Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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INFLUENCE OF INCLUSION ON INTERNAL DEFECT IN MULTI-STAGE EXTRUSION

  • Yoshida Y. (Dept. of Materials Processing Engineering, Nagoya University) ;
  • Fukaya Y. (Dept. of Materials Processing Engineering, Nagoya University) ;
  • Yukawa N. (Dept. of Materials Processing Engineering, Nagoya University) ;
  • Ishikawa T. (Dept. of Materials Processing Engineering, Nagoya University) ;
  • Ito K. (Aikoku Alpha Corporation)
  • Published : 2003.10.01
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Abstract

Internal defects such as chevron crack occasionally occur in the process of cold extrusion or cold drawing. It is known that the existence and property of inclusion greatly influences the generation of the internal crack. However, in the plastic working field, research about the effect of the inclusion on the fracture is not theoretically analyzed. This paper describes effects of the physical property of inclusion on the internal fracture generation in the process. Prediction of fracture was evaluated by critical damage value calculated by the equation of Cockcroft & Latham and its change by the inclusion physical property such as size and stiffness was investigated.

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