work is carried out a theoretical and experimental study of the applicability of two types of tool steels to obtain the best result in the hot forging of the motorcycle bottom table, which is a part of resistant steel. The two materials surveyed were SAE H13 tool steel and SSAB Toolox 44 steel. As a result of the work, it was found that Tool...

No trabalho foi feito um estudo teórico e experimental da aplicabilidade de dois tipos de aços ferramentas para obter o melhor resultado no forjamento a quente da mesa inferior da motocicleta que é uma peça de aço resistente. Os dois materiais pesquisados foram o aço ferramenta SAE H13 e o aço SSAB Toolox 44. Como resultado do trabalho foi constata...

Lignocellulosic fibers from date palm are one of the most available biomasses without significant valorization in the world. This work makes use of an experimental Taguchi design with three factors to determine the optimal conditions of three parameters related to date palm leaflets (gauge length, loading speed and fiber position). The paper also s...

The work describes the out-of-plane properties of a curved wall honeycomb structure evaluated using analytical models and finite elements techniques. Out-of-plane properties are calculated using a theoretical approach based on energy theorems and validated using a full-scale finite element technique to simulate transverse shear tests. The effects o...

This paper concerns an experimental approach to the stacking sequence influence on cross-ply laminates behaviour. Effects of fatigue on the residual strength and stiffness are investigated through performing post fatigue static test after specific numbers of cycles. Residual strengths were measured by testing specimens to a certain number of cycles...

In the present work, the quasi-static tensile tests of woven carbon/epoxy (CFRP) laminates used for aeronautic structures were carried out using a tensile testing machine with a high performance. These tests were performed according to different specimen standards ASTM D5766 and ASTM D3039. This study aims to focus on the effect of the cutting proc...

Cactus fibres have previously shown unusual mechanical properties in terms of bending and axial stiffness due to their hierarchical structural morphology. Bioinspiration from those cactus fibres could potentially generate architected materials with exciting properties. To that end we have built bioinspired artificial analogues of cactus fibres to e...

Nowadays, the world is facing a crisis in terms of renewable resources and a growing carbon footprint. For these reasons, the world is starting to use natural fibres as reinforcement in composite materials in various applications because of their many advantages, including their low cost, lightness and eco-friendly products, compared to synthetic o...

This investigation concerns the development of two prediction fatigue life models of cross-ply laminates, made up of glass fibre and epoxy resin, loaded under flexural control load. Both models are based on the description of the load’s evolution versus the cycle number during fatigue tests by several empirical functions of logarithmic, exponential...

Algeria is the largest country in Africa by in terms of land area, which makes it contain large quantities of agricultural residues. The aim of this study is the valorisation of the huge amount of agricultural residue of date palm rachis available in Algeria to be used as reinforcement in bio-composite materials for various industrial applications....

In these recent years, the advanced structural applications are interested highly by using of natural fibers as a reinforcement of polymer composites. The aim of this study was the valorization and evaluation the performance of petiole date palm fiber (PDPF) reinforced venylester resin composite. In the first part, an investigation on the morpholog...

This work aims to optimize the physico-chemical and tensile properties of vascular fibers extracted from a local date palm rachis in Algeria. This fiber has a very specific composition and architecture and is different from the remaining fibers obtained from the six possible parts of the tree. For this purpose, a Taguchi orthogonal array design L16...

Vegetable fibers have good mechanical properties, low density, no toxicity, are renewable and have low cost among other properties. The use of lignocellulosic fibers as reinforcement in polymeric composite materials in substitution of synthetic fibers is in the direction of sustainability. In the current investigation, an evaluation of biocomposite...

This work evaluates an epoxy composite reinforced with curauá fibres and/or organophilic clay. Epoxy polymers reinforced with nano-clays are also assessed. Composites are manufactured by cold pressing using fibres in pristine and treated conditions. Three levels of the factors NaOH solution (2.5, 5 and 10%) and immersion time (2, 4 and 10 hours) ar...

This work investigates a hybrid polyester composite consisted of Curauá natural fibres and organophilic clay nanoparticles. A Taguchi method is used to identify the effects of fibre fraction (10, 20 and 30 wt%), alkaline treatment concentration (NaOH, 2.5, 5 and 10 wt%), treatment time (2, 4 and 8 h) and nanoparticle content (2.5, 5 and 10 wt%) on...

This work describes the quasi-static tensile behavior and cyclic fatigue of technical fibers from date palm tested for the first time according to the authors' knowledge, which can be used in the reinforcement of green composites.The values of the stress and strain at failure and Young's modulus for18 samples tested under quasi-static tensile loadi...

This paper is focused on the identification of the in-plane elastic constants of a new design of auxetic (negative Poisson's ratio) honeycomb configuration with curved cell walls by using analytical and numerical homogenization techniques. The sensitivity of the elastic constants is determined against the various cell geometry parameters. Good agre...

Recently, there has been a rapid growth in research and innovation in the natural fiber composite area. Interest is warranted due to the advantages of these materials compared to synthetic fiber composites, including low environmental impact, low cost and wide range of applications. In this work, an evaluation of epoxy resin matrix composite reinfo...

Vegetable fibers have good mechanical properties, low density, no toxicity, are renewable and have low cost among other properties. The use of vegetable fibers as reinforcing agents in polymeric composite materials in substitution of synthetic fibers is in the direction of sustainability. In this work, an evaluation of epoxy resin matrix composite...

Due to the viscoelastic properties of cork and polymeric matrices, stress relaxation and creep behaviour of multiphase composites incorporating cork are important properties that should be considered at the design stage. For this purpose, composites with the same lay-up but with different fibres were manufactured with neat epoxy resin and epoxy res...

