SANTHA RAO DAKARAPU

@giet.ac.in

Professor of mechanical engineering
Godavari institute of engineering and technology

SANTHA RAO DAKARAPU


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https://researchid.co/dr.santharao

RESEARCH, TEACHING, or OTHER INTERESTS

Mechanical Engineering, Industrial and Manufacturing Engineering
9

Scopus Publications

199

Scholar Citations

7

Scholar h-index

7

Scholar i10-index

Scopus Publications

  • Parametric optimization of AA6061-Cu friction stir welded joints with boron carbide particle reinforcement
    Santha Rao Dakarapu, Sreenivasa Reddy Karri, Sai Kishore Neelakantam
    Materials and Manufacturing Processes, 2024
    The objective of this work is to improve the mechanical properties of friction stir welded square butt joints of AA6061 and pure copper employing activated flux of B4C micro powder. Rotational speed, transverse feed and tool penetration depth were optimized using Taguchi method to produce joints devoid of defects. Rotational speed was found to be the most influential process parameter in achieving the higher ultimate tensile strength and has 49% contribution followed by feed and penetration depth. Model predictions for the optimal strength were validated and found to have 5 % variation. Highest ultimate tensile strength and micro Vickers hardness of 259.57 MPa and 98.58 HV respectively were obtained for joints made with speed, feed and penetration depth of 1250 rpm, 20 mm/min and 0.1 mm respectively. The microstructural analysis revealed that B4C particles were distributed uniformly in the stir zone which could be the reason for improved mechanical properties.
  • Effect of nanoparticle on mechanical properties of activated tungsten gas welding of austenite stainless steel 316L and optimization of process parameters
    Santha Rao Dakarapu, Praveena Chakravarthy Maddili, Krishna Mohan Revu
    International Journal of Materials Research, 2023
    Austenite stainless steel 316L was developed to improve corrosion resistance and is widely used in automobile components, thermal power plants, and pressure vessels due to their superior toughness and intergranular corrosion resistance. The austenite stainless steel 316L has a low carbon content of 0.03%, which helps in minimizing harmful carbide precipitation during welding. The joint strength of welded joints is poor unless proper care is taken. As a result, an attempt was made to use an activated Tungsten Inert Gas (A-TIG) welding procedure to improve the joint strength of butt welded joints of austenitic stainless steel 316L. The process parameters such as current, the volume of flow, and filler diameter were chosen in the study and generated an L 9 design matrix using MINI Tab software. The welded joints were prepared as per the design matrix using the activated flux of aluminum oxide nano powder as per the combination of process parameters. The mechanical tests such as tensile strength, hardness, and impact strength were evaluated and microstructural evaluation of welded joints was also assessed. The input parameters were optimized for better tensile strength of joints using Taguchi S/N analysis. It is found from the optimization that the highest ultimate tensile strength of 690.40 MPa was obtained at a current of 90 A, shielding gas flow of 13 l min–1, and filler material diameter of 2.5 mm. The model was also validated by conducting experiments.
  • Mechanical and water absorption properties of polymer composites reinforced with animal bone powder
    Santha Rao Dakarapu, Sreenivasa Reddy Karri, Lakshmana Sai Pradeep Ampolu
    Journal of Physics Conference Series, 2023
    This study investigates the mechanical properties of epoxy based composite material reinforced with natural filler of animal bone powder. The polymer composites were prepared using compression molding process. The plates of 6 mm thickness were prepared with varying amount of reinforcement from 0%, 5%, 10%, 15% and 20% by weight at varying compression loads at constant cure time. The mechanical properties such as tensile, flexural and impact strength, water absorption of composites were evaluated as per ASTM standards. The microstructural evaluations of samples were done using scanning electron microscope. It was found that the mechanical properties of epoxy composite materials reinforced with animal bone powder were significantly improved. The polymer composite of 15 wt.% bone powder reinforcement exhibited higher strength but possesses lower ductility. The scanning electron microscope analysis showed that particles were distributed uniformly in the matrix material.
  • Optimization of Laser Beam Welding Parameters for 90/10 Cupronickel Alloy Welds Using Taguchi Method
    Praveena Chakravarthy Maddili, Santha Rao Dakarapu
