The crashworthiness performance of integrally woven sandwich composite panels made using natural and glass fibers

As a way to save petroleum resources, considerable efforts were made in the last three decades to develop green composites. Green composites are a category of composite materials in which at least one phase (reinforcement or matrix) is made from renewable resources. An attempt was made to present a simple fabrication process to produce hollow integrally woven sandwich composites. In addition, the potential of jute fibers to be utilized as piles in the core of an integrally woven sandwich composite was assessed and compared to the counterparts made using glass fibers. The crashworthiness performances of integrally woven sandwich composite samples considering the effect of relative density, pile material and the presence of polyurethane foam were investigated through performing quasi-static flat-wise compression tests. Based on the findings, the foam-filled integrally woven sandwich composites exhibited stable compression load-displacement response and better energy absorption properties over pure foam, which make them appropriate for automobile interior components. Moreover, a computational cost-efficient finite element modeling was presented and subsequently validated with experimental results.

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Micromechanical modelling of the compression strength of three-dimensional integrated woven sandwich composites

Journal of Industrial Textiles ◽

10.1177/1528083718764909 ◽

2018 ◽

Vol 48 (9) ◽

pp. 1399-1419 ◽

Cited By ~ 3

Author(s):

Abolfazl Mirdehghan ◽

Hooshang Nosraty ◽

Mahmood M Shokrieh ◽

Roohallah Ghasemi ◽

Mehdi Akhbari

Keyword(s):

Compression Strength ◽

Micromechanical Model ◽

Three Dimensional ◽

Analytical Models ◽

Sandwich Composite ◽

Composite Panels ◽

Sandwich Composites ◽

Compression Tests ◽

Special Configuration ◽

Proposed Model

This paper is concerned with a theoretical and experimental verification of a micromechanical model of newly developed sandwich panels denoted as 3D integrated woven sandwich composite panels. The integrated hollow core was made of a pile of 3D bars with a special configuration. Integrated woven sandwich composite panels consist of two fabric faces which were interwoven by pile fibers and therefore a very high skin core debonding resistance was obtained. With the objective of qualifying the mechanical properties of these structures, fairly extensive experimental research was carried out by investigators. Although some numerical methods have been developed to predict the mechanical behaviors of these structures, there are less analytical models in this area. Due to the computational difficulties and the time consuming nature of the finite element method, in the present study, a new micromechanics analytical model has been suggested for predicting the compressive strength of integrated woven sandwich composites. In order to evaluate the proposed model, fabricated samples with different pile heights and pile distribution densities were subjected to flatwise compression tests. The results show that compressive properties of integrated woven sandwich composite panels are decreased with the increase of core heights and increased greatly with that of the pile density. Furthermore, the micromechanics model reasonably predicted the compression strength, and there is a good agreement between the experimental data and model predictions.

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Mechanical properties of new-manufactured sandwich composite having carbon fiber core

Journal of Composite Materials ◽

10.1177/0021998318810899 ◽

2018 ◽

Vol 53 (22) ◽

pp. 3093-3109 ◽

Cited By ~ 1

Author(s):

Burak Kiyak ◽

Mete O Kaman

Keyword(s):

Mechanical Properties ◽

Carbon Fiber ◽

Peak Load ◽

Density Ratio ◽

Sandwich Composite ◽

Failure Behavior ◽

Sandwich Composites ◽

Compression Tests ◽

Fiber Core ◽

Finite Element Software

In this study, mechanical properties of new-manufactured sandwich composites with various cell structures, having carbon fiber core have been investigated both numerically and experimentally. Three-point bending and compression tests are applied to the specimens as the experimental test approach. Failure behavior and strength of the specimens are extracted as a result of the measurements. The test results also give the opportunity to find out the optimum peak load/density ratio of various core types of sandwich composites. The commercial finite element software ANSYS has been used for numerical analysis. It should be remarked that a good agreement between numerical and experimental results is obtained. The cell shape and height are important parameters on peak load for bending. Additionally, change of cell density is a parameter having effect in same proportion for bending and compression peak loads for these type composites.

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Experimental Investigation on Dynamic Characteristics of Polypropylene Honeycomb Sandwich Structures under the Influences of Different Temperatures

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.606.153 ◽

2014 ◽

Vol 606 ◽

pp. 153-157

Author(s):

P. Nagasankar ◽

S. Balasivanandha Prabu ◽

Velmurugan Ramachandran ◽

R. Paskaramoorthy

Keyword(s):

Experimental Investigation ◽

Thermal Properties ◽

Dynamic Characteristics ◽

Loss Factor ◽

Glass Fibers ◽

Sandwich Composite ◽

Sandwich Composites ◽

Honeycomb Sandwich ◽

Different Temperatures ◽

Half Power

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 different for these orientations. A two stage layup technique has been used to fabricate the sandwich composite specimens. Impulse technique associated with the half power bandwidth method, has been used to evaluate the natural frequency and damping values of the sandwich composite under different temperatures.

