Zoheir Aboura

Zoheir Aboura
Université de Technologie de Compiègne | UTC · Département de Génie Mécanique

About

124
Publications
30,653
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1,589
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Introduction
Zoheir Aboura currently works at the Département de Génie Mécanique, Université de Technologie de Compiègne. Zoheir does research in Structural Engineering, Materials Engineering and Mechanical Engineering.

Publications

Publications (124)
Article
This paper proposes the use of a two-dimensional refined finite element model, based on the Carrera Unified Formulation (CUF), to predict the variation in capacitance of embedded piezoelectric sensors. The accurate stress field of laminated structures with embedded sensors has been evaluated by exploiting the capabilities of refined layer-wise mode...
Article
Full-text available
The present paper assessed the use of variable kinematic two-dimensional elements in the dynamic analysis of Lamb waves propagation in an isotropic plate with piezo-patches. The multi-field finite element model used in this work was based on the Carrera Unified Formulation which offers a versatile application enabling the model to apply the desired...
Conference Paper
Full-text available
Active health monitoring of structures throughout their life cycle is a privilege in the different industrial domains. However, it is essential to the domains where the structures are made of composite materials due to the complex damage mechanisms involved compared to metals [1] and due to the absence of an accurate numerical model that permits th...
Article
This study focuses on the thermal degradation behaviour of a newly developed fire retardant coated green biocomposite (GBC) and its kinetic analyses under inert and oxidative atmosphere. An intumescent fire retarding system comprised of ammonium polyphosphate-tris (2- hydroxyethyl) isocyanurate (APP-THEIC) and boric acid is used to improve fire ret...
Article
This article deals with an interlock woven composite and aims at providing a better understanding of the dissipative mechanisms activated under cyclic loadings and describing the damage scenario characteristic of heat build-up experiments. Since the ultimate objective of heat build-up experiment analyses is usually fatigue life predictions that are...
Article
Given it is usually highly problematic and time-consuming to evaluate the real in-situ damage and fatigue limit of the polymer-matrix composite (PMC) materials, this study investigates the electrical capacitance variation of polyvinylidene difluoride (PVDF) piezopolymer transducer embedded within PMC specimens made with a polyester resin reinforced...
Conference Paper
Full-text available
The use of in-situ piezo-electric sensors has been widely investigated to predict the complex composite structure failures, due to the absence of an analytical model suitable for that purpose. The embedded capacitance of these sensors is reduced compared to the free capacitance, which in turn has a positive impact for energy harvesting applications...
Article
Full-text available
The present work focuses on the characterization of the in-plane and out-of-plane behavior of a three-dimensional angle-interlock woven composite. In-plane tensile and compression tests, short beam shear tests and through-the-thickness compressive tests were carried out to assess the mechanical behavior of the composite material. The results are pr...
Conference Paper
Full-text available
Le présent travail se concentre sur la surveillance d'un matériau CMO en fibres de verre renforçant une matrice polyester, incorporant un capteur piézocéramique PZT de faible épaisseur, au cours des essais en flexion 4-points (monotone, charge/décharge et incrémentale jusqu’à la rupture) équipés d'une multi-instrumentation CND externe composée de l...
Article
Full-text available
Traditional laminated composites have fibres oriented only in the in-plane of the laminate due to their manufacturing process, and are therefore very susceptible to transverse cracking and delamination from out-of-plane actions. Delamination can considerably reduce the load bearing capacity of a structure hence several reinforcement solutions, base...
Conference Paper
The originality of this study lies in the real-time monitoring of the crosslinking steps of the polyester resin during the Liquid Resin Infusion (LRI) process of polymer-matrix composites (PMC) by a simple measurement of the electrical capacitance variation of a PZT (Lead Zirconate Titanate) transducer embedded into the heart of the fibrous stack....
