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Letteratura scientifica selezionata sul tema "Structures composite sandwich architecturée"

Autore: Grafiati

Pubblicato: 19 ottobre 2024

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Articoli di riviste sul tema "Structures composite sandwich architecturée"

Proietti, Alice, Nicola Gallo, Denise Bellisario, Fabrizio Quadrini e Loredana Santo. "Damping Behavior of Hybrid Composite Structures by Aeronautical Technologies". Applied Sciences 12, n. 15 (8 agosto 2022): 7932. http://dx.doi.org/10.3390/app12157932.

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Hybrid composite laminates are manufactured by using technologies and raw materials of the aeronautic sector with the aim to improve the damping behavior of composite structures. Matrix hybridization was achieved by laminating carbon fiber reinforced (CFR) plies with elastomer interlayers. Up to 10 different composite sandwich architectures were investigated by changing the stacking sequence, the thickness of the elastomer layers, and the elastomer typology, whereas the total number of the CFR plies was fixed to six for all the hybrid composites. Square panels with the size of 300 × 300 mm2 were autoclave molded with vacuum bagging, and rectangular samples were extracted for static and dynamic tests. Dynamic mechanical analyses were performed to measure the storage modulus and loss factor of hybrid materials, which were compared with static and dynamic performances of the composite structures under bending. Repeated loading–unloading cycles and free oscillation tests allowed us to the energy loss per unit of volume, and the acceleration damping, respectively. Results show that softest elastomer interlayers lead to big loss of stiffness without any positive effect in the damping behavior, which worsens as well. By using soft elastomers, complex architectures do not provide any additional benefit in comparison with the traditional sandwich structure with soft core and hard skins.

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N, Ahobal, Lakshmi Pathi Jakkamputi, Sakthivel Gnanasekaran, Mohanraj Thangamuthu, Jegadeeshwaran Rakkiyannan e Yogesh Jayant Bhalerao. "Dynamic Behavior Modeling of Natural-Rubber/Polybutadiene-Rubber-Based Hybrid Magnetorheological Elastomer Sandwich Composite Structures". Polymers 15, n. 23 (30 novembre 2023): 4583. http://dx.doi.org/10.3390/polym15234583.

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This study investigates the dynamic characteristics of natural rubber (NR)/polybutadiene rubber (PBR)-based hybrid magnetorheological elastomer (MRE) sandwich composite beams through numerical simulations and finite element analysis, employing Reddy’s third-order shear deformation theory. Four distinct hybrid MRE sandwich configurations were examined. The validity of finite element simulations was confirmed by comparing them with results from magnetorheological (MR)-fluid-based composites. Further, parametric analysis explored the influence of magnetic field intensity, boundary conditions, ply orientation, and core thickness on beam vibration responses. The results reveal a notable 10.4% enhancement in natural frequencies in SC4-based beams under a 600 mT magnetic field with clamped–free boundary conditions, attributed to the increased PBR content in MR elastomer cores. However, higher magnetic field intensities result in slight frequency decrements due to filler particle agglomeration. Additionally, augmenting magnetic field intensity and magnetorheological content under clamped–free conditions improves the loss factor by from 66% to 136%, presenting promising prospects for advanced applications. This research contributes to a comprehensive understanding of dynamic behavior and performance enhancement in hybrid MRE sandwich composites, with significant implications for engineering applications. Furthermore, this investigation provides valuable insights into the intricate interplay between magnetic field effects, composite architecture, and vibration response.

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Mat Rejab, Mohd Ruzaimi, W. A. W. Hassan, Januar Parlaungan Siregar e Dandi Bachtiar. "Specific Properties of Novel Two-Dimensional Square Honeycomb Composite Structures". Applied Mechanics and Materials 695 (novembre 2014): 694–98. http://dx.doi.org/10.4028/www.scientific.net/amm.695.694.

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Hexagonal honeycomb cores have found extensive applications particularly in the aerospace and naval industries. In view of the recent interest in novel strong and lightweight core architectures, square honeycomb cores were manufactured and tested under uniform lateral compression. A slotting technique has been used to manufacture the square honeycomb cores based on three different materials; glass fibre-reinforced plastic (GFRP), carbon fibre-reinforced plastic (CFRP) and self-reinforced polypropylene (SRPP). As semi-rigid polyvinyl chloride (PVC) foam was placed in each of unit cells to further stiffen the core structure. The core then was bonded to two skins to form a sandwich structure. The compressive responses of the sandwich structures were measured as a function of relative density. In this paper, particular focus is placed on examining the compression strength and energy absorption characteristics of the square honeycombs with and without the additional foam core. Comparisons in terms of specific strength and specific energy absorption have shown that the CFRP core offers excellent properties. The presence of the foam core significantly increases the energy absorption capability of overall structure and the SRPP core could potentially be used as an alternative lightweight core material in recyclable sandwich structures.

