FRICTION BRAKING PERFORMANCE OF NANOFILLED HYBRID FIBER REINFORCED PHENOLIC COMPOSITES: INFLUENCE OF NANOCLAY AND CARBON NANOTUBES

TEJ SINGH,AMAR PATNAIK,BHABANI K. SATAPATHY 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.3

Graphite lubricated phenolic-based friction composites filled with nanoclay and Multiwalled carbon nanotubes (MWCNT) and reinforced with lapinus and Kevlar fibers have been successfully fabricated for evaluation of their physical, chemical, mechanical and tribological properties, respectively. The increase in nanoclay and MWCNT contents led to the increase in bulk physical properties such as void contents, ash contents, water absorption and compressibility. The impact, tensile and flexural strengths get affected deleteriously when complemented by lapinus and kevlar fibers in the composites. However, with the increase in nanoclay and MWCNT contents the μ-performance, friction fade resistance and friction recovery enhanced whereas, friction fluctuations, stability and variability coefficients have been observed to be dependent on the composition. The addition of nanoclay and MWCNT raises the disc temperature whereas wear resistance of the friction composites increases with the decreasing in nanoclay and MWCNT contents. Comprehensively, it is found that with the higher nanoclay: MWCNT ratio (i. e., 1.375:1.375 wt.%) overall frictional response (μp = 0.386) is enhanced, showed lowest fading (fade = 22.80%) and excellent recovery performance (recovery = 130.37%). Finally, the wear surface morphology studies have been done by using scanning electron microscope (SEM) to analyze the wear mechanisms qualitatively by understanding nature of the friction contact patches.

Waste Fly Ash Powder Filled Glass Fiber Reinforced Epoxy Composite: Physical, Mechancial, Thermo-mechanical, and Threebody Abrasive Wear Analysis

Vikas Sharma,Makkhan Lal Meena,Mukesh Kumar,Amar Patnaik 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4

In the present research work, waste fly ash powder-filled chopped glass fiber reinforced epoxy composites arefabricated. Conventional open mold casting technique is used for fabrication of composite samples. The fly ash powder isincorporated from 0 to 15 wt.% in the composite at an interval of 5 wt.% to analyze the physical (experimental and theoreticaldensities, void fraction and hardness), mechanical (tensile strength, tensile modulus, flexural strength, flexural modulus,impact strength), thermo-mechanical (dynamic mechanical analysis, DMA), and three-body abrasive wear rate, respectively. From this study, it is clearly seen that density, void fraction, and hardness of the composites improved with fly ash content. The strength and modulus of the composites increased with filler content up to 10 wt.%. For the analysis of the homogeneityof composites, the storage modulus, loss modulus, and the cole-cole plot are drawn from dynamic mechanical analysis. Finally, a three-body abrasive wear test is conducted for composite samples, in a steady-state abrasive wear condition up to10 wt.% fly ash filled composites shown better wear resistance with the variation in sliding distance and normal load. TheTaguchi’s design of experiment method is used for designing of experimental runs having input controlling variables likesliding distance, normal load, filler content, and abrasive size.

A Comparative Study of the Physical, Mechanical and Thermomechanical Behavior of GFRP Composite Based on Fabrication Techniques

Mahavir Choudhary,Ankush Sharma,Maheshwar Dwivedi,Amar Patnaik 한국섬유공학회 2019 Fibers and polymers Vol.20 No.4

The present study investigates the effect of fabrication techniques on the mechanical and thermo-mechanicalbehavior of bi-directional woven glass fiber epoxy composite for wind turbine blade application. The composites arefabricated by Vacuum Assisted Resin Transfer Molding (VARTM) and hand lay-up molding (HLM) techniques to identifythe optimal performance output. The physical, mechanical and thermo-mechanical properties of the composites are evaluatedfor the samples fabricated by both the tecniques. It is observed that tensile strength, inter-laminar shear strength (ILSS) andflexural strength of the composites fabricated by VARTM technique are 405.62 MPa, 23.35 MPa and 239.3878 MParespectively whereas composites fabricated by HLM technique shows slightly lower tensile strength (351.28 MPa), ILSS(16.75 MPa) and flexural strength (221.92 MPa). The intra-laminar mode-I fracture toughness test is also performed usingcompact tension specimen. The critical stress intensity factor (KIC) and critical strain energy release rate (GIC) are observed tobe higher for VARTM composites. At the end, the dynamic mechanical analysis is performed to understand the materialbehavior and structural characteristics of these composites in high-temperature environment. This investigation purelygoverns the small-scale wind turbine blade structure in two different extreme climates from ambient to sustainabletemperature.

Mechanical, Thermal and Thermomechanical Properties of Sponge Iron Slag filled Needle-Punched Nonwoven Jute Epoxy Hybrid Composites

Ankush Sharma,Mahavir Choudhary,Pankaj Agarwal,Shivam Joshi,S.K. Biswas,Amar Patnaik 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4

In the present research work, the needle-punched nonwoven jute epoxy composites are fabricated by varying theweight percentages of sponge iron slag in vacuum assisted resin transfer molding technique. This study examines thephysical, mechanical and thermomechanical properties (i.e., density, water absorption, tensile, flexural, inter-laminar shearstrength, compression, impact, fracture toughness and dynamic mechanical analysis) of unfilled and 8 wt.%, 16 wt.% and24 wt.% of sponge iron slag filled composites under controlled operating conditions. Moreover, it is shown that all themechanical properties improved with the increased in sponge iron slag content except for tensile strength which increasedonly upto 16 wt.%. This study also attempted for the analysis of thermal conductivity of the unfilled and particulate filledcomposites in experimentally by hot disc method. This work also presents both existing empirical models and numericalsimulation analysis to evaluate the thermal conductivity of the developed composites. The numerical simulation values of thethermal conductivity demonstrated good agreement with the experimental values. At the end, Cole-Cole plot is drawnbetween loss modulus and storage modulus to understand the nature of the proposed composites.

Experimental and Numerical Analysis of Mechanical, Thermal and Thermomechanical Properties of Hybrid Glass/Metal Fiber Reinforced Epoxy Composites

Pankaj Agarwal,Mukesh Kumar,Mahavir Choudhary,Ankush Sharma,Amar Patnaik 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5

This work clearly demonstrates the effective utilization of industrial waste metal fiber to replace glass fiber loadingfor the development of hybrid glass/metal fiber reinforced polymer composites for marine applications. The presentcomposite is fabricated by vacuum assisted resin transfer modelling technique under controlled conditions by varying bothglass fiber and metal fiber in a desired percentage weight ratio. The fabricated hybrid composites are characterized byphysical (density and void content), mechanical (tensile strength, flexural strength, inter-laminar shear strength and impactstrength), thermomechanical analysis (storage modulus, loss modulus and damping factor), water absorption, thermalconductivity and thermo-gravimetric analysis respectively. The second part of this study mainly covers the simulationanalysis of both mechanical properties and the thermal conductivity of the hybrid polymer composites. This analysis mainlyhelps to understand the major causes affecting during experimental analysis along with finding the desired results bycomparing them with the experimental results. The last part of this analysis focuses on studying the composite defects duringmechanical characterization with the help of scanning electron microscope. Finally, adopted multicriteria decision-makingtechnique to optimize the process parameters by considering all the obtained experimental results to satisfy the proposedapplication specifically can be used for marine structure development.