Experimental and numerical investigation on the anti-penetration performance of metallic sandwich plates for marine applications

2019 ◽  
Vol 22 (2) ◽  
pp. 494-522 ◽  
Author(s):  
Na Zhao ◽  
Renchuan Ye ◽  
Ali Tian ◽  
Jie Cui ◽  
Peng Ren ◽  
...  
Keyword(s):  
Aluminum Foam ◽  
Failure Modes ◽  
Sheet Thickness ◽  
Face Sheet ◽  
Sandwich Plates ◽  
Ballistic Limit ◽  
Ballistic Performance ◽  
Core Thickness ◽  
Protective Structures ◽  
Constitutive Parameters

To predict the anti-penetration performance of protective structures, the ballistic performance of sandwich plates with steel face-sheet and aluminum foam core, the quasi-static compressive experiments of four different aluminum foam are performed and analyzed. The failure mechanism, mechanical parameters, and modified constitutive model are obtained. The virtual tests using numerical simulation were carried out in different penetration velocities based on quasi-static experimental constitutive parameters. Influence of projectile shape, face-sheet thickness, core thickness, and core densities on the residual velocity and plastic deformation of sandwich plates are discussed, while typical penetration failure modes and deformation mechanism are presented and analyzed. The failure modes of sandwich plates are different for hemisphere- and blunted-nosed projectile and the projectile shape influence is significant for ballistic performance when the penetration velocity approaches ballistic limit. The ballistic limit increases with increase of face-sheet or core thickness, core density and which shows an approximate linear relationship.

Ballistic impact behaviors of aluminum alloy sandwich panels with honeycomb cores: An experimental study

2016 ◽  
Vol 20 (7) ◽  
pp. 861-884 ◽  
Author(s):  
QN Zhang ◽  
XW Zhang ◽  
GX Lu ◽  
D Ruan
Keyword(s):  
Aluminum Alloy ◽  
Energy Absorption ◽  
Impact Velocity ◽  
Sandwich Panels ◽  
Sheet Thickness ◽  
Face Sheet ◽  
Ballistic Limit ◽  
Core Density ◽  
Impact Tests ◽  
Honeycomb Cores

To study the protection property of aluminum alloy sandwich panels with honeycomb cores under the attack of bullets or debris, quasi-static perforation, and ballistic impact tests were conducted, in which the thicknesses of the face sheet and core were 0.5–2.0 and 12.7 mm, respectively, while projectiles with diameter 7.5 mm and impact velocity 50–220 m/s were employed. Based on the experiments, the influences of impact velocity, face sheet thickness, core density as well as the nose shape of the projectiles were investigated. The results showed that in the impact tests, the sandwich panels dissipated much more energy than those in quasi-static perforation tests, and the energy absorption and ballistic limit of the sandwich panels increased with the increase of impact velocity. The influence of face sheet thickness was more remarkable than the core density, which was due to the relative density of honeycomb is too small. Although the increase of core density could induce the increase of energy absorption, this effect is more effective for thinner face sheet. Moreover, under the same impact velocity about 200 m/s and face sheet thickness 1.0 mm, the ballistic limit for conical-nosed projectile is highest, while it is lowest for flat-nosed projectile.

Sound Insulation Performance of Finite Orthotropic Sandwich Panels

2013 ◽  
Vol 377 ◽  
pp. 12-16 ◽  
Author(s):  
Sheng Chun Wang ◽  
Wei Dong Shen ◽  
Jia Feng Xu ◽  
Pei Wen Wang ◽  
Yun Li
Keyword(s):  
Transmission Loss ◽  
Sandwich Panels ◽  
Sheet Thickness ◽  
Face Sheet ◽  
Sound Insulation ◽  
Honeycomb Sandwich ◽  
Theoretical Predictions ◽  
Core Thickness ◽  
Insulation Performance ◽  
Good Agreement

A theoretical model for calculating sound transmission loss (STL) of finite honeycomb sandwich panels is developed. The accuracy of the theoretical predictions is checked against experimental data, with good agreement achieved. Numerical analysis shows that increasing face sheet thickness can improve STL effectively, which is much more effective than increasing the core thickness. Core thickness and Youngs modulus of face sheet have evident effect on coincidence frequency, which should not be neglected when predicting STL.

