scholarly journals Physico-mechanical and morphological studies of jute/glass reinforced epoxy composites and its hybrids

2021 ◽  
Author(s):  
Partha Pratim Das ◽  
◽  
Rohit Sahu ◽  
Vijay Chaudhary ◽  
Krovvidi Srinivas ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Hybrid Composites ◽  
Research Work ◽  
Experimental Studies ◽  
Mechanical Tests ◽  
Epoxy Composites ◽  
Morphological Studies ◽  
Glass Fibre Reinforced ◽  
Closed Mold ◽  
Composite Samples

Present research work emphasis on the fabrication and evaluation of the physico-mechanical performance of jute/glass fibre reinforced epoxy composites and their hybrids. Composite samples were fabricated by closed mold hand lay-up technique. Fibre/matrix interfacial adhesion of fractured specimens after mechanical tests was investigated using SEM (scanning electron microscope). Among J/Epoxy, G/Epoxy, J/G/Epoxy, J/G/Epoxy composites show the maximum Shore-D hardness value of 99 as compared to jute/epoxy and glass/epoxy of Shore-D hardness value of 96 and Hardness value of 98 Shore-D, respectively. Experimental studies have shown that there are superior Physico-mechanical properties of hybrid composites (jute/glass/epoxy).

Development of Banana/Coir Natural Fibers Reinforced Polypropylene Hybrid Composites: The Effect of MA-g-PP (Maleic Anhydride Grafted Polypropylene) on Mechanical Properties and Thermal Properties

2021 ◽  
Vol 32 ◽  
pp. 85-97
Author(s):  
Gunturu Bujjibabu ◽  
Vemulapalli Chittaranjan Das ◽  
Malkapuram Ramakrishna ◽  
Konduru Nagarjuna
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Coupling Agent ◽  
Mechanical Performance ◽  
Hybrid Composites ◽  
Natural Fibers ◽  
Mechanical Tests ◽  
Coir Fiber ◽  
Banana Fiber ◽  
C Fibers

Banana/Coir fiber reinforced polypropylene hybrid composites was formulated by using twin screw extruder and injection molding machine. Specimens were prepared untreated and treated B/C Hybrid composites with 4% and 8% of MA-g-PP to increase its compatibility with the polypropylene matrix. Both the without MA-g-PP and with MA-g-PP B/C hybrid composites was utilized and three levels of B/C fiber loadings 15/5, 10/10 and 5/15 % were used during manufacturing of B/C reinforced polypropylene hybrid composites. In this work mechanical performance (tensile, flexural and impact strengths) of untreated and treated (coupling agent) with 4% and 8% of MA-g-PP B/C fibers reinforced polypropylene hybrid composite have been investigated. Treated with MA-g-PP B/C fibers reinforced specimens explored better mechanical properties compared to untreated B/C fibers reinforced polypropylene hybrid composites. Mechanical tests represents that tensile, flexural and impact strength increases with increase in concentration of coupling agent compared to without coupling agent MA-g-PP hybrid composites . B/C fibers reinforced polymer composites exhibited higher tensile, flexural and impact strength at 5% of Banana fiber, 15% of fiber Coir in the presence of 8% of MA-g-PP compared to 4% of MA-g-PP and untreated hybrid composites. The percentage of water absorption in the B/C fibers reinforced polypropylene hybrid composites resisted due to the presence of coupling agent MA-g-PP and thermogravimetry analysis (TGA) also has done.

Mechanical, chemical and sound absorption properties of glass/kenaf/waste tea leaf fiber-reinforced hybrid epoxy composites

2020 ◽  
pp. 152808372095739 ◽  
Author(s):  
L Prabhu ◽  
V Krishnaraj ◽  
S Gokulkumar ◽  
S Sathish ◽  
MR Sanjay ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Hybrid Composites ◽  
Experimental Studies ◽  
Epoxy Composites ◽  
Fiber Reinforced ◽  
Waste Tea ◽  
Kenaf Fibers ◽  
Tea Leaf ◽  
Absorption Characteristics ◽  
Leaf Fiber

This work aims to investigate the mechanical and sound absorption characteristics of industrial waste tea leaf fiber (WTLF), kenaf and E-glass fiber–reinforced hybrid epoxy composites through experimental studies. The WTLF and kenaf fibers were initially treated with 5% sodium hydroxide. Hybrid composites were fabricated by compression molding technique with a composition of 40 wt.% fiber and 60 wt.% matrix. The fabricated hybrid composites were subjected to mechanical and sound absorption studies as per ASTM standards. Results revealed better mechanical properties in the composites with 25 wt.% kenaf and 5 wt.% WTLF, whereas sound absorption characteristics were better for composites containing 25 wt.% WTLF and 5 wt.% kenaf fiber. The surface morphology of the fractured specimens such as fiber pullout and matrix crack was examined using scanning electron microscopy. Spectrum investigation of alkali-treated hybrid composites showed excellent interfacial bonding between the polymer and fiber compared to the untreated fiber.

