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Analysis and Optimization of a Two-stage Light Gas Launcher for Shock Consolidation Process

Mohammadi, Mohsen | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48934 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arghavani Hadi, Jamal
  7. Abstract:
  8. Powder metallurgy is one of the most important and most usable methods in industries. Nowadays, many of the specimens are made this way. In this method, after powder compaction stage, because of sintering in high temperature, crystallographical structure of the material changes. This change results in poorer strength than initial powde. In order to avoid change and decrease in powder strength, shock consolidation is used. In this research, because of complication of this phenomenon and final quality of the specimen, shock consolidation of metal powders is investigated and analysed. This phenomenon is modeled, simulated, analysed and optimized mathematically.Various methods are used to create shock waves in solids. Dominant method in generating shock waves in powder parts is to use gas launcher. This apparatus working process is complicated. To this end, analysis of this test apparatus is very important. The most important parameter in using gas guns is projectile velocity. Always capability of the launcher is desired to be as high as possible. However, in acceleration of projectile by gas launcher, high pressure is applied on projectile which can cause damage to the projectile. So, minimization of maximum projectile base pressure is vital. Operation of the launcher is depending on many parameters. In order to generate suitable and precise shock waves, the launcher should modeled and analysed to show what is the best input parameters for desired results. So, analysis of the launcher is very important. In this research, operation of two stage light gas launcher is investigate to reach maximum velocity and minimum damage to the projectile. Two objective optimization is used to minimize projectile base pressure and maximize projectile velocity. For optimum use of the launcher, a table is obtained which is used to set proper input parameters for reaching a specific projectile mass to the desired velocity.
  9. Keywords:
  10. Optimal Design ; Two Stage Light Gas ; Shock Consolidation ; Shock Forming ; Mathematical Simulation

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