Measurements of a 1/4-scale model of a 60-kg explosives firing chamber

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In anticipation of increasingly stringent environmental regulations, Lawrence Livermore National Laboratory (LLNL) proposes to construct a 60-kg firing chamber to provide blast-effects containment for, most of its open-air, high-explosive, firing operations. Even though these operations are within current environmental limits, containment of the blast effects and hazardous debris will further drastically reduce emissions to the environment and minimize the generated hazardous waste. The major design consideration of such a chamber is its overall structural dynamic response in terms of long-term containment of all blast effects from repeated internal detonations of high explosives. Another concern is how much other portions of ... continued below

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7 p.

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Pastrnak, J.W.; Baker, C.F. & Simmons, L.F. January 27, 1995.

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Description

In anticipation of increasingly stringent environmental regulations, Lawrence Livermore National Laboratory (LLNL) proposes to construct a 60-kg firing chamber to provide blast-effects containment for, most of its open-air, high-explosive, firing operations. Even though these operations are within current environmental limits, containment of the blast effects and hazardous debris will further drastically reduce emissions to the environment and minimize the generated hazardous waste. The major design consideration of such a chamber is its overall structural dynamic response in terms of long-term containment of all blast effects from repeated internal detonations of high explosives. Another concern is how much other portions of the facility must be hardened to ensure personnel protection in the event of an accidental detonation. To assess these concerns, a 1/4-scale replica model of the planned contained firing chamber was designed, constructed, and tested with scaled explosive charges ranging from 25 to 125% of the operational explosives limit of 60 kg. From 16 detonations of high explosives, 880 resulting strains, blast pressures, and temperatures within the model were measured. Factors of safety for dynamic yield of the firing chamber structure were calculated and compared to the design criterion of totally elastic response. The rectangular, reinforced-concrete chamber model exhibited a lightly damped vibrational response that placed the structure in alternating cycles of tension and compression. During compression, both the reinforcing steel and the concrete remained elastic. During tension, the reinforcing steel remained elastic, but the concrete elastic limit was exceeded in two areas, the center spans of the ceiling and the north wall, where elastic safety factors as low as 0.66 were obtained, thus indicating that the concrete would be expected to crack in those areas. Indeed, visual post-test inspection of those areas revealed tight cracks in the concrete.

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7 p.

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OSTI as DE95009476

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  • EUROPYRO `95, Tours (France), 5-9 Jun 1995

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  • Other: DE95009476
  • Report No.: UCRL-JC--117774
  • Report No.: CONF-9506168--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 42371
  • Archival Resource Key: ark:/67531/metadc685032

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  • January 27, 1995

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 17, 2016, 2:17 p.m.

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Pastrnak, J.W.; Baker, C.F. & Simmons, L.F. Measurements of a 1/4-scale model of a 60-kg explosives firing chamber, article, January 27, 1995; California. (digital.library.unt.edu/ark:/67531/metadc685032/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.