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http://dx.doi.org/10.5228/KSPP.2007.16.6.426

Prediction for Forming Limit of Tube Warm Hydroforming Based on the Ductile Fracture Criteria  

Yi, H.K. (부산대학교 정밀정형 및 금형가공센터)
Moon, Y.H. (부산대학교 정밀정형 및 금형가공센터)
Lee, J.H. (한국기계연구원 소재성형센터)
Lee, Y.S. (한국기계연구원 소재성형센터)
Publication Information
Transactions of Materials Processing / v.16, no.6, 2007 , pp. 426-431 More about this Journal
Abstract
Hydroformability and fracture criteria of FE analysis based on ductile fracture were investigated in warm hydroforming of A16061 tube. To evaluate the hydroformability, uni-axial tensile test and bulge test were performed at room temperature and $200^{\circ}C$. The measured flow stresses were used as input parameters for FE analysis. The damage values were calculated by FE analysis based on ductile fracture criteria at maximum radius of free bulged tubes. Damage values were compared of hexagonal shaped hydroformed parts. As a result, the formability by critical damage value for extruded tube is lower than that of full annealed tube up to 0.5.
Keywords
Warm Hydroforming; Ductile Fracture; Free Bulge Test; Forming Limit;
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