Articles de revues : « Corrugated core »

1

Zurnaci, E., H. Gokkaya, M. Nalbant et G. Sur. « Three-Point Bending Response of Corrugated Core Metallic Sandwich Panels Having Different Core Configurations – An Experimental Study ». Engineering, Technology & ; Applied Science Research 9, n^o 2 (10 avril 2019) : 3981–84. http://dx.doi.org/10.48084/etasr.2671.

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Bending response of corrugated core metallic sandwich panels was studied experimentally under three-point bending loading. Two different core configurations were used: the corrugated monolithic core and the corrugated sliced core. The trapezoidal corrugated cores were manufactured from aluminum sheets via a sheet metal bending mould. After the sandwich panel samples were prepared, they were subjected to three-point bending tests. The load and displacement responses of the sandwich panels having different core configurations were obtained from the experimental testing. The influence of the core configuration on the three-point bending response and failure modes was then investigated. The experimental results revealed that the corrugated sliced core configuration exhibited an improved bending performance compared to the corrugated monolithic core configuration.

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Zhang, Yan Chang, Shi Lian Zhang et Zi Li Wang. « Crush Behavior of Corrugated Cores Sandwich Panels ». Advanced Materials Research 217-218 (mars 2011) : 1584–89. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.1584.

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The out-of-plane quasi-static compressive behavior of four types of corrugated cores (V-type, U-type, X-type and Y-type core) has been investigated by experiment and FE simulations. By transient dynamic finite element analysis code MSC.Dytran numerical simulations were performed for calculating crushing forces, deformation mode and energy absorption. The FE simulations predict the crush behavior of cores with reasonable accuracy and provide the whole progressive buckling process and deformation modes. Experiment and simulation indicate that the U-type core, V-type core and X-type core structures show excellent crushing resistance performance and energy absorption characteristic. The crush performance of the Y-type core structures is relatively poor because of bending mode.

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Li, Xin, Shiqiang Li, Zhihua Wang, Jinglei Yang et Guiying Wu. « Response of aluminum corrugated sandwich panels under foam projectile impact – Experiment and numerical simulation ». Journal of Sandwich Structures & ; Materials 19, n^o 5 (6 février 2016) : 595–615. http://dx.doi.org/10.1177/1099636216630503.

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The paper studied the dynamic response of square aluminum corrugated sandwich panels under projectile impact. The aluminum foam projectile was utilized to apply the impulse on the sandwich panels. In order to increase the applied impulse under controlled impact velocity ( V < 200 m/s), a cylindrical Nylon mass was adhered to the back of foam projectile. Corrugated sandwich panels with two different configurations were tested and their typical deformation modes were obtained in the experiment. Based on the experiment, corresponding numerical simulations were presented. The energy absorption and deformation mechanism of corrugated sandwich panels were studied through the simulation. The influence of impact velocity, thickness of face sheet and wall thickness of corrugated core were discussed. The results indicated that the corrugated sandwich panels with smaller core height produce larger deformation than the panels with larger core height. The face sheets of corrugated sandwich panel absorbed comparable amount of energy with the corrugated core. The velocity histories show that under the combined action of aluminum foam projectile and nylon back mass, a second peak velocity of front face sheet can be produced during the impact process, which is defined as “accelerating impact stage” in current study. The influence of “accelerating impact stage” to the response of structures is sensitive to the impact velocity.

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Kooistra, Gregory W., Vikram Deshpande et Haydn N. G. Wadley. « Hierarchical Corrugated Core Sandwich Panel Concepts ». Journal of Applied Mechanics 74, n^o 2 (20 septembre 2005) : 259–68. http://dx.doi.org/10.1115/1.2198243.

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The transverse compression and shear collapse mechanisms of a second order, hierarchical corrugated truss structure have been analyzed. The two competing collapse modes of a first order corrugated truss are elastic buckling or plastic yielding of the truss members. In second order trusses, elastic buckling and yielding of the larger and smaller struts, shear buckling of the larger struts, and wrinkling of the face sheets of the larger struts have been identified as the six competing modes of failure. Analytical expressions for the compressive and shear collapse strengths in each of these modes are derived and used to construct collapse mechanism maps for second order trusses. The maps are useful for selecting the geometries of second order trusses that maximize the collapse strength for a given mass. The optimization reveals that second order trusses made from structural alloys have significantly higher compressive and shear collapse strengths than their equivalent mass first order counterparts for relative densities less than about 5%. A simple sheet metal folding and dip brazing method of fabrication has been used to manufacture a prototype second order truss with a relative density of about 2%. The experimental investigation confirmed the analytical strength predictions of the second order truss, and demonstrate that its strength is about ten times greater than that of a first order truss of the same relative density.

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Buannic, Natacha, Patrice Cartraud et Tanguy Quesnel. « Homogenization of corrugated core sandwich panels ». Composite Structures 59, n^o 3 (février 2003) : 299–312. http://dx.doi.org/10.1016/s0263-8223(02)00246-5.

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Abada, Mahmoud, et Ahmed Ibrahim. « Metallic Ribbon-Core Sandwich Panels Subjected to Air Blast Loading ». Applied Sciences 10, n^o 13 (29 juin 2020) : 4500. http://dx.doi.org/10.3390/app10134500.

