About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Measuring and Modelling the Elastoplastic Transition at the Microstructural Scale |
Author(s) |
Joao Quinta da Fonseca, Michael Atkinson, Dongchen Hu, David Lunt, Conghui Liu |
On-Site Speaker (Planned) |
Joao Quinta da Fonseca |
Abstract Scope |
Crystal plasticity modelling is often used to simulate the local stresses and strains at the microstructural scale. However, the models used are invariably calibrated and validated at the macroscopic scale only. Here we present the results of a number of attempts to validate model predictions at the microstructural scale. High resolution digital image correlation was used to measure the strain distribution with sub-micro resolution during the onset of yield and beyond. Measurements were done during monotonic and cyclic loading, in titanium and nickel based aerospace alloys. The results were compared with CP simulation results, using image based models and statistically representative models. This work showed that the crystal plasticity predictions of slip activity and strain localization are very different from those measured experimentally. The implications of these results to the applicability of crystal plasticity modelling to the prediction of the effect of microstructure on fatigue crack initiation will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, Titanium |