Article
The originality of this paper is the study of the bending behavior of several carbon-fiber-reinforced thermoplastic sandwich composites under three-point bending tests using a mechanical-acoustic experimental coupling approach. The skins were fabricated from thermoplastic Polyphenylsulfone “PPSU” resin reinforced by 2x2 twill desized carbon fabrics...
Article
In this work, a description of carbon fiber reinforced polymers (CFRP) compression-damaging scenario from first micro-damages to final failure of the material and potential effect of matrix (resin) on compressive mechanical properties and the damaging scenario is given. For that, two types of CFRP with the same woven reinforcement but with differen...
Preprint
Full-text available
Traditional laminated composites have fibres oriented only in the in-plane of the laminate due to their manufacturing process, and are therefore very susceptible to transverse cracking and delamination from out-of-plane actions. Delamination can considerably reduce the load bearing capacity of a structure hence several reinforcement solutions, base...
Article
Full-text available
This article investigates the interest of a promising methodology, dealing with the use of an in-situ piezoelectric (PZT) disk to perform real-time Structural Health Monitoring (SHM) of glass fiber-reinforced polymer (GFRP) composites submitted to various four-points bending loadings: monotonic, load-unload and incremental load until failure. The r...
Article
Full-text available
This article investigates the interest of using in-situ piezoelectric (PZT and PVDF) disks to perform real-time Structural Health Monitoring (SHM) of glass fiber-reinforced polymer composites submitted to various tensile loadings. The goal is to evaluate the working range and SHM potential of such embedded transducers for relatively simple mechanic...
Article
In this work, electrical resistance change method is used for carbon fiber reinforced thermoplastic polymers damage monitoring. The electrical resistance variation could be an interesting complementary to existing/classical damage monitoring methods. It is extremely attributed to electrical conductivity of composite material and it appears that enh...
Article
This article investigates the interest of a novel promising approach, dealing with the use of an in-situ piezoelectric (PZT) disk to monitor the whole manufacturing process of a glass fiber/polyester Polymer-Matrix Composite (PMC) plate using the Liquid Resin Infusion (LRI) technique. The real-time in-situ Process Monitoring (PM) is conducted using...
Article
Full-text available
In this work, manufacturing tools for thermoplastic (TP) composites have been developed. The chosen process involves the stacking alternately of oriented dry fabrics and TP films and does not use semi-products in order to reduce material costs. This study was specifically directed towards optimizing the impregnation of continuous glass and carbon f...
Conference Paper
Full-text available
This article investigates the Structural Health Monitoring (SHM) potential of a piezoceramic (PZT) disk embedded into a Polymer-Matrix Composite (PMC) material submitted to a cyclic loading test. To do so, several samples were extracted from a PMC (glass fiber/polyester resin) plate manufactured using the Liquid Resin Infusion (LRI) technique, each...
Article
This study focuses on the experimental identification of the first damage envelope in a 3D woven composite with polymer matrix, under multi-axial loadings including combined in-plane tension and out-of-plane shear loadings (σ-τ envelopes). Proportional Tensile-Torsion tests on rectangular bars were performed to induce different multi-axial stress s...
Article
Full-text available
This article aims to provide a general overview on what has been achieved recently in the scientific community on the manufacturing, embedding, and wiring techniques of various kinds of piezoelectric devices for manufacturing monitoring and structural health monitoring applications of polymer–matrix composites.
Conference Paper
Full-text available
This article investigates the Liquid Resin Infusion (LRI) manufacturing of glass fiber/polyester composite plates embedding a thin piezoelectric (PZT) disk. The real-time in-situ Process Monitoring (PM) of this technique is performed using the electrical capacitance signature of the embedded PZT transducer. To help with the understanding of capacit...
Conference Paper
Full-text available
L'étude se focalise sur la réponse électrique des composites à matrice organique (CMO) fabriqués avec une résine thermoplastique PPSU (polyphénylsulfone) renforcée par des tissus en carbone sergé 2/2 lors des essais d'auto-échauffement. La stabilisation des mesures thermique (température) et électrique (résistance), conduites simultanément, a été c...
