The Saturation Point in accordance to the current SAE J443 - No problem for former processes?

Author:  J.P. Fuhr, R. Fiebach, N. Stöcklein
Source:  Conf Proc 2014: ICSP-12 Goslar, Germany (pgs.410-415)
Doc ID:  2014112
Year of Publication:  2014
Abstract:  
The Almen strip and the herewith connected creation of a saturation curve is an important measuring method for defined and reproducible results within the controlled shot peening process of metal parts. Since 1952 when the first J443 "Procedures for Using Standard Shot Peening Almen Strip" [1] was issued the specification was several times adjusted till in June 2010 the current version [2] was issued. In this newest version the first time the Peening Intensity is a unique single point on a Computer Generated Shot Peening Saturation Curve following the SAE 2597 [3]. In all former specifications this definition was not exactly given or at least ambiguous. The present paper will first highlight the major changes in finding the Shot Peening Intensity in accordance to the former and latest version of the SAE-J443. In a further step it will demonstrate that by using the "former" and "new" the location of the saturation point on the saturation curve can be influenced an therefore eventually different parameters for the "same" Intensity could be used.