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Journal articles on the topic 'Two-core sandwich structures'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Jiang, Da Zhi, Fu Biao Yang, Su Li Xing, and Jia Yu Xiao. "Dynamic Response of Two-Core Sandwich Composite Structures under Impact." Solid State Phenomena 136 (February 2008): 115–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.136.115.

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Traditional sandwich structure consists of two face sheets and a core. With an internal sheet inserted into the core, a two-core sandwich structure is then formed. Two-core sandwich structures with composite laminated face sheets and a thin internal sheet subjected to low velocity impact are studied in this paper. Local displacement of the core under the point of impact is investigated. Simulated results show that the local displacement of the core along the direction of the impact has been decreased significantly by introducing the internal sheet into a traditional single sandwich structure a

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2

Kim, Beomkeun, and Richard M. Christensen. "Basic two-dimensional core types for sandwich structures." International Journal of Mechanical Sciences 42, no. 4 (2000): 657–76. http://dx.doi.org/10.1016/s0020-7403(99)00028-4.

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3

Li, Chang Liang, Da Zhi Jiang, Jing Cheng Zeng, and Su Li Xing. "Dynamic Response and Damage Mechanism of Two-Core Composite Sandwich Panels under Low-Velocity Impact." Applied Mechanics and Materials 405-408 (September 2013): 2810–14. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2810.

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Dynamic response and damage mechanism of two-core sandwich panels with foam and honeycomb cores and glass fiber/epoxy composite sheets under low-velocity transverse impact are investigated. The emphasis is focused on the contact force response and crash mechanism of the two-core sandwich panels. Effects of configurations, impact energy levels and types of the cores on the dynamic response are investigated. A modified drop-test experiment is carried out to obtain contact force history of the two-core sandwich structures under different impact energies. The experimental results show that the 10:

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4

Branca, Carmen, and Colomba Di Blasi. "Combustion kinetics of two core materials for sandwich structures." Journal of Thermal Analysis and Calorimetry 117, no. 2 (2014): 961–72. http://dx.doi.org/10.1007/s10973-014-3845-9.

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5

Gdoutos, E. E. "Failure Modes of Sandwich Structures." Applied Mechanics and Materials 7-8 (August 2007): 23–28. http://dx.doi.org/10.4028/www.scientific.net/amm.7-8.23.

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A thorough investigation of the failure mechanisms of composite sandwich beams under four- and three-point bending and cantilever beams was undertaken. The beams were made of unidirectional carbon/epoxy (AS4/3501-6) facings and a PVC closed-cell foam (Divinycell) core. Two types of core material H100 and H250 with densities 100 and 250 kg/m3, respectively, were used. The failure modes investigated are face sheet compressive failure, core failure and facing wrinkling. The various modes have been studied separately and both initiation and ultimate failure have been determined. Initiation of a pa

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6

Grünewald, Jonas, Patricia Parlevliet, and Volker Altstädt. "Definition of process parameters for manufacturing of thermoplastic composite sandwiches – Part A." Journal of Thermoplastic Composite Materials 31, no. 6 (2017): 745–66. http://dx.doi.org/10.1177/0892705717729013.

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Thermoplastic composite sandwich structures offer great potential to meet the demands of lightweight structures for aeronautical applications. In this study, compression moulding of sandwich components, consisting of carbon fibre reinforced polyether ether ketone (CF/PEEK) skins and polyetherimide (PEI) core structures, is studied by modelling the effect of processing conditions on the properties of the sandwich structure, particularly the skin to core bond. In order to predict the skin-to-core tensile bond strength, a theoretical model is deduced, which is based on intimate contact and autohe

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7

Ma, Quanjin, MRM Rejab, JP Siregar, and Zhongwei Guan. "A review of the recent trends on core structures and impact response of sandwich panels." Journal of Composite Materials 55, no. 18 (2021): 2513–55. http://dx.doi.org/10.1177/0021998321990734.