Poster
Full-text available
Utilisation du signal électrique (capacité) d'un transducteur piézoélectrique (PZT) in-situ utilisé en mode passif afin de surveiller en temps réel la fabrication d'une plaque composite verre/polyester par infusion. Sensibilité du PZT à divers stades de l'injection (saturation préforme, fermeture des robinets) ainsi qu'aux transitions d'états de la...
Conference Paper
Full-text available
Cet article étudie la surveillance du procédé d'infusion d'une plaque composite fibre de verre/matrice polyester grâce à l'intégration d'un disque piézoélectrique (PZT) fin. La surveillance du procédé (PM) est réalisée par un suivi en temps réel de la variation de capacité électrique du PZT in-situ. Pour avoir une meilleure compréhension de cette v...
Article
The study investigates the electrical resistance response of polymer-matrix composites (PMC) with thermoplastic PPSU (polyphenylsulfone) resin reinforced by twill 2/2 carbon fabrics during tensile and self-heating tests. During the tensile tests, the electrical resistance increases at the beginning of the tests, but drops due to the fibers/matrix d...
Article
This article aims to provide a general overview of what has been achieved recently in the scientific community on the manufacturing monitoring and structural health monitoring of polymer-matrix composites (PMC) using in-situ piezoelectric sensors. Some industrial applications with the underlying issues and potential solutions will finally be discus...
Conference Paper
Full-text available
This paper relates the experimental study of the in plane and through thickness shear behavior of a 3Dwoven SiC/SiBC Ceramic Matrix Composite (CMC). Torsion tests were applied on rectangular bars to identify both initial in plane and through thickness shear modulus of the material. By the means of a mutli-instrumented approach, composed by tridimen...
Article
This paper aims the investigation of the damage monitoring by the piezoresistive effect of the tufting threads in the sandwich structures. This novelty is an additional advantage besides the primary interest for inserting tufts in composite structures that concerns the improvement in the interlaminar fracture toughness. Tufting process reinforced t...
Article
The present paper investigates the damage monitoring using the piezoresistive effect on the glass fiber-reinforced polymer (GFRP) omega stringers reinforced through-the-thickness by tufting. The experiments consisted of the electric resistance measurements from the tufted yarns during the pull-off tests on omega stringers. Acoustic emission (AE) an...
Article
Full-text available
Through-the-thickness reinforcement (TTR) techniques have been increasingly applied to fiber-reinforced polymer composite laminates to reduce the issues caused by the weak out-of-plane properties which can reduce significantly their load-bearing capacity. The present work investigates the electrical response of carbon tuft threads as reinforcements...
Conference Paper
Full-text available
Through-the-thickness reinforcement (TTR) techniques have been increasingly applied to fiber-reinforced polymer composite laminates to reduce the issues caused by the weak out-of-plane properties which can reduce their load-bearing capacity significantly. The present work investigates the electrical response of carbon tuft threads as reinforcements...
Article
Stitched sandwich becomes popular in structural application owing to its better performance in the transverse direction with respect to classical sandwich structure and relatively low-cost additional stitching process. The identification of its elastic properties is essential for offering a tailored structure for specific applications. A non-destru...
Article
Stitched sandwich becomes popular in structural application owing to its better performance in the transverse direction with respect to classical sandwich structure and relatively low-cost additional stitching process. The identification of its elastic properties is essential for offering a tailored structure for specific applications. A non-destru...
Poster
Full-text available
In composite materials industry, manufacturing process parameters are quite difficult to evaluate, especially in real-time. Nevertheless data about mold filling, matrix curing or temperature gradients can be very helpful to improve a manufacturing process in order to obtain parts with better mechanical properties, or to know if a manufactured part...
