Analysis of Electroplastic Constitutive Equation and Multi-physical Field Coupling of Titanium Alloy

doi:10.3901/JME.2024.09.421

Abstract

Abstract: The electroplastic effect stimulated by pulse current can significantly improve the forming ability of titanium alloys. However, the electroplastic effect is the result of the comprehensive action of “electric-thermal-structural” multi-physical fields, and the construction of an electrically assisted finite element model is of great significance for analyzing the plastic deformation behavior and optimizing the forming process parameters. Conducting electric pulse-assisted stretching experiments on Ti-6Al-4V alloy under different current densities, temperatures, and strain rates. Based on the Johnson-Cook model, a constitutive model considering the thermal and athermal effects is established, with the correlation coefficient R² higher than 0.95 and the average relative error lower than 2%. Based on this model, the finite element method analyzes the physical field in the process of electric pulse-assisted stretching. When the current density is 4.19 A/mm2, the current density increased by 21.96% compared with the initial value as the specimen stretched to necking, which led to an obvious increase in the temperature gradient in the gauge section, and the temperature difference increased from 68.69 ℃ to 95.52 ℃ . Compared with the high-temperature test at the same temperature of 350 ℃, the overall uniformity in the strain field is reduced, and the peak stress is reduced by 49 MPa due to the athermal effect. The stress-strain results predicted by the model show a high fitting accuracy compared to the experimental data. It provides a theoretical method for further study of the electro-assisted forming process and electroplastic effect mechanism.

Key words: titanium alloy, electroplastic effect, electrically assisted constitutive equation, multi-physical field coupling modeling

CLC Number:

TG156

HAN Jianchao, ZHANG Mengfei, WANG Bin, GUO Shenghui, JIA Yi, WANG Tao. Analysis of Electroplastic Constitutive Equation and Multi-physical Field Coupling of Titanium Alloy[J]. Journal of Mechanical Engineering, 2024, 60(9): 421-433.

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