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It is a challenging task to advance the excellent strength and structural performance of sandwich structures, while continuing to reduce the weight and cost parameters. Thousands of researchers have studied and developed the core structural innovation with periodical achievements. This review paper concentrates on the core structural trends and impact response of sandwich panels, which highlights the novel design concepts and impact failure modes. Three kinds of core structures have been classified, which are foam-core, two- and three-dimensional periodic cores. It is shown that the core struc

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8

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

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Hexagonal honeycomb cores have found extensive applications particularly in the aerospace and naval industries. In view of the recent interest in novel strong and lightweight core architectures, square honeycomb cores were manufactured and tested under uniform lateral compression. A slotting technique has been used to manufacture the square honeycomb cores based on three different materials; glass fibre-reinforced plastic (GFRP), carbon fibre-reinforced plastic (CFRP) and self-reinforced polypropylene (SRPP). As semi-rigid polyvinyl chloride (PVC) foam was placed in each of unit cells to furth

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9

Rahman, S. K. Abdul, and Z. Halim. "Thermal Analysis of Kenaf Sandwich Core Panel." Advanced Materials Research 576 (October 2012): 488–91. http://dx.doi.org/10.4028/www.scientific.net/amr.576.488.

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The thermal stability of kenaf sandwich panel core structures are presented in this paper. Sandwich core structures tested are of varying kenaf percentage being 10, 20 and 30 wt%. The result indicated that all composite have two step degradation processes due to the presence of kenaf in epoxy. From the discussion, increasing the kenaf percent ratio will decrease the percent residue.

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10

Jedari Salami, S., M. Sadighi, M. Shakeri, and M. Moeinfar. "An Investigation on Low Velocity Impact Response of Multilayer Sandwich Composite Structures." Scientific World Journal 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/175090.

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The effects of adding an extra layer within a sandwich panel and two different core types in top and bottom cores on low velocity impact loadings are studied experimentally in this paper. The panel includes polymer composite laminated sheets for faces and the internal laminated sheet called extra layer sheet, and two types of crushable foams are selected as the core material. Low velocity impact tests were carried out by drop hammer testing machine to the clamped multilayer sandwich panels with expanded polypropylene (EPP) and polyurethane rigid (PUR) in the top and bottom cores. Local displac

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Rusnáková, Soňa, Milan Žaludek, Ladislav Fojtl, and Vladimír Rusnák. "Design and Verification of Sandwich Structures for High Speed Trains." Key Engineering Materials 586 (September 2013): 72–75. http://dx.doi.org/10.4028/www.scientific.net/kem.586.72.

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Sandwich construction is a composite material structure combining low weight, high strength and good dynamic properties. Typically a sandwich composite consists of three main parts: two thin, stiff and strong facing layers separated by a thick, light and weaker inner core. The faces are adhesively bonded to the core to obtain a load transfer between the components. By this way the properties of each separate component is utilized to the structural advantage of the whole assembly leading to a very high stiffness-to-weight and high bending strength-to-weight ratio. As a result sandwich component

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12

Sujiatanti, S. H., Achmad Zubaydi, and A. Budipriyanto. "Finite Element Analysis of Ship Deck Sandwich Panel." Applied Mechanics and Materials 874 (January 2018): 134–39. http://dx.doi.org/10.4028/www.scientific.net/amm.874.134.

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Recently various types of sandwich panel are applied for constructing bridge and ship structures. Sandwich panel is material that consists of lightweight core material and two metal faceplates. The application of sandwich panel in ship structures makes the structure less-complex and ship’s selfweight lighter because of the reduction of secondary stiffeners. This paper discusses sandwich panel that was fabricated using synthetic resin core material and two steel faceplates. This study is aimed to analyze stresses developed in the sandwich panel of 750 GT Ro-Ro ship car deck structure when it wa

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13

Li, Zheng Fa, and Zheng Dao Wang. "Characterization of the Flexural Behavior of SMP Sandwich Beam." Advanced Materials Research 123-125 (August 2010): 939–42. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.939.

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Shape memory polymers (SMPs) can have a large frozen strain but providing much lower recovery stresses. To overcome such disadvantage, sandwich structures consisted of a SMP core and two thin metallic skins was considered. Due to much compliance of the SMP core, SMP sandwich beam is buckled at a lower packaging strain. Buckling is the fundamental character of SMP sandwich beam under bending. The critical buckling parameters about two types of SMP sandwich beams were theoretically derived.

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14

Gunes, Recep, Kemal Arslan, M. Kemal Apalak, and JN Reddy. "Ballistic performance of honeycomb sandwich structures reinforced by functionally graded face plates." Journal of Sandwich Structures & Materials 21, no. 1 (2017): 211–29. http://dx.doi.org/10.1177/1099636216689462.