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Sandwich structures provide a quite promising solution for blast alleviation techniques owing to their lightweight, high strength, and impressive energy absorption capabilities relative to solo metallic plates with equivalent density. The ability of the sandwich structure to withstand blast loading relies on its core topology. This paper numerically investigates the effectiveness of using ribbon shapes as an innovative core topology for sandwich structures subjected to blast loading. The hydro-code program (Autodyn) supported by the finite element program (ANSYS) is adopted to study the dynamic response of various sandwich panels. The accuracy of the finite element (FE) models were verified using available experimental results for a field blast test in the literature. The results show that the developed finite element model can be reliably exploited to simulate the dynamic behavior of the sandwich panels. The trapezoidal (TZ) and triangular (T) corrugated core topologies were selected to highlight the blast-resistant performance of the new ribbon core topology. Applying the ribbon topology to the traditional corrugated core topologies improved their blast performance. The facing front-plate’s deflection of the trapezoidal corrugated ribbon core sandwich structure (TZRC) has been improved by 45.3% and by 76.5% for the back-plate’s deflection, while for the triangular ribbon corrugated core (TRC), the front plate’s defection has been enhanced by 69.3% and by 112.1% for the back plate. The effect of various design parameters on the blast behavior of the Ribbon-Core Sandwich Panels (RCSPs) was investigated. A parametric study was conducted to evaluate performance indicators, including energy dissipated through plastic deformation and plate deflections. Finally, based on the parametric study, the results of this paper were recommended to be used as a guide for designing metallic ribbon sandwich structures with different protection levels.

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Zou, Guang Ping, Peng Fei Yang, Jie Lu et Yong Gui Li. « The Debond Fracture of Sandwich Plate with Corrugated Core Using Cohesive Zone Element ». Key Engineering Materials 525-526 (novembre 2012) : 117–20. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.117.

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In this paper, flatwise tensile test (FWT) and modified double cantilever beam (DCB) experiment were conducted to investigated the debond fracture of sandwich plate with corrugated core. In the experiment, the crack always stays at the face/core interfacial. Tensile bond strength of face core can be given from the flatwise tensile test and we can get the mode I fracture toughness GIC from DCB tests. It is found that the trends of curves change greatly at the beginning, with the propagation of crack, load against open displacement curves change smoothly. In order to simulate the face/core failure of sandwich plate with corrugated core, the cohesive element model is used. Tensile strength and strain energy release rate measured by the experiments presented in this paper are used in as parameters for simulation of the debond fracture. By comparing with the experiment results, the model can express the face/core failure of sandwich plate with corrugated core validly.

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Elzayady, Nagwa, et Eltahry Elghandour. « Compression Capacity of Corrugated Core Hybrid Composite Sandwich Structure ». Key Engineering Materials 821 (septembre 2019) : 47–53. http://dx.doi.org/10.4028/www.scientific.net/kem.821.47.

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Improvement of mechanical properties of light-weight corrugated core sandwich structures is a big demand in aerospace applications. Among these applications, space vehicles which encounter pressure loads and severe aerodynamic heating during ascent and reentry. The open-cell corrugated core is useful for active cooling of the sandwich structures. In this work, hybrid composite structural members with fiberglass corrugated core and carbon fiber skin facings were manufactured using vacuum bag technique. Different specimen configurations with rectangular cross-section area have been subjected to the load in the longitudinal direction of the corrugation and examined by edgewise compression test. The proposed testing has been applied to take advantage of the highest inertia of the specimen in such orientation. The test provides a basis for estimating the load carrying capacity when these structure members are used as individual webs in the aircraft interiors. Also as the core sheet is turned by 90° to the regular load direction, this structure member is similar to the so-called honeycomb when ordered in parallel rows and hence it is appropriate for floor sandwiching. In contrary to a honeycomb, this core consists of fiberglass laminate and therefore higher compressive resistance is associated. The results exhibit high values of both stiffness and ultimate compression force in the corrugation direction. For the rectangular area and the open corrugated contour, specific properties relative to the weight are extremely high. Also, the results and graphs indicate that there must be at least three corrugated ligaments with a trapezoidal cross section of 0.5” height and 63o per cell to grantee stability under load and high absorbed energy in the non-linear stage as well.

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Zhang, Jian-Xun, Yang Ye, Qing-Hua Qin et T. J. Wang. « Dynamic Compressive Response of Sinusoidal Corrugated Core Sandwich Plates ». International Journal of Applied Mechanics 10, n^o 07 (août 2018) : 1850075. http://dx.doi.org/10.1142/s1758825118500758.

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In this paper, the dynamic compressive response of metal sinusoidal corrugated core sandwich plates is investigated. The analytical model for the reaction forces of top and bottom face sheets subjected to constant velocity are developed. Finite element (FE) method is carried out to predict the dynamic collapse of metal sinusoidal corrugated cores. Several collapse modes of cores are found in terms of different impact velocity and relative core density. The analytical predications are compared with numerical results, and the analytical model captures numerical results for reaction forces reasonably. The collapse mechanism maps are constructed for sinusoidal corrugated cores with elastic-perfectly plastic material and strain hardening plastic material. The effect of strain rate sensitive on the collapse response is discussed. It is demonstrated that the strain hardening of the metal material increases the dominant deformation mode of the collapse mechanism maps.

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Magnucka-Blandzi, E., P. Paczos, P. Wasilewicz et A. Wypych. « Three-Point Bending of Seven Layer Beams – Theoretical and Experimental Studies ». Archives of Civil Engineering 62, n^o 2 (1 juin 2016) : 115–33. http://dx.doi.org/10.1515/ace-2015-0069.

