期刊
ACTA MATERIALIA
卷 52, 期 1, 页码 69-80出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2003.08.028
关键词
solid freeform fabrication; dental restoration; laser processing; finite element modeling; thermal and stress analyses; powder melting and solidification
A 3D thermomechanical finite element model including the effect of the powder-to-solid transition has been developed to investigate the transient temperature, transient stresses, residual stresses and warpage of the component made of multiple materials produced using a laser-assisted layer-by-layer fabrication approach. The model encompasses the effects of the temperature- and porosity-dependent thermal conduction and radiation as well as the temperature-dependent natural convection. It is found that changing from the initial solid elements to powder elements results in higher temperature gradients, larger transient and residual stresses, and increased war-page. Mechanisms responsible for these phenomena are discussed based on heat transfer capabilities and constraints resulting from different initial materials. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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