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Computation of casting solidification feed-paths using gradient vector method with various boundary conditions

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Title Computation of casting solidification feed-paths using gradient vector method with various boundary conditions
 
Creator SUTARIA, M
RAVI, B
 
Subject Feed-path
Gradient vector
Hot-spot
Interfacial heat flux
Shrinkage
Solidification
INTERFACIAL HEAT-TRANSFER
ALUMINUM-ALLOY CASTINGS
LEVEL-SET-METHOD
UNIDIRECTIONAL SOLIDIFICATION
MATHEMATICAL-MODEL
DISTANCE RULES
PHASE-CHANGE
SIMULATION
METALS
DESIGN
 
Description In the present work, a computationally efficient numerical approach called gradient vector method (GVM) is proposed to visualise feed-paths and to evaluate the design of feeding systems with various thermal boundary conditions. It involves the computation of liquid-solid interfacial heat flux vector using an analytically derived solution to phase change-heat transport equation. The resultant of flux vectors gives the direction of the highest temperature gradient, which is continuously tracked to generate complete feed-paths. The originating points of the feed-paths indicate hot-spots that manifest as shrinkage defects. Mathematical models are proposed to handle the effect of various boundary conditions like insulation or exothermic sleeves around feeders and chill blocks in mould. The accuracy of GVM in predicting the location of shrinkage porosity defect has been validated by pouring and sectioning benchmark castings. Computation of feed-paths using this method was found to be an order of magnitude faster than level-set method for casting solidification simulation. The implementation of the method in three dimensions and its application to an industrial casting are also presented.
 
Publisher SPRINGER LONDON LTD
 
Date 2014-12-28T11:50:29Z
2014-12-28T11:50:29Z
2014
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 75(1/4)209-223
0268-3768
1433-3015
http://dx.doi.org/10.1007/s00170-014-6049-3
http://dspace.library.iitb.ac.in/jspui/handle/100/16403
 
Language English