NUMERICAL ANALYSIS OF PLANE STRAIN MULTI-DIRECTIONAL UPSETTING OF PRISMATIC SAMPLES

Nemanja Dačević ； Marko Vilotić ； Mladomir Milutinović ； Luka Sevšek ； Ljiljana Stefanović ； Dragiša Vilotić

《IETI Transactions on Engineering Research and Practice》 6卷2期 (2022/12) Pp. 24-29

https://doi.org/10.6723/TERP.202212_6(2).0004

摘要

The plane strain multi-directional upsetting process, a severe plastic deformation (SPD) method, is used for the production of ultra-fine grained metals. Since the value and distribution of accumulated plastic strain and stress directly influence the microstructure, understanding of stress-strain state during the process is of utmost importance. Today, the finite element method (FEM) is one of the most used tools for stress-strain analysis of metal forming processes. In this paper, effective strain and stress distribution, determined by FEM, throughout six upsetting passes is presented. The material of prismatic samples is high-alloyed austenitic steel X2CrNiMo17-12-2, widely used for medical implants. Material characteristics and necessary boundary conditions are experimentally determined. Simulation results are verified comparing force and dimensional measurements from experiment and simulation.

關鍵字

Finite element method ； plane strain upsetting ； severe plastic deformation