    Strojnicky Casopis Journal of Mechanical Engineering, 2022
    This study is to identify the most important control elements that will result in improve the tensile strength of Laser Beam Welded Cu-Ni 90/10 alloy joints. The different laser welding process parameters and levels were used for joining of Cu-Ni alloy. The process parameters like Laser Power (LP), Shielding Gas (argon) (SG), Focal Position (FP), & Welding Speed (WS) were chosen in the experimental study. The welding was carried on 4mm thick plate as per Taguchi’s experimental design. The mechanical properties were evaluated and microstructural observations were carried out. It was discovered that highest tensile strength of 234 MPa & hardness of 83 Hv were obtained which has 90 % and 87 % of the base material. The most influential optimal process parameters were determined using S/N analysis and the percentage contribution of each process parameter was estimated using ANOVA. It was found that laser power was influential parameter with a 64 % contribution in obtaining highest strength of laser welded joints. The experimental values and the results of the confirmation experiments were in good agreement.
  • Evaluation of mechanical properties of aluminium alloy (AA 6082) reinforced with Rice husk ash (RHA) and Boron carbide (B4C) hybrid metal matrix composites using stir casting method
    M.P. Chakravarthy, D. Santha Rao
    Materials Today Proceedings, 2022
  • Evaluation of Mechanical and Micro Structural Properties of Natural Fiber Reinforced Polymer Composites
    Rao D. Santha, Murthy O. Gopala Krishna
    Materials Science Forum, 2022
    Now- a- days the polymers are frequently used in domestic and industrial purposes. The properties of polymer composites are somewhat inferior and may be improved with the addition of filler and fiber materials. Jute is one of most economical natural fibres and is obtained primarily from plant materials such as cellulose and Lignin. Sisal is a vegetable, natural, fully biodegradable fibre and which has good specific strength and stiffness and is used for making ropes and twines. The banana fibre is the strongest natural fibres and is made from the stem of the banana tree which. exhibits good tensile strength and incredibly durable and bio-degradable. An attempt is made to improve the properties of polymer composites using jute, sisal and banana fibers and addition of 2 % titanium di boride as filler material. The polymer composites were made by hand layup method with epoxy as matrix material. The mechanical properties of fabricated composites such as tensile and impact strength, hardness were evaluated as per ASTM standards. It is found that tensile strength, hardness and impact strength were improved with the addition of fibers and filler material. The micro structural evaluation is also carried out using scanning electron microscope and found that particles were dispersed in the matrix material.
  • Improvements in mechanical properties of aluminium alloy-titanium di boride and boron carbide hybrid composite produced through friction stir processing route
    D. Santha Rao, Trinadh Shashank Simhadri
    Materials Today Proceedings, 2021
  • Mechanical and microstructural behaviour of aluminium/TiB2composites fabricated through multi-pass friction stir processing
    D. Santha Rao, B.N.V.S.K. Ganesh Gupta, T. Venkateswara Rao, J. Eswera Manikanta
    Materials Today Proceedings, 2021
  • Process parameters optimization for producing AA6061/TiB2 composites by friction stir processing
    Dakarapu Rao Santha, Nallu Ramanaiah
    Strojnicky Casopis Journal of Mechanical Engineering, 2017
    Friction stir processing (FSP) is solid state novel technique developed to refine microstructure and to improve the mechanical properties and be used to fabricate the aluminium alloy matrix composites. An attempt is made to fabricate AA6061/TiB2 aluminium alloy composite (AMCs) and the influence of process parameters like rotational speed, transverse feed, axial load and percentage reinforcement on microstructure and mechanical properties were studied. The microstructural observations are carried out and revealed that the reinforcement particles (TiB2) were uniformly dispersed in the nugget zone. The Tensile strength and Hardness of composites were evaluated. It was observed that tensile strength, and hardness were increased with increased the rotational speed and percentage reinforcement of particles. The process parameters were optimized using Taguchi analysis (Single Variable) and Grey analysis (Multi Variable). The most influential parameter was rotational speed in single variable method and multi variable optimization method. The ANOVA also done to know the percentage contribution of each parameter.

