Studies of Mechanical Properties of Multiwall Nanotube Based Polymer Composites

2014 ◽  
Vol 5 (3) ◽  
Author(s):  
A. K. Gupta ◽  
S. P. Harsha
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Composite Structures ◽  
Secondary Reinforcement ◽  
Chemical Vapor ◽  
Carbon Composite ◽  
Diglycidyl Ether ◽  
Two Phase ◽  
Three Phase ◽  
Structural Applications

The two phase polymer composites have been extensively used in various structural applications; however, there is need to further enhance the strength and stiffness of these polymer composites. Carbon nanotubes (CNTs) can be effectively used as secondary reinforcement material in polymer based composites due to their superlative mechanical properties. In this paper, effects of multiwall nanotubes (MWNTs) reinforcement on epoxy–carbon polymer composites are investigated using experiments. MWNTs synthesized by chemical vapor deposition (CVD) technique and amino-functionalization are achieved through acid-thionyl chloride route. Diglycidyl ether of bisphenol-A (DGEBA) epoxy resin with diethyl toluene diamine (DETDA) hardener has been used as matrix. T-300 carbon fabric is used as the primary reinforcement. Three types of test specimen of epoxy–carbon composite are prepared with MWNT reinforcement as 0%, 1%, and 2% MWNT (by weight). The resultant three phase nanocomposites are subjected to tensile test. It has been found that both tensile strength and strain at failure are substantially enhanced with the small addition of MWNT. The analytical results obtained from rule of mixture theory (ROM) shows good agreement with the experimental results. The proposed three phase polymer nanocomposites can find applications in composite structures, ballistic missiles, unmanned arial vehicles, helicopters, and aircrafts.

Effect of Mechanical Properties on Various Surface Treatment Processes of Banana/Cotton Woven Fabric Vinyl Ester Composite

2017 ◽  
Vol 867 ◽  
pp. 41-47 ◽  
Author(s):  
Chitra Umachitra ◽  
N.K. Palaniswamy ◽  
O.L. Shanmugasundaram ◽  
P.S. Sampath
Keyword(s):  
Mechanical Properties ◽  
Composite Structures ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Surface Treatments ◽  
Fiber Reinforced Polymer ◽  
Woven Fabric ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Structural Applications

Natural fibers have been used to reinforce materials in many composite structures. Many types of natural fibers have been investigated including flax, hemp, ramie, sisal, abaca, banana etc., due to the advantage that they are light weight, renewable resources and have marketing appeal. These agricultural wastes can also be used to prepare fiber reinforced polymer hybrid composites in various combinations for commercial use. Application of composite materials in structural applications has presented the need for the engineering analysis. The present work focuses on the fabrication of polymer matrix composites by using natural fibers like banana and cotton which are abundant in nature and analysing the effect of mechanical properties of the composites on different surface treatments on the fabric. The effect of various surface treatments (NaOH, SLS, KMnO4) on the mechanical properties namely tensile, flexural and impact was analyzed and are discussed in this project. Analysing the material characteristics of the compression moulded composites; their results were measured on sections of the material to make use of the natural fiber reinforced polymer composite material for automotive seat shell manufacturing.

scholarly journals Experimental Investigation on Mechanical Properties of A/GFRP, B/GFRP and AB/GFRP Polymer Composites

2022 ◽  
Vol 58 (4) ◽  
pp. 28-36
Author(s):  
Velmurugan Natarajan ◽  
Ravi Samraj ◽  
Jayabalakrishnan Duraivelu ◽  
Prabhu Paulraj
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Glass Fiber ◽  
Polymer Composites ◽  
Fiber Reinforced ◽  
Gfrp Composites ◽  
Glass Fiber Reinforced ◽  
Structural Applications ◽  
Polyester Composites

This study aims to reveal the consequence of thickness reinforcement on Fiber Laminates (Polyester Resin, Glass Fiber, Aluminum, and Bentonite) and to see if it can enhance the mechanical properties and resistance of laminates. Glass fiber reinforced polymer composites have recently been used in automotive, aerospace, and structural applications where they will be safe for the application s unique shape. Hand layup was used to fabricate three different combinations, including Aluminium /Glass fiber reinforced polyester composites (A/GFRP), Bentonite/Glass fiber reinforced polyester composites (B/GFRP), and Aluminium&Bentonie/Glass fiber reinforced polyester composites (AB/GFRP). Results revealed that AB/GFRP had better tensile strength, flexural strength, and hardness than GFRP and A/GFRP. Under normal atmospheric conditions and after exposure to boiling water, hybrid Aluminium&Bentonite and glass fiber-reinforced nanocomposites have improved mechanical properties than other hybrid composites. After exposure to temperature, the flexural strength, tensile strength and stiffness of AB/GFRP Composites are 40 % higher than A/GFRP and 17.44% higher than B/GFRP Composites.

