Dissertations / Theses on the topic 'Composites à fibres – Endommagement, Mécanique de l' (milieux continus) – Modèles mathématiques'
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Consult the top 33 dissertations / theses for your research on the topic 'Composites à fibres – Endommagement, Mécanique de l' (milieux continus) – Modèles mathématiques.'
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Touchard, Fabienne. "Spécificités du comportement mécanique de composites stratifiés à fibres longues et à matrice thermoplastique." Poitiers, 1994. http://www.theses.fr/1994POIT2338.
Full textZitoune, Redouane. "Analyse des conditions d'usinage lors du perçage de structures composites fibres longues en carbone-époxy." Toulouse 3, 2004. http://www.theses.fr/2004TOU30182.
Full textThe drilling of composite structures long fibres in carbon/epoxy is accompanied by damages which are indexed according to their place of appearance. We distinguish three zones: at the entry of the hole - which corresponds to the separation of the top ply of the laminate, at the wall of the hole - with wrenching of fibres and the resin degradation, and at the exit of the hole - with the separation of the last ply. The zones of the wall and hole exit are the place of the major defects which harm the lifetime of bolted or riveted assemblies. Within the framework of this work we are interested in the analysis of the wall and exit hole defects. To analysis the wall defect, a simplified study is proposed. It consists in a numerical and experimental study of the orthogonal cutting of unidirectional laminates. The angle (q) between the fibres and the cutting speed direction (Vc) is respectively 0ʿ, +45ʿ, 90ʿ and -45ʿ. For the analysis of the defect at the hole exit, an experimental and numerical study on two types of materials in carbon/epoxy long fibres is carried out
Meraghni, Fodil. "Identification expérimentale des mécanismes d'endommagement contribuant à la modélisation micromécanique du comportement élastique-endommageable des composites à fibres discontinues orientées aléatoirement (C. F. D. O. A)." Compiègne, 1994. http://www.theses.fr/1994COMPD697.
Full textLai, Dawei. "Contribution à la modélisation de la rupture des plaques stratifiées entaillées sous un chargement monotone ou cyclique comprenant une sollicitation de compression." Compiègne, 1988. http://www.theses.fr/1988COMPD150.
Full textEste, Alexia. "Modélisation de l’endommagement d’un composite 3D carbone/carbone : comportement à température ambiante." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0006/document.
Full text3D C/C composites are commonly employed in aerospace industry due to their outstandingmechanical properties at high temperatures. In order to ensure the integrity of structures,knowledge of the composite mechanical behaviour and fracture mechanisms is crucial.For this purpose, damage modeling of a 3D C/C composite, at room temperature, isproposed in which a meso-scale approach is considered. At this description scale, 3D C/Ccomposites are made of two materials : carbon fibers yarns and carbon matrix. Each materialbehavior is modeled by an elastic damage law (isotropic for matrix, orthotropic for yarns)with a limited number of parameters.The parameters identification process is based on experimentaldata obtained from previous work and from an experimental campaign carried outthrough this thesis work. This campaign aimed to a greater understanding of the materialmechanical behavior at mesoscopic scale. Furthermore, experimental tests were carried outto validate the composite modeling. It is shown that experimental reponses obtained fromfour-point and three-point bending tests are particularly well described from the proposedmesoscopic model
Vasiukov, Dmytro. "Damage modeling of fibre reinforced polymer composite materials under cyclic loadings by a simplified approach." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10043.
