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A multiaxial fatigue criterion for random loading
Author(s) -
CARPINTERI ANDREA,
SPAGNOLI ANDREA,
VANTADORI SABRINA
Publication year - 2003
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 - 10.1046/j.1460-2695.2003.00620.x
Subject(s) - structural engineering , amplitude , torsion (gastropod) , vibration fatigue , perpendicular , shear stress , scalar (mathematics) , principal stress , cycle count , nonlinear system , mathematics , materials science , mathematical analysis , fatigue testing , physics , engineering , geometry , composite material , medicine , surgery , quantum mechanics , operations research
A multiaxial fatigue criterion for random loading is proposed. Firstly, the orientation of the critical plane, where fatigue life estimation is carried out, is determined from the weighted mean position of the principal stress directions. Then, the scalar value of the normal stress vector N ( t ) perpendicular to the critical plane is taken as the cycle counting variable since the direction of such a vector is fixed with respect to time (conversely to the time‐varying direction of the shear stress vector C ( t )), and a nonlinear combination of normal and shear stress components acting on the critical plane is used to define an equivalent stress amplitude. Finally, a damage accumulation model is employed to process such an equivalent stress amplitude and to determine fatigue endurance. This criterion is herein applied to some relevant random fatigue tests (proportional bending and torsion).