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This study investigates damage mechanisms and deformation of honeycomb sandwich structures reinforced by functionally graded face plates under ballistic impact. The honeycomb sandwich structure consists of two identical functionally graded face sheets, having different material compositions through the thickness, and an aluminum honeycomb core. The functionally graded face sheets consist of ceramic (SiC) and aluminum (Al 6061) phases. The through-thickness mechanical properties of face sheets are assumed to vary according to a power-law. The locally effective material properties are evaluated

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15

Austermann, Johannes, Alec J. Redmann, Vera Dahmen, Adam L. Quintanilla, Sue J. Mecham, and Tim A. Osswald. "Fiber-Reinforced Composite Sandwich Structures by Co-Curing with Additive Manufactured Epoxy Lattices." Journal of Composites Science 3, no. 2 (2019): 53. http://dx.doi.org/10.3390/jcs3020053.

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In this paper, a new process of joining additive manufactured (AM) lattice structures and carbon fiber-reinforced plastics (CFRPs) to manufacture hybrid lattice sandwich structures without secondary bonding is investigated. Multiple variations of lattice structures are designed and 3D printed using Digital Light Synthesis (DLS) and a two-stage (B-stage) epoxy resin system. The resulting lattice structures are only partially cured and subsequently thermally co-cured with pre-impregnated carbon fiber reinforcement. The mechanical properties of the additive manufactured lattice structures are cha

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16

Jędral, Arnold. "Review of Testing Methods Dedicated for Sandwich Structures with Honeycomb Core." Transactions on Aerospace Research 2019, no. 2 (2019): 1–14. http://dx.doi.org/10.2478/tar-2019-0006.

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Abstract This paper is a review of testing methods dedicated for sandwich type composite structures with honeycomb core. First, information about the composition of sandwich materials structures, their properties, types of core materials and applications in the industry is presented. Mechanical properties were compared in the case of different types of the core material. Later, tests methods needed to describe properties of those materials and normalization organizations which create them were mentioned. The testing methods were divided into two groups: mechanical and physicochemical tests. Me

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17

Bru, J., M. Leite, AR Ribeiro, L. Reis, AM Deus, and M. Fátima Vaz. "Bioinspired structures for core sandwich composites produced by fused deposition modelling." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 3 (2019): 379–93. http://dx.doi.org/10.1177/1464420719886906.

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Sandwich panels are widely used in many engineering applications where saving weight while maintaining high strength and stiffness is required. The most common core structure in sandwich panels is the two-dimensional regular hexagonal cell shape, denoted as Honeycomb. In recent times, bioinspired materials and structures have become increasingly attractive to researchers, as they provide adequate functional properties. The goal of the present work is to study two new bioinspired structures aimed at improving the performance of sandwich panel cores. Among all the large amount of structures that

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18

Yan, Chang, Xu Ding Song, and Shuo Feng. "Aluminum Foam Sandwich with Different Face-Sheet Materials under Three-Point Bending." Applied Mechanics and Materials 872 (October 2017): 25–29. http://dx.doi.org/10.4028/www.scientific.net/amm.872.25.

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Aluminum foam sandwich structure is a new type of composite material with excellent mechanical and functional properties. As it is known that properties of aluminum foam sandwiches (AFS) vary if the foam core is sandwiched between different face sheets. To study the effects of face-sheet materials on the mechanical properties of AFS and enable a better understanding of the usage of such AFS structures under flexural load, AFS sandwiched by 6061-aluminum alloy face-sheets and 304 stainless steel face-sheets were fabricated and investigated under three-point bending by using WDW-T100 electronic

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19

Le, Vinh Tung, and Nam Seo Goo. "Thermomechanical Performance of Bio-Inspired Corrugated-Core Sandwich Structure for a Thermal Protection System Panel." Applied Sciences 9, no. 24 (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

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20

Satour, A., F. Boubenider, Ali Badidi Bouda, and Rachid Halimi. "Use of Guided Waves for Inspection of Composite Skin-Honeycomb Core." Materials Science Forum 636-637 (January 2010): 1533–40. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.1533.

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Sandwich plates, made of two aluminum layers and a metal honey comb core are used in the aircraft industry. The purpose of this study is to show the ultrasonic guided waves sensibility to discover delamination in skin-honeycomb sandwich structures used in aeronautics. Separation between the skin and the core can appear during the manufacture or after use. In this work, Lamb's waves are used to control this kind of plane structure. Indeed, these waves have the advantage to put in vibration the totality of the plate that we want to control and they propagate on long distances without too much at

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21

Chanthanumataporn, Saharat, and Naoyuki Watanabe. "Free vibration of a light sandwich beam accounting for ambient air." Journal of Vibration and Control 24, no. 16 (2017): 3658–75. http://dx.doi.org/10.1177/1077546317708926.

