Fatigue crack growth microstructural mechanisms and texture-sensitive predictive modeling of lightweight structural metals

•Slip length controls crack growth behavior in studied lightweight structural alloys.•Critical stress intensity and grain size control intergranular failure transition.•Design maps visually interpolate crack growth mechanisms to untested stress ratios.•Grain-sensitive model predicts microstructurall...

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Bibliographic Details
Published in:International journal of fatigue 2021-08, Vol.149, p.106278, Article 106278
Main Authors: Gavras, Anastasios G., Spangenberger, Anthony G., Lados, Diana A.
Format: Article
Language:English
Subjects:
Aluminum
Aluminum alloys
Crack propagation
Fatigue crack growth
Fatigue failure
Fracture mechanics
Grain orientation
Grain size
Materials fatigue
Materials selection
Metal fatigue
Microstructure
Prediction models
Safety critical
Stress ratio
Titanium alloys
Titanium base alloys
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Summary:•Slip length controls crack growth behavior in studied lightweight structural alloys.•Critical stress intensity and grain size control intergranular failure transition.•Design maps visually interpolate crack growth mechanisms to untested stress ratios.•Grain-sensitive model predicts microstructurally small crack growth rates well. Long and small fatigue crack growth (FCG) mechanisms of various light structural aluminum and titanium alloys were studied with respect to microstructure, stress ratio, and initial flaw size and related to the effective slip length (grain and phase boundaries). Damage mechanism maps were developed to provide design tools to improve material selection for safety-critical structural components. A predictive model for grain size-controlled microstructurally small FCG was developed with consideration of crack size, grain orientation, and the stochastic effects of discrete microstructural interactions. The model allows for rapid estimation of small FCG behavior and agrees well with experimental data.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2021.106278