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Cheng, Mai-Li, Shao-Heng Guo e Zhi-Peng Huo. "Numerical Simulation Study on Mechanical Bearing Behavior of Arch Steel–Concrete Composite Sandwich Roof". Buildings 14, n. 1 (13 gennaio 2024): 218. http://dx.doi.org/10.3390/buildings14010218.

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In order to study the mechanical bearing behavior of arched sandwich roof structures, a full combination and independent action mode of concrete sandwich composite panels was constructed using the finite element method, and an arched steel–concrete composite sandwich roof with a span of 18 m was subjected to a numerical simulation test under a full-span vertical uniformly distributed load, with the bearing characteristics of the arched sandwich roof discussed in depth. The results show that the cross-sections of l/16 and l/2 of the elliptical arch sandwich roof are weak sections, and the tensile cracking of concrete appears for the first time in the upper and lower wythes of the elliptical arch sandwich roof, the von Mises stress level of the lower wythe of the l/16 section is higher under the ultimate load, and the roof shows four-part form failure characteristics. With the expansion of the cracking range of the upper and lower concrete wythes of the steel–concrete composite sandwich arch roof, the load–displacement curve of the roof structure does not decrease significantly, and the bearing capacity of the structure is high and the vertical deformation is small. The steel–concrete composite segment at the end of the roof effectively strengthens the edge constraint of the roof and improves the integrity of the sandwich roof. The upper and lower concrete wythes of the sandwich roof show a fully combined action mode in the elastic working stage and, when the concrete cracks, it shows a partial combined action mode.

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Shahbazi, Sepideh, Nicholas Singer, Muslim Majeed, Miroslava Kavgic e Reza Foruzanmehr. "Cementitious Insulated Drywall Panels Reinforced with Kraft-Paper Honeycomb Structures". Buildings 12, n. 8 (17 agosto 2022): 1261. http://dx.doi.org/10.3390/buildings12081261.

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Standard building practices commonly use gypsum-based drywall panels on the interior wall and ceiling applications as a partition to protect the components of a wall assembly from moisture and fire to uphold the building code and ensure safety standards. Unfortunately, gypsum-based drywall panels have poor resistance to water and are susceptible to mold growth in humid climates. Furthermore, the accumulation of drywall in landfills can result in toxic leachate impacting the surrounding environment. A proposed solution to the pitfalls of gypsum-based drywall arises in its substitution with a new lightweight composite honeycomb sandwich panel. This study aimed to develop sandwich panels with improvements in flexural strength and thermal insulating properties through the combined use of cementitious binder mix and kraft-paper honeycomb structures. The proposed alternative is created by following standard practices outlined in ASTM C305 to create cement panels and experimenting with admixtures to improve the material performance in order to cater to a drywall panel application. The kraft-paper honeycomb structure is bonded to cured cementitious panels to create a composite “sandwich panel” assembly. The results indicate that the sample flexural strength performed well after 7 days and exhibited superior flexural strength at 28 days, while providing a substantial increase in R-value of 5.84 m2K/W when compared to gypsum-based panels, with an R-value of 5.41 m2K/W. In addition, the reinforced kraft-paper honeycomb with a thick core and addition of flax fibres to the cementitious boards possesses better thermal conductivity, with a reduction of 42%, a lower density, and a lower water vapour transmission in comparison to the thin kraft-paper honeycomb sandwich panel.

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Rupp, Peter, Peter Elsner e Kay A. Weidenmann. "Specific bending stiffness of in-mould-assembled hybrid sandwich structures with carbon fibre reinforced polymer face sheets and aluminium foam cores manufactured by a polyurethane-spraying process". Journal of Sandwich Structures & Materials 21, n. 8 (13 agosto 2017): 2779–800. http://dx.doi.org/10.1177/1099636217725250.

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In this paper, the bending stiffness-to-weight-ratio of novel hybrid sandwich structures is investigated. The build-up of the sandwich panels consisted of face sheets made from carbon fibre reinforced polymer, aluminium foam cores and an interface of foamed polyurethane. The sandwich panels were produced in a single step, infiltrating the face sheet fibres and connecting the face sheets to the core simultaneously. By means of mechanical characterization, specimens with several variations of face sheet architecture and thickness, core structure and interface properties were examined. Quasi-static four-point bending and flatwise compression tests of the sandwich composites were conducted, as well as tensile tests of the face sheets. The results of the tensile and compressive tests were integrated in analytical models, describing the sandwich stiffness depending on the load case and the face sheet volume fraction. The effective Young’s modulus of the composite, measured in the four-point bending test, correlates well to the modelled effective bending modulus calculated from the single components face sheet and core. The model underestimates the effective density of the bending specimens. It could be shown that this underestimation results from the polyurethane foam connecting the face sheets to the core, as the mass of this polyurethane is not included in the model.