Low Velocity Penetration Mechanical Behaviors of Aluminum Foam Sandwich Plates at Elevated Temperature

2015 ◽  
Vol 15 (04) ◽  
pp. 1450063 ◽  
Author(s):  
Huifeng Xi ◽  
Liqun Tang ◽  
Jilin Yu ◽  
Xiaoyang Zhang ◽  
Beixin Xie ◽  
...  
Keyword(s):  
Aluminum Foam ◽  
Failure Modes ◽  
Elevated Temperatures ◽  
Metal Foam ◽  
Peak Load ◽  
Low Velocity Impact ◽  
Sandwich Plates ◽  
Foam Core ◽  
Absorbed Energy ◽  
Low Velocity

This paper presents the low-velocity impact tests on the sandwich plates with aluminum foam core and aluminum skins at elevated temperatures. A furnace, attached to an Instron Dynatup 9250 HV drop hammer system, was designed to accomplish the penetration tests at temperatures up to 500°C. In order to process the experimental data accurately, the numerical vibration analysis was conducted to determine the threshold frequencies of the fast Fourier transform (FFT) filter for the original impact data. The experimental results showed that the failure modes of the sandwich, peak load and absorbed energy varied obviously with temperatures. Furthermore, the results showed that the failure modes of the top skin and metal foam core showed minor changes with respect to temperatures. Whereas the failure mode of the bottom skin and peak loads changed significantly with respect to temperatures. Also, the absorbed energy revealed a three-stage variation with the change of temperature.

Deformation and failure modes of aluminum foam-cored sandwich plates under air-blast loading

2021 ◽  
Vol 258 ◽  
pp. 113317
Author(s):  
Ying Li ◽  
Xianben Ren ◽  
Xiaoqiang Zhang ◽  
Yanfei Chen ◽  
Tian Zhao ◽  
...  
Keyword(s):  
Aluminum Foam ◽  
Failure Modes ◽  
Blast Loading ◽  
Sandwich Plates ◽  
Air Blast ◽  
Deformation And Failure ◽  
Air Blast Loading

BUCKLING OF CIRCULAR SANDWICH PLATES OF VARIABLE CORE THICKNESS AND FGM FACE SHEETS

2011 ◽  
Vol 11 (02) ◽  
pp. 273-295 ◽  
Author(s):  
S. K. JALALI ◽  
M. H. NAEI ◽  
A. POORSOLHJOUY
Keyword(s):  
Numerical Solutions ◽  
Volume Fraction ◽  
Sheet Thickness ◽  
Functionally Graded ◽  
Constant Thickness ◽  
Thickness Variation ◽  
Sandwich Plates ◽  
Radial Compression ◽  
Core Thickness ◽  
Circular Sandwich Plates

Presented herein is the buckling response of circular sandwich plates with a homogenous core of variable thickness and constant thickness functionally graded material (FGM) face sheets whose material properties are assumed to be graded in the thickness direction according to a simple power law. The plate is modeled using the first order shear deformation plate theory and subjected to a uniform radial compression. In order to determine the distribution of the prebuckling load along the radius, the membrane equation is solved using the shooting method. Subsequently, by employing the pseudospectral method that makes use of Chebyshev polynomials, the stability equations are solved numerically to evaluate the critical buckling load. Numerical solutions are presented for both clamped and simply supported plates and for linear and parabolic core thickness distributions. The results show that the buckling behavior is significantly influenced by the thickness variation profile, the aspect ratio, the volume fraction index, and the core-to-face sheet thickness ratio. Comparison studies demonstrate that the results obtained using the current method compare very well with those available in the literature.

Characterization of the vibration, stability and static responses of graphene-reinforced sandwich plates under mechanical and thermal loadings using the refined shear deformation plate theory

2021 ◽  
pp. 109963622199386
Author(s):  
Hessameddin Yaghoobi ◽  
Farid Taheri
Keyword(s):  
Shear Deformation ◽  
Volume Fraction ◽  
Plate Theory ◽  
Micromechanical Model ◽  
Sheet Thickness ◽  
Analytical Investigation ◽  
Sandwich Plates ◽  
Simply Supported ◽  
Vibration Stability ◽  
Shear Deformation Plate Theory

An analytical investigation was carried out to assess the free vibration, buckling and deformation responses of simply-supported sandwich plates. The plates constructed with graphene-reinforced polymer composite (GRPC) face sheets and are subjected to mechanical and thermal loadings while being simply-supported or resting on different types of elastic foundation. The temperature-dependent material properties of the face sheets are estimated by employing the modified Halpin-Tsai micromechanical model. The governing differential equations of the system are established based on the refined shear deformation plate theory and solved analytically using the Navier method. The validation of the formulation is carried out through comparisons of the calculated natural frequencies, thermal buckling capacities and maximum deflections of the sandwich plates with those evaluated by the available solutions in the literature. Numerical case studies are considered to examine the influences of the core to face sheet thickness ratio, temperature variation, Winkler- and Pasternak-types foundation, as well as the volume fraction of graphene on the response of the plates. It will be explicitly demonstrated that the vibration, stability and deflection responses of the sandwich plates become significantly affected by the aforementioned parameters.

