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- 저자 : 김태원(T.-W. Kim) (검색결과 79 건)
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김태원(T. W. Kim),서판기(P. K. Seo),오세웅(S. W. Oh),강충길(C. G. Kang) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The rotational barrel type equipment has been designed for the new rheology fabrication process. During the continuous rotation of barrel with a constant temperature, the shear rate is controlled with the rotation speed and rotation time of barrel. The barrel surface can be controlled the temperature by the induction heating and cooling system. Many experiments were widely examined by using this system with controlling the rotation speed and the rotation time. The possibility for the rheoforming process was investigated with microstructural characteristics.
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김준완(Jun W. Kim),김태원(T-W. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
Densification occurs by the inelastic flow of the matrix materials of MMCs during the consolidation processes at high temperatures. The results depend on many process conditions such as applied pressure, temperature and volume fraction of fiber and matrix materials. This is particularly important in titanium matrix composites since materials failure may occur by either the applied conditions or microstructural factors through the processes. A generic model based on micro-mechanical approaches, therefore enabling the evolution of density over time to be predicted has been developed. Increasing temperature or pressure is shown to lead to increasing densification rate but the process-variables should be chosen by the consideration of the consequences of geometrical parameters for the materials. The mode developed is then implemented into finite element software so that practical process simulation has been carried out. Further the experimental investigation of the densification behavior of SiC/Ti-6Al-4V composites using vacuum hot pressing, together with thermo AE analysis has been performed, and the results obtained are compared with the model predictions.
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