Numerical simulation of the laser-induced formation of shapes from polymer powders is achieved using an extension of a previously developed model of nonisothermal powder sintering. The extended model mimics the Selective Laser Sintering process which is used to produce a multiple layer part via laser irradiation. Model predictions of the physical features and effective thermophysical properties (porosity and thermal conductivity) of the object demonstrate sensitivity to several thermal processing parameters. Predicted values of the effective thermal conductivity and average porosity of the processed item are reported and correlated. [S1087-1357(00)00904-7]
Issue Section:Technical Papers
Keywords:powders, sintering, laser beam applications, thermal conductivity, porosity, numerical analysis, polymers
J. G., and
Rapid Prototyping and Solid Free Form Fabrication,”
ASME J. Manuf. Sci. Eng.,
H. L., and
Model of Selective Laser Sintering of Bishpenol-A Polycarbonate,”
Ind. Eng. Chem. Res.,
J. I., and
Analysis of Capillary-Driven Viscous Flows During the Sintering of Ceramic Powders,”
M. K., and
An Experimental Study and Model Assessment of Polymer Sintering,”
J. Polym. Eng. Sci.,
Observation, Prediction, and Correlation of Geometric Shape Evolution Induced by Non-Isothermal Sintering of Polymer Powder,”
ASME J. Heat Transfer,
C. W., and
An Engineering Model for Laser-Induced Sintering of Polymer Powders,”
ASME J. Manuf. Sci. Eng.,
Whitaker, S., 1977, A Theory of Drying in Porous Media, in Advances in Heat Transfer, J. P. Hartnett, and T. F. Irvine, Jr., eds., Academic Press, New York, pp. 119–203.
Viscous Flow of Crystalline Bodies under the Action of Surface Tension,”
Russ. J. Phys.,
Scherer, G. W., 1992, “Constitutive Models for Viscous Sintering,” Mechanics of Granular Materials and Powder System, M. M. Mehrabadi, ed., ASME MD-Vol. 37, pp. 1–18.
Natural Convection in Thermally Stratified Enclosures with Localized Heating from Below,”
J. Fluid Mech.,
Devereux, D. B., 1993, Design and Development of a Technique for Measuring Radiative Properties of Dielectric Powder, M. S. thesis, University of Texas at Austin, Austin, TX.
Hanamura, K. and Kumada, M., 1996, “Radiant Flash Melting of Micron Polymer-Particles,” Radiative Transfer-I, M. P. Menguc, ed., Begell House, New York, pp. 682–689.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing, Washington, DC.
L. A., and
Lossless Laser Beam Shaping,”
J. Opt. Soc. Am. A,
F. M., and
Gaussian Laser Beam Profile Shaping,”
Gebhart, B., 1993, Heat Conduction and Mass Diffusion, McGraw-Hill, New York.
Bunnell, D. E., 1995, “Fundamentals of Selective Laser Sintering of Metals,” Ph.D. thesis, University of Texas at Austin, Austin, TX.
A Mathematical Model for Gravity-Induced Distortion during Liquid-Phase Sintering,”
Metall. Trans. A,
McAdams, W. H., 1954, Heat Transmission, McGraw-Hill, New York.
Copyright © 2000