Plasma-Assisted Functionalization of the Carbon Black Surface: Enhancement of Mechanical Properties of Carbon Black/Poly(vinylidene fluoride-co-hexafluoropropene) Nanofibers

2020 ◽  
Vol 20 (9) ◽  
pp. 5648-5653
Author(s):  
Jingjing Zhang ◽  
Yeong Min Park ◽  
Xing Yan Tan ◽  
Mun Ki Bae ◽  
Seung Pyo Hong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Polymer Composites ◽  
Vinylidene Fluoride ◽  
Thermal Conductance ◽  
Strain Curve ◽  
Chemical Vapor ◽  
Nitrogen Plasma ◽  
Poly Vinylidene Fluoride ◽  
Black Surface

Dispersion of carbon black (CB) powder in CB/polymer composites considerably influences their mechanical properties, electrical conductivity, and thermal conductance. In this study, with the aim to improve the dispersion of CB powder in the CB/polymer composites, CB was treated with oxygen and nitrogen plasma generated by radio frequency-plasma enhanced chemical vapor deposition (RF-PECVD), and then, dispersed in a poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) solution. The solution was then subjected to electrospinning, leading to the formation of a nanofiber mat. The dispersion states of plasma treated CBs have been characterized using scanning electron microscopy and Fourier-transform infrared spectroscopy. A stress–strain curve was used to investigate the influence of dispersion on the mechanical properties of CB/polymer composites.

Microstructures and Mechanical Properties of NiAl+Mo In-Situ Eutectic Composites

1990 ◽  
Vol 194 ◽  
Author(s):  
P. R. Subramanian ◽  
M. G. Mendiratta ◽  
D. B. Miracle ◽  
D. M. Dimiduk
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Room Temperature ◽  
Composite System ◽  
Elevated Temperatures ◽  
Two Phase ◽  
Structural Applications ◽  
Temperature Fracture

AbstractThe quasibinary NiAI-Mo system exhibits a large two-phase field between NiAl and the terminal (Mo) solid solution, and offers the potential for producing in-situ eutectic composites for high-temperature structural applications. The phase stability of this composite system was experimentally evaluated, following long-term exposures at elevated temperatures. Bend strengths as a function of temperature and room-temperature fracture toughness data are presented for selected NiA1-Mo alloys, together with results from fractography observations.

scholarly journals Radiation and thermal effects upon mechanics of polymer composites

2020 ◽  
Vol 4 (394) ◽  
pp. 89-98
Author(s):  
Sergei I. Emelyanov ◽  
Nikolay L. Kuchin ◽  
Boris A. Yartsev ◽  
Vladimir L. Lebedev
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Radiation Effects ◽  
Nuclear Reactions ◽  
Extreme Temperature ◽  
Physical And Mechanical Properties ◽  
Computational Prediction ◽  
Effect Of Temperature ◽  
Dynamic Methods ◽  
Structural Applications

Object and purpose of research. This paper discusses polymeric composites of various structural applications that may be exposed to extreme temperature and/or radiation, with possible implications for their physical and mechanical properties. Materials and methods. We used static and dynamic methods for determining the constants characterizing the mechanical properties of polymer composites. The analysis of numerous nuclear reactions occurring during neutron irradiation of a polymer composite with a certain chemical composition was carried out by the method of computational prediction. The results of this analysis confirm the change in the composition of the composite and the possibility of changing its internal structure. Main results. Suitability of the investigated composites for the applications accompanied by high-temperature and radiation effects, like foundations of marine nuclear reactors, has been confirmed. Conclusion. For the considered range of temperature and radiation effects, the effect of temperature on structural performance of a composite determined, in its turn, by the mechanical properties of its matrix, is the most significant, while radiation exposure turned out to be less important. Developing polymer composites for more intense radiation environments, like neutron fluxes or gamma rays, it is advisable to optimize their chemistry so as to reduce or totally eliminate the elements capable of generating long-lived radionuclides.

Effect of Silane Treatments on Mechanical Performance of Kenaf Fibre Reinforced Polymer Composites: A Review

2021 ◽  
Author(s):  
Mohd Nurazzi Norizan ◽  
Aisyah Humaira Alias ◽  
F.A. Sabaruddin ◽  
M.R.M. Asyraf ◽  
S.S. Shazleen ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Composite Structures ◽  
Mechanical Performance ◽  
Alkaline Treatment ◽  
Global Environmental Problems ◽  
Kenaf Fibre ◽  
Structural Applications ◽  
Naoh Solution ◽  
Fibre Reinforced Polymer ◽  
Cellulosic Fibres

Abstract Natural cellulosic fibres, such as kenaf, can be used in polymeric composites in place of synthetic fibres. The rapid depletion of synthetic resources such as petroleum and growing awareness of global environmental problems associated with synthetic products contribute to the acceptance of natural fibres as reinforcing material in polymer composite structures. In Africa and Asia, kenaf is considered a major crop used for various cordage products such as rope, twine, and burlap and in construction, it is used for thermal insulation of walls, floors, and roofs and soundproofing solutions. In the furniture and automotive industry, it is used to manufacture medium-density fibreboard (MDF) and other composite materials for structural applications. Kenaf is primarily composed of cellulose (approximately 40 to 80%), which accounts for its superior mechanical performance. Kenaf fibres are chemically treated before mixing with the polymer matrix to improve their fibre interaction and composite performance. The alkaline treatment with sodium hydroxide (NaOH) solution is the most frequently used chemical treatment, followed by a silane treatment. Numerous chemical concentrations of NaOH and silane solutions are investigated and several combined treatments such as alkaline-silane. The present review discusses the effect of silane treatments on the surface of kenaf fibre on the fabrication of polymer composites and their mechanical properties.

