"The laser additive manufacturing technique of laser deposition allows quick fabrication of fully-dense metallic components directly from Computer Aided Design (CAD) solid models. The applications of laser deposition include rapid prototyping, rapid tooling and part refurbishment. The development of an accurate predictive model for laser deposition is extremely complicated due to the multitude of process parameters and materials properties involved. In this work, a heat transfer and fluid flow model is developed.
In the heat transfer and fluid flow model, the governing equations for solid, liquid and gas phases in the calculation domain have been formulated using the continuum model. The free surface in the melt pool has been tracked by the Volume of Fluid (VOF) method. Surface tension was modeled by taking the Continuum Surface Force (CSF) model combined with a force-balance flow algorithm. Laser-powder interaction was modeled to account for the effects of laser power attenuation and powder temperature rise during the laser metal deposition process. Temperature-dependent thermal-physical material properties were considered in the numerical implementation.
The calculation domain is logically partitioned into smaller cells in 3D space. This makes the numerical implementation consume large amounts of computational resources as each cell is considered at each step of the implementation. This challenge has been addressed through the use of parallel computing by way of message passing interface. Simulations were performed and a comparison between the sequential and parallel implementations was also made"--Abstract, page iv.
Liou, Frank W.
Newkirk, Joseph William
Liu, Xiaoqing Frank
Mechanical and Aerospace Engineering
M.S. in Manufacturing Engineering
- United States. National Aeronautics and Space Administration
- Missouri University of Science and Technology. Material Research Center
- Missouri University of Science and Technology. Manufacturing Engineering program
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Numerical simulation of dilution in laser metal deposition by powder injection
- Application of message passing interface in direct metal deposition
ix, 49 pages
© 2014 Xueyang Chen, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Pulsed laser deposition
Dilution -- Mathematical models
Injection molding of metals
Parallel programming (Computer science)
Electronic OCLC #
Chen, Xueyang, "Modelling of directed energy deposition processes" (2014). Masters Theses. 7259.