Investigation of the plastic hardening of metal thin-walled tube under pulsating hydraulic loading condition
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DOI 10.1007/s12206-020-1031-5
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1031-5 Keywords: · Hydroforming · Metal thin-walled tube · Plastic hardening · Pulsating loading condition
Correspondence to: Guolin Hu [email protected]
Citation: Hu, G., Pan, C. (2020). Investigation of the plastic hardening of metal thin-walled tube under pulsating hydraulic loading condition. Journal of Mechanical Science and Technology 34 (11) (2020) 4743~4751. http://doi.org/10.1007/s12206-020-1031-5
Received November 18th, 2019 Revised
July 29th, 2020
Investigation of the plastic hardening of metal thin-walled tube under pulsating hydraulic loading condition Guolin Hu and Chunrong Pan School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, 86 Hongqi Avenue, Zhanggong District, Ganzhou City, Jiangxi Province, China
Abstract
In the present study, the mechanical model of section element in tube bulging area was established through the stress conditions of hydraulic bulging. Based on the mechanical model, the equivalent stress and equivalent strain equations of the section element in the bulging area were derived, respectively. Combined with the experimental data, the equivalent stress and strain of the section element in the bulging area were fitted by polynomial, and the plastic hardening model of thin-walled tube under pulsating loading was obtained. In order to verify the model precision, the plastic hardening models obtained from pulsating hydroforming and non-pulsating hydroforming were taken as the material model by finite element simulation respectively. The experimental results were compared with the simulation results which showed that as a pulsating hydraulic loading material parameters, the model established in this paper had higher precision.
Accepted August 28th, 2020 † Recommended by Editor Hyung Wook Park
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Tube pulsating hydraulic forming technology is a new research hotspot in recent years, which has been widely concerned by many researchers. It is expected to be a new technology to improve the forming properties of metal thin-walled tubes [1, 2]. The plastic hardening model, as a material property parameter, has a significant influence on the analysis of forming mechanism. Moreover, the accuracy of finite element simulation results is largely dependent on the accurate plastic hardening model. Some researchers obtain plastic hardening models based on simple loading paths using ordinary solution methods, such as unidirectional tensile and compression tests. Zhan et al. [3] investigated the forming mechanism of the welded tubes through a microhardness test. Badiger et al. [4-6] investigated the effect of cutting parameters on tool wear, cutting force and surface roughness in machining of MDN431 alloy. However, due to the different stress states between stretching and hydraulic bulging, the analysis acc
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