Gobalakrishnan B
@care.ac.in
Assistant Professor/ Mechanical Engineering
CARE College of Engineering, Trichy
EDUCATION
BE., Mechanical Engineering,
ME., Manufacturing Engineering
Ph.D Manufacturing Engineering
RESEARCH INTERESTS
Composite Materials
Scopus Publications
Scopus Publications
B. Gobalakrishnan, C. Rajaravi, S. Maheshwaran, and J. Muthukumar
Springer Nature Singapore
J. Muthukumar, K. Santhy, S. Maheshwaran, and B. Gobalakrishnan
Springer Nature Singapore
C. Rajaravi, B. Gobalakrishnan, R. Ganapathi Srinivasan, and B. Ganesh
Elsevier BV
C. Rajaravi, B. Gobalakrishnan, Ganapathi Srinivasan, S. Palani, and Karthik
Springer Nature Singapore
C. Rajaravi, B. Ganesh, S. Lakshmanan, and B. Gobalakrishnan
Elsevier BV
C Rajaravi, U Elaiyarasan, B Gobalakrishnan, and R Ganapathy Srinivasan
IOP Publishing
Abstract Aluminium and its alloys are widely used for fabricating components are used in aircraft, automobile, defence and structural applications. Due to its light weight and high strength, it is applied in the various commercial purposes such as window, doors, construction member etc. However, machining of aluminium alloys using conventional machining methods is difficult. In this present investigation, an endeavour has been made to drill TiB2 in situ aluminium metal matrix composite alloy developed using stir casting method. During the casting two different salts namely K2TiF6 and KBF4 are added with matrix materials to form TiB2. The paper is studied the surface roughness (SR) of drilled TiB2 in situ aluminium metal matrix composite viz speed, feed rate and TiB2 addition. Empirical relationship is developed for SR in order to identify the dominating factors. The percentage contribution of SR is 96.35% that showed the empirical model is adequate. The normal probability plot showed the points of residuals are equally distributed over the straight line. The lack of fit value was 3.65 which is less than the standard point. Therefore, the SR model is satisfactory. SR increased with increasing of speed, feed rate and addition of TiB2. The removal of TiB2 particles causes small pits and voids due to the inclusion of reinforcement. The minimum SR was achieved at lowest speed (1260 rpm), feed rate (0.05 mm rev−1) and TiB2 addition (2%). As speed and feed increased, the surface hardness increased.
B. Gobalakrishnan, C. Rajaravi, Gobikrishnan Udhayakumar, and P. R. Lakshminarayanan
Springer Science and Business Media LLC
B. Gobalakrishnan, C. Rajaravi, Gobikrishnan Udhayakumar, P.R. Lakshminarayanan, and M. Sivanesh Prabhu
Elsevier BV
Abstract In the present work, synthesized composite of aluminium matrix composite reinforced with 8 wt% of TiB2 particles and the base Al6061 alloy were fabricated by stir casting method and secondary worked with cold extrusion die. The billets were prepared for the dimension of diameter 18 mm and length 90 mm. specimens were subjected to cold extrusion process with extrusion ratio of 1.2656 under laboratory condition. The mechanical properties such as Rockwell hardness tensile strength were determined as per the ASTM standard E08-16 and ASTM standard ASTM E18-15. It was found that the extruded composites revealed superior mechanical properties as compared to as-cast composites and base metal. To determine the particle distribution and its size, scanning electron microscope (SEM) and optical microscope (OM) have been carried out for microstructural study. Also, Energy Dispersive X-ray (EDX) and X-ray Diffractometer (XRD) were studied to confirm the presence of TiB2 particles in the fabricated samples. The experimental results were validated through Finite Element Analysis (FEA) using ANSYS 14. The predicted mechanical results attained by FEA are in good agreement with the experimental results.
C. Rajaravi, B. Gobalakrishnan, and P. R. Lakshminarayanan
Walter de Gruyter GmbH
AbstractThe effect of pouring temperatures of an ex situ (Al/SiCp) and in situ (Al/TiB2) metal matrix composites (MMCs) synthesized using stir casting method were studied. The Al/SiCp composite were fabricated by mixing of 6wt.% of SiCp into cast A356 aluminium alloy melt and poured at diverse pouring temperatures (730∘C, 750∘C and 770∘C). The Al/TiB2 MMCs were obtained by melting A356 aluminium alloy and mixing of KBF4 and K2TiF6 precursor salts whose stoichiometric ratio composition corresponds to 6wt.% of TiB2 reinforcement and other parameters were constant (stirring speed 300 RPM and holding time 30 minutes). The composite melt was poured into the permanent mould with varied pouring temperatures (800∘C, 820∘C and 840∘C). Coarser and homogenous SiC particles were presented in the Al/SiCp MMCs, whereas, finer and uniformly distributed TiB2 particles were appeared at the MMCs of Al/TiB2. The mechanical properties viz. tensile strength, fracture toughness and hardness of Al/SiCp and Al/TiB2 MMCs were experimentally determined as per the ASTM standards and compared. Higher tensile and fracture strength were occurred at the MMCs of Al/TiB2 as compared to Al/SiCp MMCs and base alloy of aluminium as well. Maximum hardness was attained at the pouring temperatures of 820∘C and 750∘C in the MMCs of Al/ TiB2 and Al/SiCp, respectively.
Balachandran Gobalakrishnan, P. Ramadoss Lakshminarayanan, and Raju Varahamoorthi
Walter de Gruyter GmbH
Abstract The synthesis of Al/TiB2 metal matrix composite using the in situ technique has been performed in the present study. Two halide salts, namely potassium hexa fluro titanate (K2TiF6) and potassium tetra fluro borate (KBF4) were introduced into an Al 6061 melt at 820 °C adding different amounts of TiB2 particles, i. e. 4, 6 and 8 wt.-%. The stirring and holding times were maintained for all the casts at 30 minutes. The metal matrix composites were tested with respect to tensile strength and hardness in the as-casted condition. Tensile strength and hardness were found to increase with an increase of TiB2. The size and uniformity of the TiB2 particles in the composites was corroborated with scanning electron microscopy (SEM) and X-ray diffractometry (XRD), confirming the presence of TiB2 in the composites.
B. Gobalakrishnan, P. R. Lakshminarayanan, and R. Varahamoorthi
American Scientific Publishers
B. Gobalakrishnan, P. R. Lakshminarayanan, and R. Varahamoorthi
American Scientific Publishers