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Sandwich structures consisting two thin faces and a thick core are increasing in demand, corresponding to the challenge to minimize weight and improve load carrying. In order to describe the free vibration of these kinds of structures, several accurate models have been proposed; however, the damping effect of ambient air, influential for lightweight structures, is always neglected. This paper originally presents a finite element formulation to study free vibration of a sandwich beam coupling with ambient air. The sandwich beam was modeled based on the sandwich theory, where the shear deformati

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22

Yan, Bing, Xinfeng Wang, Song Pan, Mingbo Tong, Jian Yu, and Fan Liu. "Stability and Failure of the Edge-Closed Honeycomb Sandwich Panels with Face/Core Debonding." Applied Sciences 10, no. 21 (2020): 7457. http://dx.doi.org/10.3390/app10217457.

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This study investigated the mechanical performance of the edge-closed honeycomb sandwich structure with face/core debonding under compressive load by experimental and numerical methods. Uniaxial compression tests of asymmetric sandwich structures with various debonding sizes between the carbon/epoxy face sheets and the honeycomb core were conducted. The experimental results showed that the failure of debonding specimens was mainly caused by the local buckling of face sheets at the debonding area. The failure zone of sandwich structures gradually translated from the edge-closed beveled area to

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23

Battley, MA, and TD Allen. "Core failure in sandwich structures subjected to water slamming loads." Journal of Sandwich Structures & Materials 21, no. 5 (2019): 1751–72. http://dx.doi.org/10.1177/1099636219837655.

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Sandwich composite materials are widely used within the marine industry, particularly as hull panels. Water impact loads, known as slamming, can be very significant for these structures, particularly for high-speed craft. These loadings generate local regions of high transverse shear forces near panel boundaries, which can result in transverse shear failures of core materials. The transient nature of slamming loads can cause stress rates that are high enough to affect the strength of the core material, particularly for polymeric foams. Despite the significant body of work on the constitutive b

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24

Behnisch, Felix, Viktoria Lichtner, Frank Henning, and Philipp Rosenberg. "Development of a Reactive Polyurethane Foam System for the Direct Sandwich Composite Molding (D-SCM) Process." Journal of Composites Science 5, no. 4 (2021): 104. http://dx.doi.org/10.3390/jcs5040104.

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Sandwich structures utilize the geometric stiffening effect by increasing the area moment of inertia. This reduces carbon fiber (CF) material within CF-reinforced plastic (CFRP) components, and thus, the CO2 footprint. A suitable material combination for lightweight design is the use of continuous fiber-reinforced face sheets with a light foam core. CFRP sandwich structures with foam core are manufactured by combining a prefabricated foam core with fiber-reinforced cover layers in a two-step press process. Besides the reduction of the used CFRP material, more efficient manufacturing processes

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Mardanshahi, Ali, Masoud Mardanshahi, and Ahmad Izadi. "Damage quantification in foam core sandwich composites via finite element model updating and artificial neural networks." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 21 (2020): 4288–304. http://dx.doi.org/10.1177/0954406220921200.

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The main idea of this paper is to propose a nondestructive evaluation (NDE) system for two types of damages, core cracking and skin/core debonding, in fiberglass/foam core sandwich structures based on the inverse eigensensitivity-based finite element model updating using the modal test results, and the artificial neural networks. First, the modal testing was conducted on the fabricated fiberglass/foam core sandwich specimens, in the intact and damaged states, and the natural frequencies were extracted. Finite element modeling and inverse eigensensitivity-based model updating of the intact and

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Ruan, Dong, Mohd Azman Yahaya, James Hicks, Jayson Lloyd, and Feng Zhu. "An Experimental Study on a Novel Cladding System with Aluminium Honeycomb Core." Advanced Materials Research 261-263 (May 2011): 770–74. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.770.

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Sandwich panels consisting of two aluminium two face-sheets and a core made of aluminium honeycomb were studied in this paper. These sandwich panels are good candidates for cladding systems employed to protect other structures again blast loadings. In this paper, the mechanical response and deformation of these sandwich panels subjected to simulated blast loadings are investigated experimentally. The effects of impact pulse, foil thickness and cell size of aluminium honeycombs have been discussed.

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Khadem, M., and M. M. Kheirikhah. "Bending Analysis of SMA Embedded Rectangular Laminated Sandwich Plates with Soft Core Using 3D Finite Element Method." Applied Mechanics and Materials 110-116 (October 2011): 1458–65. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.1458.

