Relevant bibliographies by topics / Sandwich structure

Academic literature on the topic 'Sandwich structure'

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Published: 4 June 2021
Last updated: 8 June 2024

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Journal articles on the topic "Sandwich structure"

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Krzyżak, Aneta, Michał Mazur, Mateusz Gajewski, Kazimierz Drozd, Andrzej Komorek, and Paweł Przybyłek. "Sandwich Structured Composites for Aeronautics: Methods of Manufacturing Affecting Some Mechanical Properties." International Journal of Aerospace Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/7816912.

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Sandwich panels are composites which consist of two thin laminate outer skins and lightweight (e.g., honeycomb) thick core structure. Owing to the core structure, such composites are distinguished by stiffness. Despite the thickness of the core, sandwich composites are light and have a relatively high flexural strength. These composites have a spatial structure, which affects good thermal insulator properties. Sandwich panels are used in aeronautics, road vehicles, ships, and civil engineering. The mechanical properties of these composites are directly dependent on the properties of sandwich components and method of manufacturing. The paper presents some aspects of technology and its influence on mechanical properties of sandwich structure polymer composites. The sandwiches described in the paper were made by three different methods: hand lay-up, press method, and autoclave use. The samples of sandwiches were tested for failure caused by impact load. Sandwiches prepared in the same way were used for structural analysis of adhesive layer between panels and core. The results of research showed that the method of manufacturing, more precisely the pressure while forming sandwich panels, influences some mechanical properties of sandwich structured polymer composites such as flexural strength, impact strength, and compressive strength.
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Lin, Zhengjie, Hengliang Liang, and Hongfei Zhou. "Forming pressure of PMI foam sandwich structure." Journal of Physics: Conference Series 2566, no. 1 (August 1, 2023): 012040. http://dx.doi.org/10.1088/1742-6596/2566/1/012040.

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Abstract In this study, the performance of A-reinforced sandwich structures made with polymethacrylimide (PMI) foam material is explored. The research focuses on comparing two forming methods, bonding and co-curing. It also tests the static properties of sandwich test pieces under different forming pressures. It reveals that the foam sandwich structure formed under the 0.15 MPa bonding process outperforms the rest regarding static properties. These findings provide valuable insights into the optimal structure-forming process for PMI foam sandwiches, paving the way for future advancements in this field.
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Hossain, Forhad, Md Arifuzzaman, Md Shariful Islam, and Md Mainul Islam. "Thermo-Mechanical Behavior of Green Sandwich Structures for Building and Construction Applications." Processes 11, no. 8 (August 15, 2023): 2456. http://dx.doi.org/10.3390/pr11082456.

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In this work, three different types of sandwich structures were manufactured, each using a Formica sheet (a paper-based sheet) as the skin and perlite/sodium silicate foam as the core, with or without a paper honeycomb. The sandwich structures were fabricated by attaching the Formica sheets on both sides of a paper honeycomb core panel, a perlite/sodium silicate foam core panel, and a perlite/sodium silicate foam-filled honeycomb core panel. The flexural characteristics were studied by a three-point bending test and the thermal conductivity was measured using Lee’s thermal conductivity apparatus. The results demonstrated a significant improvement in flexural properties, including core shear stress, facing stress, bending stress, and energy absorption, when incorporating the paper honeycomb reinforcement. The thermal conductivity and flexural properties of the paper honeycomb reinforced and unreinforced perlite/sodium silicate foam-based sandwich panels were found to be very compatible with existing building materials described in the literature that are used for similar applications. The failure investigation revealed that the sandwiches with paper honeycomb failed prematurely only due to core buckling, while the foam-filled honeycomb core-based sandwiches were able to sustain higher loads while exhibiting material failures such as core shear failure, skin rapture, and delamination. It was found that the foam-filled paper honeycomb sandwich structures can withstand higher bending loads than the foam core-based sandwich structure or the paper-honeycomb-based sandwich structure. These developed sandwiches offer potential as green materials due to the characteristics of their constituent materials and they can provide valuable applications in the thermal insulation of buildings.
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Kozak, Janusz. "Joints Of Steel Sandwich Structures." Polish Maritime Research 28, no. 2 (June 1, 2021): 128–35. http://dx.doi.org/10.2478/pomr-2021-0029.

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Abstract Steel sandwich structures are perceived as alternatives to single-skin welded structures in the shipbuilding industry due its advantages like significant reduction of mass in relation to typical single skin structure. However, beside problems with their strength properties itself, applications in real structures requires of solving the problem of joining, both for connection sandwich to sandwich as well as sandwiches to single-shell structures. Proper design of joints is connected with some factors like lack of attempt to interior of panel, introduction of additional parts and welds with completely different stiffness. In the paper the results of laboratory fatigue tests of selected joints as well as numerical calculation of stressed for different kind of joints of sandwich structures are presented. As result of calculations optimisation of geometry for selected joints is performed.
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Chang, Bianhong, Zhenning Wang, and Guangjian Bi. "Study on the Energy Absorption Characteristics of Different Composite Honeycomb Sandwich Structures under Impact Energy." Applied Sciences 14, no. 7 (March 27, 2024): 2832. http://dx.doi.org/10.3390/app14072832.