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Tawil, Herman, Chee Ghuan Tan, Nor Hafizah Ramli Sulong, Fadzli Mohamed Nazri, Muhammad M. Sherif e Ahmed El-Shafie. "Mechanical and Thermal Properties of Composite Precast Concrete Sandwich Panels: A Review". Buildings 12, n. 9 (11 settembre 2022): 1429. http://dx.doi.org/10.3390/buildings12091429.

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Precast concrete sandwich panels (PCSPs) are utilized for the external cladding of structures (i.e., residential, and commercial) due to their high thermal efficiency and adequate composite action that resist applied loads. PCSPs are composed of an insulating layer with high thermal resistance that is mechanically connected to the concrete. In the recent decades, PCSPs have been a viable alternative for the fast deployment of structures due to the low fabrication and maintenance cost. Furthermore, the construction of light and thin concrete wythes that can transfer and resist shear loads has been achieved with the utilization of high-performance cementitious composites. As a result, engineers prefer PCSPs for building construction. PCSP design and use have been examined to guarantee that a building is energy efficient, has structural integrity, is sustainable, is comfortable, and is safe. Hence, this paper reviews the expanding knowledge regarding the current development of the mechanical and thermal properties of the PCSPs components; subsequently, future potential research directions are suggested.

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Huang, Zhenyu, Xiaolong Zhao, Yutao Guo e Xiangqian Liu. "Residual Flexural Performance of Double-Layer Steel–RLHDC Composite Panels after Impact". Buildings 13, n. 12 (23 novembre 2023): 2916. http://dx.doi.org/10.3390/buildings13122916.

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The mechanical behavior of steel–concrete–steel (SCS) sandwich composite structures under low- or high-velocity impact loading has garnered increasing attention from researchers in recent decades. However, to date, limited effort has been dedicated to studying the residual resistance of SCS sandwich composite structures following impact damage. In a previous investigation, the authors developed a rubberized lightweight high-ductility cement composite (RLHDC) for implementation in double-layer steel–RLHDC–steel composite panels and examined the dynamic response of these panels under impact. To further explore the residual performance of impact-damaged composite panels, the present study conducts flexural tests on nine such panels. The study quantifies and analyzes the effects of various connector types, connector spacing, number of concrete layers, rubber powder content, and number of impacts on the residual flexural resistance of the impact-damaged composite panels. Detailed analysis is conducted on the failure modes, load–displacement curves, strain curves, and load–slip curves of the impact-damaged specimens. The test results reveal that the impact-damaged composite panels experience flexural failure with bond slip under static load. The residual flexural performance is found to be sensitive to the number of concrete layers and number of impacts. Finite element (FE) simulations are performed using LS-DYNA to investigate the residual flexural behavior of the impact-damaged composite panels. The restart method is employed in the simulations to mimic the post-impact static loading scenario. The agreement between the FE results and the experimental findings validates the model and provides a straightforward and effective approach for studying the residual performance of composite structures. An expanded parameter analysis leveraging the calibrated FE model indicates that the steel plate’s thickness and strength predominantly influence the composite panel’s residual resistance, whereas the influence from concrete strength proves less consequential.

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Stanisavljević, Gorjana, Darinka Golubović Matić, Milorad Komnenović, Ivana Vasović Maksimović e Željko Flajs. "Numerical and Experimental Study on Loading Behavior of Facade Sandwich Panels". Buildings 13, n. 6 (18 giugno 2023): 1554. http://dx.doi.org/10.3390/buildings13061554.

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This paper focuses on the study of the strength of facade sandwich panels used in building construction. The paper describes the results of experimental and numerical research on the behavior of sandwich panels made of polyisocyanurate core (PIR) and their structural connections when exposed to tensile and compressive loads. In the initial phase of this study, laboratory tests were performed to determine the physical and mechanical characteristics of the material from which the sandwich panels are made. Laboratory tensile and compression tests were performed on small samples of sandwich facade panels. In order to verify the obtained results, they were compared with the numerical analysis performed in the ANSYS software. The numerical model was found to accurately predict the results of the laboratory tests, suggesting that the model can be used to predict the behavior of these panels under different loads in service. The study showed that the foam core sandwich panel exhibits excellent mechanical properties. The results indicate the suitability of foam-based composite structures in the construction industry for various applications, such as roof and wall structures. The findings of this study may help in the development of lightweight and durable construction materials for the industry.

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Li, Chang-Hui, Jia-Bao Yan e Hui-Ning Guan. "Finite element analysis on enhanced C-channel connectors in SCS sandwich composite structures". Structures 30 (aprile 2021): 818–37. http://dx.doi.org/10.1016/j.istruc.2021.01.050.

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Tesi sul tema "Structures composite sandwich architecturée"

Rallo, Ayerbe Marta. "Impact sur structure composite sandwich architecturée : application aux pales d'avions". Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES088.

