Crystal plasticity (Multi-scale)

Material Point Models

Physics based constitutive modeling

ex. Temperature, strain-rate, and crystal orientation dependence of single crystal aluminum 

 

Finite Element Models (User-Defined Subroutines)

Single crystal finite element model

ex. Goss compression FCC single crystal a. before deformation, b. after deformation

 

Polycrystal finite element model

ex. Aluminum sample with large grains –Each color represents a grain.

 

ex. Polycrystal RVE of DP600 steel for a metal forming application

 

 

Modeling Additive Manufacturing Processes

Powder bed fusion process

ex. Thermal simulation of powder bed fusion process for IN718 with user-subroutines: Temperature and states (powder/liquid/solid).

 
Directed Energy Deposition Process 

ex. Thermal simulation of directed energy deposition process for IN718 with user-subroutines: Temperature distribution.

 

 

 

Single crystal micro machining model

Simulation of turning process for FCC single crystals

ex. Cutting force fluctuations for different crystallographic turning zone axes a. <100>, b. <110>, c. <111>, d. zone axis.

 

 

Residual stress analysis

Hole drilling method (experimental)

Available system: Vishay RS200 to measure residual stresses using hole drilling method according to the ASTM Standard E837.

 

High Energy X-ray Diffraction (at Cornell University – with Prof. P.R. Dawson)

ex. Two scale analysis methodology to find the macro scale stress distributions from lattice strain measurements

 

Micromechanics

Geometrically Necessary Dislocation calculation from EBSD maps

ex. Application to explain indentation size effect

Micro scale experiments

ex. Various micro scale samples prepared by Focused Ion Beam (FIB) milling method: Beams with round cross-section, cantilever beam during manufacturing, Bauschinger test sample and its EBSD map (from left to right) at Max Planck Institute for Iron Research with Prof. D. Raabe.