Computerised Correlation of Results of Shot Peening Tests.

Author:  Lavit Rawtani
Source:  Conf: (Bophal) Intl Conf on Shot Peening and Blast Cleaning (Book:Sharma/Ra
Doc ID:  1996031
Year of Publication:  1996
Abstract:  
The major cause of failure of machine components subjected to alternating stresses and vibration, is fatigue. The fatigue life is known to improve significantly by shot peening, the experiments for which consist of two stages. In the first stage a large number of components or test pieces are subjected to different levels of shot peening. The second stage consists of performing fatigue tests on shot peened specimens. A large volume of data is generated in the form of tables, giving the fatigue life values for corresponding shot size, velocity of shots, duration of shot peening etc. Since the number of parameters in shot peening and fatigue response can be large, there is a need to condense the large volume of test data. In the present paper this is achieved by using multiple linear regression analysis. A computer programme is developed which can give a mathematical relationship between fatigue life and the various parameters such as shot size, shot speed, time duration of shot peening etc. The experimental results reported by Sanderson and Slingsby for fatigue tests conducted on shot peened helical coil springs are used as example for illustration.