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Numerical simulation in precision castings
Author(s) -
Hamar R.
Publication year - 1987
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1620240115
Subject(s) - foundry , shrinkage , thermal , materials science , alloy , mechanics , heat transfer , finite volume method , fluid dynamics , flow (mathematics) , metallurgy , composite material , thermodynamics , physics
Microporosities often appear during the solidification of foundry pieces. They result from the volume contraction of the alloy during its solidification. Thermal transfers between alloy and mould check the solidification. They are estimated by a finite volume method, including specific calculation of the mould filling‐up, the alloy solidification and the resulting feeding of the mould. The calculation uses a geometrical enmeshment of the whole mould, generating numerous elements of different sizes. From the experimental fluid flow measurement, the mould filling‐up may be described step by step by the computer, as can the initial thermal transfer. Thermal transfers are related to the solidification enthalpic release obtained from quantitative differential thermal analysis. They are also related to the fluid flow induced by solidification shrinkage. Such a calculation leads to the location of the microporosities, from which pressure drops can be estimated during solidification.