M S Bhagyashekar
@rrce.org
Former Principal
Rajarajeswari College of Engineering
Dr. Mysuru Siddalingappa Bhagyashekar, Professor, Administrator, Mentor, and Guide obtained his B.E in Mechanical Engineering from Bangalore University(1988), PG Diploma in Industrial Pollution Management from National Institute of Environment, Lucknow (1992) M.Sc. Engg (by Research) in mechanical engineering with research on composite materials from SJCE, Mysore, Mysore University (1997) and Ph.D. in Mechanical Engineering with research on polymer composites at NAL from Bangalore University (2007).
Dr. MSB has a total of 30 years of rich experience in Academics, Research and Administration and is associated with “Research Centers” at DBIT and RRIT and working on Development and characterization of polymer composites and materials for energy systems. He has published more than 58 research publications in refereed journals and conferences and edited 8 conference proceedings. He is a Professional Member of Indian Society of Theoretical and Applied Mechanics, Indian Society for Advancement of Materials and Processing Engineers, Indian Institute of Production Engineers, Indian Society for Technical Education and IAENG and is Editorial Board Member of International Journal of Advanced Mechanical Engineering and guest reviewer of journal of Minerals and Materials Characterization and Engineering.
EDUCATION
Ph.D. Mechanical Engineering
RESEARCH INTERESTS
Composites
Scopus Publications
Scopus Publications
Mohammed Asadullah, M. S. Bhagyashekar, and Mohammed Yunus
Springer Science and Business Media LLC
Pavan Kumar REDDY and M S BHAGYASHEKAR
Journal of Thermal Engineering
B. N. Venkatesha and M. S. Bhagyashekar
Springer Singapore
C.R. Prakash Rao, M.S. Bhagyashekar, P. Chandra, and D.V. Ravikumar
Elsevier BV
Abstract Metal Matrix Composites (MMC’s) reinforced with silicon carbide are preferred for automobile, aviation and marine application owing to its strength to weight ratio however these parts requires turning operation. The turning operation is intended to convert raw materials in to the final output having the desired quality in terms of component dimension and surface roughness. The desired quality of the components can be obtained by proper selection of parameters during turning MMCs. Hence present research paper is aimed at the study of the surface roughness while turning MMC’s using CGGN120304 style, K10 grade uncoated tungsten carbide inserts. The cutting speed selected was 300m/min, 450m/min and 600m/min, feed of 0.08 mm/revolution, 0.16 mm/revolution, 0.24 mm/revolution and constant radial depth of cut of 1.5 mm. Experiments were conducted following ISO3685 standards. The Surface roughness was measured using SJ201P surface roughness measuring equipment. The experimental results revealed that while turning composites, Surface roughness were found lower when 600 m/min and 0.08 mm/revolution were used for machining. The cutting edges were subjected to high BUE at 0.08 mm/rev at all cutting speeds.
C.R. Prakash Rao, M.S. Bhagyashekar, M.S. Rajagopal, and M. VedaVyasa
Elsevier BV
Abstract Metal Matrix Composites (MMCs) are adopted to fabricate machine parts and automobile parts owing to its properties, however the MMCs are required to be machined to obtain final component. While turning these MMCs, the cutting tools fail due to notch wear followed by built up edge and macro chipping which leads to increase of cutting force and surface roughness. Hence present research paper is aimed at study of the cutting force and surface roughness while turning Al6061 Fly ash composite using CGGN120304 style, edge rounded carbide inserts. The cutting speed selected was between 150m/min to 650m/min in steps of 125m/min, feed of 0.15 mm/revolution, 0.2 mm/revolution, 0.25 mm/revolution and constant radial depth of cut of 1.0 mm. Experimentation were carried out following ISO3685 standards. The experimental results revealed that while turning composites, Surface roughness, Cutting force and burr folding were found lower when K10 grade carbide insert used with lower edge rounding. Cutting edges was found intact with 80 micron and 100 micron edge rounding at all machining parameters.