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Abstract The subject of the analytical and experimental studies therein is of two metal seven-layer beam - plate bands. The first beam - plate band is composed of a lengthwise trapezoidally corrugated main core and two crosswise trapezoidally corrugated cores of faces. The second beam - plate band is composed of a crosswise trapezoidally corrugated main core and two lengthwise trapezoidally corrugated cores of faces. The hypotheses of deformation of a normal to the middle surface of the beams after bending are formulated. Equations of equilibrium are derived based on the theorem of minimum total potential energy. Three-point bending of the simply supported beams is theoretically and experimentally studied. The deflections of the two beams are determined with two methods, compared and presented.

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Sauret, Alban, Alberto Fernandez-Nieves, Howard A. Stone et David A. Weitz. « Corrugated interfaces in multiphase core-annular flow ». Physics of Fluids 22, n^o 8 (août 2010) : 082002. http://dx.doi.org/10.1063/1.3480561.

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Chang, Wan-Shu, Edward Ventsel, Ted Krauthammer et Joby John. « Bending behavior of corrugated-core sandwich plates ». Composite Structures 70, n^o 1 (août 2005) : 81–89. http://dx.doi.org/10.1016/j.compstruct.2004.08.014.

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Isaksson, P., A. Krusper et P. A. Gradin. « Shear correction factors for corrugated core structures ». Composite Structures 80, n^o 1 (septembre 2007) : 123–30. http://dx.doi.org/10.1016/j.compstruct.2006.04.066.

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Qin, Qing Hua, Jian Xun Zhang, T. Wang, Zheng Jin Wang et Tie Jun Wang. « Resistance of Metal Sandwich Plates with Polymer Foam-Filled Core to Localized Impulse ». Key Engineering Materials 535-536 (janvier 2013) : 534–38. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.534.

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This work examines the resistance of metal sandwich plates with corrugated core subjected to impulsive loading over central patch, in which effects of the low-density polymeric foam filling the interstices of the corrugated core on dynamic response of sandwich plate are studied to ascertain the enhancement of sandwich plate under impulsive loading. The face sheets and corrugated core are made of the same metal materials. The resistance of the metal sandwich plates with foam-filled cores is compared to that of the metal sandwich plates with unfilled core with the same weight. The results of comparison show that the foam-filled core does not make the overall deflection decrease compared with empty core, but it can make the sandwich plate achieve multifunctional advantages. The membrane method is employed to predict large deflection response of metal sandwich plates with foam-filled and unfilled cores under impulsive loading over a central patch. The theoretical predictions agree well with FE results of sandwich plates with foam-filled and empty cores.

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Wei, Z., F. W. Zok et A. G. Evans. « Design of Sandwich Panels With Prismatic Cores ». Journal of Engineering Materials and Technology 128, n^o 2 (2 novembre 2005) : 186–92. http://dx.doi.org/10.1115/1.2172279.

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The paper focuses on optimization of lightweight sandwich panels with prismatic cores subject to bending loads in the two principal in-plane directions. Comparisons are made with optimal designs of panels with corrugated cores: a limiting case. When optimized for loading transverse to the prism axis, prismatic panels outperform those with corrugated cores, especially at lower loads. In contrast, when optimized for longitudinal loading, the corrugated core panel is always superior. Both panels exhibit significant anisotropy: a deficiency mediated by optimizing jointly for both orientations. The designs emerging from joint optimizations have only slightly lower load capacity than those optimized singly, but with the benefit of equal strengths in the two principal directions. Moreover, jointly optimized corrugated and prismatic panels perform equally well. Both are competitive with honeycomb core panels, especially at high load capacities. With the additional potential for multifunctionality (notably active cooling), the corrugated panels appear to be particularly promising thermostructural elements.

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SHILI, GUAN, LIANG YOUZHEN, WANG JUN, LU LIXIN et HOU XUE. « MODELLING FOR SINGLE-WALL CORRUGATED FIBREBOARD WITH A TRAPEZOIDAL CORE UNDER THE QUASI-STATIC EDGEWISE CRUSHING LOAD ». WOOD RESEARCH 67(6) 2022 67, n^o 6 (13 décembre 2022) : 979–93. http://dx.doi.org/10.37763/wr.1336-4561/67.6.979993.

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In this paper, the energy absorption of single-wall corrugated fibreboard with a trapezoidal core under edgewise crushing load was studied experimentally and analytically, and a physical surfacebonding was assumed to represent the interaction between the fluted board and thelinerboard based on the production process of corrugated fibreboards. Anew folding element was proposed, including two boards and two trapezoidal corrugated cores with central symmetry. Moreover, three folding modes of the fluted board were proposed based on experimental phenomena, and a plateau stress model was characterized by the geometry parameters of the corrugated fibreboard. It was found that the plateaustress predicted by thedeveloped model compared well with the experimental results, from which one can conclude that the proposed model was effective and helpful for corrugated structures design and parameters selection to meet different strength requirements.

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Le, Vinh Tung, et Nam Seo Goo. « Thermomechanical Performance of Bio-Inspired Corrugated-Core Sandwich Structure for a Thermal Protection System Panel ». Applied Sciences 9, n^o 24 (16 décembre 2019) : 5541. http://dx.doi.org/10.3390/app9245541.

