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Influence of shot peening on fatigue durability of normalized steel subjected to variable amplitude loading

Kamellia Dalaei (Institutionen för material- och tillverkningsteknik, Materialteknologi) ; Birger Karlsson (Institutionen för material- och tillverkningsteknik, Materialteknologi)
International journal of fatigue (0142-1123). Vol. 38 (2012), May 2012, p. 75-83.
[Artikel, refereegranskad vetenskaplig]

The influence of shot peening on the fatigue durability of normalized carbon steels subjected to variable amplitude loading has been investigated. The relaxation of residual stresses was recorded during the fatigue life time. Strain amplitude spectra were extracted from real spectra recorded from components in service. The results were compared with data achieved from constant amplitude testing. In both types of tests parallel studies were made on both peened and unpeened specimens. Shot peening leads to pronounced increase in life time, especially for smaller amplitudes. For both variable and constant amplitude loading shot peened specimens exhibit longer life provided the residual stresses during fatigue loading do not relax more than to about 60% of their initial value. To get an improvement in life time of at least a factor two for peened specimens, the stress amplitude in constant amplitude loading or the maximum stress amplitude in variable amplitude history must not be more than 20% larger than the magnitude of the initial residual stresses. This limit corresponds to 1.2 times the yield strength of the unaffected material.

Nyckelord: Variable amplitude fatigue; Shot peening; Residual stresses relaxation; Normalized steel



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Denna post skapades 2012-01-12. Senast ändrad 2016-11-02.
CPL Pubid: 152644

 

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