Full textA numerical framework for the modeling of the damage in fibre reinforced polymer composite materials has been developped. The objectives were to provide efficient numerical tools to predict the damage under static and cyclic loading. Two different models were proposed, one based on a fully computational multi-scale homogenization technique and a second one under the hypothesis of the meso-mechanics associated with a coupled damage-plastic constitutive model. The latter has been used in a new approach developped to predict the life of composite structures. As a first approach, a multi-scale application has been developed to better understand the influence of the damages occuring at lower scales on the macroscopic response. The macroscopic is defined by homogenization of a unit cell. The scheme is used to analyze the effect of the matrix damage on the material response in the case of unidirectional composites. To overcome the difficulties of the multi-scale approach, a meso-scale phenomenological model based on the coupled plasticity with continuous damage mechanics is proposed. All comparisons of the simulation with experiments and other models have shown good agreements. The third contribution is the development of a new approach to predict the life of composite materials based on the assumption that the material reaches a damage stabilized state during his life. This assumption makes it possible to use the simplified analysis. The life of the material is considered depending on the level of the thermodynamical forces associated with damage at the stabilized state by the use of a power law. Good agreements are obtained with experimental results
Maziz, Ammar. "Analyse des endommagements dans les pipes en matériaux composites." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2021. http://www.theses.fr/2021ENTA0019.
Full textDamage modelling of hybrid composite materials has played an important role in the design of composite structures. Although numerical models for the progressive damage of filament wound hybrid composite pipes such, matrix cracking, delamination, and fiber failure have been developed in the literature; there is still a need for improvement. This thesis aims to develop damage models suitable for predicting dynamic behaviour and intra-laminar and inter-laminar damage in hybrid composite tubes under internal pressure subjected to dynamic loading such as the impact of an external object. Fracture mechanics and continuum damage mechanics approaches were adopted to build the damage model. A detailed analysis was performed to have an overview of all the damage mechanisms until the final failure. Cohesive elements were inserted into the two-dimensional and three-dimensional models to simulate the initiation and propagation of matrix cracking and delamination in cross-layered laminates. The damage model was implemented in the FE code (Abaqus/Explicit) by a user-defined material subroutine (VUMAT). Subsequently, validations based on test/calculation correlations on real subsystems and/or parts were performed. Damage initiation was predicted based on the stress-strain failure criteria, while the damage evolution law was based on the dissipation of failure energy. The nonlinear behavior of the material in shear was also taken into account and validated against experimental/numerical results. The predictions show excellent agreement with the experimental observations
Lévêque, David. "Analyse de la tenue au délaminage des composites stratifiés : identification d'un modèle d'interface interlaminaire." Cachan, École normale supérieure, 1998. http://www.theses.fr/1998DENS0002.
Full textPatamaprohm, Baramee. "Conception et durabilité de réservoirs en composites destinés au stockage de l’hydrogène." Thesis, Paris, ENMP, 2014. http://www.theses.fr/2014ENMP0021/document.
Full textPresently, the compressed hydrogen storage under high pressure appears to be the most sophisticated solution regarding to a compromise of mass, service pressure and also volume of pressure vessels. However, the challenges of pressure vessels nowadays are their performance improvement as well as their cost reduction. In this context, we studied the type IV hydrogen storage pressure vessel in carbon fibre/epoxy composites. This work aims to obtain a reliable pressure vessel design. Firstly, an experimental study of associated materials and pressure vessel characterisation has been carried out. Then, we proposed a probabilistic model for a composite which is dedicated in particular to fibre breakage using multi-scale simulations in accordance with its mechanical and physical properties. Once this model joined with damage criteria dedicated separately to the others damage mechanisms are integrated into the pressure vessel simulations. Finally, recommendations on composite pressure vessels have been proposed in order to improve their performances and to decrease the mass of composite directly corresponding to the reduction of composite pressure vessels cost
Gillard, Adrien. "Caractérisation et modélisation du comportement thermomécanique d'un composite 3D carbone/carbone : étude du comportement aux interfaces à haute température." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0021/document.
