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- Title
Multiaxial notch fatigue life prediction based on the dominated loading control mode under variable amplitude loading.
- Authors
Tao, Zhi‐Qiang; Zhang, Ming; Zhu, Yu; Cai, Tian; Zhang, Zi‐Ling; Liu, Hu; Bai, Bin; Li, Dao‐Hang
- Abstract
A new calculation approach is suggested to the fatigue life evaluation of notched specimens under multiaxial variable amplitude loading. Within this suggested approach, if the computed uniaxial fatigue damage by the pure torsional loading path is larger than that by the axial tension–compression loading path, a shear strain‐based multiaxial fatigue damage parameter is assigned to calculate multiaxial fatigue damage; otherwise, an axial strain‐based multiaxial fatigue damage parameter is assigned to calculate multiaxial fatigue damage. Furthermore, the presented method employs shear strain‐based and axial strain‐based multiaxial fatigue damage parameters in substitution of equivalent strain amplitude to consider the influence of nonproportional additional hardening. The experimental data of GH4169 superalloy and 7050‐T7451 aluminium alloy notched components are used to illustrate the presented multiaxial fatigue lifetime estimation approach for notched components, and the results reveal that estimations are accurate.
- Subjects
STRAINS &; stresses (Mechanics); SHEAR strain; TORSIONAL load; FORECASTING; ALUMINUM alloys; COMPRESSION loads; FATIGUE life; MATERIAL fatigue
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2021, Vol 44, Issue 1, p225
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13357