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A skin structure for thermal protection is one of the most interesting components that needs to be considered in the design of a hypersonic vehicle. The thermal protection structure, if a dense structure is used, is heavy and has a large heat conduction path. Thus, a lightweight, high strength structure is preferable. Currently, for designing a lightweight structure with high strength, natural materials are of great interest for achieving low density, high strength, and toughness. This paper presents bio-inspired lightweight structures that ensure high strength for a thermal protection system (TPS). A sinusoidal shape inspired by the microstructure of the dactyl club of Odontodactylus scyllarus, known as the peacock mantis shrimp, is presented with two different geometries, a unidirectionally corrugated core sandwich structure (UCS) and a bidirectionally corrugated core sandwich structure (BCS). Thermomechanical analysis of the two corrugated core structures is performed under simulated aerodynamic heating, and the total deflection and thermal stress are presented. The maximum deflection of the present sandwich structure throughout a mission flight was 1.74 mm for the UCS and 2.04 mm for the BCS. Compared with the dense structure used for the skin structure of the TPS, the bio-inspired corrugated core sandwich structures achieved about a 65% weight reduction, while the deflections still satisfied the limits for delaying the hypersonic boundary layer transition. Moreover, we first fabricated the BCS to test the thermomechanical behaviors under a thermal load. Finally, we examined the influence of the core thickness, face-sheet thickness, and emittance in the simulation model to identify appropriate structural parameters in the TPS optimization. The present corrugated core sandwich structures could be employed as a skin structure for metallic TPS panels instead of the honeycomb sandwich structure.

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Lee, Woo Geun, Jung Seok Kim et Jae-Yong Lim. « Equivalent core concept for large-scale structural-level applications ». Journal of Sandwich Structures & ; Materials 21, n^o 4 (18 juillet 2017) : 1595–616. http://dx.doi.org/10.1177/1099636217720252.

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This study examined the applicability of the equivalent core concept, which replaces a discrete core with a homogenized solid core representing its elastic properties, on a large-scale structure. To this end, numerical verifications were performed for corrugated core structures at two levels, the specimen level and structural level. Before the verifications, analytical equations were gathered from previous reports to obtain the homogenized elastic properties of corrugated cores. At the specimen-level verifications, the maximum deflections of the corrugated core panel specimens subject to three-point bending were calculated with sandwich beam theory, finite element models with discretely modeled cores and equivalent cores. For the structural-level verifications, the maximum deflection and natural frequency were computed from a discrete finite element model and an equivalent model of a railway car body structure. The results revealed that the equivalent models gave excellent agreement with the theoretical values if the same underlying boundary conditions were used; however, greater discrepancies were observed with the discrete models. In addition, for the structural-level verifications the equivalent core model reasonably approximated the discrete model with marginal accuracy. Therefore, employing the equivalent core concept can be expected to save computational costs in the initial design stage of large-scale structures.

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Skrna-Jakl, Isabella C., Dieter H. Pahr, Karl Heinz Karner et Franz G. Rammerstorfer. « Homogenization Technique for the Efficient Modeling of Large Scale Corrugated Core Sandwich Structures ». International Journal of Applied Physics and Mathematics 4, n^o 1 (2014) : 62–67. http://dx.doi.org/10.7763/ijapm.2014.v4.256.

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Chen, Lin, Xiao Zhong Xie, Zhuo Li et Ye Qing Jin. « Research on Crushing Performance of Sandwich Panel with V-Type Corrugated Core under Shock Load ». Advanced Materials Research 694-697 (mai 2013) : 216–20. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.216.

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Sandwich panels with a V-type corrugated core are developed to investigate their crushing performance under lateral load based on the numerical method. The validity and feasibility of the calculation method is qualified by comparing numerical results with experiment results. Based on that, finite element software is applied to analyze the effects of structural parameters on the crushing performance of sandwich structure. Then inspecific energy increases as the core thickness and inclination angle are increased, but it will induce as the core height is raised. Additionally, the average crushing strength is increased with the increasing thickness, but it will decrease as the core height and inclination angle are raised. The results of this research may help the practical design and optimization of sandwich panel with corrugated core.

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He, Li, Yuan-Sheng Cheng et Jun Liu. « Precise bending stress analysis of corrugated-core, honeycomb-core and X-core sandwich panels ». Composite Structures 94, n^o 5 (avril 2012) : 1656–68. http://dx.doi.org/10.1016/j.compstruct.2011.12.033.

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Mohammadabadi, Mostafa, Vikram Yadama et James Daniel Dolan. « Evaluation of Wood Composite Sandwich Panels as a Promising Renewable Building Material ». Materials 14, n^o 8 (20 avril 2021) : 2083. http://dx.doi.org/10.3390/ma14082083.

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During this study, full-size wood composite sandwich panels, 1.2 m by 2.4 m (4 ft by 8 ft), with a biaxial corrugated core were evaluated as a building construction material. Considering the applications of this new building material, including roof, floor, and wall paneling, sandwich panels with one and two corrugated core(s) were fabricated and experimentally evaluated. Since primary loads applied on these sandwich panels during their service life are live load, snow load, wind, and gravity loads, their bending and compression behavior were investigated. To improve the thermal characteristics, the cavities within the sandwich panels created by the corrugated geometry of the core were filled with a closed-cell foam. The R-values of the sandwich panels were measured to evaluate their energy performance. Comparison of the weight indicated that fabrication of a corrugated panel needs 74% less strands and, as a result, less resin compared to a strand-based composite panel, such as oriented strand board (OSB), of the same size and same density. Bending results revealed that one-layer core sandwich panels with floor applications under a 4.79 kPa (100 psf) bending load are able to meet the smallest deflection limit of L/360 when the span length (L) is 137.16 cm (54 in) or less. The ultimate capacity of two-layered core sandwich panels as a wall member was 94% and 158% higher than the traditional walls with studs under bending and axial compressive loads, respectively. Two-layered core sandwich panels also showed a higher ultimate capacity compared to structural insulated panels (SIP), at 470% and 235% more in bending and axial compression, respectively. Furthermore, normalized R-values, the thermal resistance, of these sandwich panels, even with the presence of thermal bridging due to the core geometry, was about 114% and 109% higher than plywood and oriented strand board, respectively.

