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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Numerical simulation and experimental study on cavity growth in uniaxial tension of superplastic magnesium alloy
YU Yan-dong(于彦东)1,2, ZHANG Kai-feng(张凯锋)1,
ZHENG Hai-rong(郑海荣)1, JIANG Da-ming(蒋大鸣)1

1. School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China;
2. Department of Mechanical Engineering,
Harbin Institute of Science and Technology, Harbin 150080, China

Abstract:The cavity growth was studied in uniaxial tension of superplastic magnesium alloy. An exponentially increasing cavity growth model was introduced into the numerical simulation effectively. A three-dimensional rigid visco-plastic finite element method (FEM) program was developed to predict the variation of radius and volume fraction of cavity. Experimental radius and volume fraction of cavity were determined based on the optical microscope observation and analyses. The values obtained by numerical simulation are perfectly in agreement with experimental results. The results are potentially helpful to designing the optimal processing parameters for superplastic forming of materials and to enhance their subsequent mechanical properties.

 

Key words:  cavity growth; numerical simulation; uniaxial tension; superplastic magnesium alloy

ISSN 1672-7029
CN 43-1423/U

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