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A honeycomb structure is a sandwich structure widely used in fuselage, among which the hexagonal honeycomb core is the most widely used. The energy absorption characteristics and impedance ability of the structure are the main reasons that directly affect the energy absorption characteristics of the honeycomb sandwich structure. Therefore, it is necessary to study the out-of-plane mechanical properties of the composite honeycomb sandwich structure. Based on the numerical simulation results, the energy absorption characteristics of several composite honeycomb sandwich structures are verified by drop hammer impact experiments. The research shows that the transient energy absorption characteristics of the composite honeycomb sandwich structure are mainly related to the cell size of the honeycomb structure. The smaller the size of the front cell, the stronger the overall impact resistance; the strength of the composite honeycomb sandwich structure exceeds that of 7075 aluminum alloy-NOMEX and carbon fiber-NOMEX honeycomb sandwich structures. In this paper, the energy absorption characteristics of composite honeycomb sandwich structures under different impact energy are compared and studied. The displacement, force and energy curves of energy absorption characteristics related to time variables are analyzed. The difference in protective performance between the composite honeycomb sandwich structure and existing airframe structure is compared and studied. The optimal structural design parameters of composite honeycomb sandwich under low-speed impact of drop hammer are obtained. The maximum energy absorption per unit volume of the designed honeycomb sandwich structure is 171.7% and 229.8% higher than that of the NOMEX-AL and NOMEX-C structures. The 6.4 mm and 3 mm cell sizes show good characteristics in high-speed buffering and crashworthiness. The composite honeycomb sandwich airframe structure can improve the anti-damage performance of the UAV airframe structure, ensure the same thickness and lightweight conditions as the existing honeycomb sandwich airframe structure, and improve the single-core bearing mode of the existing airframe structure.
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Kausar, Ayesha, Ishaq Ahmad, Sobia A. Rakha, M. H. Eisa, and Abdoulaye Diallo. "State-Of-The-Art of Sandwich Composite Structures: Manufacturing—to—High Performance Applications." Journal of Composites Science 7, no. 3 (March 7, 2023): 102. http://dx.doi.org/10.3390/jcs7030102.

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This cutting-edge review highlights the fundamentals, design, and manufacturing strategies used for sandwich composites. Sandwich composite structures have the advantages of light weight, high strength, impact resistance, stability, and other superior features for advanced applications. In this regard, different core materials have been used in the sandwich composite structures, such as cellular polymer foam, metallic foam, honeycomb, balsa, tubular, and other core geometries. Among these, honeycomb sandwich composite materials have been effectively applied in space engineering, marine engineering, and construction applications. The foremost manufacturing techniques used for sandwiched composite structures include hand lay-up, press method, prepreg method, vacuum bagging/autoclave, vacuum assisted resin infusion, resin transfer molding, compression molding, pultrusion, three-dimensional (3D) printing, four-dimensional (4D) printing, etc. In advanced composite manufacturing, autoclave processes have been the method of choice for the aerospace industry due to less delamination between plies and easy control of thickness dimensions. Moreover, machining processes used for sandwich composites are discussed in this article. In addition to aerospace, the high-performance significance of sandwiched composite structures is covered mainly in relation to automobile engineering and energy absorption applications. The structure-, fabrication-, and application-related challenges and probable future research directions are also discussed in this article.
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Fu, Yibin, Jun Zhou, and Xiaosheng Gao. "Sandwiched hollow sphere structures: A study of ballistic impact behavior using numerical simulation." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 12 (December 12, 2013): 2068–78. http://dx.doi.org/10.1177/0954406213515857.

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Sandwiched hollow sphere structure may have the potential to provide better ballistic impact protection as compared with monolithic plate based on the same weight and impact area. In the previous study of a sandwiched hollow sphere structure by the authors, a novel unit cell was created as a basic building unit of the structure, the tumbling effect was observed for significant impact energy absorption, and the existence of an optimal yield stress or hardness was proved for maximizing the impact energy absorption. However, the impact energy absorption ability of the sandwiched hollow sphere structure may also relate to many other factors. In this study, the diameter relation between the incoming projectile and the spheres in the sandwich core, the projectile initial impact velocity, and the sphere arrangement in the sandwich core are examined. It is revealed that the first layer sphere diameter should be comparable to the diameter of the incoming projectile, the diameter of spheres in different layers in one sandwich core should either decrease or increase monotonically, and there exists a critical impacting speed, at which the sandwiched sphere structure is most effective for impact energy absorption, etc. All these findings make the sandwiched hollow sphere structure a promising new member to the passive armor family.
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Feng, Yixiong, Hao Qiu, Yicong Gao, Hao Zheng, and Jianrong Tan. "Creative design for sandwich structures: A review." International Journal of Advanced Robotic Systems 17, no. 3 (May 1, 2020): 172988142092132. http://dx.doi.org/10.1177/1729881420921327.

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Sandwich structures are important innovative multifunctional structures with the advantages of low density and high performance. Creative design for sandwich structures is a design process based on sandwich core structure evolution mechanisms, material design method, and panel (including core structure and facing sheets) performance prediction model. The review outlines recent research efforts on creative design for sandwich structures with different core constructions such as corrugated core, honeycomb core, foam core, truss core, and folded cores. The topics discussed in this review article include aspects of sandwich core structure design, material design, and mechanical properties, and panel performance and damage. In addition, examples of engineering applications of sandwich structures are discussed. Further research directions and potential applications are summarized.
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Zhang, Zhen, Jian Guang Zhang, Xiu Zhi Liu, Yong Hai Wen, and Shao Bo Gong. "Numerical and Experimental Studies of Composites Sandwich Structure with a Rectangular Cut-Out." Applied Mechanics and Materials 395-396 (September 2013): 891–96. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.891.

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Numerical and experimental study on honeycomb sandwich structure with a rectangular cut-out were carried out in this paper. Two designs were presented, with using a U-shaped sandwich structure or a combination of two separate sandwiches. Finite element models were developed and calculated using MSC.NASTRAN code by means of linear analysis and non-linear incremental deformation analysis. Compared with linear analysis, non-linear analysis was more suitable to evaluate the ability of sandwich structure with cut-out to resist compressive load. The results obtained from non-linear solution were verified by the supporting mechanical tests.
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Wang, Dong-Mei, and Rui Yang. "Investigation of vibration transmissibility for paper honeycomb sandwich structures with various moisture contents." Mechanics & Industry 20, no. 1 (2019): 108. http://dx.doi.org/10.1051/meca/2019002.

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Vibration transmissibility is an important factor to characterize the vibration absorption performance of cushioning packaging materials during transportation. Reasonable prediction of vibration transmissibility can guide antivibration design and reduce packaging cost. As a kind of green cushioning material, paper honeycomb sandwich structure is widely used in transport packaging because of its good machinability. But at the same time, it also has strong water absorption capacity. To a great extent, the vibration transmissibility of paper honeycomb sandwich structure may be affected by ambient humidity. In this research, the vibration transmissibility of paper honeycomb sandwich structures with various structure sizes under different humidity was tested by sine frequency sweep experiments. The rule of maximal vibration transmissibility with moisture content, cell length of honeycomb, and thickness of sandwich structure was analyzed. The results show that the maximal vibration transmissibility of paper honeycomb sandwich structure increases with the increase of moisture content, cell length of honeycomb, and thickness of sandwich structure. In order to construct the relationship between maximal vibration transmissibility and various factors, the moisture content was standardized. Finally, the maximal vibration transmissibility evaluation equation of paper honeycomb sandwich structure containing standardized moisture content and size of sandwich structure was obtained, which is of some reference value for vibration prediction of paper honeycomb sandwich structures.
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Dissertations / Theses on the topic "Sandwich structure"

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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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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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Sander, Tavallaey Shiva. "Wave propagation in sandwich structure." Doctoral thesis, KTH, Vehicle Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.

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Tran, Van Luan. "Etude du comportement hygro-thermo-mécanique d'un matériau composite sandwich avec âme balsa utilisé en applications navales." Nantes, 2013. http://www.theses.fr/2013NANT2001.

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Les matériaux composites sandwichs ont été largement adoptés dans le domaine naval car ils présentent des atouts de légèreté et de bonne résistance mécanique. Cependant, leur tenue à l'humidité en environnement marin est encore difficile à prédire et leur résistance au feu constitue l'une des limitations principales à leur utilisation dans un plus grand nombre de cas. Ce travail s'intéresse au comportement d'un composite sandwich à base de peaux en verre-polyester et d'une âme balsa. Le balsa, élément principal du matériau, peut absorber une très grande quantité d'eau ce qui peut alors affecter ses caractéristiques mécaniques. De plus, la présence d'humidité peut influer sur la tenue au feu du matériau. Aussi, afin de mettre en évidence la durabilité du matériau et la physique des phénomènes rencontrés, de nombreuses expériences ont été menées en conditions variées d'humidité, de température et de chargements mécaniques. En complément de résultats classiques obtenus sur le balsa, des essais de tenue au feu ont été associés à des essais de flexion du composite sandwich pour en estimer la résistance en fonction du temps de combustion. Enfin, à partir de résultats expérimentaux associés à la reprise en eau du balsa et du composite sandwich, des modélisations permettant de mieux comprendre et de prédire l'état mécanique de la structure sandwich ont été établis
Sandwich composite structures have been widely adopted in the naval field because they exhibit both lightness and good mechanical strength. However, their resistance to moisture in the marine environment is difficult to predict, and their fire resistance is one of the main limitations to their use in a greater number of cases. In this work, we focus on the behavior of a composite sandwich composed with glass-polyester skins and balsa core. Balsa, which is the main constituent, can absorb a large amount of water which may affect its mechanical properties. Moreover, the presence of moisture can influence the fire resistance of the material. Thus, in order to highlight the material durability and the physical phenomena encountered, several experiments were performed in miscellaneous conditions of humidity, temperature and mechanical loadings. In addition to classical results obtained on the balsa, testing of fire resistance combined with bending tests on sandwich composite materials were achieved to estimate the residual strength as a function of the combustion time. Finally, from experimental results related to the water uptake of balsa and of sandwich composite, modelling was computed to better understand and predict the mechanical state of the studied sandwich structure
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Hui, Yi. "Development and experimental validation of vibration based damage indicator on a specific twin-wall sandwich structure." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC032.

