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Stability of Residual stresses Created by Shot Peening of Pearlitic Steel and Their Influence on Fatigue Behaviour

Kamellia Dalaei (Institutionen för material- och tillverkningsteknik) ; Birger Karlsson (Institutionen för material- och tillverkningsteknik, Materialteknologi) ; Lars-Erik Svensson (Institutionen för material- och tillverkningsteknik)
10th International Fatigue Congress, FATIGUE 2010; Prague; Czech Republic; 6 June 2010 through 11 June 2010 (1877-7058). Vol. 2 (2010), 2, p. 613-622.
[Konferensbidrag, refereegranskat]

In this study the effect of shot peening on the fatigue lifetime of a near pearlitic microalloyed steel was investigated. The fatigue tests were run in strain control with parallel recording of stress relaxation and recovery of the work hardened surface zone at different total strain amplitudes exerted to the test specimens. These relaxation processes were followed versus cycle number up to half of the fatigue life time (N=Nf/2). Provided that the global plastic strain amplitude is lower than about 0.08 % a noticeable increase in life time is seen. Lower plastic strain amplitude increases the life time. At small plastic strain amplitudes it was found that the fatigue life time could be increased more than tenfold by the shot peening process.

Nyckelord: Fatigue, Strain control, Residual stress, Relaxation, Work hardening, Micro alloyed steel

Denna post skapades 2010-05-12. Senast ändrad 2016-08-19.
CPL Pubid: 121545


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