Bhiksha Gugulothu
@bhu.edu.et
Associate Professor of Mechanical Engineering (Adv. Mfg. Systems), Department of Mechanical Engineering
Bule Hora University
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Bhiksha Gugulothu, P. S. Satheesh Kumar, N. Srinivasa Rao, S. Vijayakumar, D. R. Rajkumar, T. V. Janardhana Rao, and M. Naga Swapna Sri
Springer Nature Switzerland
Bhiksha Gugulothu, Pankaj Sharma, N. Pragadish, V. Vidyapriya, and H. Venkatesan
IGI Global
In the last decade, there has been an increase in interest in electrical discharge machining (EDM)'s innovative applications, with a focus on this technology's potential for surface modification. Along with the erosion of the work material during machining, the inherent nature of the operation also causes some tool material to be lost. The surface composition after machining and, subsequently, its characteristics are influenced by the formation of plasma channel, which is composed of material vapours from the eroding work material and tool electrode, and pyrolysis of dielectric. Under appropriate machining circumstances, deliberate material transfer can be accomplished by distributing metallic powders in the dielectric or utilizing composite electrodes, or by combining the two. This study provides an overview of the phenomena of surface modification by electric discharge machining as well as potential future directions for its use.
Bhiksha Gugulothu, N. Aravindan, Gunawan Widjaja, S. A. Lakshmanan, and M. Suresh
IGI Global
This chapter describes the basic working principle of electrical discharge machining. The impacts of both significant and insignificant machining parameters were also detailed. Also, the purpose, properties, and types of dielectric fluid were discussed to better understand the process. This chapter is concluded with describing the benefits of flushing with its types. The rapid impedance of cold dielectric fluid causes an explosive evacuation of molten metal from the electrode and workpiece surfaces. This results in the formation of a tiny crater on the surfaces of the two conductors, which hardens hollow balls of material that are subsequently drained from the gap by the fluid.
Bhiksha Gugulothu, N Nagabhooshanam, M Arun, N Vinayaka, Pravin P Patil, and K V S R Murthy
IOP Publishing
Abstract In this research Manihot esculenta (cassava) tuber stem microcrystalline cellulose (MCC) and woven bamboo fiber (WBF) reinforced unsaturated polyester (UP) composites are prepared and tested. The main aim of this study was to synthesis the microcrystalline cellulose from Manihot esculenta tuber stem and investigate the mechanical, wear and hydrophobic properties of UP resin composite made using MCC and WBF. The laminated composites were prepared by the hand layup method and characterized according to ASTM standards. According to the results, the composite containing 40 vol% of WBF increased the tensile strength and modulus, flexural strength and modulus, interlaminar shear strength, Izod impact as well as hardness by 39%, 10%, 42%, 27%, 1%, 91%, and 1%, respectively as compare to pure polyester resin composites. In comparison to all composites, the composite with 4 vol% of MCC exhibits the lowest sp. wear rate of 0.011 mm3/Nm. The water absorption contact angle indicated that all composite designations had a wider contact angle of more than 70°, which indicates a stronger hydrophobicity of composites. The SEM fractography reveals improved bonding and toughness for 4 vol% of MCC and WBF reinforced UP composites. Such mechanically stronger, wear resistance, as well as high hydrophobic composites, could be used in aerospace, automobile, defence and industrial sector.
Bhiksha Gugulothu, Srikanth Karumuri, S. Vijayakumar, B. Muthuvel, Suresh Seetharaman, S. Jeyakrishnan, and Kuldeep K. Saxena
Springer Science and Business Media LLC
Bhiksha Gugulothu, Rajasekaran Saminathan, A. Pradeep, Ankit Sharma, S. Vijayakumar, Prabhu Paramasivam, and N. Srinivasa Rao
Informa UK Limited
Bhiksha Gugulothu, K. Bharadwaja, S. Vijayakumar, T. V. Janardhana Rao, M. Naga Swapna Sri, P. Anusha, and Manoj Kumar Agrawal
Springer Science and Business Media LLC
Bhiksha Gugulothu, P. Anusha, M. Naga Swapna Sri, S. Vijayakumar, R. Periyasamy, and Suresh Seetharaman
Hindawi Limited
Stir-squeeze casting (SSC) is the appropriate and inexpensive technique for producing aluminum hybrid matrix composites as it creates a uniform distribution of reinforcements in the composite with finer grains. Al7475 is a lightweight castable alloy that possesses enough hardness and strength with applications in automotive and aerospace. This research work examines the effect of process parameters for Al7475/Al2O3/B4C/TiB2 hybrid matrix composites produced by the stir-squeeze casting methodology. As per Taguchi design L16, four parameters with four levels were selected in the optimization process of SSC are stir speed (SD) of 300-450 rpm, melting temperature (ME) of 750–900°C, squeeze pressure (SE) of 50-125 MPa, and reinforcement (RT) of 2-8 wt%. The mechanical properties such as tensile strength (TS) and hardness (HN) are studied by the variation of each process parameters levels. The optimization results on TS and HN are predicted by Minitab-17 Software. It is observed that maximum TS of 325 MPa and HN of 130.6 Hv are attained at experiments L1 and L7, respectively. From the SN ratio result, the TS value is improved at the parameter level of RT2-SE4-ME2-SD4. The ANOVA result exposed that reinforcement is the most significant factor for enhancing tensile strength which contributes 38.9%, followed by squeeze pressure of 28.4%, stir speed of 13.6%, and melting temperature of 12.16%.
