Complex-shaped hardened parts fatigue limit prediction according to the witness sample study results

International Conference and Youth Scientific School on "Materials and Technologies of New Generations in Modern Materials Science"

Surgutanova, Yu N.^1 ; Mikushev, N.N.^1 ; Surgutanov, N.A.^1 ; Kiselev, P.E.^1 ; Shlyapnikov, P.A.^1 ; Meshcheryakova, A.A.^1

National Research University of Samara Named after S P Korolyov, University of Samara, Samara City, Russia^1

关键词: Circular notches;    Compressive residual stress;    Fatigue Limit;    Fatigue limit prediction;    Fatigue strength;    Measurements of;    Surface hardening;    Surface plastic deformation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/156/1/012018/pdf
DOI  :  10.1088/1757-899X/156/1/012018

来源: IOP

【 摘 要 】

The aim of this study is to investigate the possibility of assessment of the effect of preparatory surface plastic deformation by hydraulic shot blasting on the fatigue strength of cylindrical parts of different diameters (10-40 mm) of D16T alloy with circular notches of semicircular section, based on measurements of residual stress (initial deformations) of a witness sample. The residual stresses of smooth parts were used to calculate the residual stresses of parts with stress raisers. These were used to predict the increment of these parts fatigue limit caused by hardening hydraulic shot blasting. It was found that the highest compressive residual stresses in the smooth parts obtained through calculations differ from the observed values not more than by 7%, and in notched parts by 8%. Using the criterion of mean integral residual stresses, we calculate the increments of the fatigue limit of parts due to superficial hardening. The discrepancy between the experimental and calculated increment values of the fatigue limit of hardened parts with raisers does not exceed 17%.