Impact Analysis of Honeycomb Core Sandwich Panels

2020 ◽  
Author(s):  
Shah Alam ◽  
Damodar Khanal
Keyword(s):  
Sandwich Panels ◽  
Sheet Thickness ◽  
Composite Panel ◽  
Face Sheet ◽  
Impact Behavior ◽  
Front Face ◽  
Geometrical Parameters ◽  
Honeycomb Core ◽  
Back Face ◽  
The Impact

Abstract The goal of this paper is to analyze the impact behavior among geometrically different sandwich panels shown upon impact velocities. Initially, composite model with aluminum honeycomb core and Kevlar (K29) face sheets is developed in ABAQUS/Explicit and different impact velocities are applied. Keeping other parameters constant, model is simulated with T800S/epoxy face sheets. Residual velocities, energy absorption (%), and maximum deformation depth is calculated for sandwich panel for both models at five different velocities by executing finite element analysis. Once the better material is found for face sheets, process is extended by varying the ratio of front face sheet thickness to back face sheet thickness keeping other geometrical parameters constant to find the better geometry. Also, comparison of impact responses of sandwich composite panel on different ratio of front face sheet thickness to back face sheet thickness is done and validated with other results available in literature.

BENDING BEHAVIOR OF SIMPLY SUPPOTED METALLIC SANDWICH PLATES WITH DIMPLED CORES

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6179-6184 ◽  
Author(s):  
DAE-YONG SEONG ◽  
CHANG GYUN JUNG ◽  
DONG-YOL YANG ◽  
DONG GYU AHN
Keyword(s):  
High Precision ◽  
Sandwich Plate ◽  
Sheet Thickness ◽  
Radius Of Curvature ◽  
Sandwich Plates ◽  
Collapse Load ◽  
Forming Process ◽  
Simply Supported ◽  
Bending Behavior ◽  
Sandwich Core

Metallic sandwich plates are lightweight structural materials with load-bearing and multi-functional characteristics. Previous analytic studies have shown that the bendability of these plates increases as the thickness decreases. Due to difficulty in the manufacture of thin sandwich plates, dimpled cores (structures called egg-box cores) are employed as a sandwich core. High-precision dimpled cores are easily fabricated in a sectional forming process. The cores are then bonded with skin sheets by multi-point resistance welding. The bending characteristics of simply supported plates were observed by the defining measure, including the radius ratio of the small dimple, the thickness of a sandwich plate, and the pattern angle (0°/90°, 45°). Experimental results revealed that sandwich plates with a thickness of 2.2 mm and a pattern angle of 0°/90° showed good bendability as the punch stroke under a collapse load was longer than other cases. In addition, the gap between attachment points was found to be an important parameter for the improvement of the bendability. Finally, sandwich plates with dimpled cores were bent with a radius of curvature of 330 mm for the sheet thickness of 2.2 mm using an incremental bending apparatus.

scholarly journals Theoretical and Numerical Analysis of an Aluminum Foam Sandwich Structure

2020 ◽  
Vol 15 (3) ◽  
pp. 113-124
Author(s):  
Alaa Al-Fatlawi ◽  
Károly Jármai ◽  
György Kovács
Keyword(s):  
Sandwich Structure ◽  
Aluminum Foam ◽  
Face Sheet ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Design Variables ◽  
Reinforced Plastic ◽  
Size Constraints ◽  
Theoretical And Numerical Analysis ◽  
Composite Face

The aim of the research was to develop a new lightweight sandwich structure, which can be used for elements of air containers. The structure consists of aluminum foam core with fiber reinforced composite face-sheets. Nine different laminated glass or/and carbon fiber reinforced plastic face-sheet combinations were investigated. Finite element analysis of the sandwich structures was introduced. Single-objective optimization of the new sandwich structure was achieved for minimal weight. Five design constraints were considered: stiffness of the structure, face-sheet failure, core shear, face-sheet wrinkling, size constraints for design variables. The elaborated composite structure results significant weight savings due to low density.

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