Electron Beam Experiments on One-Dimensional Quartz Phenolic Fiber Bundle Material.

摘要

An experimental electron beam study of impulse and stress wave propagation in a one-dimensional quartz phenolic fiber bundle (1DQPFB) material was conducted. The objective of the study was to examine the dependence of measured impulse on effects related to the size of the irradiated area and on the specific experimental techniques empolyed. Area effects of two types were identified;the first is associated with a decrease of beam fluence as a function of radius,and the second is related to the amount of edge restraint applied to the fiber bundles--a purely material-dependent effect. Means were developed for measuring the effects of both phenomena. It was shown that an experimental configuration can be designed which will minimize both effects and will allow meaningful impulse measurements to be made on areas as small as 1sq. cm. Stress wave profiles were recorded for two target orientations using a laser velocity interferometer. A comprehensive parametric study was conducted to determine the effects of window material and to define the effect of stress-averaging through the use of buffer plates. (Author)