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La surveillance de santé structurale (SHM) a attiré beaucoup d'attention dans de nombreux domaines tels que l'industrie civile, aéronautique, mécanique, etc., car il est important de surveiller l'état de la structure afin d'éviter des défaillances structurelles imprévues. Le processus d'identification des endommagements à quatre niveaux: existence, localisation, sévérité et prédiction de l'évolution des endommagements peut être partiellement réalisé si un propre indicateur est bien choisi. Il existe différents indicateurs d'endommagements dont la gamme d'application de la fréquence s'étend de la réponse vibratoire à basses fréquences aux régimes ultrasoniques dans la gamme méga hertz.Les structures sandwich sont largement utilisées dans diverses applications d'ingénierie en raison de son rapport rigidité / poids exceptionnellement élevé par rapport aux structures monocoques. Dans ce travail, une structure sandwich a été étudiée et des indicateurs basés sur la réponse vibratoire ont été conçus en utilisant ses caractéristiques de directivité de propagation et d'amortissement relativement élevé de la structure. Des investigations numériques sur différents scénarios d'endommagement (càd, différents types d'endommagement et leurs combinaisons) et une discussion associée sur la plage d'application ont d'abord été effectuées. La configuration expérimentale a été facilement réalisée à l'aide d'un vibromètre laser à balayage Doppler (SLDV). L'endommagement a été détecté avec succès par les indicateurs proposés
Structural health monitoring (SHM) has attracted much attention in many engineering fields like civil, aeronautic, mechanical industry, etc. since it is important to monitor the healthy condition of the operational structure in order to avoid unpredicted structural failure which may have severe consequences. The four-level damage identification process: existence, localization, severity and prediction of damage evolution, can be partly realized if a suitable indicator is chosen. It exists different damage indicators whose application range of frequency spans from vibrational response at low frequencies to the ultrasonic regimes in the mega hertz range.The sandwich structures are widely used in various engineering applications due to its exceptionally high flexural stiffness-to-weight ratio compared to monocoque structures. In this thesis a specified twin-wall sandwich structure in polypropylene was studied and vibration-based indicators were designed by taking use of its relative high damping and propagation directivity characteristics. Numerical investigations on different damage scenarios (i.e., different types of defect and their combinations) and an associated discussion on the range of application were first carried out. Experimental configuration was easily realized with the help of a scanning laser doppler vibrometer (SLDV). Defect was successfully detected by the proposed indicators
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Zhang, Shufeng. "Thermomechanical interaction effects in polymer foam cored sandwich structure." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/351349/.

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Polymer foam cored sandwich structures are frequently exposed to elevated temperatures in the range of 50-100°C. Recent theoretical studies showed that elevated temperatures may shift the behaviour of sandwich structures from linear and stable to nonlinear and unstable. Although this prediction has not been experimentally validated, it has aroused concerns on the performance of sandwich structures at elevated temperatures. Thereby, a focused experimental study is required to confirm the thermomechanical interaction effects. The work described in this thesis provides experimental assessments on the thermomechanical interaction effects in polymer foam cored sandwich structures. As a starting point, a novel methodology is proposed to obtain the elastic properties of polymer foam materials at elevated temperatures based on digital image correlation (DIC). The tensile, compressive and shear properties were characterised at temperatures from room temperature to 90°C. It is identified that the thermal degradation of the elastic modulus of polymer foams only depends on the base polymer, regardless of the deformation type or foam density. A master curve is derived which shows the temperature dependence of the Young's and shear moduli of Divinycell H100, H130 and H200 foam. An experimental apparatus is constructed to allow sandwich beam specimens to be subjected to a bending load as well as a well-defined temperature gradient through the beam thickness. The bending deflection, inhomogeneous core shear deformation and the wavy deflection of face sheet at the onset of localised buckling/wrinkling are accurately characterised using DIC. High-speed imaging was also adopted to view the rapid evolution of the wrinkles. It was found that, at elevated temperatures, the core shear strain can be nonuniform through the core thickness and the failure mode can shift to wrinkling instability. Simple analytical models are also developed to predict the behaviour of sandwich beams with transverse temperature gradients and consequently core stiffness gradients. A modification of the classical sandwich beam theory is proposed to predict the stress/strain state, load-defection response and failure mechanism with respect to the core shear yielding and face sheet yielding/fracture. Another analytical model is developed to predict the critical wrinkling stress. Both of the two models agree well with the experiments. The work described in the thesis demonstrates that the stiffness and load carrying capability of polymer foam cored sandwich structures are deteriorated by elevated temperatures. The deterioration can be confidently predicted by the experimentally validated analytical models introduced in the thesis. The study thereby provides a significant step towards an improved understanding of thermomechanical interaction effects in polymer foam cored sandwich structures.
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Besse, Camille. "Development and optimization of a formable sandwich sheet." Phd thesis, Palaiseau, Ecole polytechnique, 2012. https://theses.hal.science/docs/00/69/12/46/PDF/These_Camille_Besse.pdf.

