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THE EFFECTS OF MEAN STRESS AND STRESS CONCENTRATION ON FATIGUE UNDER COMBINED BENDING AND TWISTING
Author(s) -
McDiarmid D. L.
Publication year - 1985
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.1460-2695.1985.tb00415.x
Subject(s) - materials science , amplitude , shear stress , torsion (gastropod) , stress (linguistics) , stress intensity factor , bending , structural engineering , plane (geometry) , composite material , shear (geology) , stress concentration , mathematics , geometry , physics , fracture mechanics , optics , engineering , linguistics , philosophy , surgery , medicine
The Gough test data on fatigue under combined bending and twisting with superimposed mean bending and torsion stresses with and without stress raisers has been re‐investigated in terms of the stresses acting on the plane of maximum range of shear stress. It has been shown that the allowable amplitude of shear stress on this plane can be predicted from an equation of the form τ a = [t ‐ c 1 (K t ×σ a ) 1.5 −c 2 σ 2 m ]/K t where σ a and σ m are the normal stress amplitude and mean normal stress respectively on the plane of maximum range of shear stress, c 1 and c 2 are defined material constants and K t is the theoretical stress concentration factor.