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H. Keo Springer

Portrait of  H. Keo Springer

  • Title
    DGL, Hazard Response & Mesoscale; Senior Staff Scientist
  • Email
    keo@llnl.gov
  • Phone
    (925) 424-6502
  • Organization
    Not Available

Background

Keo has worked at LLNL for over 20 years and conducts research in energetic materials (EM). He has over 50 publications including a book chapter. Keo leads EM model development and experimental validation efforts for multiple programs. Under his leadership, advanced EM models have been developed in LLNL multi-physics hydrocodes: Mesoscale modeling to understand process-structure-property-performance relationships in explosives; HERMES (High Explosive Reaction to MEchanical Stimulus) model to assess non-shock ignition, deflagration, and transition to detonation; Formulation sensitive reactive flow models for compositionally-graded explosives; Generalized Detonation Model for assessing effects over a wide range of explosive types. Keo enjoys working at LLNL where national security intersects science and engineering.

Ph.D., Mechanical Engineering, University of California, Davis, CA

M.S., Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

B.S., Mechanical Engineering, Cal Poly, San Luis Obispo, CA

  1. H. Keo Springer, S. Bastea, M.P. Kroonblawd, C.M. Miller, Effects of grain surface morphology on hotspot mechanisms in HMX and development of a neural network surrogate model for reaction rates, Propellants, Explosives, Pyrotechnics, (2022) submitted
  2. Matthew P. Kroonblawd and H. Keo Springer, Predicted Melt Curve and Liquid Shear Viscosity of RDX up to 30 GPa, Propellants, Explosives, Pyrotechnics, (2022) accepted
  3. Christopher M. Miller and H. Keo Springer, "Probabilistic effects of porosity and chemical kinetics on the shock initiation of an octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) based explosive", Journal of Applied Physics 129, 215104 (2021) https://doi.org/10.1063/5.0049122
  4. Svjetlana StekovicH. Keo SpringerMithun BhowmickDana D. Dlott, and D. Scott Stewart, "Laser-driven flyer plate impact: Computational studies guided by experiments", Journal of Applied Physics 129, 195901 (2021) https://doi.org/10.1063/5.0049817
  5. H. Keo Springer, S. Bastea, G.C. Egan, M. Chaos, R.V. Reeves, B.W. White, E.V. Bukovsky, K.T. Sullivan, Development of a Formulation Sensitive Reactive Flow Model For Explosive Mixtures, Proceedings of the JANNAF 43rd PEDCS Joint Subcommittee Meeting (2021). 
  6. Dane M. SterbentzJames R. GambinoPhilip C. MyintJean-Pierre DelplanqueH. Keo Springer, Michelle C. Marshall, and Jonathan L. Belof, "Drive-pressure optimization in ramp-wave compression experiments through differential evolution", Journal of Applied Physics 128, 195903 (2020) https://doi.org/10.1063/5.0023361
  7. Svjetlana StekovicH. Keo Springer, Mithun Bhowmick, and Dana D. Dlott, "Computational studies of laser-driven flyer impact experiments to probe properties of inert and energetic materials", AIP Conference Proceedings 2272, 070045 (2020) https://doi.org/10.1063/12.0000795
  8. Graham D. KosibaHarry K. SpringerWilliam L. Shaw, and Richard H. Gee, "Determining shock response of PETN-based explosives with grain-scale simulations", AIP Conference Proceedings 2272, 070022 (2020) https://doi.org/10.1063/12.0000954
  9. H. Keo SpringerJ. R. GambinoS. BasteaA. L. Nichols, and C. M. Tarver, "Hot spot criticality in shocked HMX over a range of pore sizes and pressures", AIP Conference Proceedings 2272, 070044 (2020) https://doi.org/10.1063/12.0000961
  10. (Front Cover) H. Keo Springer, W. P. Bassett, S. Bastea, S. Stekovic, C. M. Tarver, Modeling Hot Spot Experiments on Shocked Octahydro-1,3,5,7-Tetranitro-1,3,5,7-Tetrazocine, Prop., Explos., Pyrotech. 202045, 330. https://doi.org/10.1002/prep.201900195
