Masters Theses


"The Laser Aided Manufacturing Processes (LAMP) developed at the University of Missouri-Rolla is used to fabricate three dimensional metal and ceramic parts. The part material is supplied in the form of powder in the size of microns and the laser is used to melt the powder onto a substrate. The CAD model is basically converted to a format called STL files where the model is split into numerous triangles. This facilitates the slicing of the CAD model. Toolpath generation software is used to generate the deposition toolpath from the STL file. The laser scans the substrate and deposits the material according to the slices which solidifies and forms the final part near to net shape. The deposition process depends on various process parameters. One of the important parameter is powder flow structure and mass flow rate of the powder. The powder stream structure depends on the nozzle geometry in use. This thesis describes the influence of different nozzle geometry parameters on the powder flow mode. Thus various effects of nozzle parameters are analyzed over here. The different powder flow structures are studied in relation to achieve better efficiency of the process. The important issues addressed are outlined as follows:

a) The analysis of the concentration structures formed by various nozzle geometry settings to relate their influence on the deposition process.

b) The structure of the merging patterns of different powder streams in axial as well as radial directions.

c) The randomization of experiments performed so that the data collected would be statistically valid"--Abstract, page iv.


Liou, Frank W.

Committee Member(s)

Raper, Stephen A.
Hering, Roger H.


Mechanical and Aerospace Engineering

Degree Name

M.S. in Manufacturing Engineering


This research was supported by the National Science Foundation Grant Number DMI- 9871185, the grants from the U.S. Army Aviation and Missile Command (AMCOM) and U.S. Air Force Research Laboratory contract # FA8650-04-C-5704.


University of Missouri--Rolla

Publication Date

Fall 2004

Journal article titles appearing in thesis/dissertation

  • Numerical and experimental analysis of the powder flow streams in the laser aided material deposition process
  • Analysis of the powder flow characteristics for the direct laser deposition process


viii, 30 pages

Note about bibliography

Includes bibliographical references.


© 2004 Yogesh Thakar, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Pulsed laser deposition
Nozzles -- Fluid dynamics

Thesis Number

T 8593

Print OCLC #


Link to Catalog Record

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