A prediction of bursting failure in tube hydroforming process based on plastic instability |
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Authors: | Jeong Kim Sang-Woo Kim Hoon-Jae Park Beom-Soo Kang |
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Affiliation: | (1) Department of Aerospace Engineering, Pusan National University, Busan, 609-735, Korea;(2) Manufacturing Process Research Center, Korea Institute of Industrial Technology, Chonan, 330-825, Korea;(3) ERC/NSDM, Pusan National University, Busan, 609-735, Korea |
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Abstract: | Based on plastic instability, an analytical prediction of bursting failure on tube hydroforming processes under combined internal
pressure and independent axial feeding is carried out. Bursting is an irrecoverable phenomenon due to local instability under
excessive tensile stresses. In order to predict the bursting failure, three different classical necking criteria – diffuse
necking criteria for a sheet, and a tube, and a local necking criterion for a sheet – are introduced. The incremental theory
of plasticity for an anisotropic material is adopted and the hydroforming limit, as well as a diagram of bursting failure
with respect to axial feeding and hydraulic pressure are presented. In addition, the influences of material properties such
as anisotropy parameter, strain hardening exponent and strength coefficient on plastic instability and bursting pressure are
investigated. As a result of the above approach, the hydroforming limit with respect to bursting failure is verified with
experimental results. |
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Keywords: | Diffuse necking Hydroforming Local necking Plastic anisotropy Plastic instability Tube bulge |
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