Full textC/C composites are used as shield for aerospace applications since they display beneficial thermo-mechanical properties at high temperature, as well as high resistance to ablation. Though the macro-scale behavior was thoroughly studied in the past, no model can efficiently tie the properties of the constituents at the meso-scale to the effective macroscopic behavior. In addition, the phenomenological models proposed so far cannot predict a change in the composition. Besides, the interfaces influence on the out-of-axis mechanical behavior of the composite is yet to be evaluated. Thus, the goal of this work is to build a multi-scale model for the thermo-mechanical behavior of a 3D C/C, with a particular focus on the interfacial properties and its evolution with temperature. This study is based on the morphological and thermo-mechanical characterization of the material and its constituents. An original push-out test device has been developed to conduct high-temperature interfacial characterization at two scales (yarn/yarn and fiber/matrix interfaces). Collected experimental data were used for modeling purposes at the meso-scale. A cohesive zone model has been developed to take into account the specific behavior of the interfaces. Finite element simulations were successfully performed to reproduce the non-linear behavior of the material including the effective properties evolution with temperature. This model allowed to effectively link the damage mechanisms observed atthe lower scale to the 3D C/C macro-scale behavior
Benzarti, Karim. "Micro- et méso-structures de composites unidirectionnels verre-époxyde à interfaces modèles : modélisation du comportement viscoélastique linéaire et mécanismes d'endommagement." Lyon 1, 1997. http://www.theses.fr/1997LYO10176.
Full textAndo, Kohei. "Modélisation théorique de l'endommagement des matériaux composites et application de l'effet de l'endommagement à la rupture et à l'optimisation." Compiègne, 1987. http://www.theses.fr/1987COMPD072.
Full textAbdullah, Elie. "Développement d'un élément fini pour la modélisation du délaminage dans les structures composites." Toulouse, ENSAE, 2005. http://www.theses.fr/2005ESAE0033.
Full textRivallant, Samuel. "Modélisation à l'impact de pales d'hélicoptères." Toulouse, ENSAE, 2003. http://www.theses.fr/2003ESAE0018.
Full textPotet, Pierre. "Contribution de la vibrothermographie à la détection et à la caractérisation de l'endommagement dans les matériaux composites." Compiègne, 1988. http://www.theses.fr/1988COMPD110.
Full textA modelisation of the heat transfer phenomenas occurring during vibrothermographic experiments was carried out. The theoretical model can be used in the case of a thin orthotropic plate. It permits the determination of the heat source field from a measured temperature field. The experimental study was made with impacted damaged specimens. The results obtained from vibrothermographic experiments were compared with those obtained from standard NDT tests, such as ultrasonics, radiography and tomodensitometry. The results clearly show the high potential of this technique for the detection and characterisation of damage in composite materials
Benmedakhene, Salim. "Étude phénoménologique du comportement à l'impact des matériaux composites." Compiègne, 1996. http://www.theses.fr/1996COMPD918.
Full textZaïri, Fahmi. "Contribution à l'étude de la déformation et de l'endommagement des polymères vitreux homogènes et à renforts caoutchoutiques." Lille 1, 2004. http://www.theses.fr/2004LIL10127.
Full textBai, Ruqing. "Numerical modeling of isotropic and composites structures using a shell-based peridynamic method." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2482.
Full textThis thesis introduces some new complements and improvments for the Bond-Based Peridynamics theory concerning the numerical modeling of thin structures such as beams and plates, isotropic and multilayer composites subjected to dynamic loading. Our developments have been focused mainly on exploring the possibilities offered by the Peridynamic method, which has been widely applied in various engineering domains where strong or weak discontinuities may occur such as cracks or heterogeneous media. The generalization procedure of the Peridynamics method for the modeling of Timoshenko beam structures and Reissner-Mindlin plate structures respectively with a wide range of thickness to length ratio starting from thick structures to very thin structures is given. And A simplified low velocity impact based on the developed Peridynamic model for Timoshenko beam and ReissnerMindlin plate has been proposed by using a specific contact procedure for the estimation of the impact load. The originality of the present method was the introduction for the first time of two techniques for the alleviation of the shear locking problem which arises in thin beam and plate structures, namely the reduced (or selective) integration method and mixed formulation. The resulting Peridynamic model for Timoshenko beam structures and Reissner-Mindlin plate structures is efficient and does not suffer from any shear locking phenomenon. Besides, the generalization procedure of Peridynamic method for the modeling of fiber-reinforced thin composite structures is introduced. The Peridynamic approach for the modeling of a lamina is firstly validated in the quasi-statics including a crack propagation prediction problems subjected to mechanical loading conditions and then the Peridynamic method was further extended to analyze fiber-reinforced thin composite structures using the fundamental lamina theory. Finally, several applications involving fiber-reinforced thin composite structures and numerical results were validated by comparison to the FEM solution obtained using commercial software or to reference solutions from the literature. In all applications, the Peridynamics shows that results are matching perfectly the reference solutions, which proves its efficiency potentiality especially for crack paths simulation in isotropic and composite structures
Scida, Daniel. "Étude et modélisation du comportement mécanique de matériaux composites à renforts tisses hybrides et non hybrides." Compiègne, 1998. http://www.theses.fr/1998COMP1168.
