Добірка наукової літератури з теми "Impact – Composites – Délaminage"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Зміст
Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Impact – Composites – Délaminage".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Дисертації з теми "Impact – Composites – Délaminage"
Prombut, Pongtorn. "Caractérisation de la propagation de délaminage des stratifiés composites multidirectionnels." Toulouse 3, 2007. http://thesesups.ups-tlse.fr/27/.
Повний текст джерелаThe objective of this study is to develop a methodology for establishing delamination propagation criteria of multidirectional (MD) composite laminates. A test strategy was defined in order to evaluate the delamination resistance of the interface type θ°/0° under mixed modes I+II without resorting to the test in pure mode I. The mode I test was avoided due to an anticipated problem of delamination migrating out of the intended interface. Two stacking sequences MD, symmetric and asymmetric, with a delamination interface of 45°/0° were determined using classical lamination theory and finite element simulation. Then, the characterization tests were performed on a carbon/epoxy composite (T700/M21) at the interfaces 0°/0° (UD) and 45°/0° (MD). The procedure used for determining the MD lay-ups resulted in desirable behaviors of the specimens under delamination tests. After that, the test results were analyzed using experimental, analytical, and numerical approaches. The experimental compliance method proved to be the most suitable tool in determining the delamination resistance (GC). Finite element simulation was used for mode partitioning. The delamination was modeled in a “resin interlayer” of the interface. Finally, the propagation responses of each interface were represented by a semi-empirical criterion. The comparison of the criteria shows that the two interfaces have a comparable resistance to the pure mode I loading while the interface 45°/0° is more resistant to the delamination in mixed modes I+II and pure mode II
Deconinck, Paul. "Étude du comportement à l’impact de matériaux composites renforcés par tufting." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0246/document.
Повний текст джерелаEconomic and ecological contexts impose aircraft manufacturers to find short-term solutions to reduce fuel consumption. For years they have tended to replace metallic structural frames with state-of-the-art composite materials. Some parts such as aircraft engine inlets are however exposed to ice and bird impacts but are also affected by low-energy impacts that could happen during maintenance operations. Yet laminated composites have poor resistance to delamination, which is the main damage genera- ted during impact events. Delamination is known to reduce the post-impact integrity of a structure and is not easy to detect. It is thus necessary to find solutions to re- duce its propagation. The goal of this work is therefore to evaluate the ability of a z-reinforcement technique – the tufting – to contain delamination but also to increase impact resistance. This technique is based on textile sewing techniques. A new ballistic bench with associated sensors has been developed for this study. It allows to carry out impact tests at speeds up to 200 m.s-1 with a 250 g projectile. These tests were carried out for different tufting configurations applied to the same reference material. The tufting parameters were: the pitch, the thread section, the thread material and the areal tufting density. The impact velocities were 60, 80, 110 and 150 m.s-1. Absorbed energies were measured and compared for all configurations. They allowed to draw trends about the effects of tufting parameters on impact resistance. The perforated specimens were then inspected with an original technique allowing the observation of interlaminar delamination area for each interface. The effects of tufting on damage tolerance have therefore been highlighted. It has also revealed the existence of preferential propagation direction of delamination. These directions depend on the stacking sequence and on the fabric architecture. A propagation law for delamination has been developed as a function of the direction of the fiber directions of the adjacent plies. This law has at the end been implemented into a finite element analysis model
Petit, Sandrine. "Contribution à l'étude de l'influence d'une protection thermique sur la tolérance aux dommages des structures composites des lanceurs." Toulouse, ENSAE, 2005. http://www.theses.fr/2005ESAE0038.
Повний текст джерелаTawk, Issam. "Contribution à la modélisation à l'impact de pales d'hélicoptère." Toulouse 3, 2009. http://thesesups.ups-tlse.fr/503/.
