Silicone/Carbon Nanotube Sheet Biofidelic Piezoresistive Sandwich Composites

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Nengda Jiang ◽  
Sirish Namilae ◽  
Vinu Unnikrishnan
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Polymeric Materials ◽  
Analytical Models ◽  
Sandwich Composite ◽  
Sandwich Composites ◽  
Human Brain Tissue ◽  
Electrically Conductive ◽  
The Core ◽  
Electromechanical Performance

Abstract Silicone-based biofidelic surrogates are used in many biomedical applications. Apart from mimicking the mechanical behavior of bodily tissues, there is an increasing requirement for these materials to be electrically conductive and piezoresistive to facilitate direct instrumentation. Carbon nanotubes (CNTs) have been extensively investigated as fillers to impart electrical conductivity and piezoresistivity to polymeric materials including silicone. In this paper, we fabricate, test, and characterize a two-part silicone/CNT sheet sandwich composites that exhibit conductivity, piezoresistivity, and biofidelic with mechanical properties corresponding to that of the white matter of human brain tissue. The electromechanical performance of the sandwich composite improves in subsequent loading after the core fracture during initial loading. Analytical models developed for discontinuous core sandwich structures are used to analyze and explain the experimental results. The results indicate the potential for using this discontinuous core biofidelic-piezoresistive sandwich nanocomposite for biomedical applications without deploying external deformation sensors.

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

Researches Concerning Structural and Mechanical Behavior of Sandwich Composite Polymeric Products

2012 ◽  
Vol 498 ◽  
pp. 151-160 ◽  
Author(s):  
Constantin Gheorghe OPRAN ◽  
Cătălina Bivolaru ◽  
Diana Murar
Keyword(s):  
Mechanical Behavior ◽  
Structural Behavior ◽  
Sandwich Composite ◽  
Flexural Stiffness ◽  
Constant Force ◽  
Sandwich Composites ◽  
Fiber Glass ◽  
The Core ◽  
Weight Saving ◽  
Specific Factors

The sandwich composite polymeric products have a wide utilization in various fileds like aircraft and automotive construction, load bearing structures, sports equipment, more specifically, wherever weight-saving is required. Sandwich composites polymeric products represent excellent examples of the potential offered by composite materials. The combination of two composite faces and a lightweight polystyrene core allows obtaining a high flexural stiffness with a weak mass. This paper deals with the analysis of the structural and mechanical behavior properties of the core, adhesive and faces, for sandwich composite polymeric products. There are also presented the investigation results on how different specific factors like: mechanical and structural behavior, interface between the faces and core, constant force resistance in time, the reinforcing elements (fiber glass), the polyester core do influence the machinability of sandwich composites polymeric products..

Sandwich Composites of Glass Fibre Panel and Polyurethane/Coconut Coir Foam Core (GFRP - PUC)

2011 ◽  
Vol 471-472 ◽  
pp. 391-396 ◽  
Author(s):  
M.A. Azmi ◽  
Hasan Zuhudi Abdullah ◽  
Maizlinda Izwana Idris
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Glass Fibre ◽  
Adhesive Bonding ◽  
Physical And Mechanical Properties ◽  
Sandwich Composite ◽  
Sandwich Composites ◽  
Flexural Testing ◽  
Glass Fibre Reinforced ◽  
Coconut Coir

In this work, sandwich composite properties were investigated by addition of coconut coir (CC). Fibres in the polyurethane foam cores ranges from 0 to 20 wt.%. Glass fibre reinforced epoxy panels were used as a skin and polyurethane foam as a core, these materials adhesively bonded to keep the whole structure attached with each other. Sandwich composite skins and core-skin bonding were attained via adhesive bonding technique. While polyurethane foam reinforced by coconut coir fibres were manufactured by using one shot process and polyurethane moulding method. Sandwich composite panels with different coir fibres compositions were subjected to the density test, weight per area test and flexural testing in order to investigate their physical and mechanical properties. From the experimental results and analysis, it was found that the sandwich composites with 10 wt.% of coir fibres offer higher mechanical properties.

