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MIXED MODE (I + III) FATIGUE THRESHOLDS IN A FORGING STEEL
Author(s) -
Yates J. R.,
Miller K. J.
Publication year - 1989
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.1460-2695.1989.tb00532.x
Subject(s) - materials science , structural engineering , torsion (gastropod) , perpendicular , forging , fatigue testing , principal stress , displacement (psychology) , composite material , engineering , metallurgy , mathematics , shear stress , geometry , medicine , psychology , surgery , psychotherapist
— The results of mixed mode (I + III) fatigue tests on a low pressure steam turbine rotor steel are presented. Tests were performed on a uniaxial servohydraulic fatigue machine fitted with a torsion‐bending loading frame. The onset of failure was marked by fatigue facets which grew perpendicular to the maximum principal stress direction. A criterion for mixed mode (I + III) fatigue thresholds based on the orientation and the crack opening displacement of fatigue cracks is proposed.