Shock Wave and Detonics Research

PI:  Dr. Jerry Forbes

This is a multi-task program in support of research activities in energetics at NSWCIH. The main research focus is to explore with NSWCIH scientists how electromagnetic fields can change sensitivity and performance of explosives. Additional scientific support was provided by reviewing proposals, scientific papers, attending scientific and program review meetings, mentoring young scientists, and providing training classes in shock and detonation physics.

The modified gap shock sensitivity test is being used to see if electric fields change the sensitivity of HMX compositions with concentrations by mass 92% and 88%. This task is in collaboration with Dr. Richard Lee at NSWCIH. One composition was cast cured and the other pressed. The surface velocities of shocked explosive samples (see figure) were measured with and without electric fields, using a high-speed digital-camera.

Velocity versus input pressure plots give shock sensitivity thresholds for first reaction, deflagration, and detonation. The data showed higher levels of reaction when a modest field was applied for the cast cured explosive.  The data for the pressed explosive displayed too much variance with and without fields applied to determine any effect. As part of the overall research project, three junior scientists were mentored.

A number of specialized education/training exercises in shock wave and detonation physics were conducted. These were:

• A series of lectures on shock wave and detonation physics was provided for summer interns and Post-docs at NSWCIH. A 6-week course on shock wave thermodynamics of condensed matter was also provided to NSWCIH research staff. 
• A three-day workshop was given at ARL on shockwave and detonation physics. The workshop was recognized by ARL via a letter of commendation for its technical breadth and depth.
• Two lectures were given on “Detonation Physics Grand Challenges” at the Research and Engineering Education Facility (REEF) campus of University of Florida.  This campus supports Eglin Air Force Base in energetics research activities.