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Jokelainen, Tero, Antti Järvenpää, Markku Keskitalo, Mikko Hietala, Aappo Mustakangas et Kari Mäntyjärvi. « Buckling Tests for Laser-Welded Single Corrugated Core ». Key Engineering Materials 786 (octobre 2018) : 269–75. http://dx.doi.org/10.4028/www.scientific.net/kem.786.269.

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This study was employed to investigate the buckling effect for a single Vf corrugated core. Brief and simple designing method is developed for UHS sandwich structure. This method is based on simplified calculation of slenderness ratio integrated with FEM simulation. Method is developed for studying the local buckling resistance of sandwich structures to optimize the panel dimensions for maximal stiffness. Five different core dimensions were tested (angles of 110-135 ° and height of 35 - 55 mm). Buckling tests were made using two different steel grades; ultra-high-strength (UHS) ARS400 and DC01 mild steel. For comparison, FEM simulations were carried out for the ARS400. The results showed that even 600% higher bending resistance can be achieved for the panel structure using the ultra-high strength steel instead of the low strength counterpart. The comparison showed that the FEM-simulations can be used reliably estimating the buckling effects in UHS panel structures. The difference between the empirical and simulation results was 5.3% in average (S.D. 4.1). In practical tests, best angle and height for the ARS400 was 110 ° and 35 mm respectively. For the DC01, the best dimensions were 125 ° and 35 mm.

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Zaid, N. Z. M., M. R. M. Rejab et N. A. N. Mohamed. « Sandwich Structure Based On Corrugated-Core : A Review ». MATEC Web of Conferences 74 (2016) : 00029. http://dx.doi.org/10.1051/matecconf/20167400029.

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Chang, Wan-Shu, T. Krauthammer et E. Ventsel. « Elasto-Plastic Analysis of Corrugated-Core Sandwich Plates ». Mechanics of Advanced Materials and Structures 13, n^o 2 (mars 2006) : 151–60. http://dx.doi.org/10.1080/15376490500451767.

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Carlsson, Leif A., Tomas Nordstrand et Bo Westerlind. « On the Elastic Stiffnesses of Corrugated Core Sandwich ». Journal of Sandwich Structures & ; Materials 3, n^o 4 (octobre 2001) : 253–67. http://dx.doi.org/10.1106/bkjf-n2tf-aq97-h72r.

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Wadley, H. N. G., K. P. Dharmasena, M. R. O'Masta et J. J. Wetzel. « Impact response of aluminum corrugated core sandwich panels ». International Journal of Impact Engineering 62 (décembre 2013) : 114–28. http://dx.doi.org/10.1016/j.ijimpeng.2013.06.005.

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Rejab, MRM, K. Ushijima et WJ Cantwell. « The shear response of lightweight corrugated core structures ». Journal of Composite Materials 48, n^o 30 (10 décembre 2013) : 3785–98. http://dx.doi.org/10.1177/0021998313514086.

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Rejab, M. R. M., et W. J. Cantwell. « The mechanical behaviour of corrugated-core sandwich panels ». Composites Part B : Engineering 47 (avril 2013) : 267–77. http://dx.doi.org/10.1016/j.compositesb.2012.10.031.

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Reany, Jack, et Joachim L. Grenestedt. « Corrugated skin in a foam core sandwich panel ». Composite Structures 89, n^o 3 (juillet 2009) : 345–55. http://dx.doi.org/10.1016/j.compstruct.2008.08.008.

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Yan, LL, B. Yu, B. Han, QC Zhang, TJ Lu et BH Lu. « Effects of aluminum foam filling on the low-velocity impact response of sandwich panels with corrugated cores ». Journal of Sandwich Structures & ; Materials 22, n^o 4 (22 mai 2018) : 929–47. http://dx.doi.org/10.1177/1099636218776585.

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In this study, a closed-cell aluminum foam was filled into the interspaces of a sandwich panel with corrugated cores to form a composite structure. The novel structure is expected to have enhanced foam-filled cores with high specific strength and energy absorption capacity. An out-of-plane compressive load under low-velocity impact was experimentally and numerically carried out on both the empty and foam-filled sandwich panels as well as on the aluminum foam. It is found that the empty corrugated sandwich panel has poor energy absorption capacity due to the core member buckling compared to that of the aluminum foam. However, by the filling of the aluminum foam, the impact load resistance of the corrugated panel was increased dramatically. The loading-time response of the foam-filled panel performs a plateau region like the aluminum foam, which has been proved to be an excellent energy absorption material. Numerical results demonstrated that the aluminum foam filling can decrease the corrugated core member defects sensitivity and increase its stability dramatically. The plastic energy dissipation of the core member for the foam-filled panel is much higher than that of the empty one due to the reduced buckling wavelength caused by the aluminum foam filling.

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Xia, Rong Hou, Yan Feng Guo et Wei Zhang. « Study on the Failure Mode of Corrugated Paperboard during Transport and Distribution ». Applied Mechanics and Materials 200 (octobre 2012) : 118–21. http://dx.doi.org/10.4028/www.scientific.net/amm.200.118.

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Corrugated paperboard is a kind of inexpensive and environmental-friendly packaging material and may be made into cushioning package pads to protect products from damaging during transport and distribution. By virtue of the static compression tests and impose four kinds of different compression speed on two kinds corrugated paperboard pads, This paper obtains the failure modes and the stress and strain curve. The results show that the failure of the corrugated board exhibit four stages, the linear elastic stage, the yield stage, plastic deformation and densification stage. The damage of corrugated structure pads occurs on yield and plastic deformation stage and structure damage mostly is shear crimpling on core layer. The damage of double layer corrugated paperboard is separated layer, first the bottom layer be damaged, then the top layer, until the corrugated paperboard is damaged wholly. In addition, we also find that the static compression speed has not significantly influence on the corrugated paperboard.

