소성∙가공 (Transactions of Materials Processing)

  • 제18권1호
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  • Pages.26-38
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  • 2009
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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반응고 재료에서 점성을 고려한 고상입자의 거동예측을 위한 수치모사 해석

Dynamic Simulation of Solid Particle Considering Change by Viscosity in Rheology Material

  • 권기영 (부산대학교 하이브리드소재솔루션 협동과정) ;
  • 강충길 (부산대학교 기계공학부)
  • 발행 : 2009.02.01
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초록

It was reported that the semi-solid forming process has many advantages over the conventional forming process, such as a long die life, good mechanical properties and energy savings. It is very important, however, to control liquid segregation to gain mechanical property improvement of materials. During forming process, rheology material has complex characteristics, thixotropic behavior. Also, difference of velocity between solid and liquid in the semi-solid state material makes a liquid segregation and specific stress variation. Therefore, it is difficult for a numerical simulation of the rheology process to be performed. General plastic or fluid dynamic analysis is not suitable for the behavior of rheology material. The behavior and stress of solid particle in the rheology material during forging process is affected by viscosity, temperature and solid fraction. In this study, compression experiments of aluminum alloy were performed under each other tool shape which is rectangle shape(square array), rectangle shape(hexagonal array), and free shape tool. In addition, the dynamics behavior compare with Okano equation to power law model which is viscosity equation.

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참고문헌

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