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FATIGUE STRENGTH EVALUATION FROM SURFACE YIELDING DATA
Author(s) -
He J.,
Wang H.,
Nan J.
Publication year - 1993
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.1460-2695.1993.tb00104.x
Subject(s) - fatigue limit , materials science , residual stress , surface (topology) , surface roughness , composite material , yield (engineering) , cyclic stress , stress (linguistics) , surface finish , diffraction , fatigue testing , structural engineering , mathematics , geometry , engineering , physics , optics , linguistics , philosophy
Surface yielding was detected by X‐ray diffraction. The surface yield strength s̀ sy was significantly less than the bulk yield strength, and depends on the physical state and roughness of the surface. However s̀ sy does not change with changes in surface residual stress. Determination of surface yielding, measured under static loading, indicates that a remarkable number of grains have been plastically deformed at the s̀ sy stress level, which will result in damage accumulation under cyclic loading. Crack initiation predominates at the level of the fatigue endurance life for smooth parts and experiments indicate that s̀ sy equals the smooth specimen fatigue limit, particularly that associated with a high survival probability.