DEVELOPMENT OF LONG-DURATION EXPLOSIVE LOADING TECHNIQUES AND RESPONSE OF SIMPLE STRUCTURES TO PULSE LOADS
Final rept. 16 Mar 1964-30 Jun 1965
STANFORD RESEARCH INST MENLO PARK CA POULTER LABS
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Described is an experimental technique for providing long-duration pulses which can be applied to a part or all of a simple structure such as a beam, plate or cylinder. The technique employs essentially the familiar shock tube except that the detonation front of a gaseous explosive provides the shock wave. Many pulse shapes can be produced by placing in the tube and against the target, layers of different materials such as styrofoam, polyurethane, and Mylar, and by sending the explosively-induced shock wave through them to the target. The search for pulse shapes was mainly confined to those of the blast type by the generation of other types is equally feasible. Outlines of the theoretical treatments of four problems are given. They concern the responses of 1 a clamped beam to a blast pulse uniformly distributed over a central length, 2 a simply supported circular plate to a blast pulse uniformly distributed over a central circular area, 3 a clamped circular plate to a rectangular pulse uniformly distributed over the whole plate, and 4 a clamped circular plate to a rectangular pulse uniformly distributed over a central circular area. Analytical treatments employ the rigid-plastic theory because of interest in moderately large permanent deformations and relative simplicity of analysis.
- Fluid Mechanics