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Analysis of shell cracking in investment casting with laser stereolithography patterns

W.L. Yao (W.L. Yao is Assistant Professor at the National Kaohsiung First University of Science and Technology, Taiwan, Republic of China. Ming C. Leu is State Chair Professor in Manufacturing Productivity, New Jersey Institute of Technology, New Jersey, USA)
Ming C. Leu (Ming C. Leu is on leave at the National Science Foundation (USA) as the Program Director for Manufacturing Machines and Equipment. This work is partially supported by the Multi‐lifecycle Engineering Research Center at New Jersey Institute of Technology and by the National Science Foundation. The coating of ceramic on the test parts was done with the help of Michael Maguire at Sandia National Laboratories. We are also thankful to the Center for Manufacturing Systems and Center for Environmental Engineering and Science at New Jersey Institute of Technology for their help and cooperation)

Rapid Prototyping Journal

ISSN: 1355-2546

Article publication date: 1 March 1999

1394

Abstract

This paper presents a numerical and experimental investigation of ceramic shell cracking during the burnout process in investment casting with internally webbed laser stereolithography patterns. Considered are the cracking temperature of the ceramic shell, the buckling temperature of the web link, and the glass transition temperature of the epoxy resin. Our hypothesis is that shell cracking will occur if the ceramic rupture temperature is lower than the temperature of glass transition and the temperature of web buckling. This hypothesis is validated by a good agreement we obtained between experimental observations and numerical simulations. It is found that the shell cracking and web link buckling are strongly related to the cross‐sectional dimensions and span length of the web structure and the shell thickness, and that shell cracking can be prevented by buckling of the epoxy webbed pattern in early stages of the burnout process.

Keywords

Citation

Yao, W.L. and Leu, M.C. (1999), "Analysis of shell cracking in investment casting with laser stereolithography patterns", Rapid Prototyping Journal, Vol. 5 No. 1, pp. 12-20. https://doi.org/10.1108/13552549910251837

Publisher

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MCB UP Ltd

Copyright © 1999, MCB UP Limited

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