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La sécurité constitue un aspect essentiel au développement des pièces et assemblages aéronautiques. Pour un avion à hélices, les pales assurent la propulsion de l'appareil, et garantissent sa portance. Elles sont essentielles. C'est pourquoi des essais de certification à l'impact oiseau sont nécessaires afin de garantir la capacité de l'avion à se poser en mode dégradé. Ces essais ont lieu à la fin de la phase de développement. Une caractérisation du comportement à l'impact en amont est nécessaire afin d'éviter d'éventuels coûts supplémentaires liés aux mauvais résultats de ces tests Les pales d'avion étudiées sont des structures composites sandwiches complexes, composées d'une âme en mousse polymère et de plusieurs couches parmi lesquelles on trouve des tresses composites, des plis composites unidirectionnels, de la mousse polymère, des renforts métalliques, des interfaces collées et autres constituants spécifiques (protection foudre, peinture...). De nombreux matériaux sont donc à considérer pour l'étape de caractérisation. A cela s'ajoute la conciliation de phénomènes à des échelles microscopiques et macroscopiques. Le travail de recherche s'attachera dans un premier temps à comprendre et à caractériser les phénomènes d'endommagement dans les conditions de certification d'impact oiseau. Cette première étape doit permettre de hiérarchiser les phénomènes physiques afin de guider le développement d'un modèle de pré-dimensionnement. Dans un second temps, une campagne d'essais de caractérisation sera menée sur les éléments constitutifs de la pale pour alimenter le modèle. Enfin, dans un troisième temps, des essais sur une éprouvette représentative d'un tronçon de pale seront menés ainsi qu'une étude de sensibilité pour mettre en évidence la capacité du modèle à représenter le phénomène étudié
Safety is a crucial aspect in the development of aeronautical parts and assemblies. For a propeller aircraft, the blades ensure the propulsion of the aircraft and guarantee its lift. They are essential. This is why bird strike certification tests are necessary to ensure the aircraft's ability to land in a degraded mode. These tests take place at the end of the development phase. An upstream characterization of impact behavior is necessary to avoid potential additional costs associated with poor test results. The aircraft blades studied are complex sandwich composite structures, consisting of a polymer foam core and several layers, including composite braids, unidirectional composite plies, polymer foam, metallic reinforcements, bonded interfaces, and other specific components (lightning protection, paint, etc.). Therefore, numerous materials need to be considered during the characterization phase. Additionally, it is necessary to reconcile phenomena at both microscopic and macroscopic scales. The research work will initially focus on understanding and characterizing damage phenomena under bird strike certification conditions. This first step should allow the prioritization of physical phenomena to guide the development of a preliminary sizing model. In the second phase, a characterization test campaign will be conducted on the constituent elements of the blade to feed the model. Finally, in the third phase, tests on a representative specimen of a blade section will be conducted, as well as a sensitivity study to highlight the model's ability to represent the studied phenomenon

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Davies, Andrew. "Crashworthiness of composite sandwich structures". Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/8402.

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Kazemahvazi, Sohrab. "Impact Loading of Composite and Sandwich Structures". Doctoral thesis, KTH, Lättkonstruktioner, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-25141.

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Low weight is one of the most important factors in the design process of high speed naval ships, road vehicles and aircrafts. Lower structural weight enables the possibility of down-sizing the propulsion system and thus decrease manufacturing and operating costs as well as reducing the environmental impact. Two efficient ways of reducing the structural weight of a structure is by using high performance composite materials and by using geometrically efficient structures such as the sandwich concept. In addition to good quasi-static performance different structures have dynamic impact requirements. For a road vehicle this might be crash worthiness, an aircraft has to be able to sustain bird strikes or debris impact and a naval ship needs to be protected against blast or ballistic loading. In this thesis important aspects of dynamic loading of composite and sandwich structures are addressed and presented in the appended papers as follows. In paper A the notch sensitivity of non-crimp fabric glass bre composites is investigated. The notch sensitivity is investigated for several different laminate con gurations at varying tensile loading rate. It is shown that the non-crimp fabrics have very low notch sensitivity, especially for laminate con gurations with a large amount of bres in the load direction. Further, the notch sensitivity is shown to be fairly constant with increasing loading rates (up to 100/s). In paper B a heuristic approach is made in order to create an analytical model to predict the residual strength of composite laminates with multiple randomly distributed holes. The basis for this model is a comprehensive experimental programme. It is found that unidirectional laminates with holes predominantly fail through three failure modes: global net-section failure, local net-section failure and local shear failure. Each failure mode can be described by a physical geometric constant which is used to create the analytical model. The analytical model can predict the residual strength of unidirectional laminates with multiple, randomly distributed holes with good accuracy. In paper C and paper D, novel prismatic high performance all-composite sandwich cores are proposed. In paper C an analytical model is developed that predicts the strength and sti ness properties of the suggested cores. In paper D the prismatic cores are manufactured and tested in shear loading and out-of-plane compression loading. Further, the analytical model is used to create failure mechanism maps to map out the overall behaviour of the different core con gurations. The novel cores show very high speci c strength and sti ness and are potential candidates as cores in high performance naval ship hulls. In paper E the dynamic properties of prismatic composite cores are investigated. The dynamic out-of-plane strength of an unit cell is tested experimentally in a gas gun - Kolsky bar set-up. Especially, different failure mechanisms and their e ect on the structural strength are investigated. It is found that cores with low relative density (slender core members) show very large inertial stabilisation e ects and have a dynamic strength that can be more than seven times higher than the quasi-static strength. Cores with higher relative density show less increase in dynamic strength. The main reason for the dynamic strengthening is due to the strain rate sensitivity of the parent material rather than inertial stabilisation of the core members.
QC 20101014

