Background

Dr. Prajapati is currently working as IPDF (Institute Postdoc Fellow) the Department of Mechanical Engineering, IIT Madras, India. He received his Ph.D. in Mechanical Engineering form IIT Patna in the Year-2019. He worked as a IPDF in the Department of Mechanical Engineering, IIT Delhi from December 2020 to December 2021. His area of specialization is tribology, surface texturing, and machine learning. Prior to joining IIT Patna, he completed his masters (M.Tech.) in Applied Mechanics specialization from MNNIT Allahabad in the Year-2014. He completed his bachelor degree (B.Tech.) in Mechanical Engineering specialization from K.I.E.T Ghaziabad, affiliated to UPTU Lucknow, U.P. in the Year-2011. His Ph.D. research work was focused on the numerical and experimental analysis of gears and rolling elements bearings. To date, he published more than Ten (20) peer-reviewed papers in prestigious journals like, Wear, Transactions of ASME-Journal of Tribology, Journal of Engineering Tribology, Fatigue & Fracture of Engineering Materials & Structures (FFEMS), Friction-Springer, and many more. He also served as a Reviewer for many prestigious journals like, Measurements, Transactions of ASME, etc. Currently, his current area of research is application of deep learning algorithms for analysis of gearbox rolling bearings.

Ph.D. (CGPI- 7.5)

Thesis Title

Evolution of Surface Topography Parameters for Tribological Components Under Rolling and Sliding Motion

Thesis Supervisor

Dr. Mayank Tiwari, Professor, Dept. of Mech. Engg., IIT, Patna, Bihar, India

M.Tech (CGPI-8.30)

Thesis Title

A Numerical Study on Buckling, Post-Buckling, Bending, and Free Vibration Analysis of Laminated and Composite Plates.

Thesis Supervisor

Dr. K. K. Shukla, Professor, Dept. of App. Mech.,MNNIT, Allahabad, U.P., India

B.Tech. (Marks- 68.27)

Thesis Title

Synthesis of Ground Source Water Cooling System

Thesis Supervisor

Er. Sachin Rathore, Associate Professor, Dept. of Mech. Engg., K.I.E.T, Ghaziabad, U.P., India

Research Papers (published/submitted) Detail

Peer-Reviewed SCI Publications

Year 2022

• Prajapati, D., K., Ramkumar, P., 2022, “Prediction of friction coefficient for WLJB considering non-Gaussian roughness and cavitation effects,” ILT, (in review).

• Prajapati, D., K., Ramkumar, P., 2022, “Machine learning approach for prediction of performance parameters in mixed-EHL concentrated elliptic contacts,” Part C: Journal of Mechanical Engineering Science, (submitted).

• Prajapati, D., K., Ramkumar, P., 2022, “A numerical model for surface topography design of rolling element bearing considering non-Newtonian rheology of lubricant,” Part J: J. Eng. Tribol., (in review).

• Prajapati, D., K., Ramkumar, P., 2022, "Surface topography effect on tribological performance of water-lubricated journal bearing under mixed-EHL regime ," STMP, 10(4), 045022 .

• Prajapati, D., K., Ramkumar, P., Katiyar, J., 2022, “Research on tribological performance of piston ring/liner conjunction considering non-Gaussian roughness and cavitation,” Part J: J. Eng. Tribol., 0, 1-14 .

Year 2021

• Prajaapti, D., K., 2021, "Numerical Analysis of Rough Hydrodynamic Bearings for Various Deterministic Micro-Asperity Features ," STMP, 9(1),015004 .

• Prajapati, D., K., 2021, “Prediction of Coefficient of Friction for Different Surface Topography in Mixed-Elastohydrodynamic Lubrication,”STMP, 9(1),015008 .

Year 2020

• Prajapati, D., K., and Ahmed, S., 2020, “Multi-Scale Approach for Analyzing the Surface Topography of Micro Friction Stir Welded Joints,” STMP, 8(3), 035011.

• Prajapati, D., K., and Tiwari, M., 2020, “Experimental Investigation on Evolution of Surface Damage and Topography Parameters during Rolling Contact Fatigue Tests,” FFEMS, 43 (2), 355-370.

