Characterization of Superplasticity Using Cone-Type Bulge Test

원뿔형 금형을 이용한 초소성 변형 특성 평가

  • 권용남 (한국기계연구원 공정연구부) ;
  • 이승진 (한국기계연구원 공정연구부) ;
  • 이영선 (한국기계연구원 공정연구부) ;
  • 이호성 (한국항공우주연구원 우주발사체기술실) ;
  • 이정환 (한국기계연구원 공정연구부)
  • Published : 2004.10.01

Abstract

Superplastic formability depends on flow parameters such as temperature, strain rate, strain and stress, microstructures. Usually, superplastic properties of materials are characterized with using a uni-axial tension testing. However, superplastic sheet is formed under mutiaxial loading condition in most forming practices. In the present study, superplastic characteristics of A15083 alloys were determined with using both a uni-axial and biaxial bulging tests. Specially, cone-type die was used to achieve constant strain rate under constant pressure condition. Even though constant strain rate under a certain pressure was achieved only approximately, a cone-type bulging test was found to be quite beneficial to get a multiaxial formability of superplastic materials.

Keywords