Building an Efficient Model for Afterburn Energy Release

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Many explosives will release additional energy after detonation as the detonation products mix with the ambient environment. This additional energy release, referred to as afterburn, is due to combustion of undetonated fuel with ambient oxygen. While the detonation energy release occurs on a time scale of microseconds, the afterburn energy release occurs on a time scale of milliseconds with a potentially varying energy release rate depending upon the local temperature and pressure. This afterburn energy release is not accounted for in typical equations of state, such as the Jones-Wilkins-Lee (JWL) model, used for modeling the detonation of explosives. Here we ... continued below

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Alves, S; Kuhl, A; Najjar, F; Tringe, J; McMichael, L & Glascoe, L February 3, 2012.

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Many explosives will release additional energy after detonation as the detonation products mix with the ambient environment. This additional energy release, referred to as afterburn, is due to combustion of undetonated fuel with ambient oxygen. While the detonation energy release occurs on a time scale of microseconds, the afterburn energy release occurs on a time scale of milliseconds with a potentially varying energy release rate depending upon the local temperature and pressure. This afterburn energy release is not accounted for in typical equations of state, such as the Jones-Wilkins-Lee (JWL) model, used for modeling the detonation of explosives. Here we construct a straightforward and efficient approach, based on experiments and theory, to account for this additional energy release in a way that is tractable for large finite element fluid-structure problems. Barometric calorimeter experiments have been executed in both nitrogen and air environments to investigate the characteristics of afterburn for C-4 and other materials. These tests, which provide pressure time histories, along with theoretical and analytical solutions provide an engineering basis for modeling afterburn with numerical hydrocodes. It is toward this end that we have constructed a modified JWL equation of state to account for afterburn effects on the response of structures to blast. The modified equation of state includes a two phase afterburn energy release to represent variations in the energy release rate and an afterburn energy cutoff to account for partial reaction of the undetonated fuel.

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PDF-file: 18 pages; size: 0.6 Mbytes

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  • Presented at: 82nd Shock and Vibration Symposium, Baltimore, MD, United States, Oct 30 - Nov 04, 2011

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  • Report No.: LLNL-PROC-528333
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1035972
  • Archival Resource Key: ark:/67531/metadc832748

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 3, 2012

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 22, 2016, 9:45 p.m.

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Alves, S; Kuhl, A; Najjar, F; Tringe, J; McMichael, L & Glascoe, L. Building an Efficient Model for Afterburn Energy Release, article, February 3, 2012; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc832748/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.