  11. (Front Cover) H. Keo Springer, S. Bastea, A.L. Nichols III, C.M. Tarver and J. E. Reaugh, Modeling The Effects of Shock Pressure and Pore Morphology on Hot Spot Mechanisms in HMX. Propellants, Explosives, Pyrotechnics, 43(8), pp.805-817 (2018)  https://doi.org/10.1002/prep.201880801
  12. Reaugh, J.E., White, B.W., Curtis, J.P. and Springer, H.K., A Computer Model to Study the Response of Energetic Materials to a Range of Dynamic Loads. Propellants, Explosives, Pyrotechnics (2018).
  13. Springer, H.K., Tarver, C.M., Gambino, J.R., White, B.W., Sullivan, K.T. and Gash, A.E., Numerical study on tailoring the shock sensitivity of TATB-based explosives using sub-millimeter features. In AIP Conference Proceedings (Vol. 1979, No. 1, p. 180009). AIP Publishing. (2018).
  14. Gambino, J.R., Tarver, C.M. and Springer, H.K., Numerical parameter optimizations of the Ignition and Growth model for a HMX plastic bonded explosive. Journal of Applied Physics, 124(19), p.195901 (2018).
  15. Myint, P.C., Gersten, B.T., McClelland, M.A., Nichols III, A.L. and Springer, H.K., Entropy maximization and free energy minimization of multiphase mixtures using particle swarm optimization. In AIP Conference Proceedings (Vol. 1979, No. 1, p. 030006). AIP Publishing (2018).
  16. Kevin S. VandersallMartin R. DeHavenShawn L. StricklandCraig M. TarverH. Keo Springer, and Matt R. Cowan, "Shock initiation experiments with ignition and growth modeling on the HMX-based explosive LX-14", AIP Conference Proceedings 1979, 100045 (2018) https://doi.org/10.1063/1.5044917
  17. Springer, H.K., Bastea, S., Gambino, J.R., White, B.W., Sullivan, K.T., Towards Developing Mixture Reactive Flow Models For Additively Manufactured Explosives, Proceedings of the JANNAF 41st PEDCS Joint Subcommittee Meeting (2018). 
  18. James GambinoCraig TarverH. Keo SpringerBradley White, and Larry Fried, "Numerical parameter optimization of the ignition and growth model for HMX based plastic bonded explosives", AIP Conference Proceedings 1979, 150015 (2018) https://doi.org/10.1063/1.5044971
  19. Springer, H.K., Bastea, S., Tarver, C.M., Reaugh, J.E., Gresshoff, M., Gee, R.H., Modeling The Effects of Microstructure and Chemical Kinetics on the Short Pulse Shock Initiation Behavior of HMX-Based Explosives, 16th Int. Det. Symp. (2018). 
  20. (Book Chapter) Austin, R.A., Springer, H.K. and Fried, L.E., Grain-scale simulation of shock initiation in composite high explosives. In Energetic Materials (pp. 243-270). Springer, Cham. (2017)
  21. (CoverReynolds, J.G., Hsu, P.C., Hust, G.A., Strout, S.A. and Springer, H.K., Hot Spot Formation in Mock Materials in Impact Sensitivity Testing by Drop Hammer. Propellants, Explosives, Pyrotechnics, 42(11), pp.1303-1308 (2017).
  22. Springer, H.K., Sullivan, K.T., Gambino, J.R., White, B.W., Bastea, S., Reeves, R.V., Gash, A.E., “High explosive additive manufacturing modeling: Overview, gaps, and new frontiers”, JANNAF PEDCS Workshop on Additive Manufacturing of Energetic Systems, (2017).
  23. (CoverReynolds, J.G., Hsu, P.C., Hust, G.A., Strout, S.A., Hoffman, D.M. and Springer, H.K., Effect of Sandpaper and Grain Size on Non-Shock Initiated Reactions in HMX. Propellants, Explosives, Pyrotechnics, 42(10), pp.1191-1202 (2017).
  24. Springer, H.K., Tarver, C.M. and Bastea, S., Effects of high shock pressures and pore morphology on hot spot mechanisms in HMX. In AIP Conference Proceedings (Vol. 1793, No. 1, p. 080002). (2017).
  25. Gambino, J.R., Springer, H.K., White, B.W., Sullivan, K.T. and Gash, A.E.. Numerical Study of Donor-Acceptor Interface Designs in a Double Cylinder Experiment, Proceedings of the JANNAF 40th PEDCS Joint Subcommittee Meeting (2017).
  26. Hsu, P.C., Zhang, M.X., Pagoria, P., Springer, H.K. and Fried, L., Thermal safety characterization and explosion violence of energetic materials. In AIP Conference Proceedings (Vol. 1793, No. 1, p. 040033). AIP Publishing (2017).
