Analytical and numerical approach to prediction of forming limit in tube hydroforming |
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Authors: | Jeong Kim Sang-Woo Kim Woo-Jin Song Beom-Soo Kang |
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Affiliation: | aDepartment of Aerospace Engineering, ERC/NSDM, Pusan National University, Pusan 609-735, Republic of Korea;bMetal Working & Plasticity Group, Korea Institute of Machinery & Materials, Changwon 641-831, Republic of Korea;cERC/NSDM, Pusan National University, Pusan 609-735, Republic of Korea |
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Abstract: | Analytical and numerical analyses of forming limit in tube hydroforming under combined internal pressure and independent axial feeding are discussed in this paper. To predict the initiation of necking, Swift's criterion for diffuse plastic instability is adopted based on Hill's general theory for the uniqueness to the boundary value problem. In addition, in order to predict fracture initiation, Oyane's ductile fracture criterion is introduced and evaluated from the histories of stress and strain calculated by means of finite element analysis. From the comparison with a series of tube bulge tests, the prediction of the bursting failure based on the plastic instability and the ductile fracture criterion demonstrates to be reasonable so that these approaches can be extended to a wide range of practical tube hydroforming processes. |
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Keywords: | Hydroforming Plastic instability Ductile fracture criterion FEM |
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