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Nowadays Shape Memory Alloys (SMAs) are used as actuators in many applications such as aerospace structures. In sandwich structures, the SMA wires or plates are used in the skins for shape control of the structure or vibration damping. In this paper, bending behavior of sandwich plates with embedded SMA wires in their skins is studied. 3D finite element method is used for construction and analysis of the sandwich plate with a flexible core and two stiff skins. Some important points such as continuity conditions of the displacements, satisfaction of interlaminar transverse shear stresses, the c

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Nazari, AR, MZ Kabir, H. Hosseini-Toudeshky, Y. Alizadeh Vaghasloo, and S. Najafian. "Investigation of progressive failure in the composite sandwich panels with elastomeric foam core under concentrated loading." Journal of Sandwich Structures & Materials 21, no. 8 (2017): 2585–615. http://dx.doi.org/10.1177/1099636217719424.

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Failure and damage of crushable materials employed as core for the sandwich structures reduces serviceability and energy absorption capacity of the components especially under bending load so that many beneficial properties seem to be achieved by application of noncrushable lightweight materials instead of crushable foams as core for the sandwich structures. In this paper, an elastomeric foam is employed as core for two aspect ratios of the composite sandwich panels and the enhancement of the load-carrying capacity in the elastomeric foam-cored sandwich panels is investigated in comparison to

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29

Zaharia, Sebastian Marian, Lucia Antoneta Chicoș, Camil Lancea, and Mihai Alin Pop. "Effects of Homogenization Heat Treatment on Mechanical Properties of Inconel 718 Sandwich Structures Manufactured by Selective Laser Melting." Metals 10, no. 5 (2020): 645. http://dx.doi.org/10.3390/met10050645.

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In this study, lightweight sandwich structures with honeycomb cores are proposed and their mechanical properties are investigated through experiments and FEA (finite element analysis) simulation. Sandwich structures were fabricated out of Inconel 718 using selective laser melting technique with two different topologies—sandwich structures with perforated skin (SSPS) and sandwich structures with perforated core (SSPC). In addition, the effect of the homogenization heat treatment on the mechanical properties of the sandwich samples subjected to compression and microhardness tests was analyzed. R

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Saidani, K., Kamal Ait Tahar, and S. Merakeb. "Mechanical Behavior of a Sandwich Composite with Cardboard Core Reinforced Fabric." Advanced Materials Research 682 (April 2013): 9–16. http://dx.doi.org/10.4028/www.scientific.net/amr.682.9.

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A sandwich structure is obtained from two skins or soles, with good mechanical characteristics, bonded to a core made of a lightweight material of low resistance. Glued to a core made of a lightweight material of low resistance. The strength and modulus of elasticity of the skin condition the bending behavior of a sandwich. Bending, the skins of the sandwich are solicited in traction and in compression, while the core is subjected to shear. Our study focuses on the experimental characterization under flexural load of new composite sandwich combined. The sandwich proposed constituted of two ski

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31

Rupp, Peter, Peter Elsner, and Kay A. Weidenmann. "Failure mode maps for four-point-bending of hybrid sandwich structures with carbon fiber reinforced plastic face sheets and aluminum foam cores manufactured by a polyurethane spraying process." Journal of Sandwich Structures & Materials 21, no. 8 (2017): 2654–79. http://dx.doi.org/10.1177/1099636217722052.

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This work focuses on failure mode maps of sandwich panels exposed to bending load, which were produced using a polyurethane spraying process. This process allows for an automated production of sandwich panels omitting a separate bonding step of the face sheets to the core. The investigated sandwich panels consisted of carbon fiber reinforced face sheets in various configurations, and four different core structures of aluminum foam or Nomex honeycomb. After production, measurements of the pores inside the core foam structures, the fiber package thickness inside the face sheets, and the density

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32

OPRAN, Constantin Gheorghe, Cătălina Bivolaru, and Diana Murar. "Researches Concerning Structural and Mechanical Behavior of Sandwich Composite Polymeric Products." Key Engineering Materials 498 (January 2012): 151–60. http://dx.doi.org/10.4028/www.scientific.net/kem.498.151.

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The sandwich composite polymeric products have a wide utilization in various fileds like aircraft and automotive construction, load bearing structures, sports equipment, more specifically, wherever weight-saving is required. Sandwich composites polymeric products represent excellent examples of the potential offered by composite materials. The combination of two composite faces and a lightweight polystyrene core allows obtaining a high flexural stiffness with a weak mass. This paper deals with the analysis of the structural and mechanical behavior properties of the core, adhesive and faces, fo

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33

Maleki, I., and O. Rahmani. "A closed-form solution for the bending analysis of composite sandwich pipe with compliance core based on high-order sandwich theory." Journal of Sandwich Structures & Materials 22, no. 6 (2018): 1786–811. http://dx.doi.org/10.1177/1099636218789622.