K. Srinivas and M.S. Bhagyashekar
Elsevier BV
Abstract The present study reports the enhancement of thermal conductivity of epoxy and its composites containing metallic micro particulates of Al, Cu and hybrid (Al-Cu) particulates. The filler fractions were varied from 10% to 40% by weight for all the three composites systems. Investigations showed that increased particulate content enhances the thermal conductivity of epoxy. Further, epoxy composites having hybrid (Al-Cu) fillers exhibits higher thermal conductivities than epoxy composites filled with mono fillers Al/Cu alone. Analytical models to predict thermal conductivity such as Maxwell, Hashin, Nielsen, and series were used to compare thermal conductivity found by experiment. Thermal conductivity predicted by some of the analytical models is in agreement with thermal conductivity determined by experiment.
Anish Johns, M. P. Sham Aan, Jobish Johns, M. S. Bhagyashekar, Charoen Nakason, and Ekwipoo Kalkornsurapranee
Springer Science and Business Media LLC
This manuscript presents a continuation work on a simple system to vulcanize natural rubber using glutaraldehyde as a cross-linking agent. Natural rubber latex consists of protein which is allergenic to human body. The protein immobilization behavior of glutaraldehyde is of greatest interest to conduct this study. A study to determine the optimum condition for the vulcanization of the newly introduced system was carried out using glutaraldehyde as a cross-linking agent. Efforts were made to find out the best combination of glutaraldehyde and ammonia to vulcanize natural rubber latex with superior physical properties. Direct vulcanization method was employed to prepare natural rubber vulcanizates from natural rubber latex. The mechanical performance of the vulcanized natural rubber was determined for various combinations of ammonia and glutaraldehyde. Superior tensile properties were observed for the vulcanized rubber prepared from a very high ammonia natural rubber latex. The activation energy of the degradation of the vulcanizates was determined from thermogravimetric analysis. The cross-link density of the vulcanized rubber was determined from swelling experiments in toluene. The very high ammonia natural rubber latex (0.9 wt% ammonia) with 15 mL of 10 wt% glutaraldehyde solution was found to be the effective combination to vulcanize natural rubber latex with excellent properties. Advantage of this technique is the possibility of directly vulcanizing natural rubber latex at low temperature.
CR Prakash Rao, MS Bhagyashekar, and Narendra Viswanath
Elsevier BV
Abstract Composites made of light materials are of great interest and this material replaces almost all the monolithic materials while posing challenges for machining. While machining these composites, the failure of cutting tool is attributed for the presence of hard particles in the work materials. Further, cryogenic treated cutting tools are recognized for machining of monolithic materials. Thus, present paper presents the results on tool life of cryogenically treated and untreated K10 grade carbide inserts while machining Al6061-fly ash composites containing 0-15 percent reinforcement in steps of 5. Intermittent facing operation were carried out with the cutting speed of 220m/min, 314m/min & 446m/min, by using the feed rate of 0.06 mm/revolution, 0.12 mm/revolution, 0.24 mm/revolution with a depth of cut of 2 mm following dry machining method. Parametric studies have been carried out as per ISO3685 standards. The results reveal that cryogenically treated tungsten carbide inserts exhibits higher toughness & improved wear resistance when compared to untreated tungsten carbide inserts.
K. Srinivas and M.S. Bhagyashekar
Elsevier BV
Abstract This paper presents the tribological behaviour of epoxy composites containing three different particulate fillers. The RT cured epoxy composites subjected to post cure cycle containing particulate Gr, SiC and Gr-SiC of length 25 mm and diameter 10 mm were the pin specimens and EN31 steel was the disc of the computerized pin on disc wear tester. The results show that the synergic effect of hybrid filler Gr-SiC is to improve the wear resistance when compared with that of Gr/SiC. The improvement in wear resistance for the composite containing 5%SiC 35%Graphite is 85% when compared with epoxy, 25% over composite containing 40%Gr and 36% over 40%SiC. The composites containing 5% Gr and 35% SiC exhibits highest wear resistance.
