Doctoral Dissertations


Process modeling for solidification microstructure and transient thermal stresses in laser aided DMD process


Suhash Ghosh


"Despite enormous progress in Laser Aided Direct Material Deposition (DMD) process adverse effects of process parameters on variety of properties and microstructure have been reported. De-bonding at substrate-deposition interface and cracking in deposited layers are a few that occur due to excessive stress build-up. Very high heating and cooling rates are inherent to this process. Consequently, the effects of solid state phase transformations cannot be neglected. A complete model that provides a quantitative relationship between process parameters, phase transformation kinetics, solidification parameters, thermal stresses and microstructure is highly desirable. This research deals with four key aspects of laser aided DMD. First, effect of solid state phase transformation on thermal stresses. Second, influence of high cooling rates on solidification microstructure at the scale of primary and secondary dendrite arm spacing. Third, effect of deposition patterns on both thermal stresses and solidification microstructure. And fourth, development of a fully coupled temperature-stress/strain field model"--Abstract, leaf iii.


Choi, Joohyun

Committee Member(s)

Kim, Seungjin
Story, J. Greg
Tsai, Hai-Lung
Chandrashekhara, K.


Mechanical and Aerospace Engineering

Degree Name

Ph. D. in Mechanical Engineering


University of Missouri--Rolla. Department of Mechanical and Aerospace Engineering


University of Missouri--Rolla

Publication Date

Spring 2006


xv, 146 leaves

Note about bibliography

Includes bibliographical references (leaves 139-145).


© 2006 Suhash Ghosh, All rights reserved.

Document Type

Dissertation - Citation

File Type




Library of Congress Subject Headings

Lasers -- Industrial applications
Residual stresses
Thermal stresses

Thesis Number

T 9001

Print OCLC #


Link to Catalog Record

Full-text not available: Request this publication directly from Missouri S&T Library or contact your local library.

This document is currently not available here.

Share My Dissertation If you are the author of this work and would like to grant permission to make it openly accessible to all, please click the button above.