Abstract
To study the stress state of TC16 under different cold forming, to avoid the fracture of TC16 titanium alloy during cold forging. Cold compression, cold tension and cold torsion experiments were carried out on it under different stress states. The fracture strain values and stress–strain relationship under different stress triaxial ratios and normalized Lode's angle at different strain rates were obtained through these experiments. The data obtained from these experiments were constructed using Bai's model. Then, based on the physical evolution mechanism of dislocation density and fracture strain, a new set of coupled ductile damage constitutive equations was proposed using the internal state variable modeling method. To simulate the microscopic damage evolution during cold forming of TC16 alloy. The unknown parameters within the unified constitutive equation are calculated by using an evolutionary algorithm optimization method. The experimental results show that there is a small gap between the values obtained by the proposed damage constitutive equation and the values obtained by the experiment, which shows the superiority of the proposed damage constitutive equation. After importing it into DEFORM-3D software through a subroutine, the distribution and evolution of micro-damage of bars with different notch radii during cold drawing are predicted. The finite element simulation further verifies the validity and accuracy of the prediction of the coupled ductile damage constitutive equation.
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This project is funded by the National Natural Science Foundation of China (Grant No. 51805314), Key Technologies Research and Development Program (Grant No. 2018YFB1307900) and Shanghai Association for Science and Technology (Grant No. 16030501200).
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Huo, Y., Yang, W., He, T. et al. A Novel Unified Visco-Plastic Damage Constitutive Model Considering Stress State of TC16 Titanium Alloy during Cold Deformation. J. of Materi Eng and Perform 32, 4522–4540 (2023). https://doi.org/10.1007/s11665-022-07415-x
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DOI: https://doi.org/10.1007/s11665-022-07415-x