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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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