Adhesives for increasing the bonding strength of in situ manufactured metal-composite joints

2020 ◽  
pp. 095440702096575
Author(s):  
Robert Thomas ◽  
Fabian Fischer ◽  
Maik Gude
Keyword(s):  
Bonding Strength ◽  
Elevated Temperatures ◽  
Mechanical Performance ◽  
Storage Conditions ◽  
Mechanical Tests ◽  
Metal Composite ◽  
Scanning Calorimetry ◽  
Lap Shear ◽  
Glass Fibre Reinforced ◽  
Metallic Parts

In this present work, the potential of metallic parts, locally reinforced with a continuous glass fibre reinforced thermoset material, pre-impregnated with an epoxy matrix (prepreg), was evaluated by differential scanning calorimetry (DSC), single-lap shear tests and 3-point bending tests of a metal-composite hybrid hat profile. This technology is evaluated regarding an automotive use case, the DSC experiments in combination with moulding trials have proven curing times below 30 s for a moulding temperature of 180°C. A bonding strength of 13.5 MPa was characterized for a co-cured fibre-reinforced plastic (frp) onto a metallic joining partner. By additionally introducing an epoxy glue film as a bonding agent, which is co-cured together with the frp, the bonding strength can be increased significantly up to 25.4 MPa at the expense of the curing time. The mechanical tests on the hybrid hat profile have shown an increase of energy absorption compared with non-reinforced hat profiles. Here, also an additional glue film extends the performance regarding a co-cured plastic reinforcement without glue film. The influence of the storage conditions of the uncured prepreg materials on the mechanical performance was evaluated by a simulated physical ageing at elevated temperatures, followed by a mechanical characterization of the bonding strength and part performance. Also the effect of different testing temperatures and testing velocities on the capability of the metal-composite hybrid part is illustrated.

Research Progress on Mechanical Properties of Short Carbon Fibre/Epoxy Composites

2019 ◽  
Vol 12 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Guanghui Zhao ◽  
Jijia Zhong ◽  
Y.X. Zhang
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Mechanical Performance ◽  
Experimental Studies ◽  
Weight Ratio ◽  
Epoxy Composites ◽  
Experimental Techniques ◽  
Research Progress ◽  
Future Research ◽  
Short Carbon

Background: Short carbon fibre reinforced epoxy composites have many advantages such as high strength-to-weight ratio, corrosion resistance, low cost, short fabrication time and easy manufacturing. Researches on the mechanical performance of the composites are mainly carried out by means of experimental techniques and numerical calculation. Objective: The study aims to report the latest progress in the studies of mechanical properties of short carbon fibre reinforced epoxy composites. Methods: Based on recently published patents and journal papers, the experimental studies of short carbon fibre reinforced epoxy composites are reviewed and the effects of short carbon fibre on the mechanical properties of the composites are discussed. Numerical studies using representative volume element in simulating macroscopic mechanical properties of the short fibre reinforced composites are also reviewed. Finally, future research of short carbon fibre reinforced epoxy composites is proposed. Results: Experimental techniques, experimental results and numerical simulating methods are discussed. Conclusion: Mechanical properties of epoxy can be improved by adding short carbon fibres. Fiber surface treatment and matrix modification are effective in enhancing interfacial adhesion between fiber and matrix, and as a result, better mechanical performance is achieved. Compared to the studies on equivalent mechanical properties of the composites, researches on the micro-mechanism of interaction between fiber and matrix are still in infancy due to the complexity of both the internal structure and reinforcing mechanism.

scholarly journals Design new epoxy nanocomposite coatings based on metal vanadium oxy-phosphate M0.5VOPO4 for anti-corrosion applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. A. Deyab ◽  
Brahim El Bali ◽  
Q. Mohsen ◽  
Rachid Essehli
Keyword(s):  
Electrochemical Impedance ◽  
Research Work ◽  
Mechanical Tests ◽  
Epoxy Composites ◽  
Nanocomposite Coatings ◽  
Storage Tanks ◽  
Corrosion Properties ◽  
Epoxy Nanocomposite ◽  
Petroleum Storage ◽  
Very High

AbstractEpoxy nanocomposite coatings are an essential way to protect petroleum storage tanks from corrosion. For this purpose, the new nanocomposite epoxy coatings (P-M/epoxy composites) have been successfully designed. The P-M/epoxy composites are based on the metal vanadium oxy-phosphate M0.5VOPO4 (where M = Mg, Ni, and Zn). The function of P-M/epoxy composites as anti-corrosion coatings was explored using electrochemical and mechanical tests. Using electrochemical impedance spectroscopy (EIS), it has been noticed that the pore resistance and polarization resistance of the P-M/epoxy composites remain higher as compared to the neat epoxy. The P-M/epoxy composites have the greatest impact on the cathodic dis-bonded area and water absorption. Besides, P-M/epoxy composites exhibit a very high order of mechanical properties. Further, Mg0.5VOPO4 has the greatest effect on the anti-corrosion properties of epoxy coating followed by Zn0.5VOPO4 and Ni0.5VOPO4. All these properties lead to developing effective anti-corrosion coatings. Thus, the net result from this research work is highly promising and provides a potential for future works on the anti-corrosion coating.

