Reintroduction of Residual Stress by Shot Peening

Author:  P.Parmeswaran, S.V. Mate and M.S. Nadgir
Source:  Conf Proc: ICSP & BC - 2
Doc ID:  2001173
Year of Publication:  2001
Abstract:  
Hindustan Aeronautics Ltd., Aircraft Division, Nasik has been engaged in the manufacture and overhaul of Russian origin fighter aircraft for the last 35 years. As of this date the division has manufactured and overhauled over 1700 aircraft. The division deals with advanced aircraft materials and has precision machining, heat treatment and plating facilities and extensive facilities for non-destructive testing. The division is also one of the few centers in India which manufactures and overhauls aircraft and helicopter landing gears. The critical components of aircraft are; load-carrying Bulkheads, Undercarriage, Wing spars, Control surfaces, Engine and Ejection system which requires advanced technology and precision tools for their manufacture. The initial life prescribed by the manufacture for aircraft and landing gears are conservative due to uncertainties in the design analysis and life cycle testing at Certification stage. Mid life extension is therefore given through a very cautious and sound engineering judgement based on stress analysis, NDT and feedback received from operators.