scholarly journals Graphene-based polymeric nano-composites: an introspection into functionalization, processing techniques and biomedical applications

2019 ◽  
Vol 9 (3) ◽  
pp. 3926-3933 ◽  
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Scientific Community ◽  
Polymeric Materials ◽  
Biomedical Domain ◽  
Polymeric Nanocomposites ◽  
Polymeric Matrices ◽  
Functional Capabilities ◽  
Superior Mechanical Properties ◽  
Processing Techniques

Although, there have been numerous efforts in synthesis of polymers, their mechanical properties have limited their applications. Graphene has been investigated for excellent properties such as superior mechanical properties, high thermal conductivity that has attracted the attention of scientific community to employ graphene as a filler material in polymeric matrices to form composites with multi-functional capabilities. The excellent properties possessed by Graphene has motivated users to fabricate flexible nanocomposites that can be used for applications requiring superior mechanical, chemical and thermal performances. Characteristics of both the components if explored synergistically through proper structural and interfacial organization. The investigation in this direction has resulted into combination of graphene with variety of polymeric materials and hence the development of different graphene-based nanocomposites. The present work reviews the application of graphene-based nanocomposites in the biomedical domain. With this objective, the polymeric matrices suitable for biomedical applications as well as the techniques of producing graphene polymeric nanocomposites have been discussed. Finally the application particularly in biosensing, wound healing and drug delivery system has been discussed.

scholarly journals Additive Manufactured Sandwich Composite/ABS Parts for Unmanned Aerial Vehicle Applications

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1262 ◽  
Author(s):  
Athanasios Galatas ◽  
Hany Hassanin ◽  
Yahya Zweiri ◽  
Lakmal Seneviratne
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Mechanical Strength ◽  
Sandwich Composite ◽  
Fused Deposition Modelling ◽  
Core Density ◽  
Specific Strength ◽  
Fused Deposition ◽  
The Core ◽  
The Poor

Fused deposition modelling (FDM) is one of most popular 3D printing techniques of thermoplastic polymers. Nonetheless, the poor mechanical strength of FDM parts restricts the use of this technology in functional parts of many applications such as unmanned aerial vehicles (UAVs) where lightweight, high strength, and stiffness are required. In the present paper, the fabrication process of low-density acrylonitrile butadiene styrenecarbon (ABS) with carbon fibre reinforced polymer (CFRP) sandwich layers for UAV structure is proposed to improve the poor mechanical strength and elastic modulus of printed ABS. The composite sandwich structures retains FDM advantages for rapid making of complex geometries, while only requires simple post-processing steps to improve the mechanical properties. Artificial neural network (ANN) was used to investigate the influence of the core density and number of CFRP layers on the mechanical properties. The results showed an improvement of specific strength and elastic modulus with increasing the number of CFRP. The specific strength of the samples improved from 20 to 145 KN·m/kg while the Young’s modulus increased from 0.63 to 10.1 GPa when laminating the samples with CFRP layers. On the other hand, the core density had no significant effect on both specific strength and elastic modulus. A case study was undertaken by applying the CFRP/ABS/CFRP sandwich structure using the proposed method to manufacture improved dual-tilting clamps of a quadcopter UAV.

Influence of Panel Density on the Shear and Peel Property of Sandwich Composites

2014 ◽  
Vol 904 ◽  
pp. 63-66
Author(s):  
Hui Xia Wang ◽  
Li Xia Jia ◽  
Jun Mei Liu ◽  
Yin Yin Liu
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Polyurethane Foam ◽  
Sandwich Composite ◽  
Sandwich Composites ◽  
Shear Property ◽  
Spacer Fabric

Three different panel density of sandwich composites were designed. The composite was reinforced by spacer fabric woven with polyester filaments, fiiled by polyurethane foam in the space of the fabric and composite the epoxy resin on the surface of the fabric. The effects of different panel density on the mechanical properties of sandwich composite were tested,including the shear property and peel property. The results showed that the panel density have some effects on the mechanical properties. Shear and peel property increased with the panel density increased.

