Browse > Article
http://dx.doi.org/10.3795/KSME-A.2002.26.10.1971

Solidification Analysis for Surface Defect Prediction of Rheology Forming Process Considering Flow Phenomena of Liquid and Solid Region  

Seo, Pan-Ki (부산대학교 대학원 정밀기계공학과)
Jung, Young-Jin (부산대학교 대학원 정밀기계공학과)
Kang, Chung-Gil (부산대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.26, no.10, 2002 , pp. 1971-1981 More about this Journal
Abstract
Two-dimensional solidification analysis during rheology forming process of semi-solid aluminum alloy has been studied. Two-phase flow model to investigate the velocity field and temperature distribution is proposed. The proposed mathematical model is applied to the die shape of the two types. To calculate the velocities and temperature fields during rheology forming process, the each governing equations correspondent to the liquid and solid region are adapted. Therefore, each numerical model considering the solid and liquid coexisting region within the semi-solid material have been developed to predict the defects of rheology forming parts. The Arbitrary Boundary Maker And Cell(ABMAC) method is employed to solve the two-Phase flow model of the Navier-Stokes equation. Theoretical model basis of the two-phase flow model is the mixture rule of solid and liquid phases. This approach is based on using the liquid and solid viscosity. The Liquid viscosity is pure liquid state value, however solid viscosity is considered as a function of the shear rate, solid fraction and power law curves.
Keywords
Semi-Solid Materials; Two-Phase Flow; Liquid Segregation; Semi-Solid Forging;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Effect of Gate Shape and Forging Temperature on the Mechanical Properties in the Injection Forging Process Semi-Solid Aluminum Material /
[ Kang, C. G. ] / J. of Materials Processing Technology
2 Barkhudarov, M. R., Bronisz, C. L. and Hirt, C. W., 1996, 'Three-Dimensional Thixotropic Flow Model,' The 4th Int. Conf. on Semi-Solid Processing of Alloys and Composites, pp. 110-114
3 Kang, C. G. and Kim, Y. D., 1997, 'A Finite Element Analysis on the Upsetting Process of Semi-Solid Aluminum Material,' J. of Materials Processing Technology, Vol. 66/1-3, pp. 76-84   DOI   ScienceOn
4 Pitts, H. E., and Atkinson, H. V., 1998, 'Thixforming of 6061 Al Alloy for Automotive Components,' The 5th Int. Conf. on Semi-Solid Processing of Alloys and Composites, pp. 97 - 104
5 Mullins, A. M. and Walker, D. J., 1996, 'Modelling Solid/Fluid Interactions in A Dendritic Semi Solid,' The 4th Int. Conf. on Semi-Solid Processing of Alloys and Composites, pp. 104-109
6 Kang, C. G., Choi, J. S. and Kang, D. W., 1998, 'A Filling Analysis of the Forging Process of Semi-Solid Aluminum Materials Considering Solidification Phenomena,' J. of Materials Processing Technology, Vol. 30, No. 438, pp. 289-302   DOI   ScienceOn
7 Paradies, C. J., Rappaz, M., Imwinkelried, T. and Gabathuler, J. P., 1996, 'Simulation of the Pressure Die Casting of A Thixotropic Aluminum Alloy,' The 4th Int. Conf. on Semi-Solid Processing of Alloys and Composites, pp. 115-119
8 Burgos, G. R. and Alexandrou, A. N., 1998, 'Two-Phase Model of Flow of Semi-Solid Materials,' The 5th Int. Conf. on Semi-Solid Processing of Alloy and Composites, pp. 217-224
9 Modigell, M. and Koke, J., 1998, 'Two-Phase Model for Metal Alloys in the Semi-Solid State,' The 5th Int. Conf. on Semi-Solid Processing of Alloy and Composites, pp. 317-326
10 Koc, M., Vazquez, V., Witulski, T. and Altan, T., 1996, 'Application of the Finite Element Method to Predict Material Flow and Defects in the Semi-Solid Forging of A356 Aluminum Alloys,' J of Materials Processing Technology, Vol. 59, pp. 106-112   DOI   ScienceOn
11 Harlow, F. H. and Welch, E. J., 1965, 'Numerical Calculation of Time-Dependent Viscous Incompressible Flow of Fluid with Free Surface,' The Physics of Fluid, Vol. 8, No. 12, pp. 2182-2189   DOI
12 Kang, C. G. and Yoon, J. H., 1996, 'A Compression Behavior of Semi-Solid Material and Finite Element Analysis Considering Flow of Liquid Phase,' Transaction of The Korean Society of Mechanical Engineers A, Vol. 20, No. 12, pp. 3715-3727   과학기술학회마을
13 Kang, C. G. and Kang, D. W., 1997, 'The Effect of Forging Process of Semi-Solid Aluminum Material on Mechanical Properties,' Transaction of The Korean Society of Mechanical Engineers A, Vol. 21, No.9, pp. 1400-1413   과학기술학회마을
14 Kurz, W. and Fisher, D. J., 1984, Fundamentals of Solidification, Trans Tech Publication
15 Kim, N. S. and Kang, C. G., 2000, 'An Investigation of Flow Characteristics Considering Effect of Viscosity Variation in Thixoforming Process,' J. of Materials Processing Technology, Vol. 103, pp. 237-246   DOI   ScienceOn
16 1990, Metal Handbook, ASM International, 10th Edition, Vol. 2, pp. 2 - 164
17 Jung, H. K. and Kang, C. G., 1999, 'An Induction Heating Process with Coil Design and Solutions Avoiding Coarsening Phenomena of AI-6 Pct Si-3 Pct Cu-0.3 Pct Mg Alloy for Thixoforming,' Metallurgical and Materials Transactions A, Vol. 30, No. 11, pp. 2967-2977   DOI
18 Jung, H. K., Kang, C. G. and Moon, Y. H., 2000, 'Induction Heating of Semi-Solid Billet and Control of Globular Microstructure to Prevent Coarsening Phenomena,' J. of Materials Processing Technology, Vol. 9, No.1, pp. 12 -23   DOI   ScienceOn
19 Garat, M., Blais, S., Pluchon, C. and Loue, W. R., 1998, 'Aluminum Semi-Solid Processing : from the Billet to the Finished Part,' The 5th Int. Conf. on Semi-Solid Processing of Alloys and Composites, pp. xvii-xxxi
20 Kang, C. G., Kang, B. S. and Kim, K. H., 1999, 'The Effect of Strain Rate on Macroscopic Behavior in Compression Forming of Semi-Solid Aluminum Alloy,' J. of Materials Processing Technology, Vol. 88, pp. 159-168   DOI   ScienceOn
21 Ohnaka, I., 1985, 'Introduction of Compute Heat and Solidification Analysis,' MARUZEN, pp. 167-208
22 Kang, C. G., 1998, 'Effect of Gate Shape and Forging Temperature on the Mechanical Properties in the Injection Forging Process Semi-Solid Aluminum Material,' J. of Materials Processing Technology, Vol. 73/1-3, pp. 251-263   DOI   ScienceOn
23 Flemings, M. C., 1991, 'Behavior of Matal Alloys in the Semi-Solid State,' Metallurgical Transaction A, Vol. 22, pp. 957 - 981   DOI