Experimental tests and numerical modelling of wall sandwich panels

2012 ◽  
Vol 37 ◽  
pp. 193-204 ◽  
Author(s):  
Fabrizio Gara ◽  
Laura Ragni ◽  
Davide Roia ◽  
Luigino Dezi
Keyword(s):  
Numerical Modelling ◽  
Sandwich Panels ◽  
Experimental Tests

scholarly journals Flexural behavior of sandwich panels with cellular wood, plywood stiffener/foam and thermoplastic composite core

2017 ◽  
Vol 21 (2) ◽  
pp. 784-805 ◽  
Author(s):  
Edgars Labans ◽  
Kaspars Kalnins ◽  
Chiara Bisagni
Keyword(s):  
Mechanical Performance ◽  
Sandwich Panels ◽  
Experimental Tests ◽  
Design Tool ◽  
Thermoplastic Composite ◽  
Flexural Behavior ◽  
Four Point Bending ◽  
Reliable Design ◽  
Sufficient Strength ◽  
Core Part

A series of experimental tests have been carried out on three types of novel sandwich panels mainly designed for application in lightweight mobile housing. Two types of the panels are manufactured entirely from wood-based materials while the third one presents a combination of plywood for surfaces and corrugated thermoplastic composite as a core part. All sandwich panels are designed to allow rapid one-shot manufacturing. Mechanical performance has been evaluated in four-point bending comparing the data to the reference plywood board. Additionally, finite element simulations were performed to evaluate global behavior, stress distribution and provide the basis for a reliable design tool. Obtained results show sufficient mechanical characteristics suitable for floor and wall units. Compared to a solid plywood board, sandwich alternative can reach up to 42% higher specific stiffness, at the same time maintaining sufficient strength characteristics.

scholarly journals Sandwich Panels with Polymeric Foam Cores Exposed to Blast Loading: An Experimental and Numerical Investigation

2020 ◽  
Vol 10 (24) ◽  
pp. 9061
Author(s):  
Kristoffer Aune Brekken ◽  
Aase Reyes ◽  
Torodd Berstad ◽  
Magnus Langseth ◽  
Tore Børvik
Keyword(s):  
Shock Tube ◽  
Numerical Models ◽  
Sandwich Panels ◽  
Blast Loading ◽  
Experimental Tests ◽  
Quantitative Agreement ◽  
Low Velocity Impact ◽  
Blast Load ◽  
Low Velocity ◽  
Skin Deformation

Sandwich panels have proven to be excellent energy absorbents. Such panels may be used as a protective structure in, for example, façades subjected to explosions. In this study, the dynamic response of sandwich structures subjected to blast loading has been investigated both experimentally and numerically, utilizing a shock tube facility. Sandwich panels made of aluminium skins and a core of extruded polystyrene (XPS) with different densities were subjected to various blast load intensities. Low-velocity impact tests on XPS samples were also conducted for validation and calibration of a viscoplastic extension of the Deshpande-Fleck crushable foam model. The experimental results revealed a significant increase in blast load mitigation for sandwich panels compared to skins without a foam core, and that the back-skin deformation and the core compression correlated with the foam density. Numerical models of the shock tube tests were created using LS-DYNA, incorporating the new viscoplastic formulation of the foam material. The numerical models were able to capture the trends observed in the experimental tests, and good quantitative agreement between the experimental and predicted responses was in general obtained. One aim of this study is to provide high-precision experimental data, combined with a validated numerical modelling strategy, that can be used in simulation-based optimisation of sandwich panels exposed to blast loading.

An Experimental Testing of Fillet Welded Specimens

2015 ◽  
Vol 752-753 ◽  
pp. 412-417 ◽  
Author(s):  
Martin Krejsa ◽  
Jiri Brozovsky ◽  
David Mikolasek ◽  
Premysl Parenica ◽  
Libor Zidek ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Stress Analysis ◽  
Numerical Models ◽  
Experimental Testing ◽  
Fem Analysis ◽  
Experimental Tests ◽  
Strength Characteristics ◽  
Fillet Welds ◽  
Commercial Software

The paper describes the experimental tests of steel bearing elements, which were aimed at obtaining material, geometric and strength characteristics of the fillet welds. Preparation of experiment consisted in defining of numerical models of tested samples using FEM analysis and the commercial software ANSYS. Data obtained from described experimental tests are necessary for further numerical modelling of stress analysis of steel structural supporting elements.

