A DCAMM seminar will be presented by
Senior Scientist Ricardo A Lebensohn
Los Alamos National Laboratory, Los Alamos
New Mexico, USA
Abstract:
Crystal plasticity (CP) models are increasingly used in engineering applications to obtain microstructure-sensitive mechanical response of polycrystalline materials. These models require a proper consideration of the single crystal deformation mechanisms, a representative description of the microstructure, and an appropriate scheme to connect the microstates with the macroscopic response. Full-field Fast Fourier Transform (FFT)-based methods, originally proposed by Moulinec and Suquet [1] for composites and extended by us to poly-crystals [2] are attractive due to their relative higher efficiency compared with CP-Finite Elements, and their direct use of voxelized microstructural images. In this talk, we will report recent progress on FFT-based polycrystal plasticity, with emphasis in novel implementations, including large-strain elasto-visco-plasticity, strain-gradient plasticity, creep, and dynamic deformation/inertial effects.
We will show applications of FFT-based methods to micromechanics of nano-metallic laminates (NMLs), creep lifetime predictions of steels, and integration with 3-D characterization methods.
[1] Moulinec, H., Suquet, P., 1998. A numerical method for computing the overall response of nonlinear composites with complex microstructure. Computer Methods in Applied Mechanics and Engineering 157, 69-94.
[2] Lebensohn, R.A., 2001. N-site modelling of a 3D viscoplastic polycrystal using Fast Fourier Transform. Acta Materialia 49, 2723-2737.
Danish pastry, coffee and tea will e served 15 minutes before the seminar starts.
All interested persons are invited