Abstract
A pressure-transducer technique was developed for determining the transient distribution of pressure on a surface caused by the impact of a high-velocity jet. Jet parameters known to be effective in producing ring craters were selected for the study. The average jet velocity was 2100 ft/s (640 m/s) and its approximate diameter was 0.26 in. (0.66 cm). A hardened, small-diameter (0.039 in., 0.099 cm) ‘pressure pin’ was used to transmit the pressure from the impact surface to the pressure transducer. The average pressure was thus found over an area of 0.001192 in.2 (0.007690 cm2) at several locations within the impact area. Results show the greatest pressure to occur at the center of the impact area. These results refute the idea that ring craters are produced by the existence of higher pressures near the jet edge.
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