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    An experimental study on a pure detonation engine about its reaction in water
    (2006) Yasar, M.; Kadi, I.
    Reaction force developed by the detonation pressure is used in various fields in the world. It is being used under control where advanced technology is needed such as; supersonic or hypersonic planes, rockets, ceramic coating of metals, surface hardening, welding of thin film metals, plastic formation of metals. This experimental study was made to investigate; how much a reaction force by the detonation pressure can be developed in water, which has a higher density than air, whether this reaction force can be used in industry or not, and the usability of this force to propel a detonation apparatus in water. LPG and O 2 gases were used in this experimental study. A specially designed prototype detonation engine was put in a water pool and then gases sent into the engine and ignited. Detonation pressure, detonation velocity and the reaction force were measured during combustion. As a result, the Detonation Engine (DE), which was developed by us, with a 120 mm diameter nozzle and flow rate 1.2 m 3/h for LPG and 4.2 m 3/h for O 2 output that push force was approximately 5000 N. During this measurement, flowing reactant rate was 20 times more volume of DE and 0,001665 m 3 for LPG and 0.0058335 m 3 for O 2,.
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    High velocity forming of aluminum cylindrical cups-experiments and numerical simulations
    (2007) Yasar, M.; Kadi, I.
    A new two stage detonation forming machine was developed and cylindrical aluminum cups were formed by using gas detonation forming technology. The forming process was analyzed with the explicit finite element method with various parameters and ANSYS/LS-DYNA software. Defects of wrinkling and rupture were predicted for some forming conditions. The strain and the thickness distribution results were in good agreement with the experimental results. It was seen that thinning and forming mainly take place during the one fourth of the time. The effects of detonation pressure and blank holding force on the deformation of the work pieces were discussed. The numerical results were compared with those obtained in the experiments.