Estimation of contact stresses in EN31 rolling contact bearings for screw compressor using Gauss quadrature & statistical analysis

ABSTRACT

The aim of this work is to estimate Hertzian contact stresses in EN31 alloy steel and to obtain the line of best fit using statistical analysis. In refrigerant screw compressors, EN31 is used as a material of construction for cylindrical roller bearings. The Hertzian contact with friction between the outer surface of the inner race of the rolling contact bearing & the outer surface of the cylindrical roller is simulated using pin-on-disk tribometer. Measurement of friction coefficient was carried out by sliding different cylinders of hardened EN31 material against the hardened EN31 disk of the pin-on-disk tribometer. A total 16 tests, each of 1 minute time duration, are performed for the estimation of friction coefficient with varying loads from 20 N to 100 N and speeds in the range of 50 RPM to 200 RPM. The magnitude of Von Mises stress induced in the inner race of the bearing is estimated using Gauss quadrature method with the help of a self-developed MS Excel program. Statistical analysis showed that the stress magnitude increases with the increase in the load & decreases with an increase in speed.

KEYWORDS:

• Screw compressor
• Hertzian contact stresses
• Von Mises stresses
• Gauss quadrature method
• pin-on-disk tribometer
• friction coefficient
• statistical analysis
• MINITAB

Disclosure statement

No potential conflict of interest was reported by the authors.

Data Availability Statement

Data sharing not applicable to this article as no datasets were generated or analysed during the current study.

Financial andEthical disclosures

This work is not supported fully or partially by any funding organisation or agency.

Additional information

Notes on contributors

S. H. Gawande

S. H. Gawande completed Bachelor’s degree in Mechanical Engineering from Amravati University, Amravati in 2001 & Master’s degree in Mechanical Engineering with Design Engineering as specialization in 2002 from University of Pune. He completed PhD in Mechanical Engineering from Government College of Engineering, Pune, (COEP) under University of Pune in 2012. He successfully guided 4 PhD scholars in mechanical engineering under S.P. Pune University, Pune and currently guiding 5 PhD scholars in mechanical engineering. Now he is working in mechanical engineering at Industrial Tribology Laboratory. M. E. S. College of Engineering Pune-411001, India from 2004. His area of interest is internal combustion engines, design engineering, tribology and vibration control. He is permanent member of Indian society ISTE from 2005, IACSIT Singapore from 2009 and SAE from 2008.

K. Balashowry

K. Balashowry currently working as Professor in the department of Mechanical Engineering at VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad. He is having 28 years of teaching experience and 15 years of research experience in the area of computation fluid dynamics. He worked as a principal at SRKIT Vijayawada and also at DRKIST Hyderabad. He has completed PhD in the area of thermal Engineering from Jawaharlal Nehru Technological University, College of Engineering. He published nearly 25 papers in national and international journals. He is life member of MISTE and combustion (LMC). He is also member of IAENG, IRED. His area of interest is diesel engines, computational fluid dynamics, tribology and machining.

K. A. Raykar

K. A. Raykar completed Bachelor’s degree in mechanical engineering from Mumbai University, Mumbai. He completed master’s degree in mechanical engineering with design engineering as specialization in 2021 from Savitribai Phule Pune University, Pune. His area of interest is design engineering, material science and tribology.

K. H. Munde

K. H. Munde completed Bachelor’s degree in Mechanical Engineering from Shivaji University, Kolhapur in 2002 & Master’s degree in Mechanical Engineering with Design Engineering as specialization in 2005 from Shivaji University. He completed PhD in Mechanical Engineering from Sant Gadge Baba Amravati University, Amravati in 2018. He successfully guided 2 PhD scholars in mechanical engineering and currently guiding 2 PhD scholars in mechanical engineering. Now he is working in Mechanical Engineering Department of A.B.M.S.P Anantrao Pawar College of Engineering and Research Pune-411009, India from 2015. His area of interest is Machines and Mechanism, design engineering, tribology and vibration control. He is permanent member of Indian society ISTE from 2005, IAAC from 2022 and CIIR from 2007.