About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Multi-scale Modeling and Uncertainty Quantification of Fatigue Crack Nucleation in Titanium Alloys with Parametrically Homogenized Constitutive Models |
Author(s) |
Deniz Ozturk, Shravan Kotha, Somnath Ghosh |
On-Site Speaker (Planned) |
Deniz Ozturk |
Abstract Scope |
Parametrically-Homogenized Constitutive Models (PHCM) and Fatigue Crack Nucleation Models (PHCNMs) for Titanium alloys have been previously developed from computational homogenization of CPFE analysis results performed on 3D polycrystalline RVEs. The constitutive parameters of PHCMs have direct dependence on the morphological and crystallographic variables of the microstructure, and PHCMs are incorporated in commercial FEA codes as user material subroutines for microstructure-sensitive modeling of structural components. An uncertainty quantification framework is developed for PHCMs for multi-scale modeling of deformation and fatigue crack nucleation in structural components, accounting for material microstructural uncertainty, model reduction errors and calibration data sparsity. Microstructural uncertainty is represented by statistical moments of microstructural parameters calculated from multiple EBSD scans. A novel uncertainty propagation method is developed to propagate the uncertainties in PHCM constitutive parameters and microstructural variables to the model output variables of interest, such as stress, strain or macroscopic fatigue measures, while avoiding expensive Monte Carlo simulations. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |