ABOUT
WHO WE ARE
Dominca is a small, entrepreneurial, R&D business. We were established in 1996, in Pasadena, CA. Since 1998, we have been located in Albuquerque, NM, in the foothills of the Sandia Mountains.



MEET THE TEAM
JOSEPH H. KANG
PRINCIPAL ENGINEER & CO-FOUNDER
Mr. Kang is co-founder and principal engineer.  He has three decades of experience in the design and analysis of aircraft components, medical devices, and shock/blast mitigation. He designs and fabricates Dominca’s shock and impact testing equipment, incorporating associated electronics and transducers. He also fabricates prototypes, conducts experiments, and analyzes results.

In addition, Mr. Kang has worked in the military aircraft industry, where his accomplishments included the design of an explosively released fuel tank pylon, structural analysis of critical fuselage regions, and design of a hydraulic shock absorber — all for the F-16.  He has also been involved in the orthopedic industry, where he designed orthopedic implants and surgical instruments.

Mr. Kang received his M.S. in Mechanical Engineering from The University of Michigan (Dynamics & Controls) and from Southern Methodist University (Solid Mechanics).  He received his B.S. in Mechanical Engineering from Case Western Reserve University.

NANCY A. WINFREE
PRINCIPAL ENGINEER & CO-FOUNDER
Dr. Winfree is a co-founder.  She has three decades of experience in engineering, including nearly twenty years in impact dynamics and shock compression of condensed matter, and ten years in blast/shock mitigation technology.  Her expertise includes design and analysis of experiments involving high pressure shock-compression of materials, with a focus on solid mechanics and material behavior.  She has expertise in the continuum modeling of solid-to-solid diffusionless phase-transformations of materials such as shape memory alloys and GeO2 under impact.  Dr. Winfree has developed equations of state models of materials, penetration and impact problems, and of shaped-charge jet formation and penetration.  She developed shock mitigation technology to protect an accelerometer from undesirable frequency inputs, and a blast mitigation jacket to protect soldiers’ lungs.

Dr. Winfree received her Ph.D. in Applied Mechanics from California Institute of Technology; B.S. and M.S. in Mechanical Engineering, and M.S. in Bioengineering, all from The University of Michigan.
PUBLICATIONS
  1. N. A. Winfree, Y. C. Tai, W. H. Hsie, and R. Wu.  “The effects of boundary conditions on implementing the Stoney formula for stress measurements.”  InTransducers ’93: Proceedings of the 7th international conference on solid-state sensors and actuators, Yokohama, Japan, 1993.

  2. J. K. Knowles, N. A. Winfree, and T. J. Ahrens.  “Effects of solid-solid phase changes on impact mechanics.”  In Shock Waves: Proceedings of the 20th International Shock Wave Symposium, pages 1449–1454, Pasadena, CA, 1995.

  3. J. K. Knowles, N. A. Winfree, and T. J. Ahrens.  “Dynamically induced phase transitions and the modeling of comminution in brittle solids.”  Mathematics and Mechanics of Solids, 2:99–116, 1997.

  4. N. A. Winfree.  “Impact-induced phase transformations in elastic solids: a continuum study including numerical simulations for GeO2.  Ph.D. Thesis, California Institute of Technology, 1999.

  5. D. E. Grady and N. A. Winfree.  “Equation-of-state effects in the consequence analysis of high-velocity impact,”  In Proceedings of the International Conference on High Pressure Science and Technology: AIRAPT-17, Honolulu, HI, 1999.

  6. N. A. Winfree, D. E. Grady, D. A. Parsons and D. A. Verner.  “Shaped-charge precursor project, Volume II: Development of a MEVA module for tandem warhead penetration assessment,”  U.S. Air Force Technical Report AFRL-MN-EG-TR-2000-7001, 1999.