Повний текст джерелаThis study is a contribution to the modelling of impact on helicopter blades. Experimental tests of impact were made with a compressed gas gun on sections of blades at different levels of energy. These tests were used to establish the damage in terms of impact velocity. Additional tests showed that the stratification and the reinforcement of the skin change the behaviour of the blade during the impact. A modelling approach is developed with the finite element code RADIOSS. It consists in controlling the degradation of the front edge that appears by a break of the resin and by the appearance of bundles of fibers. This approach is realised by modelling the resin with 3D damaged elements and the bundles of fibers by 1D elements. Delamination was modelled with a thin layer of damaged elements. To enrich the proposed modelling and to take into account all types of delamination observed experimentally, a local global approach for modelling the delamination is developed. This approach, built with the use of a specific 3D element PEC, is based on the VCCT method. It is validated through the simulation of different beam tests DCB, ELS, ENF and ADCB
Benmedakhene, Salim. "Étude phénoménologique du comportement à l'impact des matériaux composites." Compiègne, 1996. http://www.theses.fr/1996COMPD918.
Повний текст джерелаSmaoui, Mourad. "Nouvelle modélisation multiparticulaire pour l'analyse des efforts dans les plaques composites multicouches impactées." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1996. http://tel.archives-ouvertes.fr/tel-00529386.
Повний текст джерелаSoulas, Floriane. "Développement d'un modèle mécanique pour la prédiction des dommages de panneaux composites aéronautiques soumis à un choc foudre." Thesis, Toulouse, ISAE, 2016. http://www.theses.fr/2016ESAE0004/document.
Повний текст джерелаIn an industrial context where more and more composite materials are integrated into primary structures, the lightning threat has become a major issue for aircraft manufacturers. As lightning strikes in service airplane about once a year, the new composite structures, with a lower electrical conductivity than their metallic predecessors, must be protected. The protections already integrated by manufacturers are mainly made of expanded metallic foil layered above the composite lay-up, thus adding weight on the low density structures and reducing the gain of weight. The optimization of such structures and counsel concerning lightning protection become a major industrial stake. In the scope of the PhD work, the proposed work focused on the study of the damage mechanisms due to lightning strikes on protected composite panels in order to optimize or offer adequate protections against this threat. A methodology is proposed to determine a mechanical impact on a bare composite plate equivalent to a protected and even painted structure submitted to a lightning impact. An experimental campaign of mechanical impacts using a canon gas gun coupled to a numerical plan is led and allows concluding on the strategy and its validity by taking into account the state surface of the lightning samples
Aboissière, Jacky. "Propagation de dommages d'impact dans un matériau composite stratifié à fibres de carbone et résine époxyde." Toulouse 3, 2003. http://www.theses.fr/2003TOU30027.
Повний текст джерелаManseri, Ldjoudi. "Développement d'une stratégie d'endommagement intra/interlaminaire pour une approche semi-continue : application aux stratifiés unidirectionnels et hybrides." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30259.
Повний текст джерелаComposite structures composed by unidirectional layers are widespread in the aeronautical field for their very high strength to mass ratio. However, they may undergo impacts that can generate matrix cracking, delamination and fiber breakage. This has an adverse effect during low velocity impacts, especially on thick structures where delaminations, are located inside the structure and are difficult to detect with the naked eye. The objective is then to propose a model able to catch very precisely the initiation and the propagation of delamination based on the Semi-Continuous strategy. This work begins with the development of a new intralaminar interface element able to get the behavior of matrix cracking, precursor of delamination. This element is inserted between UD elements (rods + shell) of the Semi-Continuous strategy developed in previous works. In order to represent the link between matrix cracking and delamination, a intra/interlaminar coupling is introduced. The addition of this specific element required to adapt the behavior of other elements of the model so that the overall kinematics would be consistent with experimental results. This strategy was validated through quasi-static indentation and impact tests at different energies. The numerical results obtained correlate very satisfactorily with those of the tests. Finally, tests on hybrid laminates (UD/Woven) were carried out on the one hand to optimize the response of thick structures and on the other hand to evaluate the response of the model in situations outside its validation area
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.
Повний текст джерелаDamage 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