In situ imaging during compression of plastic bonded explosives for damage modeling

Manner, Virginia Warren; Yeager, John David; Patterson, Brian M.; Walters, David J.; Stull, Jamie Ann; Cordes, Nikolaus L.; Luscher, Darby Jon; Henderson, Kevin C.; Schmalzer, Andrew Michael; Tappan, Bryce C.

doi:10.3390/ma10060638

Title: In situ imaging during compression of plastic bonded explosives for damage modeling

Journal Article · Sat Jun 10 00:00:00 EDT 2017 · Materials

DOI:https://doi.org/10.3390/ma10060638· OSTI ID:1369210

Manner, Virginia Warren ^[1];

^[1];

^[1]; Stull, Jamie Ann ^[1]; Cordes, Nikolaus L. ^[1];

^[1];

^[1]

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

Here, the microstructure of plastic bonded explosives (PBXs) is known to influence behavior during mechanical deformation, but characterizing the microstructure can be challenging. For example, the explosive crystals and binder in formulations such as PBX 9501 do not have sufficient X-ray contrast to obtain three-dimensional data by in situ, absorption contrast imaging. To address this difficulty, we have formulated a series of PBXs using octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) crystals and low-density binder systems. The binders were hydroxyl-terminated polybutadiene (HTPB) or glycidyl azide polymer (GAP) cured with a commercial blend of acrylic monomers/oligomers. The binder density is approximately half of the HMX, allowing for excellent contrast using in situ X-ray computed tomography (CT) imaging. The samples were imaged during unaxial compression using micro-scale CT in an interrupted in situ modality. The rigidity of the binder was observed to significantly influence fracture, crystal-binder delamination, and flow. Additionally, 2D slices from the segmented 3D images were meshed for finite element simulation of the mesoscale response. At low stiffness, the binder and crystal do not delaminate and the crystals move with the material flow; at high stiffness, marked delamination is noted between the crystals and the binder, leading to very different mechanical properties. Initial model results exhibit qualitatively similar delamination.

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

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1369210

Report Number(s):: LA-UR-17-23838; MATEG9

Journal Information:: Materials, Vol. 10, Issue 6; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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Cited By (3)

Glycidyl Azide Polymer and its Derivatives-Versatile Binders for Explosives and Pyrotechnics: Tutorial Review of Recent Progress Jarosz, Tomasz; Stolarczyk, Agnieszka; Wawrzkiewicz-Jalowiecka, Agata Molecules, Vol. 24, Issue 24 https://doi.org/10.3390/molecules24244475	journal	December 2019
Importance of microstructural features in mechanical response of cast-cured HMX formulations Yeager, John D.; Manner, Virginia W.; Stull, Jamie A. SHOCK COMPRESSION OF CONDENSED MATTER - 2017: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, AIP Conference Proceedings https://doi.org/10.1063/1.5044842	conference	January 2018
Effect of initial damage variability on hot-spot nucleation in energetic materials Duarte, Camilo A.; Grilli, Nicolò; Koslowski, Marisol Journal of Applied Physics, Vol. 124, Issue 2 https://doi.org/10.1063/1.5030656	journal	July 2018

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