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Determination of flow stress of thin-walled tube based on digital speckle correlation method for hydroforming applications

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Abstract

The flow stress, used to describe the plastic deformation behavior of thin-walled tube, is one of the most important parameters to ensure reliable finite element simulation in the tube hydroforming process. In this study, a novel approach of on-line measurement based on digital speckle correlation method is put forward to determine flow stress of thin-walled tube. A simple experimental tooling is developed and free-bulged tests are performed for 304 stainless steel and H62 brass alloy tubes. An analytical approach is proposed according to the membrane theory and the force equilibrium equation. The developed method is validated by means of FE simulations. The results indicate that the present method is acceptable to define the flow stress in the tube hydroforming process.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410-083, People’s Republic of China

    Jianwei Liu

  2. Department of Practice Teaching, Guilin University of Electronic Technology, Guilin, 541-004, People’s Republic of China

    Jianwei Liu & Huiping Liang

  3. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, 541-004, People’s Republic of China

    Xinyu Liu

  4. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin, 541-004, People’s Republic of China

    Lianfa Yang

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  1. Jianwei Liu
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  2. Xinyu Liu
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  4. Huiping Liang
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Correspondence to Jianwei Liu.

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Liu, J., Liu, X., Yang, L. et al. Determination of flow stress of thin-walled tube based on digital speckle correlation method for hydroforming applications. Int J Adv Manuf Technol 69, 439–450 (2013). https://doi.org/10.1007/s00170-013-5039-1

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  • DOI: https://doi.org/10.1007/s00170-013-5039-1

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