Full textGruescu, Ion Cosmin. "Approche par changement d'échelle de l'endommagement des matériaux anisotropes : application aux composites à matrice fragile." Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-229-230.pdf.
Full textDans le cadre des techniques d'homogénéisation basées sur l'utilisation des tenseurs d'Eshelby, on propose ensuite une approche tridimensionnelle des milieux orthotropes contenant des fissures ouvertes modélisées par des cylindres infinis. Les résultats obtenus (tenseur d'Eshelby, tenseur de Hill) sont entièrement nouveaux, notamment dans le cas de fissures arbitrairement orientées par rapport aux axes d'orthotropie. Ils mettent clairement en évidence l'interaction entre l'orientation de la microfissuration et l'orthotropie initiale du matériau. Le dernier volet de l'étude est dédié à la modélisation tridimensionnelle de l'endommagement dans les composites à symétrie orthotrope de révolution, affaiblis par des fissures de forme circulaire ("penny-shaped cracks"). En raison de la difficulté particulière à aborder ce problème 3D dans le cadre des méthodes d'homogénéisation, on propose une approche mixte originale combinant les théorèmes de représentation et des résultats issus de la micromécanique. Les bonnes capacités prédictives du modèle macroscopique d'endommagement ainsi élaboré, de même que les comparaisons avec des données expérimentales, permettent de valider la démarche développée
Nehme, Samer. "Contribution à l'approche numérique multi-échelles pour la modélisation du comportement mécanique de matériaux composites à renfort interlock." Compiègne, 2011. http://www.theses.fr/2011COMP1952.
Full text2. 5D interlocks are particular reinforcements of aeronautic composite materials that are believed to have a high structural potential. This kind of reinforcement entails to consider the composite as a structure because interlocks are built by crossing the warp tows with the weft tows in the three directions. To evaluate the mechanical behavior, one may obtain numerically the anisotropic elastic engineering constant from a finite elements model. This technique of virtual testing consists to model the composite at it’s the meso-scale to obtain a macro-scale response with a stress-displacement analysis. We thus propose a new meshing methodology to build an elementary volume made of tetrahedral for the isotropic matrix and of mapped hexahedral for the transversely isotropic yarns. In order to achieve the finite element discretization, a geometrical model is developed from measurements taken from photomicrographs of an interlock composite. The industrial sofware package « Ansys Academic Associate » is used to solve the problem with contact element, local orientation of the anisotropy in yarns and computation of nine macroscopic orthotropic engineering constants. The numerical results are compared to experimental data and an analytical model. The finite element model shows a good agreement with our previous work. Beyond satisfying results for the elastic behaviour, the delamination is correctly described using a cohesive approach focusing on the concepts of linear elastic fracture stresses, associated with Mode I and mode II
Belayachi, Naïma. "Analyse du comportement des polymères chocs avec la prise en compte de l'endommagement par cavitation." Lille 1, 2006. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/a8de7da2-1bb0-4eac-b442-26c071600c07.
Full textBouchart, Vanessa. "Étude expérimentale et modélisation micromécanique du comportement et de l'endommagement des élastomères renforcés." Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-Bouchart.pdf.
Full textRukavina, Tea. "Multi-scale damage model of fiber-reinforced concrete with parameter identification." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2460/document.
