Local and global response of sandwich beams made of GFRP facings and PET foam core in three point bending test

2020 ◽  
Vol 241 ◽  
pp. 112122 ◽  
Author(s):  
Łukasz Pyrzowski ◽  
Bartosz Sobczyk
Keyword(s):  
Bending Test ◽  
Foam Core ◽  
Sandwich Beams ◽  
Global Response ◽  
Three Point Bending

scholarly journals Bending Behavior of Lightweight Wood-Based Sandwich Beams with Auxetic Cellular Core

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1723 ◽  
Author(s):  
Krzysztof Peliński ◽  
Jerzy Smardzewski
Keyword(s):  
Mechanical Properties ◽  
Experimental Studies ◽  
Numerical Calculations ◽  
Bending Test ◽  
Dissipated Energy ◽  
Sandwich Beams ◽  
Wood Composites ◽  
Three Point Bending ◽  
Good Ability ◽  
Bending Behavior

The work concerns a three-point bending test of beams made of plywood, high density fibre boards, cardboard, and wood-epoxy mass. The goal of the investigation was to determine the effect of thickness and type of wood-based facings on stiffness, strength, ability to absorb, and dissipate the energy of sandwich beams with an auxetic core. The cognitive goal of the work was to demonstrate the possibility of using recycled materials for facings and cores instead of popular wood composites. Experimental studies and numerical calculations were performed on correctly calibrated models. Experimental studies have shown that the beams with HDF facings (E = 1528 MPa, MOR = 12.61 MPa) and plywood facings (E = 1248–1395 MPa, MOR = 8.34–10.40 MPa) have the most favourable mechanical properties. Beams with plywood facings also have a good ability to absorb energy (1.380–1.746 J), but, in this respect, the beams manufactured of HDF (2.223 J) exhibited better capacity. The use of an auxetic core and facings of plywood and cardboard significantly reduces the amount of dissipated energy (0.0093 J, 0.0067 J). Therefore, this type of structures can be used for modeling beams carrying high deflections.

Improving four-point bending performance of marine composite sandwich beams by core modification

2020 ◽  
Vol 54 (8) ◽  
pp. 1049-1066
Author(s):  
F Balıkoğlu ◽  
N Arslan ◽  
TK Demircioğlu ◽  
O İnal ◽  
M İren ◽  
...  
Keyword(s):  
Bending Strength ◽  
Mechanical Performance ◽  
Composite Beams ◽  
Bending Stiffness ◽  
Bending Test ◽  
Sandwich Composite ◽  
Foam Core ◽  
Sandwich Beams ◽  
Bending Performance ◽  
Four Point Bending

The aim of this study was to improve four-point bending performance of foam core sandwich composite beams by applying various core machining configurations. Sandwich composites have been manufactured using perforated and grooved foam cores by vacuum-assisted resin transfer moulding method with vinyl-ester resin system. The influence of grooves and perforations on the mechanical performance of marine sandwich composite beams was investigated under four-point bending test considering the weight gain. Bending strength and effective bending stiffness increased up to 34% and 61%, respectively, in comparison to a control beam without core modification. Analytical equations were utilised for calculating the mid-span deflection, equivalent bending stiffness and ultimate bending strength of the sandwich beams. Finite element analysis was also performed to analyse the flexural response of the specimens taking into account the combined effect of orthotropic linear elasticity of the face sheet and the non-linear behaviour of the foam core.

Bending Strength of Sandwich Beams with Nanocomposites Core

2009 ◽  
Vol 79-82 ◽  
pp. 577-580 ◽  
Author(s):  
Meng Kao Yeh ◽  
Chia Min Lin
Keyword(s):  
Bending Strength ◽  
Musical Instrument ◽  
Bending Test ◽  
Core Material ◽  
Sandwich Beams ◽  
Three Point Bending ◽  
Specific Strength ◽  
The Face ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Composite materials, having advantages of high specific strength, high specific stiffness, are used in many applications, such as musical instrument, acoustical tile, fire wall, sports equipment, aerospace and vehicle industries. Composite products in the form of sandwich structures are specifically useful in recent years. In this paper, the bending strength of sandwich structure made by graphite/epoxy face laminates and core material made by multi-walled carbon nanotubes (MWNTs) reinforced polymer was investigated experimentally. In experiment, the three-point bending test was performed to measure the bending properties of sandwich beams. The influences of fiber orientation in the face laminates and MWNTs content in polymer reinforced nanocomposite core material on the bending strength of sandwich beams were discussed in this paper. The failure mechanism of sandwich beams with various fiber orientations in the face laminates was also discussed.

Static and dynamic responses of a novel Al nanocomposite foam/sandwich structure under bending, impact and quasi-static compression tests

2017 ◽  
Vol 21 (4) ◽  
pp. 1406-1427
Author(s):  
SM Hosseini ◽  
A Habibolahzadeh ◽  
J Němeček
Keyword(s):  
Silicon Carbide ◽  
Sandwich Structure ◽  
Metallic Matrix ◽  
Bending Test ◽  
Foam Core ◽  
Static Compression ◽  
Three Point Bending ◽  
Silicon Carbide Nanoparticles ◽  
Nanocomposite Foam ◽  
Quasi Static Compression

The aim of this study is to analyze mechanical properties of a new Al sandwich structure with a foam core reinforced by 0.75 wt% silicon carbide nanoparticles. The reinforced core as the main component of the sandwich structure is examined by nanoindentation, quasi-static compression, impact and three-point bending tests. The behavior of the nanocomposite foam core sandwiched with AA3103 facing sheets is also analyzed under three-point bending test. The results showed that the silicon carbide nanoparticles play an important role in enhancing the Young’s modulus and hardness of the metallic matrix, static compressive strength, energy absorption of the foam core as well as load carrying capacity and maximum deflection of the sandwich structure. However, they have no significant influence on the morphological features, impact and bending properties of the foam core. The effectiveness of the silicon carbide nanoparticles was dependent on the dominant deformation mode and failure mechanism of specimens under the applied loadings.

The Failure Behavior of Geometrically Asymmetric Metal Foam Core Sandwich Beams Under Three-Point Bending

2014 ◽  
Vol 81 (7) ◽  
Author(s):  
Jianxun Zhang ◽  
Qinghua Qin ◽  
Weilong Ai ◽  
Huimin Li ◽  
T. J. Wang
Keyword(s):  
Failure Mechanism ◽  
Failure Modes ◽  
Metal Foam ◽  
Minimum Weight ◽  
Failure Behavior ◽  
Foam Core ◽  
Sandwich Beams ◽  
Three Point Bending ◽  
Initial Failure ◽  
Core Height

The failure behavior of geometrically asymmetric sandwich beams with a metal foam core is analytically and experimentally investigated. New initial failure modes of the asymmetric sandwich beams are observed under three-point bending, i.e., face yield, face wrinkling, core shear A, core shear AB, core shear A-AB, and indentation. It is shown that the initial failure modes of sandwich beams depend on the span of the beam, the thicknesses of top and bottom face sheets, core height and material properties. We derived the analytical formulae for the initial failure loads and then constructed the initial failure mechanism maps for the geometrically asymmetric sandwich beams. It is shown that the analytically predicted initial failure mechanism maps are in good agreement with the experimental results, which are clearly different from the symmetric sandwich beams. As a preliminary application, the minimum weight designs are presented for asymmetric metal sandwich beams.

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