Study on Hydrostatic Extrusion of Composite Rods

by Lu, Po-Xian

Abstract (Summary)
The object of this study is to explore the deformation pattern of axisymmetric clad materials composed of the single-core and the sleeve during hydrostatic extrusion, and discuss the relations between processing condition factors and extrusion pressure in hydrostatic extrusion of axisymmetric clad materials. In the FEM simulation of composite materials during hydrostatic extrusion, this paper describes a technique that can be used for predicting whether core bursting of composite materials occurs or not. The effect of several extrusion parameters on the damage value of the core is examined: extrusion ratio(R), die semicone angle(£\¢X), bonding friction factor(mi), material strength ratio. By performing FEM simulations and discussing the effect of parameters on distribution of damage value obtained, it is possible to establish a data base for prevention of fracture of the core. The paper has designed and constructed an experimental receiver pressure of hydrostatic apparatus with a maximum working pressure of 7000 kgf/cm2. In experiment, extrusion of Cu-Al composite rods with different of core radius ratio was carried out. It has been found that uniform deformation always occurs under the combination of hard sleeve and soft core and the core layer usually fails due to the tension under the combination of hard core and soft sleeve.
Bibliographical Information:

Advisor:Jin-Zhong Xu; Rong -Shean Lee; Yeong-Maw Hwang

School:National Sun Yat-Sen University

School Location:China - Taiwan

Source Type:Master's Thesis

Keywords:hydrostatic extrusion composite rods fem simulation


Date of Publication:09/05/2001

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