RECENT SCHOLAR PUBLICATIONS

  • Analysis and optimization of low-cost compression molding process for manufacture of particulate bone powder PLA composites
    SR Dakarapu, PC Maddili, JE Manikanta, N Ambhore, A Szántó, TI Erdei
    Discover Materials 6 (1), 46 , 2026
    2026
    Citations: 1
  • Computation of structural parameters developed by shot peening and their influence on residual stress and wear properties of AA2017 alloy
    JVSRD et
    Journal of Alloys and Compounds 1036, 1816050 , 2025
    2025
    Citations: 12
  • sustainable machining strategies for metal matrix composites :a comprehensive review
    RRM Eswer manikanta Javvadi , Santosh S, Nitin Ambhore,D.Santha Rao
    Engineering Research Express 7, 1-20 , 2025
    2025
    Citations: 3
  • Investigation of vegetable-based hybrid nanofluids on machining performance in MQL turning
    DSR Manikanta J.E., Ambhore N., Shamkuwar S., Gurajala N.K.
    Obrabotka metallov - Metal Working and Material Science 26 (4), 6-18 , 2024
    2024
  • Agriculture machine for seed plantation
    DSR et.
    Patent Design Grant 437375 , 2024
    2024
  • Optimization of process parameters for improvement of joint strength of dissimilar aluminum alloys by friction stir welding with an activated flux of titanium diboride
    SR Dakarapu, SR Karri, AK Shaik, PC Maddili, ND Chinta
    International Journal on Interactive Design and Manufacturing (IJIDeM) 18 (8 … , 2024
    2024
    Citations: 3
  • Optimization of compression ignition diesel engine combustion, emission, and performance characteristics at higher blends of biodiesel using RSM
    A Babji, G Rambabu, BN Dhanavath, LP Cheworei, DS Rao
    Process Integration and Optimization for Sustainability 8 (3), 953-973 , 2024
    2024
    Citations: 7
  • Parametric optimization of AA6061-Cu friction stir welded joints with boron carbide particle reinforcement
    SR Dakarapu, SR Karri, SK Neelakantam
    Materials and Manufacturing Processes 39 (5), 589-596 , 2024
    2024
    Citations: 4
  • PERFORMANCE OF COMPRESSION IGNITION ENGINE BY USING BIODIESEL AND DIESEL
    DSR al
    IIP Series , 2024
    2024
  • Improvement of Tensile Strength of Friction Stir Processed AA6086/Tic Surface Composite
    CSA Maddili Praveena Chakravarthy, Alapati Babji, D. Santha Rao
    TuijinJishu/Journal of Propulsion Technology 44 (4), 5610-5618 , 2023
    2023
  • Mechanical and water absorption properties of polymer composites reinforced with animal bone powder
    SR Dakarapu, SR Karri, LSP Ampolu
    Journal of Physics: Conference Series 2604 (1), 012004 , 2023
    2023
    Citations: 6
  • TIG welding of austenite steel
    DSR al.
    2023
  • Z-SOURCE CONVERTER WITH ULTRA GAIN FOR TRANSFORMER-LESS FUEL CELL INTEGRATED SINGLE PHASE GRID
    DSR al.
    2023
  • ANN BASED GRID INTERCONNECTION OF SOLAR PV SYSTEM WITH MULTIFUNCTIONAL GRID-INTERACTIVE CONVERTER
    DSR al.
    2023
  • IMPLEMENTATION OF ANFIS CONTROLLER TO IMPROVE HYBRID SYSTEM RELIABILITY
    DSR al.
    2023
  • Improvement of joint strength of dissimilar materials of aluminum alloy and copper using friction stir welding process with activated flux of boron carbide and Process …
    DSR al.
    2nd International Conference on Recent and Advanced Composite Materials … , 2023
    2023
  • Mechanical and water absorption properties of polymer composites reinforced with animal bone powder
    DSR al.
    5th International e-Conference onFrontiers in Materials Engineering … , 2023
    2023
  • Effect of nanoparticle on mechanical properties of activated tungsten gas welding of austenite stainless steel 316L and optimization of process parameters
    SR Dakarapu, PC Maddili, KM Revu
    International Journal of Materials Research 114 (4-5), 266-275 , 2023
    2023
    Citations: 2
  • Machine tools laboratory manual for mechanical engineers
    DSR al.
    2023
  • Experimental investigation on mechanical properties of kenaf and flax fiber reinforced epoxy composites
    DSR al.
    Advances in Nanomaterials and Composites, , 2023
    2023

