Premium
Cyclic modelling of the mechanical state produced by shot‐peening
Author(s) -
Lillamand I.,
Barrallier L.,
Lalanne B.,
Castex L.
Publication year - 2001
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.2001.00348.x
Subject(s) - shot peening , peening , residual stress , materials science , gas compressor , structural engineering , shot (pellet) , hardening (computing) , low cycle fatigue , service life , titanium alloy , metallurgy , engineering , mechanical engineering , alloy , composite material , layer (electronics)
During low cycle fatigue of shot‐peened parts, the competition between the compressive residual stresses and the hardening damage, both of which are produced by cumulated plastic strains, is of major importance for lifetime improvement. In order to take into account these effects in life prediction, the shot‐peening treatment must be considered as a first step in the service life of the studied part. The predicted residual stresses provided by the existing shot‐peening models are not sufficient when taking account of the induced mechanical state. The proposed methodology in this paper describes the shot‐peening process by a new cyclic approach where the Chaboche constitutive equations, commonly used in the aircraft industry, show the best promise. A reversed method is employed to quantify, after shot‐peening, the complete mechanical state in line with commonly used life‐prediction algorithms. Computations are carried out for a shot‐peened TiAl6V4 titanium alloy as used in the low pressure stage compressor of turbo‐engine discs.