Coefficient of Thermal Expansion Evolution during Ratchet Growth of PBX 9502 and Neat TATB

Woznick, Caitlin S.; Graff Thompson, Darla; Scott, Sidney J.

doi:10.1002/prep.202100322

Coefficient of Thermal Expansion Evolution during Ratchet Growth of PBX 9502 and Neat TATB

Journal Article · Fri Feb 25 00:00:00 EST 2022 · Propellants, Explosives, Pyrotechnics

DOI:https://doi.org/10.1002/prep.202100322· OSTI ID:1874198

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

The Plastic-Bonded Explosive (PBX) 9502 is comprised of the insensitive high explosive TATB (triamino trinitrobenzine) crystals coated in FK-800 polymer binder and isostatically pressed. The TATB crystals have a graphitic, plate-like morphology and possess significant thermal and mechanical anisotropy. Compactions of neat TATB or TATB-based composites (like PBX 9502) have been shown to have TATB crystals that are oriented during the pressing process giving rise to TATB texture and resulting in micro- and macro-scale anisotropy of the compaction. Thermal cycling of the compactions results in irreversible volume expansion (or ratchet growth) likely by creating stress points on the microscale. However, the actual mechanism behind this expansion is not fully understood. Previous characterization of the ratchet growth phenomenon has focused on the magnitude of the irreversible strain as measured before and after a thermal cycle. In the work presented here, we analyze the evolving thermal expansion behavior during the ascending and descending temperature ramps and compare differences observed due to the presence/absence of binder in the compaction.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1874198

Report Number(s):: LA-UR-21-30683

Journal Information:: Propellants, Explosives, Pyrotechnics, Journal Name: Propellants, Explosives, Pyrotechnics Journal Issue: 5 Vol. 47; ISSN 0721-3115

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
CTE
ratchet growth
TATB
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irreversible expansion

Coefficient of Thermal Expansion Evolution during Ratchet Growth of PBX 9502 and Neat TATB

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References (14)

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