Fatigue crack growth under mixed mode I-II loading with a single tensile overload at negative load ratios

•Mechanism of overload effect of mixed mode I-II crack growth at negative load ratio is revealed.•Effect of loading angle and loading ratio on crack growth with overload loading is discussed.•Stress–strain field and plastic deformation at crack tip are revealed by finite element method. Fatigue crac...

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Bibliographic Details
Published in:Theoretical and applied fracture mechanics 2022-04, Vol.118, p.103294, Article 103294
Main Authors: Xie, Lin-qi, Zhou, Chang-yu, Zhang, Peng, He, Xiao-hua
Format: Article
Language:English
Subjects:
Compressive load
Compressive properties
Crack closure
Crack propagation
Crack tips
Fatigue crack growth
Fatigue failure
Finite element analysis
Finite element method
Fracture mechanics
Mixed mode I-II crack
Overload
Overloading
Plastic zones
Retardation
Titanium
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Summary:•Mechanism of overload effect of mixed mode I-II crack growth at negative load ratio is revealed.•Effect of loading angle and loading ratio on crack growth with overload loading is discussed.•Stress–strain field and plastic deformation at crack tip are revealed by finite element method. Fatigue crack growth (FCG) behavior under mixed mode loading has been received extensive attention, including overload condition. The mixed mode I-II fatigue crack growth behavior of commercial pure titanium (CP-Ti) with tensile overload at negative load ratios was investigated by experiment and finite element method (FEM). The effects of loading angle, load ratio and overload on mixed mode I-II fatigue crack growth were discussed with a modified compact-tensile-shear (CTS) specimen. The mechanism of mixed mode crack growth with overload was revealed. Fatigue crack growth path and fatigue crack growth rate (FCGR) with/without overload were compared experimentally, and overload retardation effect was investigated. The variation of plastic zone and the distribution of stress and strain were simulated through finite element method. The mechanism of overload retardation effect of mixed mode I-II crack growth under compressive load was illustrated by microscopic perspective, crack closure and residual compressive stress at crack tip, and the weakening effect of mode II shear component and compressive load effect on overload retardation effect was demonstrated.
ISSN:0167-8442
1872-7638
DOI:10.1016/j.tafmec.2022.103294