Showing papers on "Sandwich panel published in 2020"
TL;DR: In this paper, the authors investigated the effects of the propagated wave in a sandwich structure with a soft core and multi-hybrid nanocomposite (MHC) face sheets.
Abstract: In the current report, characteristics of the propagated wave in a sandwich structure with a soft core and multi-hybrid nanocomposite (MHC) face sheets are investigated. The higher-order shear deformable theory (HSDT) is applied to formulate the stresses and strains. Rule of the mixture and modified Halpin–Tsai model are engaged to provide the effective material constant of the multi-hybrid nanocomposite face sheets of the sandwich panel. By employing Hamilton’s principle, the governing equations of the structure are derived. Via the compatibility rule, the bonding between the composite layers and a soft core is modeled. Afterward, a parametric study is carried out to investigate the effects of the CNTs' weight fraction, core to total thickness ratio, various FG face sheet patterns, small radius to total thickness ratio, and carbon fiber angel on the phase velocity of the FML panel. The results show that the sensitivity of the phase velocity of the FML panel to the
$${W}_{\rm{CNT}}$$
and different FG face sheet patterns can decrease when we consider the core of the panel more much thicker. It is also observed that the effects of fiber angel and core to total thickness ratio on the phase velocity of the FML panel are hardly dependent on the wavenumber. The presented study outputs can be used in ultrasonic inspection techniques and structural health monitoring.
109 citations
TL;DR: A review of precast concrete sandwich panels can be found in this paper, where the authors evaluate the body of research undertaken and analyse proposed design-solutions and test-results to identify future research focuses.
82 citations
TL;DR: In this article, the authors employed the Finite Element Analysis (FEA) to investigate the deformation behaviors of proposed structures considering the rate-dependent properties, elastoplastic response and nonlinear contact.
Abstract: Gradual and localised changes in mechanical properties can be achieved by functionally graded cellular structures with the aim to improve structural performance. Gyroid belongs to a class of cellular structures that naturally inspired continuous non-self-intersecting surfaces with controllable mechanical properties. In this work, dynamic compression on functionally graded gyroid and sandwich composite panels constructed from functionally graded gyroid core and metallic facets are numerically investigated and compared to evaluate the dynamic behaviours when subjected to extreme loadings. The Finite Element Analysis (FEA) is employed to investigate the deformation behaviours of proposed structures considering the rate-dependent properties, elastoplastic response and nonlinear contact. The Johnson-Cook model is utilised to capture the rate-dependent dynamic responses of the gyroid panels. The numerical model is then validated with experimental results under quasi-static compression. Due to the symmetry, only a quarter of the gyroid panel is modelled using shell elements, which offers significantly reduction in computational cost. Parametric studies are conducted to demonstrate the influences of different functionally graded cores on the blast resistances of gyroid composite panels. Reaction forces and critical stress extracted from underneath protected structure are assessed. Fuctionally graded gyroid sandwich structures clearly demonstrate unique dynamic crushing responses, impact energy mitigation & dissipation mechanisms, which leads to enhancement of the blast resistance.
66 citations
TL;DR: In this paper, two re-entrant hierarchical sandwich panels constructed by substituting the cell walls of reentrant honeycombs with isotropic regular hexagon substructure and equilateral triangle substructure are proposed, and their crashworthiness performance has been investigated systematically.
48 citations
TL;DR: In this article, the authors presented the low-velocity impact behavior of sandwich panel with carbon fiber reinforced plastic (CFRP) composite facesheet and Nomex honeycomb core through experimental and numerical methods.
43 citations
TL;DR: In this article, the low-energy impact response of woven carbon fibre reinforced plastic (CFRP) composite sandwich panels with thermoplastic honeycomb and reentrant cores was investigated experimentally and numerically under three different impact energies (20,J, 40,J and 70,J).
Abstract: In the present study, the low-energy impact response of woven carbon fibre reinforced plastic (CFRP) composite sandwich panels with thermoplastic honeycomb and reentrant cores was investigated experimentally and numerically under three different impact energies (20 J, 40 J and 70 J). The Acrylonitrile Butadiene Styrene (ABS) honeycomb and reentrant core structures were manufactured in-plane and out-of-plane oriented via 3D printer, and adhesively bonded with two CFRP face sheets. The results indicate that the in-plane reentrant core based composite sandwich panel exhibits better impact strength and energy dissipation behavior than the in-plane and out-of-plane honeycomb core based composite sandwich panels.
42 citations
TL;DR: In this article, the authors proposed a type of lightweight multilayer honeycomb membrane-type acoustic metamaterials and the transmission loss is studied experimentally, which can break the mass law and obtain the great sound transmission loss at a light-weight.