This study focuses on the chemical and thermo-physical characterization of date palm fiber, which can be used in the reinforcement of green composites. Alkaline solutions with different concentrations of NaOH (0.5, 1, 2 and 3%) and various immersion times (0.5, 1, 2, 4, 6 and 8h) at room temperature were used to treat fibers obtained from date palm...

Natural fibers today play an important role as reinforcement in composite materials. The objective of this work was to obtain the adequate parameters for the manufacture of hybrid composites with curauá fibers and graphene oxide nanometric particles in the Polyester matrix, looking for the optimal variant of greater resistance to traction and flexi...

Date palm rachis fibers are rich in cellulose, relatively inexpensive, and readily available in Algeria. The aim of this study is to investigate the morphology, structure, mechanical and physicochemical characteristics of both vascular bundles and fiber strands extracted from date palm rachis. The difficulties encountered are associated to the extr...

Natural fibers today play an important role as reinforcement in composite materials. The objective of this work was to obtain the adequate parameters for the manufacture of hybrid composites with curauá fibers and graphene oxide nanometric particles in the Polyester matrix, looking for the optimal variant of greater resistance to traction and flexi...

In this article, analytical and numerical models are proposed to describe the auxetic behavior of hexagonal honeycomb structures with curved walls. To do this, a comparative study between a conventional and auxetic honeycomb structure having respectively a positive and negative Poisson's ratio compared to hexagonal structure. The cellular structure...

The use of composite materials with lignocellulosic fibers (extracted from plants which is renewable resources) as reinforcing agents replacing synthetic ones goes towards sustainability as well as creating new sources of employment in the field where the lower income population lives. In this work an evaluation of epoxy resin composites and curauá...

Energy efficiency has quickly become one of the major issues of our time, and buildings are one of the leading component. They consume more energy than any other sector, and thus contribute to a large extent to climate change. The building sector is the largest consumer of energy as it represents between 30 and 40% of the global final consumption,...

Since the global warming potential and environmental toxicity are increasing in recent years, which has led the scientific and industrial communities to focus their interests on the use of materials of natural and ecological origin focusing their research topics on recyclable, renewable and sustainable materials with less impact on nature. It would...

In this study, we investigated the influence of the addition of sisal and glass fibres on the mechanical properties of polymer concrete (PC). These types of concrete are used in many modern civil engineering applications. The prismatic specimens sized according to ASTM C580-02 were elaborated with a PC constituted by 14% constant mass of polyester...

Um foco importante de modificação de argilas é a obtenção de argilas organofílicas para aplicação em nanocompósitos poliméricos. Argilas organofílicas são argilas que contém moléculas orgânicas intercaladas entre as camadas estruturais, onde a inserção de moléculas orgânicas faz com que ocorra expansão entre os planos d(001) da argila, e muda sua n...

Externally bonded reinforcement using Fiber Reinforced Polymer (FRP) is a good response to the concern represented by the need for rehabilitation of concrete structures. These techniques are more and more attractive because of their fast and low labour costs, very good strength to weight ratio, good fatigue properties, and non-corrosive characteris...

Nowadays, finding new approaches to attenuate the effects of the catastrophic shear failure mode for reinforced concrete beams is a major challenge. Generally the bending failure is ductile. It allows a redistribution of the stresses providing an early warning, whereas the rupture by shear is fragile and sudden which can lead to detrimental consequ...

L’épuisement des ressources fossiles puis la mise en œuvre du Grenelle de l’Environnement conduisent les industriels à s’engager dans une politique de Développement durable et favorisent l’émergence de l’utilisation des ressources renouvelables. Pour ces raisons et d’autres, le développement de matériaux de haute performance fabriqués à partir de r...

We propose in this paper analytical and numerical models that describe the in-plane uniaxial elastic properties (Young's moduli and Poisson's ratios) of a honeycomb structure with curved walls. We perform a parametric analysis of the mechanical performance of this honeycomb also by taking into account the different types of deformations acting insi...

We propose in this paper analytical and numerical models that describes the in-plane uniaxial elastic properties (Young's moduli and Poisson's ratios) of a honeycomb structure with curved walls. We perform a parametric analysis of the mechanical performance of this honeycomb also by taking into account the different types of deformations acting ins...

Honeycomb structures are essentially constituted of a repetition of regularly-arranged and loaded sub-structures. The present study carries out a parametrically investigation of the behavior of a multi re-entrant honeycomb structure with variable stiffness and Poisson’s ratio effects. A refined analytical model is specifically developed and compare...

This study focuses on the effect on the mechanical performance of concrete polymer beams subjected to 3-point bending that incorporate marble powder waste and quarry sand. This new conglomerate is evaluated for possible substitution of commercial-grade sand in the concrete. Two classes of polymer concrete beams, each with seven formulations, have b...

The work describes the statistical characterization of the tensile properties of raw and treated jute yarn fibers. The yarns are treated with various alkaline sodium hydroxide concentrations (0.5, 2 and 5%) and different immersion times at room temperature (30 minutes, 2, 8 and 12 hours). Due to the scattering of the experimental results, statistic...

Cette étude vise à évaluer les fibres naturelles végétales sauvages disponibles en Algérie dans laquelle on présente une nouvelle fibre qui provient de la tige du Jonc épars de nom scientifique Juncus effusus L. (JE). La morphologie et le diamètre des fibres techniques extraites de la tige de la plante de JE ont été caractérisées par microscopie op...

This study aims to assess the morphology and properties of fibers extracted from a wild natural plant largely available in Algeria known as Juncus effusus L. (JE). The morphology and diameter of the fiber bundles extracted from the stem of the JE plant were characterized by optical and scanning electron microscopy. The functional groups of the extr...