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research-article

Physical Modeling for Selective Laser Sintering (SLS) Process

[+] Author and Article Information
Arash Gobal

Graduate Research Assistant, Department of Mechanical and Aerospace Engineering, University of California, Davis, California 95616
agobal@ucdavis.edu

Bahram Ravani

Professor, Fellow of ASME, Department of Mechanical and Aerospace Engineering, University of California, Davis, California 95616
bravani@ucdavis.edu

1Corresponding author.

ASME doi:10.1115/1.4034473 History: Received February 05, 2016; Revised August 12, 2016

Abstract

The process of Selective Laser Sintering (SLS) involves selective heating and fusion of powdered material using a moving laser beam. Because of its complicated manufacturing process, physical modeling of the transformation from powder to final product in the SLS process is currently a challenge. Existing simulations of transient temperatures during this process are performed either using Finite Element (FE) or Discrete Element (DE) methods which are either inaccurate in representing the Heat Affected Zone (HAZ) or too computationally expensive to be practical in large scale, industrial applications. In this work a new computational model for physical modeling of the transient temperature of the powder bed during the SLS process is developed that combines the FE and the DE methods and accounts for the dynamic changes of particle contact areas in the HAZ. The results show significant improvements in computational efficiency over traditional DE simulations while maintaining the same level of accuracy.

Copyright (c) 2016 by ASME
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