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Thermo-mechanical coupled 3D-FE modeling of heat rotary draw bending for large-diameter thin-walled CP-Ti tube

  • Zhiyong Zhang
  • He YangEmail author
  • Heng Li
  • Zhijun Tao
  • Dan Wang
ORIGINAL ARTICLE

Abstract

The heat rotary draw bending of large-diameter thin-walled (LDTW) commercial pure titanium (CP-Ti) tube is a highly nonlinear thermo-mechanical coupled physical process. Developing a reliable finite element (FE) model for this process is an effective way to investigate the heat loading and the complex bending behaviors. In this study, considering the characteristics of multi-die constraints and local heating, a thermo-mechanical 3D-FE model was established for preheating and heat bending of LDTW CP-Ti tube in terms of both accuracy and efficiency. First, using the static implicit algorithm, a preheating model was developed to predict the temperature distribution of bending tools. In this model, the key issues such as the full-sized geometry modelling, thermal interaction definition, and automatic heating control were solved to increase the simulation accuracy and efficiency. Then, introducing the predictions of preheating model and using the dynamic explicit algorithm, a thermo-mechanical coupled 3D-FE model was established for the heat bending simulation via the geometry modelling simplification, temperature definition of bending tools, realization of non-uniform temperature distribution, etc. Considering the temperature history of bending tools and wall thickness changing of bent tube, the reliability of preheating model and heat bending model was verified by several experiments. The results showed that the maximum relative errors of both predicted temperature and wall thickness changing degree were less than 9 %. Based on the reliable models, the effects of preheating temperature on the temperature distribution of bending tools and wall thickness changing of tube were numerically evaluated. The established model provides the scientific basis for the prediction and control of bending qualities of the heat RDB process, and the modeling method is also of general significance to the other heat-aided forming process.

Keywords

Heat bending CP-Ti tube FE modeling Thermo-mechanical coupled model Temperature effect 

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Copyright information

© Springer-Verlag London 2014

Authors and Affiliations

  • Zhiyong Zhang
    • 1
  • He Yang
    • 1
    Email author
  • Heng Li
    • 1
  • Zhijun Tao
    • 1
  • Dan Wang
    • 1
  1. 1.State Key Laboratory of Solidification Processing, School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China

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