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Thursday, January 05, 2012
10:00 AM - 11:00 AM
CNLS Conference Room (TA-3, Bldg 1690)

Postdoc Seminar

Phenomenological elastoplasticity for anisotropic media, X-ray diffraction experiments and simulation

John Edmiston
University of California - Berkeley

The general subject matter of this presentation is continuum plasticity of crystalline materials. Recent advances in synchrotron X-ray diffraction experimental capabilities show promise for extracting quantitative constitutive information of the elastic-plastic deformation of crystalline materials. This talk presents background and preliminary results from an in situ experiment performed at the Advanced Photon Source, Sector 1-ID. This experiment deformed a polycrystalline Titanium alloy into the plastic region, with continuous diffraction measurement. Slip system strength and evidence of plastic flow have been observed from this experiment. Additionally, a phenomenological theory of plasticity for single crystals is presented, using a classical anisotropic continuum model to generate constitutive functions. Qualitative comparison of numerical results with crystal plasticity theory are encouraging for further study of the model.

Host: Duan Z. Zhang T-3, B216