Dr. Rupendra S. Nehete

Dr. Pradip P. Patil

Tushar Jangam

Poojari J Krishna

Mistry Raj Shailesh

Rajkumar Raphel

Abstract

Shock absorber spring is important component in fiat bogie of coach of Indian railways. Nested springs are used in double suspension system of fiat bogie. The most common problem of the failure of suspension system is the failure of springs during service. When a spring fails in a suspension system in a Fiat Bogie there are a number of mishaps which can happen like accidents, discomfort, loss of life these are some of the extreme happenings. The frequent failure of spring also results in valuable man hour wastage in maintenance and replacement of it. In this paper the causes responsible for the spring is studied and the failure analysis of it is presented. The study reveals major reasons of the failure of spring- failure due to reduction in the permissible free height, fretting, stress corrosion and rubbing marks. The study is carried out in the period of March 2019 and total 144 defects were reported. The paper also presents the metallurgical analysis of the bogie spring.

Keywords- fiat bogie, spring, failure analysis