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On the prediction of shrinkage defects by thermal criterion functions

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Abstract

The goal of the present study is to predict the formation of solidification induced defects in castings by thermal criteria functions. In a criterion function method, the heat transfer equation is firstly solved, and then the susceptibility of defect formation at every point in the casting is predicted by computing a local function, criterion function, using results of the thermal analysis. In the first part of the paper, some famous criteria functions, in particular, the Pellini and Niyama criteria, are analyzed and their shortcomings are discussed in details. Then, a new criterion function is suggested to decrease the shape-dependency issue of the former criteria. The feasibility of the new method is studied by comparing numerical results against some archived experimental data.

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Authors and Affiliations

  1. Material Science and Engineering Department, Sharif University of Technology, P.O. Box 11365-9466, Tehran, Iran

    Rouhollah Tavakoli

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  1. Rouhollah Tavakoli
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Correspondence to Rouhollah Tavakoli.

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Tavakoli, R. On the prediction of shrinkage defects by thermal criterion functions. Int J Adv Manuf Technol 74, 569–579 (2014). https://doi.org/10.1007/s00170-014-5995-0

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  • DOI: https://doi.org/10.1007/s00170-014-5995-0

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