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Zhao, Zhenyu, Jianwei Ren, Shaofeng Du, Xin Wang, Zihan Wei, Qiancheng Zhang, Yilai Zhou, Zhikun Yang et Tian Jian Lu. « Bending Response of 3D-Printed Titanium Alloy Sandwich Panels with Corrugated Channel Cores ». Materials 14, n^o 3 (24 janvier 2021) : 556. http://dx.doi.org/10.3390/ma14030556.

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Ultralight sandwich constructions with corrugated channel cores (i.e., periodic fluid-through wavy passages) are envisioned to possess multifunctional attributes: simultaneous load-carrying and heat dissipation via active cooling. Titanium alloy (Ti-6Al-4V) corrugated-channel-cored sandwich panels (3CSPs) with thin face sheets and core webs were fabricated via the technique of selective laser melting (SLM) for enhanced shear resistance relative to other fabrication processes such as vacuum brazing. Four-point bending responses of as-fabricated 3CSP specimens, including bending resistance and initial collapse modes, were experimentally measured. The bending characteristics of the 3CSP structure were further explored using a combined approach of analytical modeling and numerical simulation based on the method of finite elements (FE). Both the analytical and numerical predictions were validated against experimental measurements. Collapse mechanism maps of the 3CSP structure were subsequently constructed using the analytical model, with four collapse modes considered (face-sheet yielding, face-sheet buckling, core yielding, and core buckling), which were used to evaluate how its structural geometry affects its collapse initiation mode.

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Garbowski, Tomasz, et Tomasz Gajewski. « Determination of Transverse Shear Stiffness of Sandwich Panels with a Corrugated Core by Numerical Homogenization ». Materials 14, n^o 8 (15 avril 2021) : 1976. http://dx.doi.org/10.3390/ma14081976.

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Knowing the material properties of individual layers of the corrugated plate structures and the geometry of its cross-section, the effective material parameters of the equivalent plate can be calculated. This can be problematic, especially if the transverse shear stiffness is also necessary for the correct description of the equivalent plate performance. In this work, the method proposed by Biancolini is extended to include the possibility of determining, apart from the tensile and flexural stiffnesses, also the transverse shear stiffness of the homogenized corrugated board. The method is based on the strain energy equivalence between the full numerical 3D model of the corrugated board and its Reissner-Mindlin flat plate representation. Shell finite elements were used in this study to accurately reflect the geometry of the corrugated board. In the method presented here, the finite element method is only used to compose the initial global stiffness matrix, which is then condensed and directly used in the homogenization procedure. The stability of the proposed method was tested for different variants of the selected representative volume elements. The obtained results are consistent with other technique already presented in the literature.

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Nemah, Ammar M., et Hatem H. Obied. « DYNAMIC BEHAVIOUR OF SANDWICH PLATE WITH DIFFERENT CORE CONFIGURATION UNDER ACTION OF IMPULSIVE LOADING ». IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING 18, n^o 4 (5 janvier 2019) : 506–26. http://dx.doi.org/10.32852/iqjfmme.v18i4.226.

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Steel sandwich structures with honeycomb and corrugated cellular cores have demonstrated the capability of supporting significant static bending loads while also enabling effective mitigation of impulse loads, the main objectives to use these structures is weight reduction and isolate or reduce the deflection and stress. This research aims to study the effect of dynamic load on the dynamic properties of various types of sandwich cores then find the best model that withstand high stresses and dissipate loads with less mass was possible. The studied model of sandwich is of dimensions (500x500x100) mm with five cells. Four types of steel sandwich plate (SSP) finite element models of various core types have been created: (1) triangle corrugated core, (2) trapezoid corrugated core, (3) square honeycomb and (4) out-of plane hexagonal honeycomb, the mass of various types was constant with value of 13.75 kg. The SSP types were compared by using ANSYS (15.0) APDL software.The finite element models are examined under the effect of transient concentrated stepped load of (350N) during 10ms. The time history response showed that the minimum von-Mises stress and minimum deflection occur at triangle corrugated SSP with values of stress (12.5Mpa) and deflection (3.8 ), but in energy absorption the square honeycomb is the best type with reduction of stress (99.65%) and reduction of deflection of (98.95%).

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Li, Huimin, Lei Ge, Baosheng Liu, Haoran Su, Tianyi Feng et Daining Fang. « An equivalent model for sandwich panel with double-directional trapezoidal corrugated core ». Journal of Sandwich Structures & ; Materials 22, n^o 7 (4 avril 2019) : 2445–65. http://dx.doi.org/10.1177/1099636219837884.

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A novel sandwich panel with double-directional corrugated core is proposed in this paper. This complex-corrugated core makes the conventional detailed finite element analysis of large structures a tough work. Thus, an equivalent homogeneous method is proposed, the key of which is to obtain the equivalent property of this novel structure. The equivalent elastic modulus considering the effect of geometrical parameters is analytically derived and verified by finite element method. Besides, equivalent shear modulus and Poisson’s ratios are obtained by finite element method. Three-dimensional detailed and equivalent models are established for further validation of this equivalent homogeneous method. Results show that elastic modulus predicted by analytical formulas is in good agreement with that by finite element method no matter how geometrical parameters change. It has been proved that stretching deformation is dominating in thickness direction, and only corrugation along loading direction can bear the load. The proposed novel sandwich structure owns better mechanical property than the conventional one with single-corrugated core. The result by equivalent model agrees well with that by detailed model, which means that this equivalent homogeneous method can well predict the macroscopic property of this novel structure.

