About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Algorithm Development in Materials Science and Engineering
|
Presentation Title |
Low Dimensional Polynomial Chaos Expansion Performance at Assessing Uncertainty in Creep Life Prediction of Grade 91 Steel |
Author(s) |
Timothy Truster, Amirfarzad Behnam, Varun Gupta, Ramakrishna Tipireddy |
On-Site Speaker (Planned) |
Timothy Truster |
Abstract Scope |
This talk examines time to minimum creep rate and its uncertainty with respect to a set of fourteen material parameters. The time elapsed to minimum rate correlates greatly to overall creep lifespan of materials and hence is an important quantity of interest. The microstructural model of Grade 91 steel includes both dislocation creep and grain boundary opening/sliding within a finite element model, and hence the simulations are relatively expensive and have several sources of nonlinearity. We will propagate uncertainty in the input material parameters of these two mechanisms and determine the aggregate uncertainty in the predicted time to minimum creep rate as well as the sensitivities of the parameters upon this prediction. The cost, stability, accuracy of the polynomial chaos expansion as a means for stochastic dimensional reduction using basis adaptation method is assessed against the classical Monte Carlo method. |
Proceedings Inclusion? |
Planned: |