Conference Paper
The microstructure of composites is often complex and exhibits local defects such as void areas and interfacial debonding. Thus, it is difficult to predict their mechanical behavior using classical continuous methods. The Discrete Element Method (DEM) is a good alternative because it naturally takes into account discontinuities. However, in DEM sim...
Conference Paper
Full-text available
Polymer composite laminates have shown great mechanical properties throughout the years and have been applied especially to aerospace, automotive, naval and civil industry. Despite their excellent in-plane properties such as high stiffness/toughness to weight ratio, out-of-plane properties have been one of the most important issues. The fracture to...
Article
The effect of trough-the-thickness reinforcement by tufting on impact and after impact behavior of woven carbon fiber composites is investigated. The density and angle of the carbon fiber threads during tufting process were varied to achieve better results on damage tolerance. The samples were submitted to out-of-plane impact with two different ene...
Article
This work tends to characterize the effect of carbon black nanofillers on the properties of the woven carbon fiber reinforced thermoplastic polymers. First of all, composites from nanofilled Polyamide 6 resin reinforced by carbon fibers were fabricated. Scanning electron microscopy observations were performed to localize the nanoparticles and showe...
Chapter
This chapter discusses mechanical behavior and damage mechanisms of a 3D woven interlock SiC/SiC composites subjected to uniaxial tension through an experiment. Digital Image Correlation, Acoustic Emission and microscopic observations were simultaneously used to characterize mechanical behavior and monitor progressive damage. These adequate experim...
Article
T-joints stiffeners made from carbon/epoxy composites have been increasingly applied in aeronautical structures, however as majority of the carbon fiber reinforced structures, they have faced with delamination problems. Through-the-thickness reinforcements for laminate composites have been studied as manner to increase transversal strength, especia...
Article
The aim of this study is to purpose a robust experimental method to measure both in-plane and out-of-plane shear moduli of a 3D woven Ceramic Matrix Composites (CMC) SiC-SiBC, using torsion tests on rectangular bars. To construct this methodology, several data reduction process have been discussed. Then, the edge effects and their consequences on t...
Article
The identification of elastic properties from the dynamic behavior of structure has long been an alternative method to mechanical test. This method can avoid the variability of properties due to extraction of the specimen and achieve better homogenization by involving the whole structure. The mode classification is proposed and integrated in the id...
Patent
L’invention concerne un procédé (100) de fabrication d’une pièce en matériau composite renforcé comprenant des étapes de : - (110) former un empilement (1) comprenant une pluralité de premières couches (11-18) et une pluralité de deuxièmes couches (21-29) disposées en alternance avec les premières couches (11-18) dans l’empilement, dans lequel chaq...
Article
Full-text available
This paper describes the design and implementation of a new innovative machine for hydraulic crash of composite materials. Polymer-matrix composite (PMC) plates with polyamide 11 (PA11) matrix/woven glass fibers were impacted with the new machine at 10 bars during 5 ms and their dynamic response, in terms of crash pressure and deflection at the pol...
Conference Paper
Full-text available
Composite beams reinforced with braided fabrics exhibit good mechanical properties and are used for different applications as basic structural element. This work presents an investigation about the numerical determination of the mechanical behavior of braided architectures using geometrical modelling and subsequent voxel-FE homogenization of the st...
Article
Full-text available
This paper describes the design and implementation of a new innovative machine for hydraulic crash of composite structures at a laboratory scale. This machine can be classified in the category of low velocity impact machines. Its first use was conducted on a glass fiber-reinforced polymer composite plate (GFRP), impacted by a fluid (water) at 10 ba...
Article
The authors wish to make the following correction in the omission of two authors that contributed to this article. The complete list of authors is: Walid Harizi, Sami Kaidi, Aurélie Monnin, Nemr ElHajj, Zoheir Aboura, and Malk Benzeggagh.
