Journal Articles
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/19884
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Item Influence of nano-aluminum-hydroxide on tribological, mechanical and flammability properties of E-glass fabric/epoxy multi-layered laminates(Huthig GmbH, 2014) Shivamurty, B.; George, G.; Bhat, K.U.; Anandhan, S.E-glass fabric/nano aluminum hydroxide (ATH)/epoxy composites were prepared by manual lay-up and compression molding. An image processing tool was used to quantify fineness of dispersion of nano-ATH particles in epoxy. Fourier transform infrared (FTIR) spectroscopy was used to understand the interaction between nano-ATH and epoxy. Mechanical properties, sliding wear resistance and fire retardance of these composites improved upon addition of nano-ATH. The composite containing 0.125 wt% of nano-ATH exhibited optimum mechanical properties and low specific wear rate.Item Mechanical properties and sliding wear behavior of jatropha seed cake waste/epoxy composites(Springer Japan, 2015) Shivamurty, B.; Murthy, K.; Joseph, P.C.; Rishi, K.; Bhat, K.U.; Anandhan, S.Jatropha seed cake particulate (JSCP)-reinforced epoxy composites were prepared by open mold resin casting method. The influence of JSCP on mechanical and dry sliding wear properties of epoxy was experimentally investigated as per the ASTM standards. Dry sliding wear test was conducted for these composites at a constant sliding distance of 500 m with different sliding velocities and applied loads by a pin-on-disc wear test machine. The results revealed that incorporation of JSCP decreased the specific wear rate and coefficient of friction while improving the mechanical properties. The composite reinforced with 40 wt% of JSCP exhibited better mechanical properties and wear behavior compared to the neat epoxy and other compositions of JSCP/epoxy composites. The results of this study indicate that jatropha seed cake powder can be used as biosolid lubricant filler for epoxy. © 2014, Springer Japan.Item Sliding wear and mechanical properties of alumina/glass fabric/epoxy composites(Huthig GmbH, 2015) Shivamurty, B.; Anandhan, S.; Bhat, K.U.In this study, laminates of neat glass fabric/ epoxy composite (GEC) and three levels of Al2O3 filled glass fabric/epoxy composites, designated as 3AGEC, 6AGEC and 9AGEC (micro particulates of Al2O3 - by 3, 6 and 9 wt. % of resin respectively) were prepared using hand lay-up method. 3AGEC exhibits higher tensile strength, flexural strength and flexural modulus besides improved hardness compared to GEC, 6AGEC and 9AGEC. 3AGEC exhibits the lowest specific wear rate compared to GEC, 6AGEC and 9AGEC at all the three loads (i.e., 15, 30 and 45 N) and at a constant sliding velocity of 3.5 m· s-1 for a sliding distance of 1.5 km. It was found that beyond filler content of 3 wt. % is deteriorates the mechanical and sliding wear properties of the composites due to agglomeration of the filler. Also, it was found that lowest factor signifies lowest specific wear rate in both neat and all the Al2O3 filled composites.Item Elevated-Temperature Tribological Study of Interstitial-Free Steel Subjected to Shot Peening(Springer, 2025) Sahoo, B.; Bhat, K.U.The tribological behavior of steels at an elevated temperature plays a vital role in manufacturing processes like rolling, stamping, drawing, deep drawing, etc., where a prominent metal-to-metal contact demands a good wear resistance of the surface. The current investigation is based on improving the tribological behavior of interstitial-free steel by subjecting it to shot peening. The wear test was conducted at four different temperatures: 25, 100, 200, and 400 °C. The shot peening was done in two sets: conventionally shot peening and severe shot peening (SSP). The profile of the wear scar was analyzed in a profilometer, confirming the superiority of the SSPed sample in terms of smaller wear scar and lesser wear rate. Considering the temperature effects, the increase in wear resistance was more prominent at 400 °C due to the trace of thick oxide layers countering the ultrafine, fine oxide layers in the 200 and 100 °C wear conditions. The presence of protective ?-Fe2O3 layers and lubricative Fe3O4 layers was advantageous in the tribological aspect, contributing to the formation of a thinner wear scar and lower wear rate. A prominent trace of counter body material was also found in the debris generated at 400 °C wear condition. © ASM International 2024.Item Cumulative effect of FexN phases, roughness parameters, and asperity geometry on the anti-wear properties of low-temperature plasma nitrided Ti-Nb stabilized IF steel(Elsevier Ltd, 2025) Sahoo, B.; Bhat, K.U.Plasma-driven surface modification techniques like plasma nitriding (PN) are trending, especially for steel products. It is advantageous due to the higher order of process control and superior quality of property enhancement of the surface. This technique often employs a high processing temperature, which is one of its metallurgical and economical limitations. One of the renowned solutions is the implementation of lower processing temperatures. The current work is based on the low-temperature plasma nitriding of Ti-Nb stabilized interstitial-free steel at different processing temperatures ranging from 400 ºC to 500 ºC. The role of FexN phases, surface roughness parameters, and asperities geometry are thoroughly studied with respect to the anti-wear properties of the surface. The formation of ??-Fe4N and ?-Fe2–3N are detected in the XRD plot, whereas ??-Fe16N2 is confirmed in microscopy. The sample treated at 450 ºC presents the best anti-wear properties compared to other samples, primarily due to the presence of prominent ?-Fe2–3N phase and blunt surface asperities. A maximum reduction in wear volume of about 3 times the base value is recorded in the wear test. The microscopic and elemental analyses are conducted on the wear scars, wear debris, and counter-body worn-out surfaces to study the wear mechanism comprehensively. The work tries to illustrate the wear mechanisms schematically to understand the conceptual grounds associated with such theories. The spectrometric analysis in the depth direction is also performed, and it detects the trace of nitrogen up to about 7 µm depth for 500 ºC nitriding conditions. © 2025