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Load Distribution on PET-G 3D Prints of Honeycomb Cellular Structures under Compression Load

Polymers ◽

10.3390/polym13121983 ◽

2021 ◽

Vol 13 (12) ◽

pp. 1983

Author(s):

Olimpia Basurto-Vázquez ◽

Elvia P. Sánchez-Rodríguez ◽

Graham J. McShane ◽

Dora I. Medina

Keyword(s):

Fused Deposition Modeling ◽

Structural Characteristics ◽

Honeycomb Structure ◽

Cellular Structures ◽

Displacement Curve ◽

Compression Tests ◽

Compression Load ◽

Fused Deposition ◽

3D Printed ◽

Printing Direction

Energy resulting from an impact is manifested through unwanted damage to objects or persons. New materials made of cellular structures have enhanced energy absorption (EA) capabilities. The hexagonal honeycomb is widely known for its space-filling capacity, structural stability, and high EA potential. Additive manufacturing (AM) technologies have been effectively useful in a vast range of applications. The evolution of these technologies has been studied continuously, with a focus on improving the mechanical and structural characteristics of three-dimensional (3D)-printed models to create complex quality parts that satisfy design and mechanical requirements. In this study, 3D honeycomb structures of novel material polyethylene terephthalate glycol (PET-G) were fabricated by the fused deposition modeling (FDM) method with different infill density values (30%, 70%, and 100%) and printing orientations (edge, flat, and upright). The effectiveness for EA of the design and the effect of the process parameters of infill density and layer printing orientation were investigated by performing in-plane compression tests, and the set of parameters that produced superior results for better EA was determined by analyzing the area under the curve and the welding between the filament layers in the printed object via FDM. The results showed that the printing parameters implemented in this study considerably affected the mechanical properties of the 3D-printed PET-G honeycomb structure. The structure with the upright printing direction and 100% infill density exhibited an extension to delamination and fragmentation, thus, a desirable performance with a long plateau region in the load–displacement curve and major absorption of energy.

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Computational Cost Efficient Model of Losses for Multi-port Active-bridge Converters

2020 IEEE Energy Conversion Congress and Exposition (ECCE) ◽

10.1109/ecce44975.2020.9236119 ◽

2020 ◽

Author(s):

Soleiman Galeshi ◽

David Frey ◽

Yves Lembeye

Keyword(s):

Computational Cost ◽

Cost Efficient

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Damage behavior of potting materials in sandwich composites with pinned joints

Science and Engineering of Composite Materials ◽

10.1515/secm-2013-0176 ◽

2015 ◽

Vol 22 (5) ◽

Cited By ~ 1

Author(s):

Cesim Atas ◽

Alper Basmaci

Keyword(s):

Core Material ◽

Sandwich Composite ◽

Composite Panels ◽

Sandwich Composites ◽

Resin Infusion ◽

Damage Behavior ◽

Mechanical Joints ◽

The Core ◽

Bottom Face ◽

Infusion Technique

AbstractThe damage behavior of the potting materials around a pinhole, being used in the mechanical joints of sandwich composites, is investigated experimentally. The sandwich composite panels used in the tests were manufactured by the vacuum-assisted resin infusion technique. Each of the top and bottom face sheets of the panels consisted of two woven E-glass/epoxy layers. As the core material, PVC foam (AIREX

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Flexural properties of sandwich composite laminates reinforced with glass and carbon Z-pins

Journal of Composite Materials ◽

10.1177/0021998318800146 ◽

2018 ◽

Vol 53 (10) ◽

pp. 1347-1359 ◽

Cited By ~ 6

Author(s):

Erdem Selver ◽

Gaye Kaya

Keyword(s):

Carbon Fibre ◽

Composite Laminates ◽

Interfacial Bonding ◽

Sandwich Composite ◽

Flexural Properties ◽

Sandwich Composites ◽

Flexural Behaviour ◽

Face Type ◽

Carbon Rods ◽

Glass Rods

This study aims to enhance the flexural properties of sandwich composites made from glass or carbon face and glass and carbon fibre Z-pin inserted extruted-polystyrene (XPS) foam cores. Carbon and glass pins were placed through XPS foams with two different column and row densities (15 and 30 mm). Results indicated that flexural loads, strength and modulus of glass/XPS and carbon/XPS sandwich composites significantly increased after inserting of glass and carbon rods. Core shear strengths and facing stresses of glass/XPS and carbon/XPS increased by increasing of carbon or glass rod densities. The rod type, rod density and face type of the sandwich composites are considered as significant parameters which affect the flexural behaviour of sandwich composites while using carbon rods enhanced flexural properties more than that of using glass rods due to better interfacial bonding.

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Impact Properties of Aluminum Foam – Nanosilica Filled Basalt Fiber Reinforced Polymer Sandwich Composites

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.11.15934 ◽

2018 ◽

Vol 7 (3.11) ◽

pp. 77

Author(s):

Nurul Emi Nor Ain Mohammad ◽

Aidah Jumahat ◽

Mohamad Fashan Ghazali

Keyword(s):

Energy Absorption ◽

Basalt Fiber ◽

Sandwich Composite ◽

Sandwich Composites ◽

Basalt Fibre ◽

Reinforced Polymer ◽

Closed Cell ◽

The Face ◽

Al Foam ◽

Fibre Reinforced Polymer

This paper investigates the effect of nanosilica on impact and energy absorption properties of sandwich foam-fibre composites. The materials used in this study are closed-cell aluminum (Al) foam (as the core material) that is sandwiched in between nanomodified basalt fiber reinforced polymer (as the face-sheets). The face sheets were made of Basalt Fibre, nanosilica and epoxy polymer matrix. The sandwich composite structures are known to have the capability of resisting impact loads and good in absorbing energy. The objective of this paper is to determine the influence of closed-cell aluminum foam core and nanosilica filler on impact properties and fracture behavior of basalt fibre reinforced polymer (BFRP) sandwich composites when compared to the conventional glass fibre reinforced polymer (GFRP) sandwich composites. The drop impact tests were carried out to determine the energy absorbed, peak load and the force-deflection behaviour of the sandwich composite structure material. The results showed that the nanomodified BFRP-Al foam core sandwich panel exhibited promising energy absorption properties, corresponding to the highest specific energy absorption value observed. Also, the result indicates that the Aluminium Foam BFRP sandwich composite exhibited higher energy absorption when compared to the Aluminium foam GFRP sandwich composite.

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