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An improved critical plane and cycle counting method to assess damage under variable amplitude multiaxial fatigue loading
Author(s) -
Luo Peng,
Yao Weixing,
Susmel Luca
Publication year - 2020
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/ffe.13281
Subject(s) - amplitude , cycle count , plane (geometry) , structural engineering , variance (accounting) , materials science , stress (linguistics) , variable (mathematics) , mathematics , mathematical analysis , engineering , physics , geometry , optics , linguistics , accounting , operations research , business , philosophy
The plane with the maximum variance of the resolved shear stress is taken as the critical plane. Two algorithms are used along with the maximum variance method (MVM) to determine the orientation of the critical plane. The maximum variance of the normal stress on the potential critical planes is calculated to determine the one experiencing the maximum extent of fatigue damage. A new multiaxial cycle counting method is proposed to count cycles on the critical plane. The modified Wöhler curve method is used to assess fatigue damage. About 200 experimental results were collected from the technical literature to validate the approaches being proposed. The results show that the improved design technique being proposed is successful in assessing fatigue damage under variable amplitude multiaxial cyclic loading.