In‐plane biaxial ratcheting effect and low‐cycle fatigue behavior of CP‐Ti based on DIC method

In‐plane biaxial fatigue tests of commercial pure titanium (CP‐Ti) were performed to investigate the effects of load ratio and phase shift on fatigue and ratcheting behavior. The results show that with the decrease of load ratio or the increase of phase shift, biaxial ratcheting strain effect is mor...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2022-05, Vol.45 (5), p.1464-1479
Main Authors: Zhao, Jia‐Yu, Lu, Zheng, Zhou, Chang‐Yu, Chang, Le, He, Xiao‐Hua
Format: Article
Language:English
Subjects:
CP‐Ti
Crack propagation
Fatigue life
Fatigue strength
Fatigue tests
in‐plane biaxial fatigue
Life prediction
load ratio
Morphology
Phase shift
Prediction models
Ratcheting
Titanium
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Summary:In‐plane biaxial fatigue tests of commercial pure titanium (CP‐Ti) were performed to investigate the effects of load ratio and phase shift on fatigue and ratcheting behavior. The results show that with the decrease of load ratio or the increase of phase shift, biaxial ratcheting strain effect is more significant, leading to the deterioration of fatigue resistance. Analysis of the crack morphology and fracture characteristic reveals that the crack propagation path becomes complex and the fracture morphology changes due to the enhanced non‐proportional hardening effect. Finally, current multiaxial life prediction models are evaluated to compare the applicability in the biaxial fatigue life prediction. Highlights Effects of load ratio and phase shift on biaxial ratcheting behavior are discussed. Biaxial fatigue life is more sensitive to the variation of the phase shift. The crack morphology and fracture characteristics are analyzed. The applicability of different multiaxial life prediction models is evaluated.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13675