Full textIn this thesis, several approaches for modeling fiber-reinforced composites are proposed. The material under consideration is fiber-reinforced concrete, which is composed of a few constituents: concrete, short steel fibers, and the interface between them. The behavior of concrete is described by a damage model with localized failure, fibers are taken to be linear elastic, and the behavior of the interface is modeled with a bond-slip pull-out law. A multi-scale approach for coupling all the constituents is proposed, where the macro-scale computation is carried out using the operator-split solution procedure. This partitioned approach divides the computation in two phases, global and local, where different failure mechanisms are treated separately, which is in accordance with the experimentally observed composite behavior. An inverse model for fiber-reinforced concrete is presented, where the stochastic caracterization of the fibers is known from their distribution inside the domain. Parameter identification is performed by minimizing the error between the computed and measured values. The proposed models are validated through numerical examples
Pineau, Pierre. "Essais virtuels et modèle statistique de multifissuration transverse des fils dans les composites tissés à matrice céramique." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14208/document.
Full textThis work deals with the study and modeling of multiple crakcing of tows in wovenCMCs. Its understanding is fundamental to determine the effect on stress fields, the evolutionof damage and the lifetime of material.From observations on real CMC pieces, virtual materials are developed and multiplecracking virtual testing is achieved. Different scenarii are simulated on various CMC microstructures.These simulations are a substitute for impossible experimental observations.A statistical model for multiple cracking based on the weakest link principle applied to adistribution of Poisson is developed. Micostructural singularities are represented by defectsin a homogeneous medium equivalent (EHM). Modifications of distribution functions duringthe multicracking are modeled.The statistical model realizes a scale changing : transverse multicracking is simulated inthe EHM with a reduction of almost 90% for computational time
Dubé, Jean-François. "Modélisation simplifiée et comportement visco-endomageable des structures en béton : applications aux séismes et aux choc des ouvrages en béton armé." Cachan, Ecole normale supérieure, 1994. http://www.theses.fr/1994DENS0021.
Full textSeisson, Gabriel. "Etude expérimentale et théorique de l'endommagement du graphite sous sollicitation dynamique - Application aux impacts hypervéloces." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2014. http://www.theses.fr/2014ESMA0015/document.
Full textComposite materials are widely used in various applications and may be submittedto hypervelocity impacts (HVI), such as in the aerospace field. The size of the impactors beingclose to that of a strand of fibers, mesoscopic simulations are of great interest but they need reliablenumerical models for each meso-Constituent. Graphite often being used as fiber or matrix,we studied its dynamic behavior. Penetration and craterization experiments have been conductedonto porous isotropic graphite. Post-Mortem analysis of targets, associated to order-Of-Magnitudecalculations, sheds a new light on the phenomenology of impacts and brings useful informationfor numerical simulation. A model for porous and brittle materials, implemented into a hydrocode,is used. Partially based on static mechanical properties, it has been progressively tested on planeshocks. Its use for simulating HVI gives satisfying results. Nevertheless, it was necessary to validateit by disregarding the projectile behavior. In that purpose, a campaign of laser-Driven shocks hasbeen conducted. In-Situ diagnostics have been simultaneously used and their correlation with postmortemanalysis allowed the identification of different damaging regimes of the targets. Finally,although the equivalence between HVI and laser-Driven shocks is not proved, the latter turned outto be complementary, suggesting the future evolutions of the numerical model
Benelfellah, Abdelkibir. "Contribution à la modélisation de l'anisotropie induite par endommagement d'un matériau agrégataire énergétique." Thesis, Tours, 2013. http://www.theses.fr/2013TOUR4018/document.
Full textAn explosive aggregate material exhibits a visco-elastic behaviour with damage, internal friction and sensitivity to the confining pressure and temperature. This thesis focuses on the anisotropic elastic damage with unilateral effect. The first aim of this study is to highlight experimentally the anisotropic nature of the damage. Then, a new model is proposed for the studied material. This is achieved using a comparison of some relevant models in order to select the most appropriate among them. The selected model is then improved by adding unilateral effect mechanisms and plasticity. Experimental data is used to characterize the material behaviour and to determine the parameters of improved model. This model has been implemented in the finite element software (Abaqus / Standard) using Fortran procedure (UMAT) and then tested for different loads and compared with experimental results
Destouesse, Villa Jaime. "Caractérisation et modélisation des joints de colles sous sollicitations bi-axiales statiques." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2018. http://www.theses.fr/2018ENTA0008/document.
