Downloads & Free Reading Options - Results

A time-resolved impulse gage was developed to provide data to fill the gap between the longest duration stress gages (approximately 5 microsec max.) and the fastest of the recoil gages (approximately 50 microsec min.). The characteristics of the new gage include: impulse range 0.5 to 20 ktaps, risetime 10-15 microsec, read time 300-1500 microsec, accuracy + or - 10%, electrical output 1.32 volt/ktap. The gage was specifically developed to record the pressure-time history of 'tamped' UGT experiments, where metallic vapors produced by rapid energy deposition on a specimen material are not free to expand indefinitely, but are trapped in a gap between the specimen surface and a low Z material through which the radiation has passed. The gage measures both 'prompt' impulse from the initial rapid expansion of the vapors and the 'late-time' impulse from the pressure created within the gap. The gage exhibits good linearity, high electrical output, and a wide dynamic range. Other utilizations of the gage besides UGT experimentation include electron-beam and laser effects studies. (Author)