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Effect of shot peening on fatigue limit of surface flawed samples
Author(s) -
TAKAHASHI F.,
TANGE A.,
ANDO K.
Publication year - 2008
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.1460-2695.2008.01219.x
Subject(s) - peening , shot peening , fatigue limit , materials science , shot (pellet) , composite material , fatigue testing , metallurgy , residual stress
The effects of shot peening on the fatigue limit of specimens having a semicircular notch of varied surface length, 2a , are investigated. In the case of un‐peened specimens, the fatigue limit of specimens having a notch of a = 0.05 mm was equal to that of the un‐notched specimens. However, the fatigue limit of a = 0.3 mm was 46% smaller than that of the un‐notched specimens. On the contrary, in the case of peened specimens, the fatigue limit of a = 0.2 mm was equal to that of the un‐notched specimens and furthermore, that of a = 0.3 mm was only 5% smaller than that of the un‐notched specimens. Multiple non‐propagating cracks were observed in peened specimens after fatigue testing. The stress intensity factor of the maximum non‐propagating crack size corresponded to that of a = 0.2 mm notch. These results indicate that shot peening increases fatigue limit and decreases the likelihood that a surface flaw will result in failure.