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Denli, Huseyin. "Structural-acoustic optimization of composite sandwich structures". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 168 p, 2007. http://proquest.umi.com/pqdlink?did=1251904511&Fmt=7&clientId=79356&RQT=309&VName=PQD.

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Akil, Hazizan Md. "The impact response of composite sandwich structures". Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399096.

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Trask, Richard Simon. "Damage tolerance of repaired composite sandwich structures". Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416072.

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Slade, R. "Composite faced sandwich construction for primary spacecraft structures". Thesis, Cranfield University, 1989. http://hdl.handle.net/1826/3827.

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This study investigated the application of fibre reinforced composite materials to spacecraft sandwich structures. In particular, aspects of the manufacture, analysis and design optimisation of components fabricated using the co-cure process were studied. The manufacturing process was developed to ultimately enable a full size thrust tube structure to be built using a single step cure, the design of which was verified by a modal survey test. Techniques for the analysis of stiffness, strength., vibration frequencies and local instability were established and found to correlate well with tests on co-cured sandwich specimens. The current wrinkling theory for composite faced sandwich was extended to the more general case to allow facesheet constitutive matrix coupling and multiaxial loding to be accomodated. The analytical methods were incorporated within simple optimisation schemes, amenable to employment at the preliminary design stage, to allow alternative feasible designs for panel and thrust tube structures to be generated. These illustrated the benefits of the use of composite materials and the co-cure manufacturing technique for spacecraft sandwich components.

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Violette, Michael A. "Fluid structure interaction effect on sandwich composite structures". Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5533.

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Approved for public release; distribution is unlimited.
The objective of this research is to examine the fluid structure interaction (FSI) effect on composite sandwich structures under a low velocity impact. The primary sandwich composite used in this study was a 6.35-mm balsa core and a multi-ply symmetrical plain weave 6 oz E-glass skin. The specific geometry of the composite was a 305 by 305 mm square with clamped boundary conditions. Using a uniquely designed vertical drop-weight testing machine, there were three fluid conditions in which these experiments focused. The first of these conditions was completely dry (or air) surrounded testing. The second condition was completely water submerged. The final condition was a wet top/air-backed surrounded test. The tests were conducted progressively from a low to high drop height to best conclude the onset and spread of damage to the sandwich composite when impacted with the test machine. The measured output of these tests was force levels and multi-axis strain performance. The collection and analysis of this data will help to increase the understanding of the study of sandwich composites, particularly in a marine environment.

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Kulandaival, Palanivel Palaniathevar. "Manufacturing and performance of thermoplastic composite sandwich structures". Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438298.

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Velecela, Chuquilla Orlando Jonathan. "Energy absorption capability of GRP composite sandwich structures". Thesis, University of Sheffield, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434504.

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Più fonti

Libri sul tema "Structures composite sandwich architecturée"

Abrate, Serge. Dynamic Failure of Composite and Sandwich Structures. Dordrecht: Springer Netherlands, 2013.

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Abrate, Serge, Bruno Castanié e Yapa D. S. Rajapakse, a cura di. Dynamic Failure of Composite and Sandwich Structures. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5329-7.

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Chamis, C. C. Fiber composite sandwich thermostuctural behavior, computationalsimulation. [Washington, DC]: National Aeronautics and Space Administration, 1986.

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Lee, Sung W., a cura di. Advances in Thick Section Composite and Sandwich Structures. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-31065-3.

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Daniel, I. M., E. E. Gdoutos e Y. D. S. Rajapakse, a cura di. Major Accomplishments in Composite Materials and Sandwich Structures. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3141-9.

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Gopalakrishnan, Srinivasan, e Yapa Rajapakse, a cura di. Blast Mitigation Strategies in Marine Composite and Sandwich Structures. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7170-6.

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Cheung, E. W. Buckling of composite sandwich cylinders under axial compression. Amsterdam: Elsevier Science Publishers, 1988.

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Cheung, Eric Waihon. Buckling of composite sandwich cylinders under axial compression. [Downsview, Ont.]: Dept. of Aerospace Science and Engineering, University of Toronto, 1988.

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Somers, M. Buckling and postbuckling behavior of sandwich structures in the presence of a delamination. Haifa: Technion Israel Institute of Technology, Dept. of Aeronautical Engineering, 1989.

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Somers, M. Effect of delamination location on postbuckling behavior of sandwich structures. Haifa, Israel: Technion-Israel Institute of Technology, Faculty of Aerospace Engineering, 1989.