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Mat Rejab, Mohd Ruzaimi, N. Z. M. Zaid, Januar Parlaungan Siregar et Dandi Bachtiar. « Scaling Effects for Compression Loaded of Corrugated-Core Sandwich Panels ». Advanced Materials Research 1133 (janvier 2016) : 241–45. http://dx.doi.org/10.4028/www.scientific.net/amr.1133.241.

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The compressive responses and failure investigations of corrugated-core sandwich panels subjected to lateral compression are presented. The results of finite element (FE) analysis using ABAQUS/CAE are compared with experimental results from tests on sandwich panels based on corrugations of aluminum alloy, glass fibre-reinforced plastic (GFRP) and carbon fibre-reinforced plastic (CFRP). Particular focus is placed on identifying the scaling effects of number of unit cells and the thickness of the cell walls in dominating the overall deformation and local collapse of the panel. The effect of increasing the number of unit cells and cell wall thickness are investigated. The FE predictions have been shown to in reasonably agreement with the experimental measurements. The evidence suggests that corrugated composite cores offer significant potential as lightweight cores materials in sandwich construction.

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T., Thillaikumar, Tamal Jana et Mrinal Kaushik. « Experimental Assessment of Corrugated Rectangular Actuators on Supersonic Jet Mixing ». Actuators 9, n^o 3 (17 septembre 2020) : 88. http://dx.doi.org/10.3390/act9030088.

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To improve the stealth capability of a military aircraft, the reduction in core length is essential to reduce the heat signature and the noise characteristics of the engine exhaust. The efficacy of rectangular vortex generators in achieving these objectives has been demonstrated by several researchers, owing to their simplicity. One way of producing the mixed-size vortices is by providing corrugations on the edge of the tab (actuator). Therefore, in the current study, two tabs of aspect ratio 1.5, mounted diametrically opposite to each other at the outlet of a Mach 1.73 circular nozzle, are examined at varying levels of expansions, ranging from overexpanded to underexpanded jet states. In addition, to generate the mixed-size vortices, three corrugation geometries, i.e., rectangular, triangular, and semicircular, are configured along the tab edges. Both quantitative and qualitative investigations are carried out by using the pitot probe to measure the stagnation pressures and by utilizing a shadowgraph technique to visualize the flow field. The corrugated tabs generated a significant mixing, and among them, the tabs with triangular corrugations are found to be most effective. A maximum reduction of about 99.7% in the supersonic core is obtained with triangular corrugated tabs at near-correct-expansion, corresponding to nozzle pressure ratio (NPR) 5. Interestingly, the semicircular corrugated tab significantly reduces the asymmetry near the nozzle exit plane. The shadowgraph images confirm the efficacy of different corrugated tabs in reducing the strength of the waves, prevalent in the supersonic core.

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Xin, Feng Xian, T. J. Lu et Chang Chen. « Sound Transmission through Lightweight All-Metallic Sandwich Panels with Corrugated Cores ». Advanced Materials Research 47-50 (juin 2008) : 57–60. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.57.

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The transmission of sound through all-metallic sandwich panels with corrugated cores is investigated using the space-harmonic method. The sandwich panel is modeled as two parallel panels connected by uniformly distributed translational springs and rotational springs, with the mass of the core sheets taken as lumped mass. Based on the periodicity of the panel structure, a unit cell model is developed to provide the effective translational and rotational stiffness of the core. The model is used to investigate the influence of sound incidence angle and the inclination angle between facesheet and core sheet on the sound transmission loss (STL) of the sandwich structure. The results show that the inclination angle has a significant effect on STL, and sandwich panels with corrugated cores are more suitable for the insulation of sound having small incidence angle.

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Elzayady, Nagwa, et Eltahry Elghandour. « Compression behaviour of composite sandwich panels with corrugated core ». International Journal of Sustainable Materials and Structural Systems 5, n^o 3 (2021) : 193. http://dx.doi.org/10.1504/ijsmss.2021.117732.

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Zhao, ZhenYu, Lang Li, Xin Wang, QianCheng Zhang, Bin Han et TianJian Lu. « Strength optimization of ultralight corrugated-channel-core sandwich panels ». Science China Technological Sciences 62, n^o 8 (26 décembre 2018) : 1467–77. http://dx.doi.org/10.1007/s11431-018-9356-8.

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Yu, Ye, Wen-bin Hou, Ping Hu, Liang Ying et Ganiy Akhmet. « Elastic constants for adhesively bonded corrugated core sandwich panels ». Composite Structures 176 (septembre 2017) : 449–59. http://dx.doi.org/10.1016/j.compstruct.2017.05.057.

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Li, Wanxin, Fangfang Sun, Weiyi Wei, Debo Liu, Xi Zhang, Ming Li et Hualin Fan. « Fabrication and testing of composite corrugated-core sandwich cylinder ». Composites Science and Technology 156 (mars 2018) : 127–35. http://dx.doi.org/10.1016/j.compscitech.2017.12.033.

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Elghandour, Eltahry, et Nagwa Elzayady. « Compression behaviour of composite sandwich panels with corrugated core ». International Journal of Sustainable Materials and Structural Systems 1, n^o 1 (2020) : 1. http://dx.doi.org/10.1504/ijsmss.2020.10032262.

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Cheon, Young-Jo, et Hyun-Gyu Kim. « An equivalent plate model for corrugated-core sandwich panels ». Journal of Mechanical Science and Technology 29, n^o 3 (mars 2015) : 1217–23. http://dx.doi.org/10.1007/s12206-015-0235-6.