Rakesh Koppunur, Kiran Kumar Dama, Uzwalkiran Rokkala, Balaji Thirupathi, N. V. S. S. Sagar, and Bhiksha Gugulothu
Hindawi Limited
Patient-specific implants are well known for fixing the fracture for bone repairs. However, the exact fixation of the fabricated implant to the patients is a challenging task. To overcome this problem, in the present study two kinds of designs are developed and fabricated. Based on the exact fitting to the patient’s oral system, the best design is selected to fabricate. Computed tomography (CT) scan data of the patient oral anatomy is converted into a 3D model using the DICOM Software “Slicer 3D.” The patient-specific maxillofacial implant is fabricated using fused filament fabrication (FFF) and direct metal laser sintering (DMLS) techniques. Before fabricating real time product, a prototype is fabricated at the initial stage using FFF. Later, stress distribution and displacement of the implant was investigated using a FEM simulation. The conclusion of the present work results are potential for FFF of patient-specific implants out of Ti-6Al-4V.
A. U. Rao, K. Ramasamy, A. Pradeep, P. S. Satheesh Kumar, Srikanth Karumuri, and Bhiksha Gugulothu
Hindawi Limited
This research concentrated on material characteristics such as tensile property (TS) and hardness (HV) for AA-5083 manufactured using the stir casting (SC) process. The reinforcing elements silicon carbide (SiC-7.5%) and flyash (FA-5%) in the form of powders will be added to Al alloy to improve the characteristics of composites. Response surface methodology (RSM) was a scientific technique to make optimizing task at stir casting parameters. As per central composite design (CCD), 20 samples (L1-L20) were fabricated at a variation of factors such as stirrer speed (A) 350-550 rpm, stir time (B) 15-35 min, and stir temperature (C) 750-950°C. The result presented that best TS and HV exhibited at experiments L5 (A2-450 rpm, B1-15min, and C1-750°C) and L6 (A1-350 rpm, B1-15min, and C1-750°C). Design expert software (DES) is one of the optimization tools that employed to determine analysis of variance (ANOVA) and the best optimal parameter levels of SC. ANOVA helped to check contribution of SC factors on TS and HV, and it was noticed that mechanical properties were improved with increasing stir speed and stir time but it was reduced with rising of temperature.
G. Boopathy, V. Vanitha, K. Karthiga, Bhiksha Gugulothu, A. Pradeep, Hari Prasadarao Pydi, and S. Vijayakumar
Hindawi Limited
The mechanical properties of different polymer matrix composites are discussed in this research study. These composites are multiphase materials in which reinforcing elements and a polymer matrix are suitably combined. The mechanical properties of 18 PMCs, including nylon 66 reinforced with 5, 15, and 25% wt% silicon carbide (SiC) and nylon 66 reinforced with 5, 15, and 25% wt% boron carbide (B4C), were evaluated using an injection moulding technique at three different injection pressures in this study. The optimization of process parameters like reinforcement material, reinforcement quantity, and injection pressure to maximize the tensile and impact strength of nylon 66 composites are the main focus of this study. It is observed that the specimens 25% SiC with an injection pressure of 90 MPa has optimised tensile strength, while the specimen 5% B4C with an injection pressure of 90 MPa has optimised impact strength.
Bhiksha Gugulothu, N. Nagarajan, A. Pradeep, G. Saravanan, S. Vijayakumar, and Janardhana Rao
Hindawi Limited
This work concentrated on preparation of Al-based composites through stir casting process. Al6082 was chosen as base material that is reinforced with zirconium silicate and titanium carbide. As per Taguchi design L16 orthogonal array, specimens are produced with variation of casting parameters for performing tensile and hardness test. In this process, ZrSiO₄ is kept constant to 10 wt%, whereas TiC concentration varied from 2.5 to 10wt%. For analyzing the properties of optimized stir cast samples for AA6082/ZrSiO4/TiC, three input variables with four levels are taken such as Stir speed (SS) 300-750 rpm, Stir time (ST) 5-20 min, and Reinforcement (RI) 2.5-10 wt%. The Taguchi technique was used as an analyzer to determine optimal parameter on Tensile Strength (TS) and Hardness (HN). The Minitab-17 software is assisting to find analysis of variance (ANOVA), regression equation, and contour plots of the selected parameters. Finally, it is witnessed that SS (65.9%) is the maximum influenced factor that increases TS, followed by RI (23.1%) and ST (11%). The best combinations of parameters on TS and HN were found at SS2-ST1-RI2 (450 rpm, 5 min, and 5wt%) and SS3-ST2-RI4 (600 rpm, 10 min, and 10wt percent), respectively. From the contour plots, the casting variables SS (600-650 Rpm), ST (15-17.5 min), and RI (5-8 wt%) were proposed for achieving excellent mechanical properties.
