Multiscale investigation of the microstructural mechanisms driving ratchet growth in PBX 9502

Yeager, John David; Montanari, Danielle Elizabeth; Woznick, Caitlin Savanna; Knepper, Robert; Bennett, Kane

doi:10.1080/07370652.2022.2032485

Title: Multiscale investigation of the microstructural mechanisms driving ratchet growth in PBX 9502

Journal Article · 30 January 2022 · Journal of Energetic Materials

DOI: https://doi.org/10.1080/07370652.2022.2032485 · OSTI ID:1880497

^[1]; Montanari, Danielle Elizabeth ^[1];

^[1]; Knepper, Robert ^[2];

^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The high explosive PBX 9502 undergoes irreversible expansion during thermal cycling (“ratchet growth”). Recent innovations in thermomechanical modeling via homogenization strategies are beginning to incorporate mesoscale information such as grain size, total porosity, and spatial distribution of voids and cracks. To generate a complete experimental data set to challenge and inform these models, PBX 9502 pellets were thermally cycled, cross-sectioned using ion polishing, and imaged in high resolution with scanning electron microscopy. Ratchet growth was found to drive expansion through microcracking. Microcracks were affected by agglomeration of crystals within the PBX. Virgin material showed greater ratchet growth than recycled material.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; NA0003525

OSTI ID:: 1880497

Report Number(s):: LA-UR-21-29535

Journal Information:: Journal of Energetic Materials, Journal Name: Journal of Energetic Materials Journal Issue: 1 Vol. 42; ISSN 0737-0652

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
PBX
PBX 9502
SEM
cracks
insensitive explosive
microcracking
microstructure
plastic-bonded explosive
porosity
ratchet growth
scanning electron microscopy
thermal stability
triaminotrinitrobenzene

Title: Multiscale investigation of the microstructural mechanisms driving ratchet growth in PBX 9502

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