Article
This paper describes the design and implementation of a new innovative machine for the hydraulic crash of composite structures at a laboratory scale. This machine can be classified in the category of low-velocity impact machines. Its first use was conducted on a glass fiber-reinforced polymer composite plate (GFRP), impacted by a fluid (water) at 1...
Article
Improvement of the interfacial toughness of composite sandwich by stitching process is studied in this paper. Double cantilever beam tests are performed to quantify the influence of the presence of the through-the-thickness reinforcement on the skin–core interfacial toughness. The compliance method is used to determine the energy release rate but w...
Article
A procedure for the determination of homogenized elastic moduli from a voxel-FE description of the material architecture is presented. The voxel-FE approach enables the automated and robust generation of Representative Elementary Volumes for a wide range of heterogeneous materials, in particular woven composites. Thanks to the regularity of boundar...
Article
Full-text available
This paper presents the Onera damage model adapted to predict damage and failure mechanisms encountered in a new generation of interlock woven composite with ceramic matrix. The predictions of the present approach are compared successfully with different multi-instrumented tests performed at Onera or UTC in terms of non-linear behaviour, damage evo...
Article
Full-text available
This paper relates the experimental study of the in plane and through thickness shear behavior of a 3D woven SiC/SiBC Ceramic Matrix Composite (CMC). Torsion tests were applied on rectangular bars to identify both initial in plane and through thickness shear modulus of the material. By the means of a mutli-instrumented approach, composed by tridime...
Article
Carbon/epoxy stiffeners to skin T joints by one side stitching (OSS), injected by Resin Transfer Molding (RTM) process have been performed. The macroscopic performances of the resulting stitched structure have been then compared with unstitched one, using pull-off tests. To complete this study, stitching effects have been analyzed thanks to a multi...
Article
This work is part of a global experimental approach aiming at studying the damage and rupture of 3D carbon/epoxy composites and based on multiinstrumented experiments. It focuses on the use of digital image correlation (DIC) in order to detect the development of local non-linearities corresponding to damage (with no other non-linearities) and is li...
Article
This article provides an improvement of the technology of through-the-thickness reinforcement of thermosetting composite sandwiches by the insertion of stitching yarns.The aim of this work is to propose a model that would lead to the representation of the tri-dimensional elastic and ultimate performances of these 3D structures under out-of-plane sh...
Article
Nowadays, the request to use materials preserving the environment is in strong growth. The good mechanical properties, honeycomb structure and low density of flax-shaves allow them to be used as aggregate in polymeric matrix composite. The innovation of this work consists in introducing a simple manufacturing process of agro-composites based on fla...
Article
Due to their material heterogeneity, the experimental study of 3D composites requires the use of specific strain measurements, like DIC. Moreover, when dealing with fatigue tests, the strain level remains very low, the derivation of strain field from the displacement field becoming a difficult task. In this paper, we propose a filtering tool based...
Article
By a judicious exploitation of the elastic theory of anisotropic body (Lekhnitskii [1] ), scientific community has developed methods and identified some precaution to take during the establishment of rectangular bar torsion tests. This kind of test allows simultaneous access to in plane (G12) and out of plane (G13 or G23) shear moduli. To enable th...
Article
Acoustic emission is a nondestructive controlling method which has proven its use in damage tracking of composite materials. In this paper, this technique is applied on glass/polyester composite. We focus on mechanical behavior of these materials under fatigue loading. The results of such test allowed us not only, to plot the Wöhler's curve but to...
Article
This study concerns the finite element modeling of mechanical behavior of 3D composites. It offers two Strategies at two scales. The originality of the first approach lies in its ability to model any representative elementary volume simply and robustly. It is based on voxelization techniques. The second approach, more pragmatic, discusses the model...
Article
Full-text available
The current paper summarizes studies undertaken on the corrugated cardboard. In these studies, a new approach considering the corrugated cardboard as an orthotropic material is developed. This approach permits after homogenization to simplify the numerical calculations and then use a 2D meshing of the corrugated cardboard, instead of a 3D meshing....