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In this paper, bending of cylindrical sandwich pipes based on the high-order theory of sandwich structures with flexible core is investigated. The cylindrical sandwich pipe is composed of a flexible core and two composite face sheets. Behavior of the cylindrical sandwich pipe is described by a high-order sandwich shell theory, which explains nonlinear distortions of cross-sectional plane of the flexible core as well as changes in its height. The theory based on variational principles and using an extremely thorough systematic closed-form approach is formulated. In this model, no assumption has

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Yu, Lingyu, Zhenhua Tian, Xiaopeng Li, Rui Zhu, and Guoliang Huang. "Core–skin debonding detection in honeycomb sandwich structures through guided wave wavefield analysis." Journal of Intelligent Material Systems and Structures 30, no. 9 (2018): 1306–17. http://dx.doi.org/10.1177/1045389x18758180.

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Ultrasonic guided waves have proven to be an effective and efficient method for damage detection and quantification in various plate-like structures. In honeycomb sandwich structures, wave propagation and interaction with typical defects such as hidden debonding damage are complicated; hence, the detection of defects using guided waves remains a challenging problem. The work presented in this article investigates the interaction of low-frequency guided waves with core–skin debonding damage in aluminum core honeycomb sandwich structures using finite element simulations. Due to debonding damage,

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35

Liang, Minzu, Xiangyu Li, Yuliang Lin, Kefan Zhang, and Fangyun Lu. "Theoretical Analysis of Blast Protection of Graded Metal Foam-Cored Sandwich Cylinders/Rings." Materials 13, no. 17 (2020): 3903. http://dx.doi.org/10.3390/ma13173903.

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The blast resistance of a sandwich-walled cylinder/ring comprising two metal face-sheets and a graded metal foam core, subjected to internal air blast loading, is investigated. Analytical models are developed for the deformation of the sandwich cylinder with positive and negative gradient cores under internal blast loading. The deformation process is divided into three distinct phases, namely the fluid–structure interaction phase, core-crushing phase, and outer face-sheet deformation phase. Finite element modeling is performed using the Voronoi material model. The proposed analytical models ar

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Fojtl, Ladislav, Soňa Rusnáková, and Milan Žaludek. "Influence of Honeycomb Core Compression on the Mechanical Properties of the Sandwich Structure." Applied Mechanics and Materials 486 (December 2013): 283–88. http://dx.doi.org/10.4028/www.scientific.net/amm.486.283.

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This research paper deals with an investigation of the influence of honeycomb core compression on the mechanical properties of sandwich structures. These structures consist of prepreg facing layers and two different material types of honeycomb and are produced by modified compression molding called Crush-Core technology. Produced structures are mechanically tested in three-point bending test and subjected to low-velocity impact and Charpy impact test.

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Alsubari, S., M. Y. M. Zuhri, S. M. Sapuan, M. R. Ishak, R. A. Ilyas, and M. R. M. Asyraf. "Potential of Natural Fiber Reinforced Polymer Composites in Sandwich Structures: A Review on Its Mechanical Properties." Polymers 13, no. 3 (2021): 423. http://dx.doi.org/10.3390/polym13030423.

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The interest in using natural fiber reinforced composites is now at its highest. Numerous studies have been conducted due to their positive benefits related to environmental issues. Even though they have limitations for some load requirements, this drawback has been countered through fiber treatment and hybridization. Sandwich structure, on the other hand, is a combination of two or more individual components with different properties, which when joined together can result in better performance. Sandwich structures have been used in a wide range of industrial material applications. They are kn

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Gupta, Nikhil, and S. Sankaran. "On the Characterisation of Syntactic Foam Core Sandwich Composites for Compressive Properties." Journal of Reinforced Plastics and Composites 18, no. 14 (1999): 1347–57. http://dx.doi.org/10.1177/073168449901801406.

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Sandwich structures, especially those with honeycomb and grid structures as the core material, are very commonly employed in aircraft structures. There is an increasing use of closed-pore rigid syntactic foams as core materials in sandwich constructions because they possess a number of favourable properties. The syntactic foams, owing to their structure and formation, behave differently under compression compared to other traditionally used core materials. In the present study, therefore, syntactic foam core sandwich constructions are evaluated for their behaviour under compression in both edg

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Lohr, Christoph, Markus Muth, Ralf Dreher, Carolin Zinn, Peter Elsner, and Kay André Weidenmann. "Polymer-Steel-Sandwich-Structures: Influence of Process Parameters on the Composite Strength." Key Engineering Materials 809 (June 2019): 266–73. http://dx.doi.org/10.4028/www.scientific.net/kem.809.266.

