3D micromechanical simulation of PBX composites

Walters, David J.; Luscher, Darby Jon; Yeager, John David

doi:10.1063/12.0000922

3D micromechanical simulation of PBX composites

Journal Article · Sun Nov 01 23:00:00 EST 2020 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/12.0000922· OSTI ID:2000902

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Previous research studied the constitutive response and interface strength of a bonded bicrystal system containing two HMX explosive grains bound with a HTPB polymer binder by performing FE simulations on real geometry imaged with micro Computed Tomography (µCT). The parameters generated from this past study were successfully applied to 2D mesoscale simulations of µCT imaged HMX-HTPB polycrystal samples. Presently, the mechanical response of PBXs containing a Nitro-Plasticized Estane (NPE) binder with similar microstructural geometry to the HMX-HTPB polycrystal samples were studied. Imaging of a HMX-NPE bicrystal sample allowed for simulation of the new material pairing. However, imaging using µCT techniques on the new polycrystal samples was difficult due to the decrease in contrast between the HMX grains and the NPE binder. Mesoscale polycrystal simulations utilizing a single µCT imaged microstructure were performed on a 3D representative volume element (RVE) comparing the delamination behavior and mechanical response of both HMX-HTPB and HMX-NPE PBXs. Furthermore, this technique shows the ability to virtually explore the mechanical response of a range of hypothetical materials that share common microstructural geometric characteristics in addition to studying numerically altered geometries.

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2000902

Report Number(s):: LA-UR--19-27205

Journal Information:: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Vol. 2272; ISSN 0094-243X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
computed tomography
direct numerical simulation
explosives
mesoscale
micromechanics
polycrystalline material

3D micromechanical simulation of PBX composites

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