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AN ANALYSIS OF STRESS CONCENTRATIONS CAUSED BY SHOT PEENING AND ITS APPLICATION IN PREDICTING FATIGUE STRENGTH
Author(s) -
Li J. K.,
Mei Yao,
Duo Wang,
Renzhi Wang
Publication year - 1992
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 - 10.1111/j.1460-2695.1992.tb01262.x
Subject(s) - peening , shot peening , residual stress , fatigue limit , structural engineering , stress (linguistics) , materials science , finite element method , stress concentration , stress field , shot (pellet) , metallurgy , engineering , linguistics , philosophy
— In order to calculate the stress concentration caused by shot‐peening dents, three simplified models, namely a one‐pit model, a seven‐pit model and a pit‐loop model, are proposed in this paper. By using a finite element program for automatic dynamic incremental non‐linear analysis, the stress concentration coefficients based on these models are calculated for different pit parameters and different stress fields. When considering the stress concentration and residual stress field produced by shot peening, a modified Goodman formula is proposed and used for forecasting the fatigue strength of peened specimens having the fatigue sources at the surface. The forecasted results were verified by peening followed by fatigue tests on 40Cr steel.