Bhiksha Gugulothu, Suresh Seetharaman, S. Vijayakumar, and D. Jenila Rani
Elsevier BV
Bhiksha Gugulothu, S. Lakshmi Sankar, S. Vijayakumar, Adina Srinivasa Vara Prasad, M. Thangaraj, M. Venkatachalapathy, and T.V.Janardhana Rao
Hindawi Limited
The present study deals with preparation of Al hybrid metal matrix composites by the stir casting technique. In this work, Al5052 alloy was selected as the main metal which reinforces with zirconium dioxide and aluminium oxide. The wear test has been conducted on the POD apparatus. 9 specimens are produced by varying reinforcements’ percentage for conduction of tests. The amount of ZrO2 reinforcement is fixed to 8wt%, while the concentration of Al2O3 varied from 5wt% to 10wt%. The parametric optimization of wear behaviour is done through the Taguchi method with L9 orthogonal array. Minitab statistical software helped to find SN ratio and ANOVA reading for each parameter: load (N), sliding speed (rpm), and wt% of reinforcements. From the ANOVA outcome, the load parameter is the highest influencing element that improves wear resistance of made samples around 46%, followed by weight% of reinforcement 29% and sliding speed 26% as second and third influenced parameters, respectively.
Bhiksha Gugulothu, P. S. Satheesh Kumar, Bathula Srinivas, Alapati Ramakrishna, and S. Vijayakumar
Hindawi Limited
This study explained about machining parameters of Al5086/Flyash/Sic hybrid metal matrix composites by the Taguchi technique. Al5086 reinforced in SiC (5–10 wt %) and 8% weight of flyash are retained as constants. The specimens are prepared with the help of the stir casting method. The material removal rate was examined by electrochemical machining under various parameters such as feed rate (0.15–0.30 mm/min), voltage (10–20 V), and electrolyte concentration (20–35 g/litre). Taguchi’s L16 orthogonal array was selected for design of experiments (DOEs), and 16 experimental tests were conducted to examine the effect of the selected machining parameters employed to identify the best optimal levels and also to investigate the effect of electrochemical machining parameters on MRR determined by Minitab-18.
S. Jayaprakash, S. Siva Chandran, T. Sathish, Bhiksha Gugulothu, R. Ramesh, M. Sudhakar, and Ram Subbiah
Hindawi Limited
Friction stir welding is an innovative welding process for similar and dissimilar joining of the materials effectively. FSW simply modified the grain structure and also improved the strength of the joints for any type of alloying elements. This experimental study planned to carry out the joining process for dissimilar materials such as aluminium alloys 5083 and 7068. Three different types of tools are involved to find the ultimate tensile strength and Vickers hardness. The tool types are straight cylindrical tool, taper cylindrical tool, and triangular tool. The process factors for this investigation are a rotational speed of 800, 1000, 1200, and 1400 rpm, welding speed of 30, 40, 50, and 60 mm/min, axial force of 3, 4, 5, and 6 kN, and plate thickness of 5, 6, 7, and 8 mm. The hardness value and the ultimate tensile strength were increased in the welding zone, which proves the effects of tool profiles are efficiently utilized.
Bhiksha Gugulothu, Desta Kalbessa Kumsa, and Minyahil Bezabih Kassa
Elsevier BV
Bhiksha Gugulothu, G. Krishna Mohana Rao, D. Hanuantha Rao, Desta Kalbessa Kumsa, and Minyahil Bezabih Kassa
Elsevier BV
M. Kavitha, V. M. Manickavasagam, T. Sathish, Bhiksha Gugulothu, A. Sathish Kumar, Sivakumar Karthikeyan, and Ram Subbiah
Hindawi Limited
Aluminium alloy is widely used in engineering application, and it can be classified based on the constituent elements or alloying elements. Aluminium alloy is preferred for the nature of its tensile strength, ductility, and corrosion resistance in this research to make a dissimilar friction stir welding joint of aluminium alloys 7079 and 8050 materials. The tensile strength of the weld joint is estimated by the influence of the response surface methodology approach. The welding is carried out by preferred process parameters with a tool speed of 1000–2500 rpm, tool pin diameter of 2–6 mm, welding speed of 50–300 mm/min, and tool shoulder diameter of 10–20 mm. The ANOVA analysis and the prediction of tensile strength were conducted efficiently. From the RSM analysis, the tool pin diameter mostly modified the output of the result.
Bhiksha Gugulothu, G. Krishna Mohana Rao, and Minyahil Bezabih
Elsevier BV
Bhiksha Gugulothu, G. Krishna Mohana Rao, and D. Hanumantha Rao
Elsevier BV
Bhiksha Gugulothu
Elsevier BV