|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Prediction of Microstructurally–influenced Fatigue Crack Propagation
||Patrick Golden, Robert Brockman, Rebecca Hoffman, William Musinski, Sushant Jha, Reji John
|On-Site Speaker (Planned)
A methodology for simulating fatigue crack growth at the microstructural level has been developed, and is evaluated. The model operates on geometric data obtained from serial sectioning of microspecimens or statistically representative microstructure models. The model physics includes rate–dependent crystal plasticity, with submodels for fatigue crack driving parameters, grain boundary resistance, and tilt/twist effects on crack orientation. Cracking is represented using X–FEM. The methodology is implemented in a finite element code, Abaqus, using user subroutines to define the constitutive models, and to control the X–FEM features of the code. Analytical results illustrating microstructural crack growth are presented for instantiations of a nickel-base superalloy. The sensitivity of predicted crack growth rate and path behaviors is evaluated with respect to the crack driving force definition and model parameters such as grain boundary resistance and crack propagation model controls. Predictions of small crack growth behavior are compared to available data.
||Planned: Supplemental Proceedings volume