Full textToday, structural bonding presents an interesting alternative to conventional methods of assembly, in order to reduce the weight within aeronautical structures. However, the use of this method raises many questions in terms of design, characterization or modeling. This work presents a robust experimental work, aiming two main objectives: (i) select the most suitable instrumentation for the characterization of the behavior of bonded joints up to failure and (ii) predict the behavior of bonded joints from complete characterization and modeling under quasi-static bi-axial loading, using a simple test, directly integrated to industry. In a first stage, to achieve this goal, modified Scarf test has been proposed to characterize the mechanical behavior of adhesive joints. This type of specimen allows applying multiaxial loadings without having high-stress concentrations near the edges. The second part of the thesis deals with the development of a strategy for simplifying the characterization of a bonded joint using some hypotheses (stress/strain states). This strategy allows obtaining the intrinsic behavior of the adhesive in the form of the stress/strain curves. The last part of this work deals with the identification and selection of the most appropriate instrumentation systems in the experimental characterization
Perrot, Grégory. "Modélisation du comportement des composites à matrice céramique auto-cicatrisante sous charge et atmosphère oxydante." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0442/document.
Full textSelf-Healing Ceramics Matrix Composites (HT-CMC) are developed since several years for theirapplication in aeronautic applications and are interesting for their good resistance to criticalenvironments. As part of a study program of the HT-CMC behavior and their damagemechanisms, the objective of this thesis is to build a multi-physics numerical model todetermine the lifetime of a sample such a material subjected to a mechanical stress in anoxidizing environment. The study focuses on the establishment of a coupling between twocomputer codes: a code of mechanical damage and a physical-chemical code that wasdeveloped during this thesis. In an unprecedented way, we place ourselves in the 2D geometryof a crack plane, starting from a detailed picture of the arrangement of the components (fiber,interphase, multi-layer matrix). The different parts of the code have been independentlyvalidated and the results of the complete calculation are presented and discussed
Peng, Lingling. "Modélisation numérique d'assemblages collés : application à la réparation de structures en composites." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00910094.
Full textHemon, Elen. "Modèles multi-niveaux de prévision des durées de vie en fatigue des structures composites à matrice céramique pour usage en turbomachines aéronautiques." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-01020093.
Full textBen, Ramdane Camélia. "Etude et modélisation du comportement mécanique de CMC oxyde/oxyde." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0077/document.
Full textOxide/oxide CMCs are good candidates for thermostructural applications. Themechanical behaviour and damage mechanisms of two alumina/alumina composites with two andthree dimensional woven reinforcements were studied and compared. The microstructure of theseweak matrix CMCs was characterized by porosimetry and NDT methods, such as IR thermography,ultrasound scanning and X-ray tomography, which highlighted initial defects. The mechanicalbehaviour was studied through tensile tests, as well as compression tests in the case of the twodimensionalreinforced CMC. These tests were conducted at room temperature, in the fibres directionsand in the ±45° direction. In order to fully exploit these tests, several extensometry and damagemonitoring methods, such as IR thermography and acoustic emission, were used. Young’s moduli andmaximum stresses and strains of the two-dimensional reinforced CMC developed at Onera appearedto be higher than those available in the literature. The damage mechanisms of the materials weredetermined by post mortem SEM observations and in situ testing in a SEM, which made it possible toassess the nocivity of initial defects. Studying the mechanical behaviour of these composites finallyenabled the development of a three-dimensional damage model that will facilitate the furtherdevelopment of such materials, through finite element analysis. Finally, some improvements regardingthe manufacturing processes and the instrumentation for damage monitoring were suggested forfuture studies