Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 147, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2021.103086
Keywords
A; creep; B; crystal plasticity; B; viscoplastic material; B; porous material; C; finite elements
Funding
- United States Department of Energy's Office of Fossil Energy (USDOE-FE) Crosscutting Research Program
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In this study, a physics-based crystal plasticity model was developed to predict failure in Grade 91 steel. A material response database and a new reduced-order lifetime predictor were generated, and the proposed lifetime assessment tool predicted rupture times several orders more conservative compared to current empirically derived lifetime relations.
In this work, a physics-based crystal plasticity model is developed to predict failure in Grade 91 steel. A microstructure-sensitive dislocation kinetics law defines local plastic slip, an Arrhenius creep law is used to model vacancy-mediated plasticity, and strain hardening evolves with local dislocation density. As voids nucleate, a reaction-diffusion framework is adopted to dynamically track the local void size distributions, which grow by coupled viscoplastic and diffusive processes. Upon accurately reproducing the temperature and stress dependencies in primary, secondary, and tertiary creep seen experimentally for Grade 91 steel, the model is exercised to generate a material response database across a wide range of operating conditions. A new reduced-order lifetime predictor is developed from numerical predictions, and a Bayesian framework is used to quantify prediction uncertainties. When compared to current empirically derived lifetime relations, the proposed lifetime assessment tool predicts rupture times up to several orders more conservative.
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