40 citations
TL;DR: In this paper, the mechanical behavior of multilayer corrugated core laminated composite sandwich panel subjected to quasi-static three-point bending is investigated experimentally as well as numerically.
39 citations
TL;DR: In this article, the authors considered the use of vibro-acoustic resonant metamaterials to improve the acoustic insulation performance at the frequency region of this resonance while adding only 8% of mass to the double panel, hence maintaining its lightweight characteristics.
37 citations
TL;DR: In this article, the modal responses of multi-walled carbon nanotube-reinforced composite sandwich structural plate are computed under the elevated temperature environment using a higher-order polynomial kinematic model and the isoparametric finite element steps.
35 citations
TL;DR: In this article, an analytical model based on energy approach is developed to predict contact force, contact time, impactor displacement, energy absorption and failure modes for composite sandwich panels with closed-cell foam core.
TL;DR: The cylindrical DAA structure performed much better than its equal solid panel in both blast resistance and energy absorption capacity and can be used as a reference for different applications.
TL;DR: In this article, a closed-cell aluminum foam was filled into the interspaces of a sandwich panel with corrugated cores to form a composite structure, which was expected to have enhanced performance.
Abstract: 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 ...
TL;DR: In this article, a reentrant hexagon honeycomb cored sandwich panel and a homogenous steel plate were used to construct a protect system, and a novel multi-scale optimization was conducted to further improve the performance of the protect system.
TL;DR: In this paper, the authors investigated thin, lightweight precast concrete sandwich cladding panels that embed high performance insulation between two thin concrete wythes and found that thermal bridging is a major source of heat loss in the thin wall design.
Abstract: Thin, lightweight alternatives to standard precast concrete sandwich panels have received much research and design focus in recent years. Some designs have been structurally tested and validated. Much less focus has, however, been given to their thermal performance. This study thermally investigates thin, lightweight precast concrete sandwich cladding panels that embed high performance insulation between two thin concrete wythes. A sample thin design is experimentally tested using a hot plate apparatus to evaluate its thermal performance. Finite element modelling is then used to further investigate the common features of thin panel designs and potential areas of heat loss. The analysed representative thin sample sandwich panel (150 mm thick) achieves an average U-value of 0.324 W m −2 K−1 ; this is 16% lower than that of a typical 315 mm thick sandwich panel with 100 mm of polystyrene foam insulation. Thermal bridging is identified as a major source of heat loss in the thin wall design, accounting for up to 71% of the total thermal transmittance of the tested thin sandwich panel. In standard walls this is usually less than 20%. Some of the features of the tested design can be improved to significantly reduce the effect of the thermal bridging and reduce the U-value by 59% to 0.13 W m −2 K−1 in an optimised panel design.
TL;DR: In this paper, the vibration and sound properties of a type of metamaterial sandwich panels are investigated and compared numerically, and the reduction on the vibration, sound radiation and sound transmission is studied.
TL;DR: In this article, the authors proposed a new periodic cellular material (PCM) by integrating the X-lattice into a rectangular honeycomb, which significantly reduced the bulk turbulent energy magnitude and limit the convective transport of the high turbulent kinetic energy to the endwalls.
TL;DR: In this article, a robust thermal-structural coupled finite element (FE) model was developed for the UHPC CSPs to assess their thermal bowing behavior, and the analysis revealed that panel deflections increased with the degree of composite action but satisfied serviceability requirements for the full range of temperatures.
TL;DR: In this article, a design framework is presented for the development of an architected 2D solid with targeted mechanical properties thanks to an optimized porosity distribution, where a 2D lattice of regular hexagons is considered as core element of a sandwich panel and a Bloch-Floquet-based approach is adopted to derive homogenized equivalent properties.
TL;DR: In this paper, a numerical solution for free vibration analysis of sandwich cylindrical panels made of a saturated functionally graded porous core and two similar homogenous homogenous cores is presented.
Abstract: In this paper a numerical solution is presented for free vibration analysis of sandwich cylindrical panels made of a saturated functionally graded porous (FG-porous) core and two similar homogenous...
TL;DR: In this paper, the performance of an aluminum-rubber composite plate under impact loading was investigated using both experimental and numerical methods, and it was found that the composite plate with rubber on front face provided higher performance to absorb the energy.