MOST CITED SCHOLAR PUBLICATIONS

  • Process parameters optimization for producing AA6061/TiB2 composites by friction stir processing
    DR Santha, N Ramanaiah
    Strojnícky časopis-Journal of Mechanical Engineering 67 (1), 101-118 , 2017
    2017
    Citations: 42
  • Evaluation of wear and corrosion properties of AA6061/TiB2 composites produced by FSP technique
    DS Rao, N Ramanaiah
    J. Miner. Mater. Charact. Eng 5, 353-361 , 2017
    2017
    Citations: 31
  • Mechanical and microstructural behaviour of aluminium/TiB2 composites fabricated through multi pass friction stir processing
    DSR al.
    11th conference on materials processing and characterization-2020(ICMPC 2020 … , 2020
    2020
    Citations: 27
  • Evaluation of mechanical properties of aluminium alloy (AA 6082) reinforced with rice husk ash (RHA) and boron carbide (B4C) hybrid metal matrix composites using stir casting …
    MP Chakravarthy, DS Rao
    Materials Today: Proceedings 66, 580-586 , 2022
    2022
    Citations: 16
  • Improvements in mechanical properties of aluminium alloy –titanium diboride and boron carbide hybrid composite produced through friction stir processing route
    DSR al
    Materials Today : Proceedings 46 (7), 5231-5236 , 2021
    2021
    Citations: 16
  • CFD analysis to predict heat transfer performance of Louver fin radiator with water/EG and AL2O3 nanofluid
    D Srinivasu, D Santharao, A Ramakrishna
    Int J Sci Eng Adv Technol 4 (2), 159-164 , 2016
    2016
    Citations: 13
  • Computation of structural parameters developed by shot peening and their influence on residual stress and wear properties of AA2017 alloy
    JVSRD et
    Journal of Alloys and Compounds 1036, 1816050 , 2025
    2025
    Citations: 12
  • Optimization of compression ignition diesel engine combustion, emission, and performance characteristics at higher blends of biodiesel using RSM
    A Babji, G Rambabu, BN Dhanavath, LP Cheworei, DS Rao
    Process Integration and Optimization for Sustainability 8 (3), 953-973 , 2024
    2024
    Citations: 7
  • Mechanical and water absorption properties of polymer composites reinforced with animal bone powder
    SR Dakarapu, SR Karri, LSP Ampolu
    Journal of Physics: Conference Series 2604 (1), 012004 , 2023
    2023
    Citations: 6
  • Evaluation of mechanical and micro structural properties of natural fiber reinforced polymer composites
    RD Santha, MO Gopala Krishna
    Materials Science Forum 1065, 69-77 , 2022
    2022
    Citations: 6
  • Parametric optimization of AA6061-Cu friction stir welded joints with boron carbide particle reinforcement
    SR Dakarapu, SR Karri, SK Neelakantam
    Materials and Manufacturing Processes 39 (5), 589-596 , 2024
    2024
    Citations: 4
  • Effect of nano cutting fluid & process parameters on material removal rate and surface finish of SS304 alloy on turning operation
    JE Manikanta, B Srinivas, D Santha Rao
    Int J Emerg Technol Eng Res 5 (12), 71-80 , 2017
    2017
    Citations: 4
  • sustainable machining strategies for metal matrix composites :a comprehensive review
    RRM Eswer manikanta Javvadi , Santosh S, Nitin Ambhore,D.Santha Rao
    Engineering Research Express 7, 1-20 , 2025
    2025
    Citations: 3
  • Optimization of process parameters for improvement of joint strength of dissimilar aluminum alloys by friction stir welding with an activated flux of titanium diboride
    SR Dakarapu, SR Karri, AK Shaik, PC Maddili, ND Chinta
    International Journal on Interactive Design and Manufacturing (IJIDeM) 18 (8 … , 2024
    2024
    Citations: 3
  • Optimization of Laser Beam Welding Parameters for 90/10 Cupronickel Alloy Welds Using Taguchi Method
    PC Maddili, SR Dakarapu
    Strojnícky časopis-Journal of Mechanical Engineering 72 (1), 89-98 , 2022
    2022
    Citations: 3
  • Effect of nanoparticle on mechanical properties of activated tungsten gas welding of austenite stainless steel 316L and optimization of process parameters
    SR Dakarapu, PC Maddili, KM Revu
    International Journal of Materials Research 114 (4-5), 266-275 , 2023
    2023
    Citations: 2
  • Stress Analysis of Gas Turbine Wheel
    MK Naidu, D SanthaRao, J KanthaRao
    International Journal of Engineering Research & Technology (IJERT) 2 (2 … , 2013
    2013
    Citations: 2
  • Analysis and optimization of low-cost compression molding process for manufacture of particulate bone powder PLA composites
    SR Dakarapu, PC Maddili, JE Manikanta, N Ambhore, A Szántó, TI Erdei
    Discover Materials 6 (1), 46 , 2026
    2026
    Citations: 1
  • Characteristics of Butt Joint Produced by Friction Stir Welding Process
    D Santharao, NK Singh, R Kumar
    VOLUME , 2020
    2020
    Citations: 1
  • Investigation of vegetable-based hybrid nanofluids on machining performance in MQL turning
    DSR Manikanta J.E., Ambhore N., Shamkuwar S., Gurajala N.K.
    Obrabotka metallov - Metal Working and Material Science 26 (4), 6-18 , 2024
    2024