  7. N. A. Winfree, D. E. Grady, D. A. Parsons, O. N. Yakaboski, K. B. Milligan, and F. Maestas.  “Supersonic penetration of shaped charge jets into concrete.”  In D. M. Jerome, D. C. Ma, and S.-J. Chang, editors, Structures under Extreme Loading Conditions, Fluid-Structure Interaction, and Structural Mechanics Problems in Reactor Safety - 1999 (The ASME Pressure Vessels and Piping Conference), 1999 Aug 1-5, Boston, MA, USA, volume 394, pages 1–10, 1999.

  8. D .E. Grady, D. A. Parsons and N. A. Winfree.  “Physics-based models and analysis tools for debris formation in meteoroid and orbital debris impact,” Technical report, Applied Research Associates, Inc.  For George C. Marshall Space Flight Center, NASA, 2000.

  9. W. D. Reinhart, L. C. Chhabildas, N. A. Winfree, and D. E. Grady.   “Dynamic properties of tributyl phosphate.”   In M. D. Furnish, L. C. Chhabildas, and R. S. Hixson, editors, Shock Compression of Condensed Matter -1999, pages 1071–1074. American Institute of Physics, 2000.

  10. D. E. Grady and N. A. Winfree.   “A computational model for polyurethane foam.”  In K. P. Staudhammer, L. E. Murr, and M. A. Meyers, editors, Fundamental issues and applications of shock-wave and high-strain rate phenomena, Proceedings of EXPLOMET, pages 485–491, 2000.

  11. D. E. Grady and N. A. Winfree.  “Characterization of impact fragmentation.”   In I. Shigeru, editor, Emerging technologies in fluids, structures, and fluid/structure interactions - 2000 (The ASME Pressure Vessels and Piping Conference), July 23-27, 2000 Seattle, Washington, USA, volume PVP-Vol. 414, pages 327–334, 2000.

  12. D. E. Grady, N. A. Winfree, G. I. Kerley, L. T. Wilson, and L. D. Kuhns.  “Computational modeling and wave propagation in media with inelastic deforming microstructure.”  Journal de Physique IV, 10:Pr9–(15–20), 2000.

  13. W. D. Reinhart, L.C. Chhabildas, D.E. Carroll, T.G. Thornhill and N.A. Winfree.  “Techniques for equation-of-state measurements on a three-stage light-gas gun,”  In Proceedings of the 51st meeting of the Aeroballistic Range Association, 2000.

  14. N. A. Winfree, G. I. Kerley, D. E. Grady, L. C. Chhabildas and W. D. Reinhart.  “Equation of state models for tributyl phosphate and its dissociation products,”  In Ninth Annual AIAA/BMDO Technology Conference and Exhibit, July 17–20, 2000, San Diego, California.

  15. N. A. Winfree and G. I. Kerley.  “Equation of state model for tributyl phosphate.”  In M. D. Furnish, L. C. Chhabildas, and R. S. Hixson, editors,Shock Compression of Condensed Matter – 1999, pages 157-160.  American Institute of Physics, 2000.

  16. N. A. Winfree and J. H. Kang.  “The effects of layered garments on the profile of a blast wave entering the thorax.”  In Proceedings of the 72nd Shock and Vibration Symposium, Nov 2001, San Destin, FL, 2001.

  17. N. A. Winfree and J. H. Kang.  “Predicted transfer function of the Sandia accelerometer mount.”  In Proceedings of the 72nd Shock and Vibration Symposium, Nov 2001, San Destin, FL, 2001.

  18. D. E. Carroll, L. C. Chhabildas, W. D. Reinhart, N. A. Winfree, and G. I. Kerley.  “Computational characterization of three-stage gun flyer plate launch.”  In M. D. Furnish, N. N. Thadhani, and Y. Horie, editors, Shock Compression of Condensed Matter – 2001, pages 307-310.  American Institute of Physics, 2001.

  19. W. W. Chen, Q. Wu, J. H. Kang and N. A. Winfree.  “Compressive superelastic behavior of a NiTi shape memory alloy at strain rates of 0.001–750/s.”International Journal of Solids and Structures, 38:8989–8998, 2001.