Mechanical and thermal properties of PVC and polyurethane foam hybrid composites

2020 ◽  
Vol 62 (5) ◽  
pp. 544-552
Author(s):  
B. Vijaya Ramnath ◽  
A. Kesavan ◽  
E. Chinnadurai
Keyword(s):  
Hybrid Composites ◽  
Thermo Gravimetric Analysis ◽  
Research Work ◽  
Mechanical Tests ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis ◽  
Sandwich Composites ◽  
Double Shear ◽  
Hardness Tests ◽  
Structural Applications

Abstract Sandwich foam composites are mostly used today in structural applications in aerospace and automobile industries due to light weight and high stiffness of the sandwich composites. In this research work, the composites were fabricated by using polyurethane and PVC foam and carbon fiber as skin. Sandwich composites were fabricated by the hand lay-up method. Mechanical tests such as tensile, flexural, impact, double shear, inter delamination and hardness tests were conducted. A thermo gravimetric analysis (TGA) test was also performed for the analysis of the temperature characteristics of the sandwich composites. The internal structures of tested samples were analyzed through a scanning electron microscope (SEM). The results show that the tensile, flexural, impact, thermal and inter delamination strengths of PVC foam composites are superior to those of other composites.

Contributions in the Study of Hybrid Layered Composites under Static and Variable Loads

2008 ◽  
Vol 385-387 ◽  
pp. 485-488
Author(s):  
Nicolae Constantin ◽  
Viorel Anghel ◽  
Mircea Găvan ◽  
Ştefan Sorohan
Keyword(s):  
Failure Modes ◽  
Mechanical Performance ◽  
Hybrid Composites ◽  
Research Work ◽  
Low Velocity Impact ◽  
Static Fatigue ◽  
Pure Aluminium ◽  
Low Velocity ◽  
Velocity Impact ◽  
Impact Tests

The research work behind this paper focused a rather extensive assessment of hybrid composites made of pure aluminium sheets, alternating with GFRP and CFRP layers. Static, fatigue and low velocity impact tests were performed, combined with NDI on damaged samples, using Lockin thermography, on specimens obtained from the two hybrid laminates and from genuine GFRP and CFRP laminates, all having five layers. The static and fatigue tests were made on parallel specimens, un-notched and having a central 5 mm drilled hole, with various failure modes. The low velocity impact tests were followed by CAI tests, meant to evaluate residual mechanical performance and damage tolerance. Lockin thermography was used for prior assessment of damage.

Effect of interlayer hybridization of carbon, Kevlar, and glass fibers with oxidized polyacrylonitrile fibers on the mechanical behaviors of hybrid composites

2019 ◽  
Vol 234 (9) ◽  
pp. 1823-1835 ◽  
Author(s):  
Hossein Ebrahimnezhad-Khaljiri ◽  
Reza Eslami-Farsani ◽  
Ebrahim Akbarzadeh
Keyword(s):  
Energy Absorption ◽  
Carbon Fibers ◽  
High Performance ◽  
Hybrid Composites ◽  
Glass Fibers ◽  
Mechanical Tests ◽  
Epoxy Composites ◽  
Polyacrylonitrile Fiber ◽  
Flexural Test ◽  
Mechanical Behaviors

This study focuses on tensile and flexural behaviors of epoxy composites, which have been reinforced by oxidized polyacrylonitrile fibers and high-performance fibers (carbon, glass, and Kevlar). In hybrid composites, the parameters of hybridization show positive or negative hybrid effects on its mechanical properties. The results of energy absorption achieved from the tensile test depicted that reinforced hybrid composites by two plies of oxidized polyacrylonitrile fiber and two plies of carbon, Kevlar, and glass fibers with energy absorption of 916, 700, and 899 kJ m–3 had the maximum hybridization parameter, which were 1.1, 0.64, and 1.54, respectively. Also, the mentioned hybrid composites with flexural stresses of 279.4, 198.5, and 167.3 MPa had the maximum hybridization parameter in a flexural test, which were 3.01, 2.68, and 1.80, respectively. Hybrid composites, which were reinforced by three plies of oxidized polyacrylonitrile fiber/one ply carbon fibers, three plies of oxidized polyacrylonitrile fiber/one ply of glass fibers, and two plies of oxidized polyacrylonitrile fiber/two plies of Kevlar fibers, had the maximum pseudo strain in their group, which were 0.12%, 0.65%, and 0.17%, respectively. The microstructure investigations depicted crossing cracks among oxidized polyacrylonitrile fiber and cutting the oxidized polyacrylonitrile fiber, which were caused to increase the hybridization parameters in mechanical tests. Also, it was found that as compared with carbon, glass, and Kevlar fibers, oxidized polyacrylonitrile fiber had a ductile fracture, which was the reason for the pseudo-ductility behavior in hybrid composites.

