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An Experimental-Numerical Study of Penetration in Constrained Ceramic-Metal Structures Covered by Polymer Layer

Eivazi, Asghar | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42955 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Naghdabadi, Reza; Sohrabpour, Saeed
  7. Abstract:
  8. This thesis has been done in two parts. In part I,a rupture disc wasdesigned. The rupture disc is an important part of a gas gun and is used as a fast response valve whichburst at a predefined pressure. Afterdesign,it has been used instead of an electric valve to increase the maximum velocity that can be achieved by the gas gun. Toavoid fragmentation and to have a better control on rupture pressure,a groove isusuallygraved on the disc. Cross and circumferential grooves werestudied in this thesis. It was found that in most cases the discs with a cross groovewere not fully opened because they have four independent failure paths and these paths should be opened simultaneously. However, having only one failure path, circumferential ones were fully opened and showed so much better performance. The experiments on a 13gr projectile showed that the speed of the projectile can be increased twice by replacement of the electric valve with the rupture disc. For example with the gas pressure of 105bar by use of the electric valve the projectile reached a velocity of 225m/s but in the case of the rupture disc the projectile velocity was 430m/s after the test. In part II, penetration in a new confined ceramictile is studied experimentally and numerically. The tiles are confined with one or two layers of glass-vinyl ester composites. To maintain symmetry conditions of the problem vowen fibers are used. The ballistic limit velocity of the confined ceramic tile with one and two composite layres is obtained about 175 and 178m/s respectievely. So, compared with the unconfined ceramic the ballistic limit velocity of confined ceramic with one layer composite is increased 21% (from 145m/s to 175m/s) and the use of two layers of composite does not have any important advantage over one layer.
  9. Keywords:
  10. Ceramic ; Composite ; Limit Velocity ; Rupture Disk

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