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Le comportement mécanique d'un nouveau type de tôle sandwich métallique apte à la mise en forme est étudié. La couche cœur est composée de deux tôles gaufrées, brasées entre elles. Contrairement aux panneaux sandwichs conventionnels, ce type de tôle sandwich peut être mis en forme par les techniques traditionnelles de travail des métaux. Dans un premier temps, la géométrie de la structure gaufrée est optimisée afin d'obtenir la couche cœur présentant un rapport raideur au cisaillement - densité relative maximal. L'étude se concentre ensuite sur le comportement plastique de la structure sandwich " optimale " à l'aide de simulations par éléments finis d'expériences multiaxiales. On propose un modèle phénoménologique faisant appel à une loi d'écoulement associée et à un modèle d'écrouissage isotrope avec distorsion. Les paramètres du modèle sont identifiés par une approche inverse à partir d'un essai de traction uniaxial et d'un essai de flexion 4 points. Finalement, des simulations de pliage en U sont réalisées, utilisant un modèle détaillé d'une part et un modèle coque d'autre part. Pour différents outils de mise en forme, un bon accord entre les simulations est observé, validant en partie le modèle phénoménologique proposé
This thesis investigates the mechanical behavior of a new type of formable all-metal bi-directionally corrugated sandwich sheet material. Unlike conventional flat sandwich panel materials, this type of sandwich sheet material can be formed into three-dimensional shapes using traditional sheet metal forming techniques. In a first step, the core structure geometry is optimized such as to offer the highest shear stiffness-to-weight ratio. The post yielding behavior of the "optimal" sandwich structure is investigated using finite elements simulations of multi-axial experiments. A phenomenological constitutive model is proposed using an associative flow rule and distortional hardening. An inverse procedure is outlined to describe the sandwich material model parameter identification based on uniaxial tension and four-point bending experiments. In addition, simulations of a draw bending experiment are performed using a detailed finite element model as a well as a computationally-efficient composite shell element model. Good agreement of both simulations is observed for different forming tool geometries which is seen as a partial validation of the proposed constitutive model
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Besse, Camille. "Development and optimization of a formable sandwich sheet." Phd thesis, Ecole Polytechnique X, 2012. http://tel.archives-ouvertes.fr/tel-00691246.

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Le comportement mécanique d'un nouveau type de tôle sandwich métallique apte à la mise en forme est étudié. La couche cœur est composée de deux tôles gaufrées, brasées entre elles. Contrairement aux panneaux sandwichs conventionnels, ce type de tôle sandwich peut être mis en forme par les techniques traditionnelles de travail des métaux. Dans un premier temps, la géométrie de la structure gaufrée est optimisée afin d'obtenir la couche cœur présentant un rapport raideur au cisaillement - densité relative maximal. L'étude se concentre ensuite sur le comportement plastique de la structure sandwich " optimale " à l'aide de simulations par éléments finis d'expériences multiaxiales. On propose un modèle phénoménologique faisant appel à une loi d'écoulement associée et à un modèle d'écrouissage isotrope avec distorsion. Les paramètres du modèle sont identifiés par une approche inverse à partir d'un essai de traction uniaxial et d'un essai de flexion 4 points. Finalement, des simulations de pliage en U sont réalisées, utilisant un modèle détaillé d'une part et un modèle coque d'autre part. Pour différents outils de mise en forme, un bon accord entre les simulations est observé, validant en partie le modèle phénoménologique proposé.
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Barré, Sébastien. "Optimisation d'une structure sandwich dans le cadre d'une utilisation structurelle ferroviaire." Compiègne, 1996. http://www.theses.fr/1996COMPD964.

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Vinhas, Bertolini Peter. "Modélisation des poutres sandwich elasto-piézo-électriques : élément fini raffiné." Paris, ENSAM, 2001. http://www.theses.fr/2001ENAM0001.

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Wilhelm, Arnaud. "Développement d’une méthodologie pour la compréhension du comportement et le dimensionnement d’un bouclier sandwich soumis à l’impact d’un oiseau." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0005/document.

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Durant le vol d'un aéronef, la collision avec un oiseau est un risque important que les autorités de certification imposent de prendre en compte. Dans le cas du choc sur pointe avant, la protection du fond pressurisé est assurée par un bouclier. La compréhension du comportement d'une telle structure sandwich sous impact est essentielle pour permettre l'amélioration des boucliers existants. Ces travaux ont pour buts de comprendre l'influence des différents paramètres de conception du bouclier sur son comportement et sur la protection de la cible, et de mettre en place une méthodologie pour réaliser une telle étude. Pour cela, un modèle éléments finis générique est créé pour être utilisé dans l'étude paramétrique. Une méthode de mesure de la déformée est proposée pour permettre la comparaison rapide d'un grand nombre de cas et la compréhension du comportement de chaque bouclier. Elle s'appuie sur la décomposition de la déformée en trois modes : Indentation, Flexion et Écrasement. Une étude de criblage est ensuite réalisée pour classer les paramètres de définition par ordre d'influence. L'étude paramétrique est réalisée sur les six paramètres les plus influents. Un plan d'expérience de type carré Latin est choisi et sept grandeurs différentes sont suivies. Le cadre des processus gaussiens est utilisé pour créer des modèles réduits, qui sont utilisés pour étudier l'évolution du comportement du bouclier sur l'ensemble du domaine à l'aide d'analyses de sensibilité. Les effets de chaque paramètre sont identifiés et expliqués. Enfin, une méthode pour l'utilisation de ces modèles réduits dans le cadre d'optimisations est proposée
During an aircraft flight, the possible collision with a bird is a major threat, and the certification authorities require to take ît into account. In the case of a nose strike, the pressurized bulkhead is protected by a shield. Understanding the behaviour under impact of such a sandwich structure is essential. This work has two main goals: understanding the design parameters influence on the shield behaviour, and propose a methodology to conduct this study. Firstly, a generic finite element model is created to be used in a parametric study. A tool to measure the shield deformation is proposed to make it possible to easily compare the behaviour of different shields and to help understanding the behaviour of a shield. This tool is based on the projection ofthe shield deformation on a basis comprising three modes: Indentation, Bendîng and Crushing. A screening study is then conducted to rank the design parameters with respect to their influence. A parametric study is then conducted on the six first parameters. A Latin hyper-square is used for the design of experiment and seven different quantifies are studied. The Gaussian processes framework is used to create surrogates models. Global sensitivity analyses are then conducted to study the variation of the shield behaviour in the whole design space. The effects of each parameterare measured and explained. Finally, a method to minimize the shield mass, using the surrogate models to enforce minimal target protection criteria, is presented
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Books on the topic "Sandwich structure"

