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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

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Simulation of sheet metal extrusion processes with Arbitrary Lagrangian-Eulerian method
ZHUANG Xin-cun(庄新村), ZHAO Zhen(赵 震), XIANG Hua(向 华), LI Cong-xin(李从心)

National Engineering Research Center of Die and Mold CAD, Shanghai Jiao Tong University, Shanghai 200030, China

Abstract:An Arbitrary Lagrangian-Eulerian(ALE) method was employed to simulate the sheet metal extrusion process, aiming at avoiding mesh distortion and improving the computational accuracy. The method was implemented based on MSC/MARC by using a fractional step method, i.e. a Lagrangian step followed by an Euler step. The Lagrangian step was a pure updated Lagrangian calculation and the Euler step was performed using mesh smoothing and remapping scheme. Due to the extreme distortion of deformation domain, it was almost impossible to complete the whole simulation with only one mesh topology. Therefore, global remeshing combined with the ALE method was used in the simulation work. Based on the numerical model of the process, some deformation features of the sheet metal extrusion process, such as distribution of localized equivalent plastic strain, and shrinkage cavity, were revealed. Furthermore, the differences between conventional extrusion and sheet metal extrusion process were also analyzed.

 

Key words: sheet metal forming; Arbitrary Lagrangian-Eulerian method; extrusion; mesh smoothing; remapping

ISSN 1672-7029
CN 43-1423/U

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