Lawrence Livermore National Laboratory

H. Keo Springer

Deputy Group Leader Reaction Dynamics
Materials Science Division

 +1 925-424-6502

Ph.D. Mechanical Engineering
University of California at Davis
M.S. Mechanical Engineering
Georgia Institute of Technology - Atlanta, GA
B.S. Mechanical Engineering
Cal Poly, San Luis Obispo, CA

Research Interests

Keo has conducted research in energetic materials (EM), material mesoscale effects, and fragmentation modeling at LLNL for over 17 years. He currently leads EM modeling and experimental validation efforts for the Joint DoD-DOE Munitions and the DOE Counter-Terrorism Programs. This work helps ensure the safety and surety of US weapon systems, as well as how to assess and reduce the threat posed by improvised weapons. Under his leadership, his team has developed advanced EM models in LLNL's multi-physics hydrocode ALE3D: HERMES (High Explosive Reaction Mechanical Stimulus) model to assess non-shock ignition, deflagration, and DDT (deflagration-to-detonation transition); Mesoscale modeling to understand structure-property relationships in shock initiation, deconsolidative burning, and fragmentation; Multi-Phase Convective Burn Model for thermal explosion violence and DDT; Coupled fluid-thermal-chemical cookoff model for low melting point materials; Generalized detonation model for improvised weapon assessments over a wide range of military, commercial, and homemade explosives. He has previously supported hypervelocity impact debris modeling in DYNA3D for the Missile Defense Agency and for a Strategic Initiative in Space Situational Awareness. He is the recipient of the NNSA Defense Programs Award For Outstanding Support of DoD-DOE Joint Munitions Program and Global Security Directorate Award for his work in MDA Hypervelocity Impact Debris Modeling. Keo enjoys working at LLNL where national security intersects S&T.

Selected Publications

Springer, H. K., Glascoe, E. A., Reaugh, J. E., Kercher, J. R., and Maienschein, J. L., 2011, Mesoscale modeling of deflagration-induced deconsolidation in polymer-bonded explosives: Proceedings of APS Shock Compression of Condensed Matter Conference, Chicago, IL.

Glascoe, E. A., Springer, H. K., Tringe, J. W., and Maienschein, J. L., 2011, A comparison of deflagration rates, at elevated pressures and temperatures, with thermal explosion results: Proceedings of APS Shock Compression of Condensed Matter Conference, Chicago, IL.

White, B. W., Springer, H. K., and Jordan, J. L., 2011, Meso-scale simulations of particle reinforced epoxy-based composite:, Proceedings of APS Shock Compression of Condensed Matter Conference, Chicago, IL.

Glascoe, E. A., Hsu, P. C., Springer, H. K., et al., 2011, The response of the HMX-based material PBXN-9 to thermal insults: Thermal decomposition kinetics and morphological changes, Thermochimica Acta, 515:1–2, 58–66.

Springer, H. K., Willey, T. M., Friedman, G., Vandersall, K. S., and Baer, M. R., 2010, Mesoscale modeling of LX-17 under isentropic compression: Proceedings of the 14th International Detonation Symposium, Coeur d'Alene, ID, April.

Springer, H. K., Miller, W. O., Levatin, J. L., Pertica, A. J., and Olivier, S. S., 2010, Satellite collision modeling with physics-based hydrocodes: debris generation predictions of the iridium-cosmos collision event and other impact events: Proceedings of the 11th Annual Advance Maui Optical and Space Surveillance Technologies Conference, Wailea, HI.

Olivier, S. S., Springer, H. K. et al., 2009, High-Performance Computer Modeling of the Cosmos-Iridium Collision: Proceedings of the AMOS Conference, Kihei, Hawaii.

Tringe, J. W., Molitoris, J. D., Smilowitz, L., Kercher, J. R., and Springer, H. K., 2009, Time-sequenced x-ray observation of a thermal explosion: Proceedings of the APS/SCCM, Nashville, TN.

Springer, H. K., 2009, DoD insensitive munitions and surety, LLNL Report LLNL-TR-412057.

Leininger, L. D., Springer, H. K., Mace, J., Mas, E., 2008, Modeling the shock initiation of PBX-9501 in ALE3D: Proceedings of the MABS Conference, Oslo, Norway.

Springer, H. K., 2008, Micromechanical modeling of spall in a two-phase material: Proceedings of the 14th International Symposium on Plasticity, January 3–8, 2008, Kona, HI.

Springer, H. K., 2007, Direct numerical simulations of dynamic compression tests: Proceedings of the ASME Applied Mechanics and Materials Conference, June 3–7, 2007, Austin, TX.

Springer, H. K., 2007, Physics-based debris cloud modeling and simulation for radar-based hit/kill assessment: Proceedings of the 5th US Missile Defense Conference, March 19–22, 2007, Washington DC.

Levatin, J. L., Springer, H. K., and Moss, W. C., 2006, DFRAG: A DYNA3D fragment postprocessor, LLNL Report UCRL-SM-217992.

Sunwoo, A. J., Springer, H. K., Becker, R. C., Goto, D. M., and Orzechowski, T. J., 2006, Adiabatic shear band formation in explosively driven Fe-Ni-Co alloy cylinders: Scripta Materialia, 55:3, 247–250.

Bilyk, S. R., Springer, H. K., and Faux, D. R., 2005, Hot spot initiation modeling for energetics in a dynamic shear punch test: Proceedings of the JANNAF 40th Combustion Subcommittee, 4th Modeling and Simulation Subcommittee, June 13–17, 2005, Charleston, SC.

Springer, H. K., 2005, Effects of microstructure on ductile fracture at small length-scales: Proceedings of the 11th International Symposium on Plasticity, January 4–8, 2005, Kauai, HI.

Springer, H. K., 2003, Fragmentation modeling of ductile metals with heterogeneous microstructures: Proceedings of the 5th Biennial Tri-Laboratory Engineering Conference, Oct 21–23, 2003, Santa Fe, NM.

Sunwoo, A. J., Springer, H. K., and Georgevich, V., 2003, Detonation wave induced fracture and fragmentation of granulated ceramic materials: Proceedings of the 16th US Army Symposium on Solid Mechanics, May 4–7, Charleston, SC.

Springer, H. K., Meso-scale modeling of spall in a heterogeneous two-phase material: Ph.D. dissertation, UC Davis.

Springer, H. K., 1998, The development and validation of an in vitro model of traumatic brain injury: MS Thesis, Georgia Tech.

Chitre, Y., Springer, H. K., and Cargill, R. S., 1997, Response of neural cells to an acute mechanical deformation: Annals of Biomedical Engineering, 25:1, S–49.

Last update: