Crystal Plasticity Modelling and Simulation
This group focuses on building physical mechanism guided continuum level modeling approaches. Inside crystal plasticity FEM framework we try to achieve modeling results for special materials systems and boundary conditions which can be tested by smaller length scale modeling methods such as Discrete Dislocation Dynamics and Molecular Dynamics. For one integration point locally we may introduce one Repetitive Volume Element with proper homogenization approach, non-locally we also try to consider strain gradient and possible dislocation density flux between different integration points to study possible deformation heterogeneity inside multiphase materials.
We are interested in the following topics:
TRIP steel deformation modelling Superalloy Creep Modelling (see image below)
Deformation of turbine blades of superalloy single crystal is modeled by unit cell approach at integration points. At different temperature and stress regions precipitation strengthening work (creep only in matrix channels), failure (precipitates can be sheared), and variation (precipitate rafting) are considered.
Dislocations and Grain Boundaries
Dr. Anxin Ma
P. S. Engels, C. Begau, S. Gupta, B. Schmaling, et al. Multiscale Modeling of Nanoindentation: From Atomistic to Continuum Models, Nanomechanical Analysis of High Performance Materials, 203, 285-322, (2014), (Ed.: A. Tiwari)
P. S. Engels, A. Ma, A. Hartmaier, Continuum simulation of the evolution of dislocation densities during nanoindentation, International Journal of Plasticity, 38, 159-169, (2012)
D. K. Mahajan, A. Hartmaier, Mechanisms of crazing in glassy polymers revealed by molecular dynamics simulations, Physical Review E, 86, 021802, (2012)
A. Köster, A. Ma, A. Hartmaier, Atomistically informed crystal plasticity model for body-centered cubic iron, Acta Materialia, 60, 3894–3901, (2012)
N. Vajragupta, V. Uthaisangsuk, B. Schmaling, S. Münstermann, et al. A micromechanical damage simulation of dual phase steels using XFEM, Computational Materials Science , 54, 271-279, (2012)