About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales III
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Presentation Title |
Simulation of Creep and Uniaxial Strain in 316H Steel via a Fully Mechanistic Fast Fourier Transform Based Crystal Plasticity Constitutive Model |
Author(s) |
Nathan James Beets, Laurent Capolungo, Arul Kumar Mariyappan, Ricardo A. Lebensohn |
On-Site Speaker (Planned) |
Nathan James Beets |
Abstract Scope |
Modeling the mechanical response of materials from the dynamic interplay of different microstructural phenomena is critical for material response prediction and development. We present a mechanistic crystal plasticity constitutive model, which is used to simulate thermal creep and uniaxial stress strain conditions. A dislocation kinetics law defines local plastic slip with latent hardening evolution which includes a contribution from precipitate concentration. Diffusion is modeled with a Coble creep law. Dislocation climb is modeled via activation law dependent on the concentration and diffusivity of vacancies. This framework is incorporated into a full field, Fast Fourier Transform (FFT) parallelized solver that predicts the local and global material response while also capturing microstructural evolution. The creep response for 316H steel under various conditions of temperature, stress, and precipitate content is predicted and compared to experimental measurements. The relative contribution of various mechanisms is analyzed and is represented with an Ashby Weertman map. |