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Più fonti

Capitoli di libri sul tema "Structures composite sandwich architecturée"

Gay, Daniel. "Sandwich Structures". In Composite Materials, 73–86. 4^a ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003195788-5.

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Ferreira, António J. M., Joaquim A. O. Barros e António Torres Marques. "Finite Element Analysis of Sandwich Structures". In Composite Structures, 105–18. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3662-4_8.

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Hwu, Chyanbin. "Composite Sandwich Construction". In Mechanics of Laminated Composite Structures, 180–250. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003470465-6.

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Vargas-Rojas, Erik. "Composite Sandwich Structures in Aerospace Applications". In Sandwich Composites, 293–320. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003143031-15.

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Hassouna, S., M. Janane Allah e A. Timesli. "Crashworthiness Applications of the Composite Sandwich Structures". In Sandwich Composites, 321–48. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003143031-16.

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Nguyen, Thuy Thi Thu, Tuan Anh Le e Quang Huy Tran. "Composite Sandwich Structures in the Marine Applications". In Sandwich Composites, 277–91. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003143031-14.

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Heinisuo, M. T., S. J. Malmi e A. I. J. Möttönen. "Exact Finite Element Method for Sandwich Beams". In Composite Structures 4, 536–54. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3455-9_42.

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Chao, C. C., W. S. Kuo e I. S. Lin. "Buckling of Unstiffened/Stiffened Orthotropic Foam Sandwich Cylindrical Shells". In Composite Structures 3, 452–67. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4952-2_32.

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Drechsler, K., J. Brandt e F. J. Arendts. "Integrally Woven Sandwich-Structures". In Developments in the Science and Technology of Composite Materials, 365–69. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1123-9_50.

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Fages, A., e G. Verchery. "Transverse Shear Influence on Calculus of Natural Frequencies of Sandwich Beams". In Composite Structures 3, 643–59. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4952-2_46.

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Atti di convegni sul tema "Structures composite sandwich architecturée"

PRABHAKAR, PAVANA, VINAY DAMODARAN, e ABARINATHAN PUSHPARAJ SUBRAMANIYAN. "ONR REVIEW: ARCHITECTED COMPOSITES FOR DAMAGE TOLERANCE IN EXTREME CONDITIONS". In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35869.

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The long-term goal of this ONR funded project is to facilitate the design of architected composites that play a key role in damage tolerant and resilient structures. The main emphasis is on developing new composite structures with improved performance and durability as compared to conventional structural composites. To that end, we will present our work in detail on the following within the realm of sandwich composites along with a novel Machine Learning framework for stress prediction in composites: 1) Novel recoverable sandwich composite structures: Traditional sandwich cores such as foam core or honeycomb structures are good options for enabling lightweight and stiff structures. Although, these cores are known to dissipate energy under extreme conditions such as impact loading, they experience permanent damage. Here, our goal is to design core structures that undergo substantial deformation without accumulating damage and recover their original geometric configuration after the loading is removed. In contrast to a traditional foam or honeycomb structure, we have developed a multi-layer architected core design that facilitates significant deformation beyond the initial peak load, yielding a larger energy dissipation during impact and other extreme loading scenarios. We utilize the concept of pseudo-bistability of truncated cone unit cells to achieve elastic buckling for energy dissipation and shape recovery of core structures. 2) Tailoring of sandwich composite facings: Our objective is to establish the influence of fiber architecture on moisture diffusion pathways in FRPC facings for enabling damage tolerant facing designs. To that end, we have evaluated the moisture kinetics in FRPCs by developing micromechanics based computational models within FEM. We have explained the effect of tortuous diffusion pathways that manifest within FRPCs due to internal fiber architectures. Finally, we established the relationship between tortuosity and diffusivity that can be used for studying moisture diffusion in other FRPCs.

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Pochiraju, Kishore. "A Composite Sandwich Structure With Embedded MEMS-Based Vibration Sensing". In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0546.

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Abstract This paper presents a sandwich composite architecture suitable for embedding MEMS-based accelerometers for long-term vibration monitoring or to act as sensors in adaptive structures. The presented architecture is designed around multi-axis accelerometers and temperature sensors that are commercially available. These devices also integrate sophisticated sensor compensation and data acquisition hardware into a single integrated circuit chip package. The paper presents the stiffness modeling of a sandwich composite with embedded accelerometers based on classical lamination theory. The first order shear deformation theory is used to compute the free vibration response of the sandwich composite. Solutions are presented for the free-vibration response of the sandwich beam under fixed-free boundary conditions. Results presented also include the response obtained from the MEMS-accelerometer when coupled to a thick cross-ply laminate under fixed-free boundary conditions.

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Cai, Wei, Shuxin Li e Ling Zhu. "Repeated Low-Velocity Impacts on Dynamic Failure Mechanisms of Composite Sandwich Panels With PVC Foam Cores". In ASME 2024 43rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/omae2024-133108.

