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On the prediction of shrinkage defects by thermal criterion functions

Tavakoli, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s00170-014-5995-0
  3. Abstract:
  4. 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
  5. Keywords:
  6. Macroshrinkage defects ; Solidification defects prediction ; Forecasting ; Numerical methods ; Solidification ; Thermoanalysis ; Casting simulations ; Criterion function ; Heat transfer equations ; Niyama criterion ; Numerical results ; Shrinkage defects ; Solidification defects ; Defects
  7. Source: International Journal of Advanced Manufacturing Technology ; Vol. 74, issue. 1-4 , Jun , 2014 , p. 569-579
  8. URL: http://link.springer.com/article/10.1007%2Fs00170-014-5995-0