About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Parametrically Upscaled Constitutive Models for Multiscale Analysis of Fatigue Nucleation in Ti Alloys |
| Author(s) |
Somnath Ghosh, Tawqeer Tak, Kishore Nair |
| On-Site Speaker (Planned) |
Somnath Ghosh |
| Abstract Scope |
This talk will discuss the Parametrically Upscaled Constitutive Model (PUCM) for multiscale analysis of metals and alloys like the Ti alloy Ti-6AL-4V. The PUCMs represent higher-scale constitutive models whose coefficients are explicit functions of Representative Aggregated Microstructural Parameters (RAMPs), representing statistical functions of key morphological and crystallographic descriptors of the underlying microstructure. Functional forms of the PUCM constitutive parameters in terms of RAMPs are obtained using machine learning, e.g., Genetic Programming Symbolic Regression (GPSR), operating on the micromechanical response data sets generated by CPFEM simulations. The talk will discuss integrating the PUCM for predicting component-scale deformation with the Parametrically Upscaled Crack Nucleation Model (PUCNM) for fatigue crack nucleation in polycrystalline Ti-64 microstructures containing micro-texture regions (MTR). Studies will examine the interplay between the specimen geometry, macroscopic stresses, and the underlying microstructure with MTRs on the nucleation life. |