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Abstract Composite sandwich structures have been widely used in naval architecture and ocean engineering field, thanks to their excellent properties like high strength to weight and stiffness to weight ratios, favourable energy-absorbing capacity, reduced corrosion tendency and design flexibility. Due to complex service conditions such as collisions, ice impacts, aircraft landing impacts and falling object impacts, composite sandwich structures in marine engineering field are commonly subjected to repeated low-energy impacts at localized sites during complex service conditions, and its resultant damage may seriously affect their mechanical performance and structural safety. Therefore, to provide insight into dynamic failure behaviours, this paper performed a series of repeated low-velocity impact tests on the orthogonal woven glass fibre laminated sandwich panels with a PVC foam core layer. The variations of the mechanical characteristics and failure behaviours of composite sandwich panels against impact numbers are explored, such as peak force, dent depth, structural stiffness, failure modes and energy absorption. It is found that the accumulated impact-induced damage has a significant negative effect on the structural stiffness, failure mode, and energy absorption characteristics of composite sandwich panels. The PVC foam cores show a good energy absorption ability to protect the integrity of the bottom face sheet from repeated impacts. This research provides a detailed understanding of the damage mechanisms of composite sandwich panels under repeated impacts.

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Chung, Daniel, e Kihong Ku. "Digitally-driven Fabrication of Fiber-reinforced Composite Panels for Complex Shaped Envelopes". In AIA/ACSA Intersections Conference. ACSA Press, 2016. http://dx.doi.org/10.35483/acsa.aia.inter.16.2.

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Composite materials have been explored in architecture for their high performance characteristics that allow customization of functional properties of lightness, strength, stiffness and fracture toughness. Particularly, engineering advancements and better understanding of fiber composites have resulted in growing applications for architectural structures and envelopes. As most new developments in material fabrication start outside the realm of architecture such as in automobile and aeronautical industries, there is need to advance knowledge in architectural design to take advantage of new fabrication technologies. The authors introduce results of new digitally driven fabrication methods for fiber-reinforced composite sandwich panels for complex shaped buildings. This presentation discussed the material properties, manufacturing methods and fabrication techniques needed to develop a proof of concept system using off-the-shelf production technology that ultimately can be packaged into a mobile containerized facility for on-site panel production. The researchers conducted experiments focusing on developing a digitally controlled deformable mold to create composite relief structures for highly customized geometrical façade components. Research findings of production materials, fabrication methods and assembly techniques, are discussed to offer insights into novel opportunities for architectural composite panel fabrication and commercialization.

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Menges, Achim. "Integral Computational Design for Composite Spacer Fabric Structures: Integral Processes of Form Generation and Fabrication for Sandwich Structured Composites with 3D Warp-Knitted Textile Core". In eCAADe 2009: Computation: The New Realm of Architectural Design. eCAADe, 2009. http://dx.doi.org/10.52842/conf.ecaade.2009.289.

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Ayorinde, Emmanuel, Sadikul Islam, Hassan Mahfuz, Ronald Gibson, Feizhong Deng e Shaikh Jeelani. "Basic NDE of Some Nano Composites". In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33472.

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The influence of the nano-sized particulate or slender structures admixed into the material of regular composite structures of various architectures is being enthusiastically studied in many places across the world, but the study is yet in its infancy because there are so many aspects to be investigated. This work is basically on foam-cored structural sandwich composites, and even here there are many variables involved, for example the nano-enhancer can be introduced into the reinforcement, the matrix or the foam. The focus of the work is on some possible effects of the presence of the nano-materials on the NDE process in testing these composites. Acoustic emission is emphasized in these studies, as it appears to hold promise for non-destructively testing materials of this nature, and basic and standard mechanical test methods are employed.

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Hameury, Celia, Giovanni Ferrari, Prabakaran Balasubramanian, Tarcisio M. P. Silva, Marco Amabili, Abdulaziz Buabdulla e Giulio Franchini. "Experimental Determination of Electromechanical Coupling Matrices for Active Vibration Control of Composite Structures". In ASME 2023 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/imece2023-112610.

