Study of Penetration Technology
Final rept. 1 Jan 1975-29 Sep 1976
FLORIDA UNIV GAINESVILLE DEPT OF ENGINEERING SCIENCES
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A study of the performance characteristics of terradynamic impactors is reported on, including the influence of initial input velocity, impactor nose shape, and different soil conditions in Eglin sand. The investigation also included evaluation of various sensing devices for nonintrusive measurement of vehicle motions during the penetration process. The most useful of the experimental tools were found to be flash X-Ray radiography. Additional devices evaluated were magnetic coils, microwaves, capacitive AND OTHER PRESSURE TRANSDUCERS, STRAIN GAGES ON TEST CHAMBER WALLS, AND BREAKING-WIRE SENSORS. Data analysis was performed by using classical Poncelet predictive techniques, empirical Sandia penetration equations, semi-analytical Cavity Expansion Theory, and a three dimensional code for trajectory analysis developed under this contract for use with an assumed three dimensional force law. To obtain essential input to the aforementioned models, a study of the acoustic wave velocity in a sand medium was made, and results are included in this report.
- Soil Mechanics