  27. Springer, H.K., Tarver, C.M., White, B.W., Reaugh, J.E., Pfeil, M., Neidert, J.B., “Modeling the shock compaction of debris clouds in delayed detonations”, Proceedings of the JANNAF 30th PSHS Joint Subcommittee Meeting (2017).
  28. McClelland, M.A., Glascoe, E.A., Nichols, A.L., Schofield, S.P. and Springer, H.K.. ALE3D simulation of incompressible flow, heat transfer, and chemical decomposition of Comp B in slow cookoff experiments, 15th Int. Det. Symp. (2015)
  29. Springer, H. K., Vandersall, K. S., Tarver, C. M., Souers, P. C.,  “Investigating shock initiation and detonation in powder HMX with reactive mesoscale simulations”, 15th Int. Det. Symp. (2015)
  30. White, B. W., Springer, H. K., May, C. M., “Investigation of the effects of microstructure and binder properties on impact-induced fragmentation in explosives with meso-scale simulations”, 15th Int. Det. Symp. (2015)
  31. Hsu, P.C., Glascoe, E., Fried, L., Springer, H.K. and Maienschein, J.L., Material Property Characterization of Thermally Damaged HMX-Based Formulations, 15th Int. Det. Symp. (2015)
  32. Willey, T.M., Lauderbach, L., Gagliardi, F., van Buuren, T., Glascoe, E.A., Tringe, J.W., Lee, J.R., Springer, H.K. and Ilavsky, J., "Mesoscale evolution of voids and microstructural changes in HMX-based explosives during heating through the β-δ phase transition." Journal of Applied Physics 118, no. 5 (2015): 055901.
  33. Springer, H.K., Souers, P.C., “Empirical-based development of a generalized detonation model for simulations-based sensitivity studies”, Proceedings of the JANNAF 39th PEDCS Joint Subcommittee Meeting (2015).
  34. White, B.W., Springer, H.K. and Reaugh, J.E., Computational studies of the skid test: Evaluation of the non-shock ignition of LX-10 using HERMES. In Journal of Physics: Conference Series (Vol. 500, No. 19, p. 192021). IOP Publishing (2014)
  35. Springer, H. K., Tarver, C. M., Reaugh, J. E., May, C. M., “Investigating short-pulse shock initiation in HMX-based explosives with reactive meso-scale simulations”, J. Phys.: Conf. Ser. 500 052041 (2014).
  36. Tringe, J. W., Glascoe, E. A., McClelland, M. A., Springer, H. K., et al., “Pre-ignition confinement and deflagration violence in LX-10 and PBX 9501”, J. Appl. Phys. 116, 054903 (2014).
  37. Springer, H.K., Tarver, C.M., Stanfield, J.A., Neidert, J.B., Stowe, D.T., Cogar, J., “Shock-to-detonation transition modeling of the US Army burn-to-violent-reaction rocket motor impact experiments with minimum signature propellants”, Proceedings of the JANNAF 28th PSHS Joint Subcommittee Meeting (2014).
  38. Tringe, J.W., Kercher, J.R., Springer, H.K., Glascoe, E.A., Levie, H.W., Hsu, P., Willey, T.M. and Molitoris, J.D., “Numerical and experimental study of thermal explosions in LX-10 and PBX 9501: Influence of thermal damage on deflagration processes”, J. Appl. Phys. 114, 043504 (2013).
  39. Springer, H. K., Glascoe, E. A., Reaugh, J. E., Kercher, J. R., and Maienschein, J. L., “Mesoscale modeling of deflagration-induced deconsolidation in plastic bonded explosives”, AIP Conf. Proc. 1426, 705 (2012).
  40. Hsu, P.C., Hust, G., May, C.M., Howard, W.M., Chidester, S., Springer, H.K. and Maienschein, J.L., "Study of thermal sensitivity and thermal explosion violence of energetic materials in the LLNL ODTX system." In AIP Conference Proceedings, vol. 1426, no. 1, pp. 559-562. AIP, (2012).
  41. Glascoe, E. A., Springer, H. K., Tringe, J. W., Maienschein, J. L., A comparison of deflagration rates, at elevated pressures and temperatures, with thermal explosion results, AIP Conf. Proc. 1426, (2012).
  42. White, B. W., Springer, H. K., Jordan, J. L., Spowart, J. E., Thadhani, N., “Mesoscale simulations of particle reinforced epoxy-based composite”, AIP Conf. Proc. 1426, 175 (2012).
