Finite element modelling of materials under an axisymmetric forward bar extrusion.|nPart I, Flow formulation

การทำแบบจำลองไฟไนต์เอลิเมนต์สำหรับวัสดุภายใต้การอัดขึ้นรูปทรงกระบอกแบบไปข้างหน้าสมมาตรรอบแกน. ส่วนที่ 1, รูปแบบสมการการไหล

Name: Surasak Suranuntchai

Organization : King Mongkut's University of Technology Thonburi. Faculty of Engineering. Department of Tool and Materials Engineering

Name: สุรศักดิ์ สุรนันทชัย

keyword: Finite element method

Abstract: The current research paper, dealing with the application of finite elelement (FE) technique to simulation of bulk forming processeconsists of a series of two parts. An eulerian finite element flow formulation by assuming that materials under deformation behave identically to a viscous incompressible, macroscopically homogeneous and isotropic non-Newtonian fluid has been adopted and presented in the first part of paper. To model the viscoplastic behavior of a material under extrusion process with isothermal condition, the Bingham's model has been chosen to describe the constitutive relation of the material. In the present work, only an axisymmetric case is considered and 2-D solid finite elements are employed to simulate a forward bar extrusion. The boundary friction between the workpiece and tooling parts; i.e., punch, container and die does not take into consideation in the current formulation. In a complete forward bar extrusion process, quality products are usually produced in a fairly steady state as the material flows through the die. To take advantage of investigating the steady state forming part, an Eulerian description has to be employed which sets the coordinate axes fixed in space as a material particle passes through. With this manner, it can also help to reduce the demand of greatly numerical simulation; e.g. re-meshing throughout the process would be inevitable

King Mongkut's University of Technology Thonburi

Address: Bangkok

Email: info.lib@mail.kmutt.ac.th

Created: 2003

Issued: 2008-11-28

Modified: 2552-01-09

บทความ/Article

application/pdf

BibliograpyCitation : KMUTT Research and Development Journal vol. 26, no. 2 (Apr.-Jun. 2003), p. 139-155

CallNumber: 12002598

eng

©copyrights King Mongkut's University of Technology Thonburi

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