A STUDY OF THE PENETRATION OF PROJECTILES INTO MARINE SEDIMENTS
The work described in this document consists of three main parts: + Application, after having reviewed calculation methods and known codes, of a dynamic plasticity model based on the upper bound method (with dissipated energy calculations by plastic deformations). The soil model used for this calculation is the Cambridge Clay Model. + Carrying out a programme of tests with instrumented small scale penetrators in centrifuge on a consolidated clay target. The trials are done under 50 g, with projectiles, fired with an airgun at high impact velocity (50 m/s). The penetrators instrumentation consists of either measuring acceleration, or tip force with strain gauges. + The mounting of a small instrumented penetrator for shallow water depth experimentations, with an accelerometer, and a load cell for tip resistance. A rapid electronic data acquisition system has been developed for these experimentations. The preliminary tests are done in a large tank filled with clay. The geotechnical characteristics of the clay are perfectly controlled. The tests performed under these conditions have shown the following observations: the rapid electronic data acquisition system works perfectly and could be used as a basic component for a deep water instrumented penetrator; the results, obtained in these particular test conditions, are in a perfect agreement with the predictions of the model developped in the frame of this contract.
Bibliographic Reference: EUR 9667 FR (1985) FS, 96 P., BFR 350, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123101600 / Last updated on: 1987-01-01
Available languages: fr