Investigating deformation and mesoscale void creation in HMX based composites using tomography based grain scale FEM

Walters, David J.; Luscher, Darby J.; Yeager, John D.; Patterson, Brian M.

doi:10.1063/1.5044840

Investigating deformation and mesoscale void creation in HMX based composites using tomography based grain scale FEM

Journal Article · Tue Jul 03 00:00:00 EDT 2018 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.5044840· OSTI ID:1565879

Walters, David J. ^[1]; Luscher, Darby J. ^[1]; Yeager, John D. ^[1]; Patterson, Brian M. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The microstructure of plastic bonded explosives (PBXs) significantly affects their macroscale mechanical characteristics. Imaging and modeling of the mesoscale constituents allows for a detailed examination of the deformation of mechanically loaded PBXs. In this study, a pair of explosive HMX crystals were bound with an HTPB based polymer binder and imaged using micro Computed Tomography ($$µ$$CT). Delamination of the polymer binder from the crystals was induced via macro-scale application of a tensile load. Cohesive parameters for simulation of the crystal/binder interface were determined by comparing numerical and experimental results of the delamination of this bi-crystal system. Simulations showed macro-scale plastic behavior is accommodated through both crystal-binder delamination and plastic deformation of the binder itself. Imaging and simulation of this bi-crystal system demonstrated the complex interplay of material constitutive behavior and grain-scale geometry. Successful parameterization of this relatively simple mechanical system is a step toward a better understanding void nucleation in similarly composed polycrystalline composites.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1565879

Report Number(s):: LA-UR--17-27813

Journal Information:: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1979; ISSN 0094-243X

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

Country of Publication:: United States

Language:: English

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