Prediction of Fatigue Life of Gear Subjected to Varying Loads

D. Hanumanna; S. Narayanan; S. Krishnamurthy

doi:10.14429/dsj.48.3948

D. Hanumanna Combat Vehicles Research & Development Establishment, Chennai
S. Narayanan Indian Institute of Technology Madras, Chennai
S. Krishnamurthy Indian Institute of Technology Madras, Chennai

DOI: https://doi.org/10.14429/dsj.48.3948

Keywords: Traverse gear box, Load spectrum, Gaussain distribution, Cumulative frequency distribution

Abstract

Structural members and components of a vehicle during service are subjected to varying loads which are random in nature. For structural members subjected to loads of constant amplitude, it is possible to describe the load with explicit mathematical relationship, and thereby, the life span can be estimated. Whereas, for structural members subjected to varying loads with time, there is no satisfactory method to estimate their life span. This paper describes a method for the estimation of life span of a gear in the gear box of a fighting vehicle subjected to fluctuating loads. For this purpose, it is assumed that the load spectrum corresponds to Gaussian (normal) distribution, and the life has been worked out by applying linear cumulative damage theory.

Author Biographies

D. Hanumanna, Combat Vehicles Research & Development Establishment, Chennai

Mr D Hanumanna obtained his BE (Mech.) from Sri Venkateswara University and MTech in Design of Machine Tools from Regional Engineering College, Warangal. Presently, he is working as Additional Director at the Combat Vehicles Research & Development Establishment. Avadi. He has been involved in inspection, integration, design and development of armoured fighting vehicles for Indian Army for more than two decades. Currently he is the incharg.e of the main battle tank- Arjun programme. His areas of research are hydraulic controls and fatigue failure of components under random loading.

S. Narayanan, Indian Institute of Technology Madras, Chennai

Dr s Narayanan obtained his BE (Mech.) from University of Chennai, in 1967 and PhD (Aeronautical) from Indian Institute of Technology (lIT), Kanpur, in 1975. He had been teaching at lIT, Chennai and lIT, Kanpur since 1973. Presently, he is working as Professor at IIT, Chennai in
the areas of vibration, random vibration, nonlinear vibration, acoustics and noise control. He has published about 70 papers in national international journals and conferences: He is Fellow of the Indian National Academy of Engineering, the Aeronautical Society of India, and Alexander Van Hurbolit post doctoral Fellow at the Technical University, Berlin. He is also coauthor of book on Applications of Random Vibration.

S. Krishnamurthy, Indian Institute of Technology Madras, Chennai

Dr S. Krishnamurthy obtained his MS (Mech.) from Jawaharlal Nehru Technological University, Hyderabad and PhD from Indian Institute of Technology (lIT), Chennai. He is currently Associate Professor at IIT, Chennai. He has been teaching since 1968. His areas of research include surface durability and failure analysis of gears. He is a member of the Institution of Engineers (India); Fluid Power Society of India and Treasurer of Association for Machines and Mechanisms.