1

Gibson, Lorna J. Cellular solids: Structure & properties. Oxford [Oxfordshire]: Pergamon Press, 1988.

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F, Ashby M., ed. Cellular solids: Structure and properties. 2nd ed. Cambridge: Cambridge University Press, 1997.

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The structure of the missionary call to the Sandwich Islands, 1790-1830: Sojourners among strangers. San Francisco: Mellen Research University Press, 1990.

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K, Hoffman Eric, and Langley Research Center, eds. Evaluation of the transient liquid phase (TLP) bonding process for Ti₃-Based honeycomb core sandwich structure. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1998.

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T, Andras Maria, Hepp Aloysius F, and United States. National Aeronautics and Space Administration., eds. Reactivity of [pi]-complexes of Ti, V, and Nb towards dithioacetic acid: Synthesis and structure of novel metal sulfur-containing complexes. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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T, Andras Maria, Hepp Aloysius F, and United States. National Aeronautics and Space Administration., eds. Reactivity of [pi]-complexes of Ti, V, and Nb towards dithioacetic acid: Synthesis and structure of novel metal sulfur-containing complexes. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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Thomsen, O. T., E. Bozhevolnaya, and A. Lyckegaard, eds. Sandwich Structures 7: Advancing with Sandwich Structures and Materials. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3848-8.

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Caprino, Giancarlo. Sandwich structures: Handbook. Padua: Il Prato, 1989.

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Ma, Wenguang, and Russell Elkin. Sandwich Structural Composites. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003035374.

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Vautrin, A., ed. Mechanics of Sandwich Structures. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-9091-4.

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Book chapters on the topic "Sandwich structure"

1

Gooch, Jan W. "Sandwich Structure." In Encyclopedic Dictionary of Polymers, 645. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10277.

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Ma, Wenguang, and Russell Elkin. "Sandwich Structure Design and Mechanical Property Analysis." In Sandwich Structural Composites, 253–93. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003035374-7.

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Zhou, Guohua. "Sandwich Composite Structure Modeling by Finite Element Method." In Sandwich Structural Composites, 295–332. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003035374-8.

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Kwon, Young W. "Fluid-Structure Interaction of Composite Structures." In Advances in Thick Section Composite and Sandwich Structures, 187–219. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-31065-3_7.

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Sen, Vikrant, and Shivdayal Patel. "Corrugated Sandwich Structure Modeling Under Low Velocity Impact." In Lecture Notes in Mechanical Engineering, 94–107. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9523-0_11.

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Yang, W., M. W. Allin, and C. J. Dehenau. "FE Modeling of Paperboard Material Using Sandwich Structure Method." In Shock & Vibration, Aircraft/Aerospace, and Energy Harvesting, Volume 9, 137–40. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15233-2_14.

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Kister, Alexander E. "Sequence Pattern for Supersecondary Structure of Sandwich-Like Proteins." In Methods in Molecular Biology, 313–27. New York, NY: Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9161-7_16.

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Böhm, M. C. "Band-Structure Properties of One-Dimensional Polydecker Sandwich Systems." In One-Dimensional Organometallic Materials, 119–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-93351-6_10.

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Allagui, Sami, Abderrahim El Mahi, Jean-luc Rebiere, Moez Beyaoui, Anas Bouguecha, and Mohamed Haddar. "Manufacturing of Sandwich Structure with Recycled Flax/Elium Skins." In Lecture Notes in Mechanical Engineering, 240–48. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-84958-0_26.

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Kumar, A., R. Ganesh Narayanan, and N. Muthu. "Friction Stir Spot Welding of Honeycomb Core Sandwich Structure." In Low Cost Manufacturing Technologies, 73–79. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8452-5_6.

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Conference papers on the topic "Sandwich structure"

1

Baron, William, W. Smith, and Gregory Czarnecki. "Damage tolerance of composite sandwich structure." In 36th Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-1324.

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Sheahen, Patrick, Ron Schmidt, Tom Holcombe, and Bill Baron. "Primary sandwich structure - A unitized approach." In 41st Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-1430.

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Denli, H., and Jian-Qiao Sun. "Advances in Sandwich Structural Optimization for Noise Transmission Reduction." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13377.

