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- W2771774435 abstract "Abstract The fatigue limit of aluminium alloys is logically modelled as edge dislocations against grain boundaries. A fictitious shear crack is envisioned to represent the fatigue limit condition. By using continuous configuration in the dislocation pile-up, the crack tip sliding displacement can be determined for the shear crack and the fatigue limit is attained when the shear crack is just onset to grow across the grain boundary. The fatigue crack growth threshold ΔKth is simulated to be composed to two components: the microstructural threshold ΔKthi and the physical threshold ΔKthc. Crack tip blunting is considered, regardless of closure mechanisms, to be a fundamental physical phenomenon associated with the fatigue crack growth threshold. The ΔKth condition is modelled as no microcrack initiation occurs at the blunted crack front. As a result, a micromechanical model is developed that predicts the ΔKth at different load ratios without invoking crack closure. A novel feature of the model is that the fatigue crack growth threshold can be predicted in terms of mechanical and cyclic fatigue properties. The model also shows a strong dependence of the fatigue crack growth threshold of aluminium alloys upon local microstructure. Finally, consistent predictions of ΔKth are demonstrated for aluminium alloys." @default.
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- W2771774435 date "1997-01-01" @default.
- W2771774435 modified "2023-09-24" @default.
- W2771774435 title "Theoretical modelling of fatigue threshold for aluminium alloys" @default.
- W2771774435 hasPublicationYear "1997" @default.
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