Affiliation:
1. Korea Institute of Machinery and Materials
2. Korea Institute of Material Science
3. Sungwoo Hightech
4. Pusan National University
5. Nagoya University
Abstract
Formability of tube in elevated temperature is essential data to design the warm
hydroforming process parameters, such as tube diameter, forming temperature and die geometries.
Since the quantitative data of forming limit can be used to predict the failure on forming process,
formability data available on the FE analysis is one of the very important information for the optimum
design. In this study, the effect of heat treatment conditions and deformation temperature on the
formability was investigated for the warm hydroforming of Al6061 tube. Full annealing and
T6-treatment are applied for the heat treatment of Al6061 tubes. To evaluate the hydroformability,
uni-axial tensile test and bulge test were performed at temperature ranges between room temperature
and 300oC. The measured flow stresses were used as input parameters for the simulation of warm
hydroforming process. The damage value and strain variation during hydroforming are analysed by
FEM. A forming limit based on the ductile fracture criteria has been proposed by combining the
results of experimental and FE analysis for the estimation of formability and optimization of warm
hydroforming process.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
2 articles.
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