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- Title
Prediction of fatigue crack nucleation life in polycrystalline AA7075-T651 using energy approach.
- Authors
Naderi, M.; Amiri, M.; Iyyer, N.; Kang, P.; Phan, N.
- Abstract
A crystal plasticity (CP) simulation and an energy-based model is presented to predict the fatigue nucleation onset for polycrystalline AA 7075-T651. Different microstructure morphology and grain sizes are employed in the simulations. Using a simple method, statistically stored dislocation (SSD) and geometrically necessary dislocation (GND) as decoupled with crystal plasticity model are estimated using a double round-notch specimen test data, and CP simulation. The dislocation density parameter approximated from plastic energy density, stored energy density, elastic energy and accumulated slip validated with double hole experimental data. Sensitivity analysis is performed with respect to different microstructures and dislocation density parameters. Roughly, maximum 30% difference between experimental nucleation life and the simulated one is observed. The simulated predictions are in fair agreement with test data. The proposed strategy is suitable to study the scatter of fatigue nucleation life.
- Subjects
NUCLEATION; FATIGUE cracks; FATIGUE life; ENERGY density; MICROSTRUCTURE
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2016, Vol 39, Issue 2, p167
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12346