  43. Nikolaev, S., Phillion, D., Springer, H.K., deVries, W., Jiang, M., Pertica, A., Henderson, J., Horsley, M. and Olivier, S., 2012. Brute Force Modeling of the Kessler Syndrome, Proceedings of the 13th Annual AMOS Conference, (2012)
  44. Springer, H.K., Leininger, L.D., Nichols, A.L., Reaugh, J.E., Stanfield, J.A., Neidert, J.B., “Benchmarking ALE3D modeling with US Army burn-to-violent-reaction sub-scale rocket motor impact experiments”, Proceedings of the JANNAF 27th PSHS Joint Subcommittee Meeting (2012).
  45. Sergei Nikolaev, Donald Phillion, H. Keo Springer, Willem deVries, Ming Jiang, Alex Pertica, John Henderson, Matthew Horsley, Scot Olivier, BRUTE FORCE MODELING OF THE KESSLER SYNDROME, Proceedings of the 13th Annual AMOS Conference, (2012)
  46. Glascoe, E. A., Hsu, P. C., Springer, H. K., et al., “The response of the HMX-based material PBXN-9 to thermal insults: Thermal decomposition kinetics and morphological changes”, Thermochimica Acta, 515:1–2, 58 (2011).
  47. Springer, H. K., Willey, T. M., Friedman, G., Vandersall, K. S., Baer, M. R., “Mesoscale modeling of LX-17 under isentropic compression”, 14th Int. Det. Symp. 1137 (2011).
  48. Lowdermilk, W.H., Rubenchik, A.M. and Springer, H.K.,. Feasibility of High-Power Diode Laser Array Surrogate to Support Development of Predictive Laser Lethality Model, DEPS Conference, (2011)
  49. Tringe, J.W., Glascoe, E.A., Kercher, J.R., Willey, T.M., Springer, H.K., Greenwood, D.W., Molitoris, J.D., Smilowitz, L., Henson, B.F. and Maienschein, J.L., Propagation of Reactions in Thermally-damaged PBX-9501. 14th Int. Det. Symp. 1137 (2011).
  50. Kercher, J.R., Stevens, D.E., Springer, H. K., Georgevich, V.P., 2010, A sub-grid, convective burn model of energetic materials based on the Multiphase framework in ALE3D. Proceedings of the JANNAF, 25th PSHS. (2010)
  51. Springer, H. K., Miller, W. O., Levatin, J. L., Pertica, A. J., and Olivier, S. S., Satellite collision modeling with physics-based hydrocodes: Debris generation predictions of the iridium-cosmos collision event, Proceedings of the 11th Annual AMOS Conference, (2010)
  52. Don Phillion, Alex Pertica, Ben Fasenfest, Matt Horsley, Willem de Vries, H. Keo Springer, David Jefferson, Scot Olivier, Keric Hill, Chris Sabol, Large-Scale Simulation of a Process for Cataloguing Small Orbital Debris, Proceedings of the 11th Annual AMOS Conference, (2010)
  53. Tringe, J.W., Molitoris, J.D., Smilowitz, L., Kercher, J.R., Springer, H.K., Henson, B.F., Glascoe, E.A., Greenwood, D.W., Garza, R.G., Wong, B.M. and Batteux, J.D., TIME-SEQUENCED X-RAY OBSERVATION OF A THERMAL EXPLOSION. In AIP Conf Proc, 1195, 424-427, (2009).
  54. P. C. HsuM. R. DeHavenH. K. Springer, and J. L. Maienschein, "THERMAL DAMAGE CHARACTERIZATION OF ENERGETIC MATERIALS", AIP Conference Proceedings 1195, 440-443 (2009) https://doi.org/10.1063/1.3295168
  55. Goto, D. M., R. Becker, T. J. Orzechowski, H. K. Springer, A. J. Sunwoo, and C. K. Syn. "Investigation of the fracture and fragmentation of explosively driven rings and cylinders." International Journal of Impact Engineering 35, no. 12 (2008): 1547-1556.
  56. Leininger, L. D., Springer, H. K., Mace, J., Mas, E., Modeling the shock initiation of PBX-9501 in ALE3D, Proceedings of the MABS Conference, Oslo, Norway. (2008)
  57. A.J. Sunwoo, R. Becker, D.M. Goto, T.J. Orzechowski, H.K. Springer, C.K. Syn, J. Zhou, Adiabatic shear band formation in explosively driven Fe–Ni–Co alloy cylinders, Scripta Materialia, Volume 55, Issue 3 (2006) https://doi.org/10.1016/j.scriptamat.2006.04.010.
  58. H. Keo Springer, Mesoscale Modeling of Spall in a Heterogeneous Two-Phase Material, University of California at Davis, PhD Dissertation

He is the recipient of the NNSA Defense Programs Award as well as multiple LLNL WCI and GS Directorate Awards.