Bending and impacting of sandwich composites with a corrugated paper core layer

2018 ◽  
Vol 32 (19) ◽  
pp. 1840057 ◽  
Author(s):  
Jieng-Chiang Chen
Keyword(s):  
Core Layer ◽  
Test System ◽  
Absorption Capacity ◽  
Sandwich Composite ◽  
Sandwich Composites ◽  
Hot Press ◽  
Jute Fabric ◽  
The Core ◽  
The Impact ◽  
Corrugated Paper

The bending and impacting characteristics of sandwich composites containing corrugated paper (CP) as a core layer are discussed herein. The core layer of the sandwich composite was fabricated with CP-reinforced polylactic acid (PLA) resin. The core layer was then stacked with jute fabric and PLA films on the top and bottom surfaces to fabricate the sandwich composites. Two composites [CP-reinforced PLA composite (CP/PLA composite)] and jute fabric/PLA sandwich composite with CP as a core layer [J/PLA/CP composite] were developed in this study. To manufacture the CP/PLA composite core layer, a dipping bath was used for impregnating the paper with a molten PLA solution. The resin film method combined with a hot press was used to produce the jute fabric/PLA/CP sandwich composites. A material test system (MTS810) was used to study the bending properties of the composites. Further, an IZOD impacting instrument was used to examine the impacting characteristics of the composites. Both the CP/PLA and jute fabric/PLA/CP sandwich composites increase the energy absorption capacity in the impact test.

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.

Tensile and compressive performances of foam core sandwich composites with various core modifications

2016 ◽  
Vol 19 (1) ◽  
pp. 49-65 ◽  
Author(s):  
Huseyin E Yalkin ◽  
Bulent M Icten ◽  
Tuba Alpyildiz
Keyword(s):  
Sandwich Composite ◽  
Foam Core ◽  
Sandwich Composites ◽  
Time Consumption ◽  
The Core ◽  
Out Of Plane

The objective of this study is to enhance the out-of-plane tensile and compressive performances of foam core sandwich composite via structural core modifications considering the ease of application and time consumption. The performances of single core perforated, single core stitched, divided core perforated, and divided core stitched sandwich composites are compared with each other and reference plain foam core sandwich composites. Results indicate that “perforated and stitched core” sandwich composites have superior strength, and in terms of performance modification, dividing the core is found very efficient for plain (non-perforated and non-stitched) core sandwich composites.

scholarly journals Effect of Selected Injection Conditions on the Mechanical Properties and Structure of HDPE

2018 ◽  
Vol 26 (5(131)) ◽  
pp. 93-98
Author(s):  
Katarzyna Mordal ◽  
Karol Dobrakowski ◽  
Dariusz Kwiatkowski
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Polymeric Materials ◽  
Injection Velocity ◽  
Scanning Calorimetry ◽  
Melt Flow Rate ◽  
Variable Parameters ◽  
Injection Process ◽  
Hardness Tests ◽  
Research Plan

This paper is devoted to research of high-density polyethylene (HDPE), which belongs to one of three main biomaterial groups, i.e. polymeric materials. Hence, due to its unique properties, it still plays an important role in biomedical applications – especially in the production of medical equipment, implants and parts of prostheses. This publication deals with the effect of selected conditions of processing which involved injection moulding on the mechanical properties and structure of HDPE mouldings. Samples for tests were produced on a Krauss  Maffei injection moulder on the basis of a research plan prepared using the STATISTICA program. According to this schedule, the following variable parameters of the injection process were selected: injection temperature Tw [C], mould temperature Tf [C] and injection velocity vw [mm/s]. In addition, a part of the moldings was subjected to a few processings. Then the samples obtained were subjected to different tests: tensile, impact and hardness tests, Differential Scanning Calorimetry (DSC) and the melt flow rate (MFR) test in order to determine the influence of selected injection conditions and the multiplicity of processing on the mechanical, rheological and structural properties of HDPE.

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