C.R. Prakash Rao, M.S. Bhagyashekar, and Narendraviswanath
Elsevier BV
Abstract Metal matrix composites being used in automobile, aviation, naval, space and other structural applications because of their unique balance of physical and mechanical properties. The metal matrix composites are produced using diverse technologies in order to meet the market demand such as lower density, higher wear resistance, thermal stability at lower cost per component. Composite materials replace almost all the monolithic material while posing challenges for machining hence are graded as difficult to machine materials. The hetrogeneous structure of the composite materials leads to the failure of cutting tool during machining composites are mainly attributed for the presence of hard particles which leads to higher surface roughness value. Thus, present paper presents the results on surface roughness values of K10 grade carbide and Poly Crystaline Diamond (PCD) inserts while turning Al6061-flyash composites containing 0% to 15% fly ash in step of 5%. Parametric studies have been carried out as per ISO3685 standards following dry machining condition. The machining parameters are cutting speeds of 300m/min to 600m/min in step of 100m/min, feed of 0.06 mm/revolution to 0.24 mm/revolution in step of 0.06 mm/revolution using a constant depth of cut of 1.2 mm which is equal to three times to the nose radius of the cutting tool. The results revealed that PCD inserts exhibits lower surface roughness while turning composites containing 10% filler material when compared with that of K10 grade tungsten carbide insert.
B.N. Venkatesha and M.S. Bhagyashekar
Elsevier BV
Abstract The AA6061 and AA6063 metal plates are Friction stir welded to obtain butt joints, Microstructure, Microhardness and tensile strength in the weld examined. The Microstructure evaluation of AA6061 shows that the Fusion with parent metal is good, Grains are slightly elongated at the heat affected zone and Microstructure evaluation of AA6063 shows that grains are severely elongated at HAZ. Vickers Microhardness evaluation of AA6061 shows that after Friction Stir welding (FSW) at parent metal Vickers Microhardness slightly higher than weld zone. Vickers Microhardness is high at HAZ for AA6061. Vickers Microhardness of AA 6063 at the weld region is higher than HAZ, Parent metal. Vickers Microhardness of AA6063 is higher than AA6061 before and after Friction Stir welding. Ultimate tensile strength of AA6061 is greater than AA6063 both before and after FSW.
M.S. Bhagyashekar and R.M.V.G.K. Rao
SAGE Publications
Studies were carried out on RT cure epoxy (LY556+HY951) composite system comprised of metallic and non-metallic fillers. The results of the studies carried out on composites with three distinctly different particulate fillers, representing ductile (Cu and Al), brittle (SiC), and soft (Gr) type of materials regarding the mechanical properties, showed that the tensile and flexural strength of the particulate composites degraded with filler loading, whereas the modulus (both tensile and flexural) of the composites increased with the filler loading for the range of filler contents considered (10—40 wt%). The compression strength of all the composites increased to a maximum up to a filler loading of 30% and then decreased beyond this value, with the SiC-Ep composites exhibiting the highest improvement in the compression strength.
M.S. Bhagyashekar, Kavaitha Rao, and R.M.V.G.K. Rao
SAGE Publications
Studies were carried out on RT cure epoxy (LY556+HY951) composite system comprising of metallic and non-metallic fillers. The results of the studies carried out on the composites containing three distinctly different particulate fillers, representing metallic (Cu and Al), ceramic (SiC) and solid lubricant Gr materials showed that the viscosities of the composite formulations (slips) increased with increased filler loading for a given composite. The composite formulations containing Gr and SiC exhibited respectively the highest and lowest increments in their viscosities. Further, the densities of these composites increased with increased filler content, in the order of respective densities of the fillers used. Also, the hardness of the composites increased with the increased filler content, except for the Gr filled composites, which showed an opposite trend.
M.S. Bhagyashekar and R.M.V.G.K. Rao
SAGE Publications
Studies were carried out on a RT-cure epoxy (LY556 + HY951) composite system filled with the Al and Cu particles. Results showed that the wear loss and COF of both the composites increased with sliding distance and contact load for the range of filler content considered. Further, it was observed that the Cu-Epoxy composite exhibited superior wear resistance compared to the Al-Epoxy composites. From the experimental data, a ``wear endurance index'' was identified which can serve as a parameter to assess the long term wear life (residual wear life) of these composites.
M.S. Bhagyashekar and R.M.V.G.K. Rao
SAGE Publications
Studies were carried out on a (RT) cure epoxy (LY556 + HY951) composite system comprising of silicon carbide (SiC) and graphite (Gr) particulates. Results showed that the wear resistance and coefficient of friction of both the composites increased with sliding distance and contact load (contact pressure) for the range of filler contents (5—40% wt) considered. The Gr-composite exhibited its distinct (superior) tribological feature compared to the SiC-composite. A wear endurance index has been identified from the experimental data, to serve as a parameter to assess the long term wear life (residual wear life) of these composites.