A methodology for improving shear performance of marine grade sandwich composites: Sandwich composite panel with shear key

2010 ◽  
Vol 92 (5) ◽  
pp. 1065-1072 ◽  
Author(s):  
Nilanjan Mitra
Keyword(s):  
Composite Panel ◽  
Sandwich Composite ◽  
Sandwich Composites ◽  
Shear Key ◽  
Shear Performance

scholarly journals Fire-Resistant Sandwich-Structured Composite Material Based on Alternative Materials and Its Physical and Mechanical Properties

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1432 ◽  
Author(s):  
Štěpán Hýsek ◽  
Miroslav Frydrych ◽  
Miroslav Herclík ◽  
Petr Louda ◽  
Ludmila Fridrichová ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Sandwich Panel ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Composite Panel ◽  
Sandwich Composite ◽  
Fibre Reinforcement ◽  
Sandwich Composites ◽  
Basalt Fibre

The development of composite materials from alternative raw materials, and the design of their properties for the intended purpose is an integral part of the rational management of raw materials and waste recycling. The submitted paper comprehensively assesses the physical and mechanical properties of sandwich composite material made from particles of winter rapeseed stalks, geopolymer and reinforcing basalt lattices. The developed composite panel is designed for use as a filler in constructions (building or building joinery). The observed properties were: bending characteristics, internal bonding, thermal conductivity coefficient and combustion characteristics. The results showed that the density of the particleboard has a significant effect on the resulting mechanical properties of the entire sandwich panel. On the contrary, the density of the second layer of the sandwich panel, geopolymer, did not have the same influence on its mechanical properties as the density of the particleboard. The basalt fibre reinforcement lattice positively affected the mechanical properties of sandwich composites only if it was sufficiently embedded in the structure of the particle board. All of the manufactured sandwich composites resisted flame for more than 13 min and the fire resistance was positively affected by the density of the geopolymer layer.

Damage behavior of potting materials in sandwich composites with pinned joints

2015 ◽  
Vol 22 (5) ◽  
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

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

2018 ◽  
Vol 53 (10) ◽  
pp. 1347-1359 ◽  
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.

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

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.  

Monotonic Behaviors of Steel Frames with Sandwich Composite Panel Infills: Theoretical and Numerical

2012 ◽  
Vol 193-194 ◽  
pp. 1424-1428
Author(s):  
Miao Liu ◽  
Yan Fei Sun ◽  
C.X. Qiu ◽  
He Tao Hou
Keyword(s):  
Structural Engineering ◽  
Theoretical Study ◽  
Numerical Models ◽  
Steel Frames ◽  
Composite Panel ◽  
Sandwich Composite ◽  
Actual Structure ◽  
Equivalent Strut ◽  
Cross Section Area ◽  
Section Area

Abstract: Analysis of infilled frames is one of the most complicated problems in the structural engineering field. This complication is mainly attributed to the existence of the variety and complex of the infills and the difficulty in modeling the infill-frames interaction. In the present paper, with the aim to study the integral behavior of the single-story single-bay steel frames with sandwich composite panel infills, a proper computational model (the panel is simplified into an equivalent pin-jointed diagonal strut) is proposed. In the theoretical study, both of the panels and steel frames are assumed to be in the linear elastic state for simplicity’s sake, and then the cross-section area of the equivalent strut is obtained by imposing the initial lateral stiffness of actual structure equal to that of simplified model. As a support of the discussion, several numerical models under monotonic lateral loadings are performed by software ABAQUS, in order to verify the theoretical analysis. Finally, results from theoretical study and numerical modeling are compared, which give a satisfactory correlation between them.

scholarly journals Tensile Behaviour of Pultruded FRP Sandwich Composite Bolted Joints

1994 ◽  
Vol 3 (3) ◽  
pp. 096369359400300
Author(s):  
S. Ramakrishna ◽  
H. Hamada ◽  
H. Naito
Keyword(s):  
Experimental Study ◽  
Glass Fibre ◽  
Joint Strength ◽  
Bolted Joints ◽  
Specimen Geometry ◽  
Sandwich Composite ◽  
Tensile Behaviour ◽  
Sandwich Composites ◽  
Glass Fibre Reinforced

In this experimental study, the tensile behaviour of bolted joints of pultruded glass fibre reinforced polyester sandwich composites was investigated. The transverse specimens cut normal to the pultrusion direction failed by net-tension whereas the longitudinal specimens cut parallel to the pultrusion direction failed by a combination of bearing and shear-out modes. The joint strength was dependent on the specimen geometry in the case of transverse specimens whereas it was not in the case of longitudinal specimens.

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

2020 ◽  
pp. 002199832096484
Author(s):  
Tohid Dastan ◽  
Aida Safian ◽  
Mohammad Sheikhzadeh
Keyword(s):  
Glass Fibers ◽  
Computational Cost ◽  
Sandwich Composite ◽  
Sandwich Composites ◽  
Green Composites ◽  
Compression Tests ◽  
Compression Load ◽  
Petroleum Resources ◽  
Cost Efficient ◽  
Composite Samples

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.

Experimental and analytical behavior of sandwich composite beams: Comparison of natural and synthetic materials

2016 ◽  
Vol 20 (3) ◽  
pp. 287-307 ◽  
Author(s):  
Pedram Sadeghian ◽  
Dimo Hristozov ◽  
Laura Wroblewski
Keyword(s):  
Composite Beams ◽  
Bending Test ◽  
Synthetic Fiber ◽  
Sandwich Composite ◽  
Flexural Stiffness ◽  
Fiber Types ◽  
Shear Rigidity ◽  
Sandwich Composites ◽  
Core Materials ◽  
Natural And Synthetic

In this study, the flexural behavior of sandwich composite beams made of fiber-reinforced polymer (FRP) skins and light-weight cores are studied. The focus is on the comparison of natural and synthetic fiber and core materials. Two types of fiber materials, namely glass and flax fibers, as well as two types of core materials, namely polypropylene honeycomb and cork, are considered. A total of 105 small-scale sandwich beam specimens (50 mm wide) were prepared and tested under four-point bending. Test parameters were fiber types (flax and glass fibers), core materials (cork ad honeycomb), skin layers (0, 1, and 2 layers), core thicknesses (6–25 mm), and beam spans (150 and 300 mm). The load–deflection behavior, peak load, initial stiffness, and failure mode of the specimens are evaluated. Moreover, the flexural stiffness, shear rigidity, and core shear modulus of the sandwich composites are computed based on the test results of the two spans. An analytical model is also implemented to compute the flexural stiffness, core shear strength, and skin normal stress of the sandwich composites. Overall, the natural fiber and cork materials showed a promising and comparable structural performance with their synthetic counterparts.

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