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Abstract Multiple input multiple output active vibration control architectures pose some common challenges to designers, such as the optimization of the number and of the position of sensors and actuators, and of the controller parameters. At a more fundamental level, however, the modeling of the electromechanical structure under control is a preliminary step necessary to perform all the optimizations described above. While some control algorithms try to prescind from a detailed modeling, some models are always required to simulate numerically the performance of the control. Finite element or reduced order models are often employed to simulate and to estimate the relationship between electrical and mechanical inputs and outputs. However, building these models can rapidly become onerous, even for relatively simple bidimensional structures, for example composite beams, plates and shells. Therefore, an experimental method was developed for the determination of the electromechanical coupling matrices. Simple experimental modal analyses were performed to obtain parameters such as natural frequencies, damping ratios, modal shapes and frequency response functions. Afterwards, a least square error algorithm, implemented in MATLAB and in Python, was used to determine the matrices that correlate transducer voltages, generalized coordinates and modal coordinates. Modal coordinates are especially useful for the construction of multiple input multiple output active vibration control algorithms that operate in the modal space; however, in these cases the inversion or the pseudo-inversion of the participation matrices had to be performed as well. The proposed method was tested on one cantilever sandwich beam and on one sandwich plate with free edges, equipped with two collocated couples of sensors and actuators and four non-collocated couples of sensors and actuators respectively. In particular, piezoelectric patches operating in flexural mode were employed as transducers. The method simulated correctly the uncontrolled electromechanical response of either structure, and its performance in this regard compared favorably with that of the finite element method. Afterwards, multiple input, multiple output positive position feedback active vibration control algorithms based on these participation matrices were built for either system, and tuned according to established method described in the relevant literature. In either case, a number of modes double with respect to that of the couples of installed actuators and sensors was controlled satisfactorily. The controllers resulted stable and negligible spillover on uncontrolled modes was observed.

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Sheahen, Patrick, Larry Bersuch, Tom Holcombe e Bill Baron. "Robust composite sandwich structures". In 39th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-1873.

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TEWANI, H. R., MEGAN HINAUS e PAVANA PRABHAKAR. "ADDITIVE MANUFACTURING AND MECHANICS OF MULTISCALE ARCHITECTED FLEXIBLE SYNTACTIC FOAMS". In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36452.

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Polymer syntactic foam is a lightweight composite consisting of hollow particles, like Glass Micro-Balloons (GMBs) or cenospheres, reinforced in a continuous polymer matrix. Due to their inherent weight-saving characteristics and enhanced mechanical properties, these foams are attractive for use in aerospace and marine industries. Recent advances in additive manufacturing (AM) techniques have enabled the development of complex-shaped parts of syntactic foams and circumvents the need for advanced highcost equipment to produce these parts. Selective Laser Sintering (SLS) is a widely adopted powder-based AM technique used to manufacture 3D parts by sintering polymer powder, and unlike other 3D printing methods, SLS does not require support structures. SLS has been reported to generate a segregated matrix system when used with Thermoplastic Urethane (TPU) in a standalone manner. However, the introduction of GMBs to this manufacturing method has thus far not been extensively studied. Consequently, the influence of GMB parameters on the mechanical response of syntactic foam with a segregated matrix is not fully understood. In this work, we use SLS to fabricate and further investigate the mechanical performance of segregated TPU matrix syntactic foam with different grades and volume fractions of (GMBs). We show for the first time that GMB size drives internal microscale architecture within syntactic foams that manifest as counterintuitive macroscale mechanical responses. That is, GMBs with a diameter larger than gaps between the cell walls of the segregated matrix get lodged between the cell walls while those smaller tend to get lodged inside the cell walls of the segregated matrix. Because of this, larger particles increase the stiffness of the syntactic foams while smaller ones do not contribute to this significantly. On the other hand, larger particles with their lower crushing strength reduce the densification stress of the foam, whereas the foam with smaller particles with higher crushing strength behaved similar to pure TPU but with significantly reduced weight. Overall, we show that coupling hollow particle parameters with print parameters can enable the fabrication of 3D printed syntactic foams with hierarchical tailored architectures and functional properties. These findings can be adapted to the development and design of cores for lightweight sandwich structures in the marine and aerospace industries.

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Fugon, D., C. Chen e K. Peters. "Self-healing sandwich composite structures". In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, a cura di Masayoshi Tomizuka, Chung-Bang Yun e Jerome P. Lynch. SPIE, 2012. http://dx.doi.org/10.1117/12.915165.

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Rapporti di organizzazioni sul tema "Structures composite sandwich architecturée"

Perez-Rivera, Anthony, Jonathan Trovillion, Peter Stynoski e Jeffrey Ryan. Simulated barge impacts on fiber-reinforced polymers (FRP) composite sandwich panels : dynamic finite element analysis (FEA) to develop force time histories to be used on experimental testing. Engineer Research and Development Center (U.S.), gennaio 2024. http://dx.doi.org/10.21079/11681/48080.

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Abstract (sommario):

The purpose of this study is to evaluate the dynamic response of fiber-reinforced polymer (FRP) composite sandwich panels subjected to typical barge impact masses and velocities to develop force time histories that can be used in controlled experimental testing. Dynamic analyses were performed on FRP composite sandwich panels using the finite element method software Abaqus/Explicit. The “traction-separation” law in the Abaqus software is used to define the cohesive surface interaction properties to evaluate the damage between FRP composite laminate layers as well as the core separation within the sandwich panels. Numerical models were developed to better under-stand the damage caused by barge impacts and the effects of impacts on the dynamic response of composite structures. Force, displacement, and velocity time histories were obtained with finite element modeling for several mass and velocity cases to develop experimental testing procedures for these types of structures.

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