• Prajapati, D., K., and Tiwari, M., 2020, “Experimental Analysis of Contact Fatigue Damage Using Fractal Methodologies,” Wear, 203262.

Year 2019

• Prajapati, D., K., and Tiwari, M., 2019, “Effect of Correlation Length, Surface Roughness, and Load on Friction Coefficient Under Mixed Lubrication Regime,” Lub. Sci., 31 (5), 218-228.

• Prajapati, D., K., Singh, K., and Tiwari, M., 2019, “Tribological Investigation of Copper and AISI 304 Steel during Dry Sliding Wear,” Surf. Topogr.: Metrol. Prop., 7, 015021.

• Prajapati, D., K., and Tiwari, M., 2019, “Assessment of Topography Parameters during Running-in and Subsequent Rolling Contact Fatigue Tests,” ASME J. Tribol., 141, 051401.

• Prajapati, D., K., and Tiwari, M., 2019, “Investigation on Metallic Contact Conditions Using ECR Technique by Performing Rolling/Sliding Experiments,” Surf. Topogr.: Metrol. Prop., 7, 015015.

• Prajapati, D., K., and Tiwari, M., 2019, “The Correlation between Friction Coefficient and Areal Topography: An Experimental Study,” Friction, 9(1), 41-60.

Year 2018

• Prajapati, D., K., and Tiwari, M., 2018, “3D Numerical Wear Model for Determining the Change in Surface Topography,” Surf. Topogr.: Metrol. Prop., 6, 045006.

• Prajapati, D., K., and Tiwari, M., 2018, “The Relation between Fractal Signature and Topography Parameters: A Numerical and Experimental Study,” Surf. Topogr.: Metrol. Prop., 6, 045008.

Year 2017

• Prajapati, D., K., and Tiwari, M., 2017, “Topography Analysis of Random Anisotropic Gaussian Rough Surfaces,” ASME J. Tribol., 139, 041402.

Scopus Index Publications

• Prajapati, D., K., and Tiwari, M., 2017, “Use of Artificial Neural Network (ANN) to Determine Surface parameters, Friction and Wear during Pin-on-Disc Tribotesting ,” Key Eng. Mat., 739, 87-95.

• Prajapati, D., K., and Tiwari, M., 2018, “2D Numerical Wear Model for Determining Change in Surface Topography with Number of Wear Cycles,” Proceedings of Asia International Conference on Tribology-2018, 2018, 233-234.

• Prajapati, D., K., 2021, “Change in Surface Topography of Real Surfaces during Wear ,” Key Eng. Mat., 901, 199-207.

Book/ Book chapters

• Prajapati, D., K., and Tiwari, M., 2020, "Evolution of Surface Topography During Wear Process ," Tribology and Materials Application, Springer-Cham, 179-188.

List of Conferences

• Prajapati, D., K., 2020, “Importance of surface topography for analysing friction and wear” The 3rd Malaysian International Tribology Conference (MITC-2020), 28-30 September-2020, Langwaki, Malaysia (abstract accepted)

• Prajapati, D., K., and Tiwari, M., 2019, “Effect of correlation length and surface roughness on topography parameters during running-in wear” 7^th European Conference on Tribology (ECOTRIB-2019), 12^th June 2019 to 14^th June 2019, Wein, Austria

• Prajapati, D., K., and Tiwari, M. 2018, “2D numerical wear model for determining change in surface topography with number of cycles”, The 6^th Asia International Conference on Tribology, 17-20 September 2018, Kuching, Malaysia

• Prajapati, D., K., and Tiwari, M., 2017, “Effect of surface topography parameters on friction coefficient and load distribution in rolling/sliding point contacts operating under mixed lubrication regime using load- sharing concept,” 6^th European Conference On Tribology (ECOTRIB-2017), 7-9 June 2017, Ljubljana, Slovenia

• Prajapati, D., K., and Tiwari, M., 2017, “Effect of texture pattern on change in topography of AISI 1020 steel when sliding against AISI 8620 steel,” World tribology Congress (WTC), 17-22 September 2017, Beijing, China