  20. L. C. Chhabildas, W. D. Reinhart, D. E. Carroll, N. A. Winfree, G. I. Kerley and T. G. Thornhill.  “Equation of state studies of graphite-epoxy and of glass/rubber/graphite-epoxy composite for engagement velocities to 12 km/s,”  Technical Report SAND2001-1405, Sandia National Laboratories, 2001.

  21. W. D. Reinhart, L. C. Chhabildas, D. E. Carroll, T. G. Thornhill, and N. A. Winfree.  “ Equation of state measurements of materials using a three-stage gun to impact velocities of 11 km/s.”  International Journal of Impact Engineering, 26:625–638, 2001.  Presented at the 7th Hypervelocity Impact Symposium (HVIS), Galveston, Texas, November 6-10, 2000.

  22. L. C. Chhabildas, W. D. Reinhart, D. E. Carroll, N. A. Winfree, G. I. Kerley and T. G. Thornhill.  “Equation of state studies of silica phenolic to 150 GPa using a three-stage launcher to 11 km/s,”  Technical Report SAND2001-1404, Sandia National Laboratories, 2001.

  23. N. A. Winfree, L. C. Chhabildas, D. E. Grady, W. D. Reinhart and G. I. Kerley.  “Equation of state of tributyl phosphate: theory and experiment,” Technical Report SAND2001-3924, Sandia National Laboratories, 2001.

  24. D. E. Grady and N. A. Winfree. “ Impact fragmentation of high-velocity compact projectiles on thin plates: a physical and statistical characterization of fragment debris.“  International Journal of Impact Engineering, 26:249-262, 2001.  Presented at the 7th Hypervelocity Impact Symposium (HVIS), Galveston, Texas, November 6-10, 2000.

  25. W. Chen, F. Lu, and N. Winfree.  “High strain-rate compressive behavior of a rigid polyurethane foam with various densities.”  Experimental Mechanics, 42(1):65-73, Mar2002.

  26. J. H. Kang and N. A. Winfree.  “Shock mitigating technology.”  Technical Report DOM03-03, Dominca. Final report under U. S. Air Force contract F08630–01–C–0003, 2003.

  27. J. H. Kang and N. A. Winfree.  “Blast mitigation jacket for training.”  Technical Report DOM05-02, Dominca. Final report under U. S. Army contract DAMD17–01–C–0008, 2005.

  28. B. Song, W. W. Chen, S. Dou, N. A. Winfree and J. H. Kang.  “Strain-rate Effects on Elastic and Early Cell-collapse Responses of a Polystyrene Foam.”   International Journal of Impact Engineering, 31(5):509–521, 2005.

  29. A. V. Tikhonravov, M .K. Trubetskov, N. A. Winfree and J. H. Kang.  “Low frequency approximation and the choice of optimal elastic parameters for two-layer blast protection gear,”  Numerical Methods and Programming, (ht tp://num-meth.srcc.msu.su/english/index.html) 7:23–35, Jan 2006.

  30. N. A. Winfree and J. H. Kang.  “Resonance prevention of accelerometers using multiple-layer rigid filters.”  In Proceedings of the 79th Shock and Vibration Symposium, Oct 2008, Orlando, FL, 2008.

  31. N. A. Winfree and J. H. Kang, United States Patent, No. 7,706,213, Mechanical Filter for Sensors, April 27, 2010.

  32. N. A. Winfree and J. H. Kang.  “Blast Effects On Body Armor: Study of Material Behavior.”  Final report under U. S. Army contract W911QY-09-C-0191, 2012.

  33. N. A. Winfree and J. H. Kang.  “Method to eliminate unwanted high frequency signals above 2 kHz from accelerometers.”  Technical report to U. S. Naval Surface Warfare Center Carderock, under contract N00167-11-P-0433, Dominca, LLC, 2012.