Behavior of PMMA Cylinder Under Shock Loading by Pentolite Charges
NAVAL ORDNANCE LAB WHITE OAK MD
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The purpose of the work reported here was to improve procedures used in calibrating the NOL large scale gap test. Some changes are suggested which should improve the streak camera records of shock propagation in the PMMA cylinders. Data reduction has been examined in some detail in order to find a suitable method for differentiating the data. The application of smoothing and differentiation operations to subsets of the data is the most promising method. It can be applied so that subtle trends in the data are not destroyed. When the data contain noise, more severe smoothing can be used. This suppresses the effect of noise on the derivative of the data, which is the shock velocity, U. Because most of the data used in this report contains too much scatter from shot to shot, it has not been possible to demonstrate that the U UX relation differs from a smooth curve. There is a good deal of evidence, however, that the curve is not as simple as has been reported by most observers.
- Test Facilities, Equipment and Methods