Accession Number : ADA142210


Title :   Development of a Distributed Breach for the Conical Shock Tube.


Descriptive Note : Final rept.,


Corporate Author : UNIVERSITY OF CENTRAL FLORIDA ORLANDO ENGINEERING AND INDUSTRIAL EXPERIMENT STATION


Personal Author(s) : Metwalli,S M ; Moslehy,F A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a142210.pdf


Report Date : Jan 1983


Pagination or Media Count : 102


Abstract : This report represents the final stage of distributed breach development for the conical shock tube. An initial design of the distributed breach has been used to find the effect of prestressing before firing on the stress state after firing. Finite element method has been used to evaluate in-plane and hoop stresses before and after firing. A coarse finite element model is used to find points of high stresses before a finer mesh thereat is adopted. Results confirm the existence of a prestress three dimensional continuum which creates a very high resistance to firing loads. In fact, stresses have literally been improved after firing due to prestressing effect. The results of the initial design led to modifications which an further improve the stress distribution in the breach. The improved design with its working drawing is included in the redesign section of this report. The next stage is the manufacturing and testing of the improved design. This will be included in this final report of the project. Test results indicate a marked improvement over the old tube. No failure has occurred and the efficiency of simulating real blasts is about 90% which is much higher than the old tube. (Author)


Descriptors :   *STRESS ANALYSIS , *SHOCK TUBES , PLASTIC DEFORMATION , FINITE ELEMENT ANALYSIS , SHOCK WAVES , COMPUTER APPLICATIONS , UNDERWATER EXPLOSIONS , DETONATIONS


Subject Categories : Test Facilities, Equipment and Methods
      Explosions
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE