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A coupled finite element-element-free Galerkin method for simulating viscous pressure forming

机译：有限元耦合的Galerkin数值模拟方法

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摘要

Viscous pressure forming (VPF) is a kind of sheet flexible-die forming process which uses a semisolid, flowable and viscous material as the pressure-transmitting medium. Unlike the conventional rigid die punching or hydroforming process, there are strong nonlinear features between the sheet metal and viscous medium in VPF. In this paper, a numerical analysis method for coupling sheet metal deformation and bulk deformation of viscous medium is presented. A static explicit approach based on the Updated Lagrangian (U.L.) formulation is adopted. The elastoplastic deformation of sheet metal is analyzed with finite element method (FEM), and the visco-elastoplastic bulk deformation of viscous medium is analyzed with the element-free Galerkin method (EFGM), which can eliminate mesh distortion unavoidable during the deformation of viscous medium in FEM. The contact and friction between the sheet metal and viscous medium are treated by the penalty function method. An FEM-EFGM program for coupled deformation between sheet metal and viscous medium is developed, called CDSB-FEM-EFGM for short. Several numerical examples of coupled deformation between viscous mediums with different viscosities and sheet metal are presented to demonstrate the effectiveness of the proposed method. Compared the numerical simulation results with experimental measurements, the validity of the CDSB-FEM-EFGM program is obtained.
机译：粘性压力成型（VPF）是一种片状柔性模具成型工艺，它使用半固态，可流动且粘性的材料作为压力传递介质。与传统的刚性冲模或液压成型工艺不同，VPF中的钣金和粘性介质之间存在强烈的非线性特征。本文提出了一种将薄板变形与粘性介质整体变形耦合的数值分析方法。采用基于更新的拉格朗日（U.L.）公式的静态显式方法。用有限元方法（FEM）分析钣金的弹塑性变形，并用无元素Galerkin方法（EFGM）分析粘性介质的粘弹塑性整体变形，可以消除粘滞变形过程中不可避免的网格变形。有限元中的中等。钣金与粘性介质之间的接触和摩擦通过罚函数法进行处理。开发了用于钣金与粘性介质之间的耦合变形的FEM-EFGM程序，简称CDSB-FEM-EFGM。给出了具有不同粘度的粘性介质和金属薄板之间耦合变形的几个数值示例，以证明该方法的有效性。将数值模拟结果与实验测量结果进行比较，得出了CDSB-FEM-EFGM程序的有效性。

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  • 来源
    《Engineering analysis with boundary elements》 |2016年第7期|86-102|共17页
  • 作者

    Binxian Yuan; Wa Fang; Jiguang Li; Yujun Cai; Zhoude Qu; Zhongjin Wang;

  • 作者单位

    Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China;

    Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China;

    Tianjin Long March Launch Vehicle Manufacturing Co. Ltd, Tianjin 300462, China;

    Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China;

    Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Finite element method; Element-free Galerkin method; Coupled deformation; Viscous pressure forming;

    机译：有限元法;无元素Galerkin方法;耦合变形;粘性压力成型;

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