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As the demand of the automotive and aerospace industries for lightweight and cost effective materials increases, it is necessary to combine different materials with respect to their lightweight and functional properties. The combination of polymer-steel-sandwich composites - which consist of a polymer core structure (transferring shear loads) and two metal face-layers (absorbing tensile and compression loads occurring at bending) - suite the need of minimizing weight per area under bending loads. The reduction of process steps can be achieved by connecting the face layers and core in-situ via

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Nikolić, Ružica R., Jelena M. Djoković, and Ján Bujňák. "Optimization of the Sandwich Column with the Truss Core Which is Subjected to the Compressive Loading." Civil and Environmental Engineering 12, no. 1 (2016): 47–54. http://dx.doi.org/10.1515/cee-2016-0007.

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Abstract The sandwich structures have multifold advantages with respect to other types of structures. Besides the architectural possibilities due to their appearance, those structures can carry the same or even higher loads than some other similar structures. Optimization of the sandwich columns with the truss core, subjected to the compressive axial load, is presented in this paper. The two types of optimization were performed: the three-parameter and the four-parameter optimization - the so called full optimization. The optimization of the column geometry (face thickness, core member height

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Xu, Jun, Yaobo Wu, Xiang Gao, Huaping Wu, Steven Nutt, and Sha Yin. "Design of composite lattice materials combined with fabrication approaches." Journal of Composite Materials 53, no. 3 (2018): 393–404. http://dx.doi.org/10.1177/0021998318785710.

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Lattice materials can be designed through their microstructure while concurrently considering fabrication feasibility. Here, we propose two types of composite lattice materials with enhanced resistance to buckling: (a) hollow lattice materials fabricated by a newly developed bottom-up assembly technique and the previously developed thermal expansion molding technique and (b) hierarchical lattice materials with foam core sandwich trusses fabricated by interlocking assembly process. The mechanical performance of sandwich structures featuring the two types of lattice cores was tested and analyzed

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Jin, Mingmin, Yingcheng Hu, and Bing Wang. "Compressive and bending behaviours of wood-based two-dimensional lattice truss core sandwich structures." Composite Structures 124 (June 2015): 337–44. http://dx.doi.org/10.1016/j.compstruct.2015.01.033.

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Hoala, Safaa Mohammed, Hatem Hadi Obeid, and Essam Zuheir Fadhel. "The Numerical and Experimental Analysis to Study the Effect of Double Triangle Core on the Dynamic Response of Sandwich Structure." Al-Qadisiyah Journal for Engineering Sciences 13, no. 1 (2020): 36–44. http://dx.doi.org/10.30772/qjes.v13i1.625.

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Sandwich structure plates are most widely used in the automotive, aerospace and naval structures. As it gives material with low density and relatively high normal compression and shear properties. In this paper, Finite element method was used with ANSYS APDL (16) to analyze the effect of duplicate core in sandwich steel structure on the dynamic response under the action of impact loading. Also, conducted impact tests with hammer and NI devises to achieve the simulation results. The chief purpose of this work is to get a high reduction in deformation between upper and lower skins. Isolate defle

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Shen, Yiou, Yan Li, Wesley Cantwell, and Yu Yuan Zhao. "The Fracture Properties of Sandwich Structures Based on a Metal Foam Core." Advanced Materials Research 936 (June 2014): 2054–62. http://dx.doi.org/10.4028/www.scientific.net/amr.936.2054.

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The fracture properties of a series of metal foam sandwich structures based on glass fiber-reinforced polyamide 6,6 composite (GF/PA6,6) skins have been investigated. The open cell core materials were manufactured using the Lost Carbonate Sintering (LCS) process, a recently-developed technique for manufacturing metal foams. Initially, the effect of varying the compaction pressure used in producing the metal foams as well as the density of the samples were investigated through a series of compression tests. Here, it was shown that the compressive strength and the elastic modulus of the foams va

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Zhou, J., Z. W. Guan, and W. J. Cantwell. "The perforation resistance of sandwich structures subjected to low velocity projectile impact loading." Aeronautical Journal 116, no. 1186 (2012): 1247–62. http://dx.doi.org/10.1017/s0001924000007624.