Polypropylene hybrid composites: Effect of reinforcement of sisal and carbon fibre on mechanical, thermal and morphological properties

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jyoti Agarwal ◽  
Smita Mohanty ◽  
Sanjay K Nayak
Keyword(s):  
Carbon Fibre ◽  
Mechanical Performance ◽  
Hybrid Composites ◽  
Mechanical Tests ◽  
Critical Stress Intensity Factor ◽  
Morphological Properties ◽  
Morphological Observation ◽  
Sisal Fibre ◽  
Variable Weight ◽  
The Impact

Abstract Polypropylene (PP)/sisal fibre (SF)/carbon fibre (CF) hybrid composites were prepared by melt blending process at a variable weight percentage (wt%) of carbon: sisal fibre loading (20:10, 15:15, 10:20, and 5:25). MA-g-PP (MgP) as a compatibiliser was used to improve the dispersion of the fibres within the PP matrix. The composites were subjected to mechanical tests to optimize the fibre content of CF: SF. Incorporation of 20 wt% of CF and 10 wt% of SF with 5 wt% MgP resulted in higher mechanical performance of about 67.02 and 112% over that of PP/SF composite. Similarly, the impact strength was found to be optimum which enhanced to the tune of 39.62% as compared with PP/SF composites. Halpin Tsai model was used to compare the theoretical tensile modulus of PP/SF/MgP composites and PP/SF/CF/MgP hybrid composites with experimental evaluated values. Fracture toughness parameters such as K IC (critical stress intensity factor) and G IC (critical strain energy release rate) are determined for PP/SF/MgP composites and PP/SF/CF/MgP hybrid composites and compared by using single edge notch test. DSC study showed higher melting temperature (T m ) of PP/SF/CF/MgP composites as compared to PP revealing the enhancement in thermal stability. TGA/DTG study revealed the synergistic effect of the hybrid composite thus confirming the hybridisation effect of the system. DMA study showed that the hybridisation of CF and SF within the matrix polymer contributes to an increase in the storage modulus (Eʹ). Morphological observation by SEM confirmed that the carbon fibres and sisal fibres are well uniformly dispersed within the PP matrix, in the presence of MgP.

Properties of Carbon Nanotubes-Calcium Carbonate Hybrid Filled Epoxy Composites

2020 ◽  
Vol 1010 ◽  
pp. 136-141
Author(s):  
Siti Shuhadah Md Saleh ◽  
Siti Maisarah Suhaimi ◽  
Hazizan Md Akil ◽  
Nur Farahiyah Mohammad
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Calcium Carbonate ◽  
Polymer Composites ◽  
Hybrid Composites ◽  
Tensile Modulus ◽  
Chemical Vapor ◽  
Filler Loading ◽  
Epoxy Composites ◽  
Morphological Studies

Carbon nanotubes (CNTs) have a great potential to be used as filler to enhance the mechanical properties of polymer composites due to excellent properties. However, CNTs have limitation of difficult to disperse in polymer matrix. The hybridization of CNTs and inorganic fillers can improve the dispersion and combine their properties in polymer composites. In the present work, the properties of the epoxy composites filled with carbon nanotube-calcium carbonate (CNTs-CaCO3) hybrid, at various filler loading (i.e., 1-5 wt.%) were studied. The CNTs-CaCO3 hybrid fillers were prepared by physically mixing (PHY) method and chemical vapor deposition (CVD) method. The tensile properties and hardness of both composites were investigated at different weight percentages of filler loading. The CNTs-CaCO3 CVD hybrid composites showed higher tensile strength and hardness than the CNTs-CaCO3 PHY hybrid composites. This increase was associated with the homogenous dispersion of CNT–CaCO3 particle filler. The morphological studies of fracture surfaces after tensile test by means of SEM showed homogenous dispersion of CNTs-calcium carbonate CVD hybrid in epoxy matrix. The result shows that the CNTs-calcium carbonate CVD hybrid composites are capable in increasing tensile strength by up to 116.4%, giving a tensile modulus of 40.3%, and hardness value of 39.2% as compared to a pure epoxy.

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