|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Simulation of Microstructurally-influenced Fatigue Crack Propagation
||Patrick Golden, Robert A Brockman, Rebecca M Hoffman, William D Musinski, Sushant K Jha, Reji John
|On-Site Speaker (Planned)
A physical model and computational methodology for simulating fatigue crack growth at the microstructural level is developed. The model operates on geometric data obtained from serial sectioning of microspecimens or statistically representative microstructure models. The model physics uses rate-dependent crystal plasticity, with submodels for fatigue crack driving parameters, grain boundary resistance, and tilt/twist effects on crack orientation. Cracking is represented explicitly using the Extended Finite Element Method (X-FEM). The computational methodology is implemented in a general-purpose finite element code, Abaqus, using a system of user-supplied plug-in modules to define the constitutive models, and to access and control the X-FEM features of the code. The method works with either voxellated or grain-conforming meshes using hexahedral or tetrahedral finite elements. Analytical results illustrating applications to microstructural crack growth are presented for instantiations of a nickel-base superalloy.
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