Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A17: Matter in Extreme Environments: Energetic Materials
8:00 AM–10:24 AM,
Monday, March 4, 2019
BCEC
Room: 156A
Sponsoring
Unit:
DCOMP
Chair: Maosheng Miao, California State University, Northridge
Abstract: A17.00005 : Temperature evolution in plastic bonded explosives during impacts
9:12 AM–9:24 AM
Presenter:
Nisha Mohan
(Los Alamos National Laboratory)
Authors:
Nisha Mohan
(Los Alamos National Laboratory)
Darby J Luscher
(Los Alamos National Laboratory)
Marc Cawkwell
(Los Alamos National Laboratory)
Kyle J Ramos
(Los Alamos National Laboratory)
The heterogeneous, polycrystalline structure of plastic-bonded explosives (PBX) leads to temperature localization under impacts. The thermo-mechanical responses of PBXs span processes from dislocation-mediated plasticity at small-scales to interfacial stress wave reflection and diffusion at higher scales. The thermal and deformation localization response under impact of a RDX/estane PBX have been studied using finite element simulations with ABAQUS. The modeling framework combines a dislocation-based, anisotropic, single crystal plasticity model with a visco-elastic constitutive model for estane. We systematically studied how heating arising from wave interactions and localized plasticity in the PBX depends on the impact velocity, slip resistance, grain orientation, position, and proximity to stress concentrators. The broadening of the shock front with increasing run distance by the microstructure of the PBX was found to play an important role in the evolution of temperature in the PBX. Grains with certain orientations produced higher temperatures and larger localized zones. Higher intrinsic resistance to slip restricts the dislocation density growth and thermal localization.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700