• Prajapati, D., K., and Tiwari, M., 2016, “Use of artificial neural network to determine surface parameters, friction and wear during pin-on-disc tribotesting,” International Conference on Engineering Tribology and Applied Technology (ICETAT), 4-6 November 2016, Taipei, Taiwan

• Prajapati, D., K., and Tiwari, M., 2017, “Study on fractal dimension of rough surfaces,” 9^th International Conference on Industrial Tribology (ICIT), 6-9 December 2017, Kolkata, India

• Prajapati, D., K., and Tiwari, M., 2016, “Comparison of wear parameters for aluminium and steel materials during pin-on-disc tribotesting,” National Tribology Conference (NTC), 8-10 December 2016, IIT Varanasi, India

• Prajapati, D., K., and Tiwari, M., 2016, “Numerical modeling of 3D random Gaussian rough surfaces,” National Tribology Conference (NTC), 8-10 December 2016, IIT Varanasi, India

• Prajapati D., K., and Tiwari, M., 2015, “Micro-pitting in various manufacturing process,” In Proceedings of National Conference on Product Design and Manufacturing (NCPDM 2015), 21-22 November, 2015, MNNIT Allahabad, India

Reviewer of Peer-Reviewed Journals

• Journal of Tribology -AMSE (1)

• Friction-Springer (1)

• Tribology Letters- Springer (1)

• Journal of Engineering Tribology -ImechE Part J (1)

• Measurement-Elsevier (2)

• Journal of European Physics -IOP Publishing (1)

• Mathematical Problems in Engineering- Hindwai (1)

• Surface Topography: Metrology and Properties- IOP Publishing (2)

• Material Research Express -IOP Publishing (1)

Industry Experience

Served as a Graduate Engineer Trainee (GET) in Quality Assurance (QA) Department at Bhushan Steel Ltd., Khopoli, Raigad, Maharashtra, from Aug. 2011-June 2012.

Research Experience

• Feb- 2022 - till date

Institute Post-Doctorate Fellow (IPDF) in the Department of Mechanical Engineering, IIT Madras, India (Supervisor- Dr P. Ramkumar)

• Dec.- 2020 to Dec. -2021

Institute Post-Doctorate Fellow (IPDF) in the Department of Mechanical Engineering, IIT Delhi, India (Supervisor- Prof. S. K. Sinha & Prof. R K Pandey)

• May- 2020 - August 2020

Worked as a Project Associate (PA) in the Department of Mechanical Engineering, IIT Delhi, India (Supervisor- Prof. R. K. Pandey)

• November 2019 - March-2020

Worked as a Research Associate (RA) under supervision of Dr. Mayank Tiwari, Associate Professor, Department of Mechanical Engineering, IIT Patna, India

• July 2014-November 2019

PhD Research Scholar, Department of Mechanical Engineering, IIT Patna, India, Supervisor: Dr. Mayank Tiwari

Award and Achievements

• Won cash prize of 5000 INR for Best Poster Presentation in National Tribology Conference (NTC-2016) organized by IIT (BHU), Varanasi during 8-10 December 2016.

• Green belt in ‘Lean Six Sigma’ certified course organized by KPMG.

• Delivered a technical talk on “Surface Topography Variation During Wear” at Ducom Instruments, India, September-2017

• ASME member- Membership No. 102573592

Software's Used

• Octave: A open source software

• Origin 8.0

• Scikit Learn

• Spyder, Jupyter notebook,

• Matlab, Fortran 90,

Skills (Computational)

• Boundary Element Method

• FORTRAN programming

• Python language

• Matlab programming

• Machine learning (supervised and UN-supervised)

Instruments Used so Far..

• Two roller machine (TE 74S Twin disc tribometer), Make: Phoenix tribology ltd., UK

• Multi-fucntional tribometer, Make: Rtec Instruments, USA

• Pin-on-disc tribometer, Make: Ducom Instruemnts, Bangalore, India

• 3D Profilometer, Make: Zygo, USA

• FE-SEM (Gemini 500), Make: Zeiss, Germany