Abstract: This paper aims to investigate the performance of an aluminum–rubber composite plate under impact loading. The impact resistance of the plate has been evaluated using both experimental and numerical methods. The experimental tests were carried out using gas gun at velocities of 75, 101, 144 and 168 m/s. The energy absorption of composite plates has been closely examined for all samples. The effect of rubber layer positioning either on front face or on back face of the aluminum plate was also evaluated. It was found that the composite plate with rubber on front face provides higher performance to absorb the energy. In parallel to the experiment, a finite element model was created using the finite element software LS-DYNA to simulate the response of the aluminum–rubber composite plate under a high energy rate loading condition. The data obtained from finite element modeling shown a close agreement with the experimental results in terms of failure mechanism and energy absorption. In addition, a parametric study was carried out incorporating different impact velocities, rubber formulation, rubber layer thickness, interface bonding strength between rubber and aluminum layers and ballistic performance of aluminum-rubber sandwich panel. It was concluded that by increasing the rubber layer's thickness the energy absorption of the composite plate will be increased, especially when rubber layer placed in front face of the aluminum plate. Although at high interface bonding of rubber and aluminum layer, the composite with rubber layer in front face has better performance, but low bonding of interface lead to higher energy absorption in back face configuration.
01 Nov 2020
TL;DR: In this article, the structural performance of a new type of precast concrete sandwich panels, for which reinforced geopolymer concrete is used as two wythes and connectors made of fiber-reinforced polymer composites are used to realize the composition action, is investigated.
TL;DR: In this article, a Generalized Differential Quadrature (GDQ) is used for active vibration suppression of flexible spacecraft appendages embedded with piezoelectric (PZT) patches.
TL;DR: In this article, a novel all-composite sandwich panel with corrugated core was fabricated using the hot press molding method according to the surface ablation and transient heat transfer theory.
TL;DR: In this paper, the dynamic response of clamped square sandwich panels (SP) with layered-gradient metal foam core subjected to blast loading was investigated, and the analytical solutions for maximum deflection over the center point of the panels were obtained.
Abstract: Graded core sandwich structures have great potential for designing and optimization under special requirement. In the present work, the dynamic response of clamped square sandwich panel (SP) with layered-gradient metal foam core subjected to blast loading was investigated. A new yield criterion of SP with three-layer metal foam core was proposed, and the analytical solutions for maximum deflection over the center point of the panels were obtained. Furthermore, the corresponding results of finite element simulations and experiments were compared to validate the theoretical model. The numerical simulation and experimental results both show good agreements with theoretical predictions. It is shown that the uniform core SP is better than that of the gradient core one and the negative gradient SP is superior to that with positive gradient core in blast resistance for the same equivalent mass. Finally, the minimum mass designs of three-layer SP are stated by constructing geometry optimization diagram according to analytical formula. The theoretical analysis established is of great important in guiding engineering application of sandwich structure with multi-layer core under air-blast loading.
TL;DR: In this paper, the authors proposed a new sandwich panel by introducing the multifunctional pyramidal lattice into a plate fin sandwich panel, which significantly enhances the overall Nusselt number of the plate fin by up to 150%.
TL;DR: In this paper, the phase of wavefield video in the physical domain is applied to a stiffened curved composite sandwich panel for visualization of a barely visible impact dam, which is used to simulate the impact of a dam.
Abstract: Imaging a damage using the phase of wavefield “video” in the physical domain is developed and applied to a stiffened curved composite sandwich panel for visualization of a barely visible impact dam...
TL;DR: In this paper, the nonlinear primary resonances of symmetric rectangular honeycomb sandwich panels with simply supported boundaries along all four edges were derived by using Hamilton's principle and Reddy's third-order shear deformation theory.
Abstract: The nonlinear primary resonances of symmetric rectangular honeycomb sandwich panels with simply supported boundaries along all four edges are studied. The nonlinear governing equations of the symmetric rectangular honeycomb sandwich panel subjected to transverse excitations are derived by using Hamilton's principle and Reddy's third-order shear deformation theory. These nonlinear partial differential equations are reduced into nonlinear ordinary differential equations by the Galerkin method. Based on the homotopy analysis method, the average equations of the primary resonance are obtained. For all the three primary resonances cases, the frequency-response curves of primary resonance are constructed. Comparison studies on the forced vibration of cubic non-linearity system are conducted to verify the correctness and accuracy of the homotopy analysis method. Effects of thickness-to-length ratio, width-to-length ratio and transverse excitation on the nonlinear primary response have been investigated for honeycomb sandwich panels.
TL;DR: In this article, a combined finite element-modal strain energy (FE-MSE) method was proposed to predict the vibration damping performance and explore the underlying enhancement mechanisms, with the frequency-dependent damping behaviors of polyurea considered.