Impact and close-in blast response of auxetic honeycomb-cored sandwich panels: Experimental tests and numerical simulations

2017 ◽  
Vol 180 ◽  
pp. 161-178 ◽  
Author(s):  
Chang Qi ◽  
Alex Remennikov ◽  
Lian-Zheng Pei ◽  
Shu Yang ◽  
Zhi-Hang Yu ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Sandwich Panels ◽  
Experimental Tests ◽  
Blast Response

Mathematical models and experimental data for HDF based sandwich panels with dual corrugated lightweight core

Holzforschung ◽  
2017 ◽  
Vol 71 (3) ◽  
pp. 265-273 ◽  
Author(s):  
Jerzy Smardzewski ◽  
Dorota Jasińska
Keyword(s):  
Homogeneous Model ◽  
Sandwich Panels ◽  
Experimental Tests ◽  
Strength Properties ◽  
Modulus Of Rupture ◽  
Experimental Investigations ◽  
Calculation Results ◽  
Orthotropic Properties ◽  
Auxetic Structure ◽  
Lightweight Core

Abstract Light layer honeycomb panels could replace traditional wood materials, if their stiffness and strength properties could be improved. The aim of this research was to design and determine elastic properties of sandwich panels (SPs) based on a dual corrugated HDF core. Stiffness matrix values of elements were determined by a numerical method. The 3D calculation results were compared with those of the homogeneous model. The calculation results were collated with those of experimental investigations. It was demonstrated that the linear elasticity modulus as well as the modulus of rupture of the SPs were comparable with mechanical properties of a particle board with identical thickness, while the SP has a 1/3 lower density. The panel core exhibited significant orthotropic properties. In the xy plane it could be characterized as an auxetic structure. The homogeneous model leads to results similar to those achieved from the 3D model and observed in experimental tests.

Glass beams reinforced with GFRP laminates: Experimental tests and numerical modelling using a discrete strong discontinuity approach

2015 ◽  
Vol 99 ◽  
pp. 253-263 ◽  
Author(s):  
P. Neto ◽  
J. Alfaiate ◽  
L. Valarinho ◽  
J.R. Correia ◽  
F.A. Branco ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Experimental Tests ◽  
Strong Discontinuity

scholarly journals Mechanical properties of sandwich panels constructed from polystyrene/cement mixed cores and thin cement sheet facings

2015 ◽  
Vol 19 (4) ◽  
pp. 456-481 ◽  
Author(s):  
Hamid Reza Tabatabaiefar ◽  
Bita Mansoury ◽  
Mohammad Javad Khadivi Zand ◽  
Daniel Potter
Keyword(s):  
Mechanical Properties ◽  
Ultimate Strength ◽  
Mechanical Behaviour ◽  
Modulus Of Elasticity ◽  
Sandwich Panel ◽  
Sandwich Panels ◽  
Experimental Tests ◽  
Practical Applications ◽  
Building Components ◽  
Cement Board

Sandwich panels are made of two materials that are relatively weak in their separated state, but are improved when they are constructed together in a sandwich panel. Sandwich panels can be used for almost any section of a building including roofs, walls and floors. These building components are regularly required to provide insulation properties, weatherproofing properties and durability in addition to providing structural load bearing characteristics. Polystyrene/cement mixed cores and thin cement sheet facings sandwich panels are Australian products made of cement-polystyrene beaded mixture encapsulated between two thick cement board sheets. The structural properties of sandwich panels constructed of polystyrene/cement cores and thin cement sheet facings are relatively unknown. Therefore, in this study, to understand the mechanical behaviour and properties of those sandwich panels, a series of experimental tests have been performed and the outcomes have been explained and discussed. Based on the results of this study, values for modulus of elasticity and ultimate strength of the sandwich panels in dry and saturated conditions have been determined and proposed for practical applications.

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