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A physically based constitutive model of Ti-6Al-4 V and application in the SPF/DB process for a pyramid lattice sandwich panel

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Abstract

The physically based constitutive modeling, simulation and experimental of a superplastic forming and diffusion bonding (SPF/DB) process were studied for the manufacture of a pyramid lattice Ti-6Al-4 V sandwich panel structure. The high-temperature deformation behaviors of Ti-6Al-4 V were studied using uniaxial tensile tests at various temperatures 860  – 950 °C and strain rates 0.0001 s−1 ~ 0.01 s−1, corresponding microstructures were observed using optical microscope (OM) and Electron Backscattered Diffraction (EBSD). Based on obtained flow behavior and microstructure, a set of physically based constitutive equations of the Ti-6Al-4 V was established and used to simulate the superplastic forming for a pyramid lattice sandwich panel. The thinning ratios, dislocation densities, grain sizes and damage distributions of the sandwich panels were successfully predicted by the finite element (FE) simulation. A pyramid lattice Ti-6Al-4 V alloy sandwich panel with good dimensional accuracy and mechanical properties was manufactured by the SPF/DB process at 920 °C with a gas loading path of 0.0005 MPa/s. The maximum thickness thinning ratio, damage factor and relative grain size at the ribs of the sandwich panel were 26.3%, 6.7% and 0.94, respectively. The established constitutive model aids the FE simulations of SPF/DB manufacture of sandwich panels’ structure enabling both macro- and micro-properties to be synergistically controlled and guides the practical process optimizations.

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Acknowledgements

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China under Grant No. 51805256.

Funding

This research was jointly supported by National Natural Science Foundations of China under Grant No. 51805256.

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Yong Wu, Dipeng Wu, Jia Ma & Minghe Chen

  2. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, China

    Wenchao Xiao

  3. Mechanical Engineering Department, Dalian University of Technology, Dalian, 116024, China

    Kailun Zheng

Authors
  1. Yong Wu
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  2. Dipeng Wu
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Correspondence to Yong Wu.

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Wu, Y., Wu, D., Ma, J. et al. A physically based constitutive model of Ti-6Al-4 V and application in the SPF/DB process for a pyramid lattice sandwich panel. Archiv.Civ.Mech.Eng 21, 106 (2021). https://doi.org/10.1007/s43452-021-00260-0

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  • DOI: https://doi.org/10.1007/s43452-021-00260-0

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