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Odaci, Kutlay, Cenk Kılıçaslan, Alper Taşdemirci, Athanasios G. Mamalis et Mustafa Güden. « Projectile Impact Testing Aluminum Corrugated Core Composite Sandwiches Using Aluminum Corrugated Projectiles : Experimental and Numerical Investigation ». Materials Science Forum 910 (janvier 2018) : 102–8. http://dx.doi.org/10.4028/www.scientific.net/msf.910.102.

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E-glass/polyester composite plates and 1050 H14 aluminum trapezoidal corrugated core composite sandwich plates were projectile impact tested using 1050 H14 aluminum trapezoidal fin corrugated projectiles with and without face sheets. The projectile impact tests were simulated in LS-DYNA. The MAT_162 material model parameters of the composite were determined and then optimized by the quasi-static and high strain rate tests. Non-centered projectile impact test models were validated by the experimental and numerical back face displacements of the impacted plates. Then, the centered projectile impact test models were developed and the resultant plate displacements were compared with those of the TNT mass equal Conwep simulations. The projectiles with face sheets induced similar displacement with the Conwep blast simulation, while the projectiles without face sheets underestimated the Conwep displacements, which was attributed to more uniform pressure distribution with the use of the face sheets on the test plates.

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Magnucka-Blandzi, E., Z. Walczak, P. Jasion et L. Wittenbeck. « Buckling and vibrations of metal sandwich beams with trapezoidal corrugated cores – the lengthwise corrugated main core ». Thin-Walled Structures 112 (mars 2017) : 78–82. http://dx.doi.org/10.1016/j.tws.2016.12.013.

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Winterberg, F. « Laser Ignition of an Isentropically Compressed Dense Z-Pinch ». Zeitschrift für Naturforschung A 54, n^o 8-9 (1 septembre 1999) : 459–64. http://dx.doi.org/10.1515/zna-1999-8-902.

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A dense z-pinch generated by a high voltage discharge over a corrugated helical sawtooth-shaped capillary tube with a solid DT core, is by shear flow stabilized against the m = 0 and m= 1 magnetohydrodynamic instabilities, and by rotational flow against the Rayleigh-Taylor instability. The shear-and rotational flow result from jet formation by the corrugated surface. A programmed voltage pulse can then isentropically compress the DT core to high densities, and if ignited at one end by a petawatt laser pulse, a thermonuclear detonation wave can be launched propagating along the z-pinch channel. The proposed z-pinch burn should also work without tritium as a thermonuclear detonation wave in deuterium.

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V. Paul, Roy, Kriparaj K.G. et Tide P.S. « Numerical predictions of the flow characteristics of subsonic jet emanating from corrugated lobed nozzle ». Aircraft Engineering and Aerospace Technology 92, n^o 7 (4 mai 2020) : 955–72. http://dx.doi.org/10.1108/aeat-03-2019-0041.

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Purpose The purpose of this study is to investigate the aerodynamic characteristics of subsonic jet emanating from corrugated lobed nozzle. Design/methodology/approach Numerical simulations of subsonic turbulent jets from corrugated lobed nozzles using shear stress transport k-ω turbulence model have been carried out. The analysis was carried out by varying parameters such as lobe length, lobe penetration and lobe count at a Mach number of 0.75. The numerical predictions of axial and radial variation of the mean axial velocity, u′u′ ¯ and v′v′ ¯ have been compared with experimental results of conventional round and chevron nozzles reported in the literature. Findings The centreline velocity at the exit of the corrugated lobed nozzle was found to be lower than the velocity at the outer edges of the nozzle. The predicted potential core length is lesser than the experimental results of the conventional round nozzle and hence the decay in centreline velocity is faster. The centreline velocity increases with the increase in lobe length and becomes more uniform at the exit. The potential core length increases with the increase in lobe count and decreases with the increase in lobe penetration. The turbulent kinetic energy region is narrower with early appearance of a stronger peak for higher lobe penetration. The centreline velocity degrades much faster in the corrugated nozzle than the chevron nozzle and the peak value of Reynolds stress appears in the vicinity of the nozzle exit. Practical implications The corrugated lobed nozzles are used for enhancing mixing without the thrust penalty inducing better acoustic benefits. Originality/value The prominent features of the corrugated lobed nozzle were obtained from the extensive study of variation of flow characteristics for different lobe parameters after making comparison with round and chevron nozzle, which paved the way to the utilization of these nozzles for various applications.

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Shaban, M., et A. Alibeigloo. « Global bending analysis of corrugated sandwich panels with integrated piezoelectric layers ». Journal of Sandwich Structures & ; Materials 22, n^o 4 (3 juin 2018) : 1055–73. http://dx.doi.org/10.1177/1099636218780172.

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Smart corrugated sandwich panels are special types of sandwich panels which are well suited in advanced devices to provide not only high resistance capability against mechanical loads but also energy harvesting capacity for low power applications. In this paper, analytical solution for corrugated sandwich panels with embedded piezoelectric layers is presented by using three-dimensional theory of elasticity. Energy method in conjugation with homogenization approach is used to determine effective properties of corrugated cores in thickness direction. Due to extreme orthotropic nature of corrugated cores, this method can give an accurate solution by using state-space method. Accuracy of core properties is verified by comparing numerical results with previous investigations. Furthermore, reliability of presented method is guaranteed by comparing the results with finite element analysis. A comprehensive parametric study including influences of geometrical factors such as pitch, height, sheet thickness and corrugation shape is accomplished.

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