Manufacturing Technology 2026, 26(2):239-248 | DOI: 10.21062/mft.2026.021

Finite Element Secondary Development of Constitutive Model for Titanium Alloy Vibration-Assisted Cold Upsetting Forming

Xu Yani ORCID..., Wang Ying ORCID..., Wei Chuhan ORCID..., Lin Kai ORCID..., Shu Xuedao ORCID...
School of Mechanical Engineering and Intelligent Manufacturing, Ningbo University, No. 818 Fenghua Road, Jiangbei District, Ningbo, Zhejiang Province, China

To achieve precise finite element simulation of the vibration-assisted cold heading process of titanium alloys, this study focuses on Ti-45Nb titanium alloy as the research object. A constitutive model for vibration-assisted cold heading is established, incorporating both viscoelastic and viscoplastic deformation. The model is transformed into a programmable incremental form, and the control equations for elastic-viscoplastic deformation are derived. Secondary development is conducted using the VUMAT interface of ABAQUS, and the model is applied in simulation. Multi-condition simulations of Ti-45Nb titanium alloy cold heading are performed, and the results are compared with experimental data. The average relative error is found to be within 5%, verifying the accuracy of the finite element numerical simulation based on the secondary development. The developed constitutive model is used to simulate the cold heading process of Ti-45Nb titanium alloy internal wire joint components. The significant effects of vibration assistance in reducing maximum stress, optimizing stress distribution, and improving material flow are intuitively observed. This study provides technical support for the application of vibration-assisted cold heading technology in the forming of difficult-to-deform materials.

Keywords: Cold upsetting forming, Vibration assistance, VUMAT subroutine, Constitutive model, Finite element simulation
Grants and funding:

The Project is supported by Ningbo "Science and technology innovation Yongjiang 2035" key research and development program(2024Z169)

Received: July 1, 2025; Revised: April 10, 2026; Accepted: April 14, 2026; Prepublished online: April 20, 2026; Published: April 23, 2026  Show citation

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Yani X, Ying W, Chuhan W, Kai L, Xuedao S. Finite Element Secondary Development of Constitutive Model for Titanium Alloy Vibration-Assisted Cold Upsetting Forming. Manufacturing Technology. 2026;26(2):239-248. doi: 10.21062/mft.2026.021.
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