Thesis Defense: Jinlei Shen, "Multi-scale Modeling of Deformation and Micro-texture Region Effect on Fatigue Crack Nucleation in Two-phase Titanium Alloy Using Parametrically Upscaled Constitutive Models"

The Department of Civil and Systems Engineering
and
Advisor Somnath Ghosh, Professor 

Announce the Thesis Defense of

 Jinlei Shen

Wednesday, June 29^th

1:00 pm

In person: Latrobe Hall, Rm 106
Virtual: Contact Elena Shichkova for connection information

“MULTI-SCALE MODELING OF DEFORMATION AND MICRO-TEXTURE REGION EFFECT ON FATIGUE CRACK NUCLEATION IN TWO-PHASE TITANIUM ALLOY USING PARAMETRICALLY UPSCALED CONSTITUTIVE MODELS”

Dual-phase Titanium alloys are important materials that have been prevalently used in the aerospace industry. On the other hand, the structural component made of those alloys is known to suffer from the dwell fatigue, which is inherently dependent on the local material microstructure, especially with the presence of Micro-texture regions (MTRs) that is conventionally defined as the cluster of grains with similar crystallographic orientations, and can be hundred times larger than the single grain. This thesis develops Parametrically Upscaled Constitutive Model (PUCM) and the Parametrically Upscaled Crack Nucleation Model (PUCNM) for a commercially used α/β-phase Ti64 alloy to modeling the deformation and fatigue crack nucleation at structural scale.