scholarly journals Three-Phase Carbon Fiber Amine Functionalized Carbon Nanotubes Epoxy Composite: Processing, Characterisation, and Multiscale Modeling

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Kamal Sharma ◽  
Mukul Shukla
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Epoxy Matrix ◽  
Flexural Modulus ◽  
Pronounced Increase ◽  
Three Phase ◽  
Structural Applications ◽  
Key Issues ◽  
Experimental Values ◽  
Multiscale Composites

The present paper discusses the key issues of carbon nanotube (CNT) dispersion and effect of functionalisation on the mechanical properties of multiscale carbon epoxy composites. In this study, CNTs were added in epoxy matrix and further reinforced with carbon fibres. Predetermined amounts of optimally amine functionalised CNTs were dispersed in epoxy matrix, and unidirectional carbon fiber laminates were produced. The effect of the presence of CNTs (1.0 wt%) in the resin was reflected by pronounced increase in Young’s modulus, inter-laminar shear strength, and flexural modulus by 51.46%, 39.62%, and 38.04%, respectively. However, 1.5 wt% CNT loading in epoxy resin decreased the overall properties of the three-phase composites. A combination of Halpin-Tsai equations and micromechanics modeling approach was also used to evaluate the mechanical properties of multiscale composites and the differences between the predicted and experimental values are reported. These multiscale composites are likely to be used for potential missile and aerospace structural applications.

Flexural Performance of Geopolymer Concrete Modified with Pozzalonic Minerals and Secondary Reinforcement

2018 ◽  
Vol 15 (2) ◽  
pp. 459-469
Author(s):  
D. R. Anand Rejilin ◽  
R. Murugesan ◽  
V. Bravin Ebanesh
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Secondary Reinforcement ◽  
Fibre Reinforcement ◽  
Percentage Increase ◽  
Cement Concrete ◽  
Flexural Performance ◽  
Micro Cracks ◽  
Structural Applications

Concrete, the versatile building material is relevantly used for structural applications for its ease of application and in situ adaptability. Decline of raw materials, cost and environmental issues related to unsustainable usage of cement, persuades the construction industries for an alternate binder similar to cement. Geoploymer concrete known for its eco-friendly manufacturing process and economic approach makes the, GPC a viable substitute for cement concrete. At elevated temperature, GPC undergoes polymerisation reaction and develops three dimensional amorphous components which exhibits enriched mechanical properties. To achieve the in-situ application of geoploymer concrete and to overcome the requirement of heat during polymerisation reaction, fly ash based GPC was modified with different proportions of GGBS and OPC and curing it with ambient temperature for enhancing its mechanical behaviour. Variation in temperature during the initial stages of casting process produces micro cracks which are prevented by addition of Secondary reinforcements which furthermore improved the mechanical properties. A constant percentage of GUJCON fiber as secondary reinforcement was added to all the modified proportions. The fly ash based GPC replaced with GGBS and OPC showed improved split and compressive strength at 100% and 40%. Further improvement of strength was observed with 12% replacement of GGBS with OPC to GGBS based GPC. The flexural performance of the modified GPC with optimum proportions of GGBS and OPC was compared with conventional cement concrete beam. The percentage increase in strength of GGBS based GPC with optimum OPC content when compared with conventional specimens showed 53% improvement in strength. When fibre reinforcement was added in prescribed quantity, it promoted the mechanical strength and reduced micro cracks by which the load carrying capacity was increased to 66%. The structural performance of modified GPC was found to be suitable for in situ applications in ambient curing condition.

Experimental Analysis and Study of the Shock Absorption of Carbon Composite

2016 ◽  
Vol 827 ◽  
pp. 157-160
Author(s):  
Michal Petrů ◽  
Ladislav Ševčík ◽  
Aleš Lufinka ◽  
Martina Syrovátková
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Experimental Analysis ◽  
Mechanical Engineering ◽  
Carbon Composite ◽  
Regular Part ◽  
Real Output ◽  
Shock Absorption ◽  
Lower Weight ◽  
Structural Applications

Composite materials are a regular part of many industries - aerospace, automotive, mechanical engineering. Lower weight and comparable in some ways even better mechanical properties, are the reason why composites progressively substitute traditional metal based material. The article describes the design of composite tub with metal reinforcement. Compares the theoretical and real output of sample produced from CF prepreg specially designed for absorbing the energy during crash impact. The results show that the sample due to its deformation is able to absorb some energy and become a material usable in structural applications.

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