Fatigue of LX-14 and LX-19 plastic bonded explosives

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The DOD uses the plastic bonded explosive (PBX) LX-14 in a wide variety of applications including shaped charges and explosively forged projectiles. LX- 19 is a higher energy explosive, which could be easily substituted for LX-14 because it contains the identical Estane 5703p binder and more energetic CL-20 explosive. Delivery systems for large shaped charges, such as TOW-2, include the Apache helicopter. Loads associated with vibrations and expansion from thermal excursions in field operations may, even at low levels over long time periods, cause flaws, already present in the PBX to grow. Flaws near the explosive/liner interface of a shaped ... continued below

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Hoffman, D. M., LLNL April 23, 1998.

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Description

The DOD uses the plastic bonded explosive (PBX) LX-14 in a wide variety of applications including shaped charges and explosively forged projectiles. LX- 19 is a higher energy explosive, which could be easily substituted for LX-14 because it contains the identical Estane 5703p binder and more energetic CL-20 explosive. Delivery systems for large shaped charges, such as TOW-2, include the Apache helicopter. Loads associated with vibrations and expansion from thermal excursions in field operations may, even at low levels over long time periods, cause flaws, already present in the PBX to grow. Flaws near the explosive/liner interface of a shaped charge can reduce performance. Small flaws in explosives are one mechanism (the hot spot mechanism) proposed for initiation and growth to detonation of PBXs like LX-14, PBXN 5, LX-04 and LX-17 among others. Unlike cast-cured explosives and propellants, PBXs cannot usually be compression molded to full density. Generally, the amount of explosive ignited by a shock wave is approximately equal to the original void volume. Whether or not these flaws or cracks grow during field operations to an extent sufficient to adversely affect the shaped charge performance or increase the vulnerability of the PBX is the ultimate question this effort could address. Currently the fatigue life of LX-14 under controlled conditions is being studied in order to generate its failure stress as a function of the number of fatigue cycles (S- N curve). Proposed future work will address flaw and crack growth and their relationship to hot-spot concentration and explosive vulnerability to shock and/or fragment initiation.

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20 p.; Other: FDE: PDF; PL:

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OSTI as DE98057934

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  • Joint Working Group (JOWOG) 9, Aldermaston (United Kingdom), 22-26 Jun 1998

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  • Other: DE98057934
  • Report No.: UCRL-JC--130514
  • Report No.: CONF-9806105--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 290587
  • Archival Resource Key: ark:/67531/metadc688376

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  • April 23, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 16, 2016, 7:08 p.m.

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Hoffman, D. M., LLNL. Fatigue of LX-14 and LX-19 plastic bonded explosives, article, April 23, 1998; California. (digital.library.unt.edu/ark:/67531/metadc688376/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.