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Korean Journal of Metals and Materials > Volume 54(11); 2016 > Article
Korean Journal of Metals and Materials 2016;54(11): 831-837. doi: https://doi.org/10.3365/KJMM.2016.54.11.831
Effects of Friction and Anvil Design on Plastic Deformation during the Compression Stage of High-Pressure Torsion
Yuepeng Song1,2,3,*, Miaomiao Chen1,2, Baoyan Xu1,2, Dongsheng Gao2, Jing Guo1,2,3, Lingfeng Xu1,2, Zheng Wang1,2, Hyoung Seop Kim3,*
1Shandong Agricultural University, Mechanical and Electronic Engineering College, Tai’an 271018, China
22Shandong Agricultural University, Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Tai’an, China
33Pohang University of Science and Technology, Department of Materials Science and Engineering, Pohang 37673, Republic of Korea
Correspondence  Hyoung Seop Kim ,Tel: +82-54-279-2150, Email: hskim@postech.ac.kr, uptonsong@163.com
Received: 17 March 2016;  Accepted: 25 May 2016.  Published online: 5 November 2016.
ABSTRACT
Herein, we report the results of our investigation on the effect of friction and anvil design on the heterogeneous plastic-deformation characteristics of copper during the compressive stage of high-pressure torsion (HPT), using the finite element method. The results indicate that the friction and anvil geometry play important roles in the homogeneity of the deformation. These variables affect the heterogeneous level of strain in the HPT compressed disks, as well as the flash in the disk edge region. The heterogeneous plastic deformation of the disks becomes more severe with the increasing depth of the cavity, as anvil angle and friction coefficient increase. However, the homogeneity increases with increases in the wall angle. The length of flash and the area of the dead metal zone increase with the depth of the cavity, while they decrease at a wall angle of 180°.
Keywords: high pressure torsion, copper, deformation, finite element analysis, anvil structure
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