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The sandwich structures in aerospace industry experience high noise transmissions since they are often stiff and light, and have low damping. Optimization studies of sandwich structures for noise transmission are relatively fewer. Most optimization studies in composite sandwich community seek for high stiffness with minimal weight. Advanced sandwiches must meet not only stiffness to weight ratio demands, but also have improved acoustic transmission performance. This paper presents recent advances in optimization of sandwich structures for minimum sound transmission. The finite element models of sandwich beams and plates are presented in this paper. The acoustic radiation of the structure is computed by using the Rayleigh integral. Sensitivity plays an important role in optimization studies. Analytical expressions of sensitivity can improve computational efficiency dramatically and accuracy at the same time. The explicit sensitivity functions of power and natural frequencies with respect to design parameters are derived in this work. In the optimization studies, we have considered structural parameters that can influence the transverse propagation of sound from the sandwich to the acoustic medium. These parameters include core topology and coupling stiffiness between in- and out-of-plane strains. We also study the optimization of the structure with respect to the structural boundary conditions to minimize the sound transmission. Numerical examples of single tone and broadband applications are presented in the paper. The results show that significant reduction of sound transmission across sandwich structures can be obtained. Finally, it should be noted that the novel optimized sandwich structures can meet not only stiffness to weight ratio demands, but also have significantly improved acoustic performance.
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Walker, Thomas, Douglas Graesser, Stephen Ward, Joseph Floyd, Hamid Razi, and Vangelis Ploubis. "Damage Assessment for Composite Sandwich Structure." In 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-1596.

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ZHAO, BANGHUA, and WENBIN YU. "Multiscale Structural Analysis of Honeycomb Sandwich Structure Using Mechanics of Structure Genome." In American Society for Composites 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/asc2017/15171.

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Wan, Wenchao, Xiaobin Li, Li Jiang, and Pu Li. "Numerical Simulation of Dynamic Response of Foam Aluminum Sandwich Panel Under Impact Load." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18276.

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Abstract The impact resistance of protective structure directly affects the vitality of the ship. Since the excellent energy absorption characteristics and lightweight structural forms, foamed aluminum sandwich panels have gradually replaced stiffened panels and are widely used in local structures and components of vessels. In order to improve the protective ability of the ship structure, the impact resistance of the foam aluminum sandwich panel is studied in this paper. The deformation mechanism of the foam aluminum sandwich panel under the impact of the foam aluminum projectile is simulated by the finite element analysis, and the effect of different core thickness and core strength on the dynamic response of the sandwich panel is studied. An optimized structural form is proposed for the shear failure of foam aluminum sandwich panels. The results show that the optimized structure improves the impact resistance of foam aluminum sandwich panel and the shear resistance of the intermediate core layer. The research of this paper provides reference for the optimization of foam metal sandwich structure and its application in ship protection structure.
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Herup, Eric, and Anthony Palazotto. "Low-velocity impact damage initiation in graphite-epoxy/nomex honeycomb sandwich plates." In 37th Structure, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1519.

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Hála, Petr, Přemysl Kheml, Alexandre Perrot, Jiří Mašek, and Radoslav Sovják. "Lightweight Protective Sandwich Structure with UHPC Core." In Third International Interactive Symposium on Ultra-High Performance Concrete. Iowa State University Digital Press, 2023. http://dx.doi.org/10.21838/uhpc.16647.

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Pietrikova, Alena, Tomas Lenger, Lubomir Livovsky, Igor Vehec, and Peter Lukacs. "Moisture Absorption of Glass-Epoxy Sandwich Structure." In 2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika). IEEE, 2022. http://dx.doi.org/10.1109/diagnostika55131.2022.9905216.

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Minguet, Pierre, and T. O'Brien. "Failure mechanisms around the interface between a sandwich skin and a bonded frame." In 37th Structure, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1353.

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Reports on the topic "Sandwich structure"

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Jones, Gregory R. Titanium Sandwich Airframe Structure. Volume 1: Program Overview. Fort Belvoir, VA: Defense Technical Information Center, March 2011. http://dx.doi.org/10.21236/ada552062.

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Kosny, Jan, and X. Sharon Huo. Structural Analysis of Sandwich Foam Panels. Office of Scientific and Technical Information (OSTI), April 2010. http://dx.doi.org/10.2172/979348.

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Perez-Rivera, Anthony, Jonathan Trovillion, Peter Stynoski, and 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.), January 2024. http://dx.doi.org/10.21079/11681/48080.

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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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Horvath, J. Gravity sag of sandwich panel assemblies as applied to precision cathode strip chamber structural design. Office of Scientific and Technical Information (OSTI), September 1993. http://dx.doi.org/10.2172/10117759.

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Petrova, Katerina. On the Validity of Classical and Bayesian DSGE-Based Inference. Federal Reserve Bank of New York, January 2024. http://dx.doi.org/10.59576/sr.1084.