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Abstract This article presents the findings of a study to investigate the impact perforation resistance of sandwich structures. The dynamic response of sandwich panels based on PVC foam cores has been evaluated by determining the energy to perforate the panels. The impact response of the sandwich structures was predicted using the finite element analysis package Abaqus/Explicit. The validated FE models were also used to investigate the effect of oblique loading and to study the impact response of sandwich panels subjected to a pressure differential equivalent to flying at an altitude of 10,000

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Pernas-Sánchez, Jesús, Jose A. Artero-Guerrero, David Varas, and Filipe Teixeira-Dias. "Cork Core Sandwich Plates for Blast Protection." Applied Sciences 10, no. 15 (2020): 5180. http://dx.doi.org/10.3390/app10155180.

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A numerical model is developed and validated to analyse the performance of aluminium skin and agglomerated cork core sandwich plates subjected to blast loads. Two numerical approaches are used and thoroughly compared to generate the blast loading: an Arbitrary-Lagrangian–Eulerian approach and the Load Blast Enhanced method. Both of the models are validated by comparing the numerical results with experimental observations. A detailed analysis of the sandwich behaviour is done for both approaches showing small differences regarding the mechanical response of the sandwich structure. The results o

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Remennikov, Alex, Dulara Kalubadanage, Tuan Ngo, Priyan Mendis, Gursel Alici, and Andrew Whittaker. "Development and performance evaluation of large-scale auxetic protective systems for localised impulsive loads." International Journal of Protective Structures 10, no. 3 (2019): 390–417. http://dx.doi.org/10.1177/2041419619858087.

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Cellular core structures with a negative Poisson’s ratio, also known as auxetic core structures, are gaining attention due to their unique performance in sandwich panel systems for protecting critical infrastructures and military vehicles that are at high risk of blast and impact loads due to accidental and deliberate events. To help develop a high-performance protective system, this article outlines the performance evaluation of five different auxetic cell configurations based on a quantitative/qualitative review of an experimental load–deformation relationship of three-dimensional-printed au

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Lascano, Diego, Rene Guillen-Pineda, Luis Quiles-Carrillo, et al. "Manufacturing and Characterization of Highly Environmentally Friendly Sandwich Composites from Polylactide Cores and Flax-Polylactide Faces." Polymers 13, no. 3 (2021): 342. http://dx.doi.org/10.3390/polym13030342.

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This work focuses on the manufacturing and characterization of highly environmentally friendly lightweight sandwich structures based on polylactide (PLA) honeycomb cores and PLA-flax fabric laminate skins or facings. PLA honeycombs were manufactured using PLA sheets with different thicknesses ranging from 50 to 500 μm. The PLA sheets were shaped into semi-hexagonal profiles by hot-compression molding. After this stage, the different semi-hexagonal sheets were bonded together to give hexagonal panels. The skins were manufactured by hot-compression molding by stacking two Biotex flax/PLA fabrics

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Nestler, Daisy, Heike Jung, Maik Trautmann, et al. "New Sandwich Structures Consisting of Aluminium Foam and Thermoplastic Hybrid Laminate Top Layers." Materials Science Forum 825-826 (July 2015): 797–805. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.797.

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Sandwich structures consist of one light core layer and two top layers, which form the load-bearing structure. These layers have to be stiff and strong and have to protect the structure against indentations. The main task of the core layer is to keep the top layers in place and to generate a high shear stiffness. In order to obtain the required space between the top layers, the core layer has to have a high specific volume. Different sandwich materials with aluminium or steel top layers and cores of aluminium combs, corrugated aluminium sheets or aluminium foams are already known. In order to

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Nagasankar, P., S. Balasivanandha Prabu, Velmurugan Ramachandran, and R. Paskaramoorthy. "Experimental Investigation on Dynamic Characteristics of Polypropylene Honeycomb Sandwich Structures under the Influences of Different Temperatures." Applied Mechanics and Materials 606 (August 2014): 153–57. http://dx.doi.org/10.4028/www.scientific.net/amm.606.153.

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The dynamic characteristics of the Polypropylene honeycomb (PPHC) sandwich composites have been investigated under various temperatures (30°,35°,40°,45°,50°,55°,60°, 65°,70°,75° and 80°C) and different orientations (0° and 90°) of the glass fibers in the composites. Since the thermal properties of the constituent materials (glass fiber, epoxy resin and PPHC core) of the PPHC sandwich composites are different and the in-plane effect of the composites varies with the two different orientations (0° and 90°) of the fibers, the variation of the loss factor under the various temperatures are also di

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