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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Practical Tools for Integration and Analysis in Materials Engineering
Presentation Title A Fast Fourier Transform Based Crystal Plasticity Constitutive Model for Predicting Creep and Rupture Lifetime in Metallic Systems
Author(s) Nathan James Beets, Laurent Capolungo, Arul Kumar Mariyappan, Ricardo Lebensohn
On-Site Speaker (Planned) Nathan James Beets
Abstract Scope Accurately predicting creep response and rupture lifetime of metallic components under high temperatures and multiaxial stresses is critical to the rapidly evolving energy industry. To this end, we present a mechanistic crystal plasticity-based constitutive model, used to derive engineering-scale creep rupture life criteria. A microstructure-sensitive dislocation kinetics law defines local plastic slip, a Coble creep law models vacancy-mediated plasticity, and latent hardening evolves local dislocation density. Void nucleation/growth are tracked via reaction- diffusion framework and coupled viscoelastic and diffusive dissipative processes. This physical-based framework is incorporated into a parallelizable code which uses fast Fourier transforms (FFTs) to predict the local and global stress response of the material. This framework is faster than FEM-based elasto-viscoplastic codes and therefore can be efficiently used in combination with data analytics and surrogate modeling techniques. In conjunction with a fitting procedure, this enables the determination of a rupture-lifetime criteria for 347H steel.
Proceedings Inclusion? Planned:
Keywords Computational Materials Science & Engineering, Mechanical Properties, Nuclear Materials

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A Fast Fourier Transform Based Crystal Plasticity Constitutive Model for Predicting Creep and Rupture Lifetime in Metallic Systems
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