Accession Number : ADA262366


Title :   Analysis of Hopkinson Bar Pressure Gage


Descriptive Note : Final rept.


Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB


Personal Author(s) : Baylot, James T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262366.pdf


Report Date : Jan 1993


Pagination or Media Count : 69


Abstract : U.S. Army Engineer Waterways Experiment Station (WES) designed Hopkinson pressure bar gages were fielded on the Dilute Explosive Tile (DET) test along with New Mexico Engineering Research Institute (NMERI) designed bar gages and pressure gages manufactured by PCB Piezotronics, Inc. On the Mineral Find 3 (MF3) explosive test, WES bar gages were fielded along with pressure transducers manufactured by Kulite. The peak pressures recorded by the PCB ages were much higher than those recorded by the WES bar gages on the DET test. The peak stresses were higher for the Kulite gages than for the WES bar gages in the MF3 test. In each of these tests, the stresses recorded later in time for the bar gage were higher than those recorded for the other types of gages. The NMERI gages indicated that the pressure time-history had two significant peaks while the WES gages indicated only one significant peak. One-half of the surviving PCB gages agreed with the WES gages, while one-half agreed with the NMERI gages. Analytical and finite element (FE) calculations were performed to assess the response of the bar gages in these tests. The analytical solutions included only the bar and agreed extremely well with comparable FE calculations. These calculations indicated that the primary reason for the low peak stress readings in the bar gages was the lower frequency response capability of the recording system used to record the bar gage data. The calculations also indicated that the presence of water around the bar did not significantly affect the measured peak stress in the bar, and that the drag of the water past the bar did not cause significant forces to be developed in the bar.


Descriptors :   *PRESSURE GAGES , TEST AND EVALUATION , STRESSES , FREQUENCY , PRESSURE TRANSDUCERS , WATER , FINITE ELEMENT ANALYSIS , AIRBURST , OVERPRESSURE , HIGH PRESSURE , NUCLEAR EXPLOSION SIMULATION , EXPLOSION EFFECTS , TIME , WAVE PROPAGATION , INSTRUMENTATION , RECORDING SYSTEMS , RODS , VISCOSITY , GAGES , FREQUENCY RESPONSE , ELASTIC WAVES , UNDERGROUND STRUCTURES


Subject Categories : Test Facilities, Equipment and Methods
      Nuclear Weapons


Distribution Statement : APPROVED FOR PUBLIC RELEASE