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This paper studies large sample classical and Bayesian inference in a prototypical linear DSGE model and demonstrates that inference on the structural parameters based on a Gaussian likelihood is unaffected by departures from Gaussianity of the structural shocks. This surprising result is due to a cancellation in the asymptotic variance resulting into a generalized information equality for the block corresponding to the structural parameters. The underlying reason for the cancellation is the certainty equivalence property of the linear rational expectation model. The main implication of this result is that classical and Bayesian Gaussian inference achieve a semi-parametric efficiency bound and there is no need for a “sandwich-form” correction of the asymptotic variance of the structural parameters. Consequently, MLE-based confidence intervals and Bayesian credible sets of the deep parameters based on a Gaussian likelihood have correct asymptotic coverage even when the structural shocks are non-Gaussian. On the other hand, inference on the reduced-form parameters characterizing the volatility of the shocks is invalid whenever the structural shocks have a non-Gaussian density and the paper proposes a simple Metropolis-within-Gibbs algorithm that achieves correct large sample inference for the volatility parameters.
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Scully, John R. Corrosion Mechanisms in Brazed Al-Base Alloy Sandwich Structures as a Function of Braze Alloy and Process Variables. Fort Belvoir, VA: Defense Technical Information Center, February 2013. http://dx.doi.org/10.21236/ada579023.

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STUDY ON FLEXURAL CAPACITY OF PROFILED STEEL SHEET - POLYURETHANE SANDWICH SLABS. The Hong Kong Institute of Steel Construction, March 2024. http://dx.doi.org/10.18057/ijasc.2024.20.1.6.

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Widely employed in enveloped structures, the metal-faced sandwich panel boasts thermal insulation, noise abatement, lightweight, and remarkable assembly efficiency. In this paper, a new type of profiled steel sheet and polyurethane sandwich slab (PSSPSS) was proposed. Through static load tests and numerical simulations, the flexural properties of the PSSPSS were studied, and the influence of individual geometric parameters on the flexural capacity of the structure was evaluated. The results of this analysis led to the derivation of the calculation formulas for the deflection and flexural bearing capacity of the PSSPSS. These results demonstrate that the bearing capacity and failure mode of the structure, as determined by test and simulation, are in perfect agreement. The sandwich slab’s failure is mainly demonstrated by an overabundance of deflection, with the peak being 1/42 of the span, and the channel steel at the middle span being distorted and snapped. The slab deflection calculation formula’s results, when compared to the test results, demonstrate a mere 2.1% error, thus confirming its accuracy. The slab thickness, profiled steel sheet thickness, polyurethane foam density, and slab span all contribute to higher bearing capacity and improved stiffness in the structure, yet the effect of the slab span is more evident. The slab span, however, has a more profound effect on stiffness. The flexural bearing capacity formula’s applicability is indicated by the maximum error being within 10%, as demonstrated by the comparison of the formula’s results with the FEA results for the sandwich slab with varying parameters.
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LOCAL BUCKLING (WRINKLING) OF PROFILED METAL-FACED INSULATING SANDWICH PANELS – A PARAMETRIC STUDY. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.248.

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This study aims to investigate the effects of various parameters including the height of the profiling region, spacing of profiling ribs, length of the panel, thickness and modulus of the foam core, and thickness of the profiled face sheet, on the local buckling capacity of profiled metal faced insulating sandwich panels. A simplified finite element (FE) modeling approach that models the profiled face sheet as a folded plate structure resting on elastic foundation is adopted. This modeling approach was validated through comparison with tests results and 3D FE modeling of the entire sandwich structure in a previous study conducted by the authors. The two-parameter elastic foundation properties are determined using a modified nonlinear Vlasov foundation model. The results show that all the above-mentioned parameters play important roles in controlling the buckling capacity of the panel. However, the slenderness ratio of the panel is the most dominant parameter among all. Understanding the influence of each of the aforementioned parameters aids in the design process of such panels and provides insight into their local buckling response.
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NUMERICAL STUDY ON SHEAR BEHAVIOUR OF ENHANCED C-CHANNELS IN STEEL-UHPC-STEEL SANDWICH STRUCTURES. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.4.

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This paper firstly developed a three-dimensional (3D) finite element model (FEM) for enhanced C-channels (ECs) in steel-UHPC-steel sandwich structures (SUSSSs). The FEM was validated by 12 push-out tests on ECs with UHPC. With the validated FEM, this paper performed in-depth parametric studies on shear behaviours of ECs with ultra-high performance concrete (UHPC). These investigated parameters included bolt-hole gap (a), grade (M) and diameter (d) of bolt, core strength (fc), length of C-channel (Lc), and prestressing force ratio on bolt (ρ) in ECs. Under shear forces, the ECs in UHPC exhibited successive fractures of bolts and C-channels. Increasing the bolt-hole gap within 0-2 mm has no harm on the ultimate shear resistance, but greatly improves the slip capacity of ECs. Increasing grade and diameter of bolts improves the shear resistance and ductility of ECs through increasing the PB/PC (shear strength of bolt to that of C-channel) ratio. Increasing the core strength increased the shear resistance, but reduced the ductility of ECs due to the reduced PB/PC ratio. The ECs with Lc value of 50 mm offer the best ductility. Prestressing force acting on the bolts reduced the shear strength and ductility of ECs with UHPC. Analytical models were proposed to estimate the ultimate shear resistance and shear-slip behaviours of ECs with UHPC. The extensive validations of these models against 12 tests and 31 FEM analysis cases proved their reasonable evaluations on shear behaviours of ECs with UHPC.
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