Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session U05: Damage and Spall II
11:00 AM–12:15 PM,
Thursday, July 14, 2022
Anaheim Marriott
Room: Platinum 3
Chair: Veronica Anghel, Los Alamos National Laboratory
Abstract: U05.00003 : Statistical distribution of mechanical properties to initiate adiabatic shear banding in thick walled collapsing cylinders
11:30 AM–11:45 AM
Presenter:
Mathieu Xavier
(CEA, DAM,DIF)
Authors:
Mathieu Xavier
(CEA, DAM,DIF)
Cyril Bolis
(CEA, DAM, DIF)
Recent works by Rittel and al., 2006 identified dynamic stored energy of the deformation process as the mechanism responsible for the formation of ASB. Constitutive models have therefore been proposed to include this positive feedback mechanism to trigger the formation of ASB. An energy-based damage parameter (see Dolinski and al., 2010) is used to capture the flow stress decrease.
However, an initial perturbation is required to break the symmetry and initiate ASB. While geometric perturbations in the mesh are often used, in this presentation, an approach based on a statistical distribution of mechanical properties as the initial perturbation is proposed. Properties are distributed on a mesh-independent pattern to ensure numerical repetability. Influence of cell sizes and amplitude of perturbation on shear band patterns is discussed on collapsing cylinders experiments by Lovinger and al., 2011.
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