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Uniaxial ratcheting behavior and fatigue life models of commercial pure titanium
Author(s) -
Chang Le,
Wen JianBin,
Zhou ChangYu,
Zhou BinBin,
Li Jian
Publication year - 2018
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.12839
Subject(s) - materials science , stress (linguistics) , exponential function , composite material , amplitude , structural engineering , fatigue limit , cyclic stress , mathematics , engineering , mathematical analysis , physics , philosophy , linguistics , quantum mechanics
The uniaxial fatigue and ratcheting behavior of commercial pure titanium (CP‐Ti) was investigated by asymmetric cyclic stress‐controlled experiments at room temperature. The effects of mean stress, stress amplitude, stress ratio, and peak stress on ratcheting behavior and fatigue life were discussed. It was found that increasing mean stress, stress amplitude, and peak stress or decreasing stress ratio reduced fatigue life and promoted ratcheting behavior. The applicability of different fatigue life models was analyzed, and a new stress ratio‐related failure model was proposed based on the exponential increase of fatigue life with stress ratio. Among all the models investigated in this study, the exponential stress ratio‐related model has more advantage in fatigue life predictions for CP‐Ti under ratcheting‐fatigue interaction.