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Tarasankar
DebRoy
Professor of Materials Science and Engineering
115 Steidle Building
814-865-1974
debroy@matse.psu.edu |
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Research
Interests:
• Fusion Welding Processes |
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Areas of Research:
We seek to quantitatively understand heat transfer, fluid flow
and mass transfer during materials processing, particularly welding,
chemical vapor deposition and metals processing. Much of our
work involves numerical calculations of temperatures, velocities
and concentrations using computers. The computed results
provide detailed insight about the process and reveal how the
composition and structure of the processed materials evolve. Our
work focuses on overcoming two major problems of the current
generation of models. First, the model predictions do not always
agree with the experimental results because some process parameters
or materials properties cannot be accurately prescribed. Second,
and more important, these unidirectional models cannot determine
multiple sets of process variables that can lead to a particular
materials or process attribute. Our work shows that the
computational convective heat and mass transfer models when combined
with a genetic algorithm can overcome the aforementioned difficulties. The
reliability of the models can be significantly improved by optimizing
the values of the uncertain input parameters from a limited volume
of experimental data. Furthermore, the procedure can calculate
multiple sets of process variables, each leading to the same
target materials or process attributes by conducting a global
search within a phenomenological framework of the equations of
conservation of mass, momentum and energy. This computational
procedure was applied to gas tungsten arc welding of several
alloys to calculate various sets of welding variables to achieve
a specified weld geometry. Each set of welding parameters
resulted in a specified geometry showing the effectiveness of
the computational procedure. |
Technologies
impacted by research:
Welding and joining; thin
films; manufacture of iron and steel; synthesis of composite
materials
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| Journal
Articles and Publications:
1. T. Hong, T. DebRoy, S. S. Babu, and S. A. David.
2000. “Modeling of Inclusion Growth and Dissolution in the Weld Pool.” Metallurgical
and Materials Transactions 31B:161–169.
2. Z. Yang, J. W. Elmer, J. Wong, and
T. DebRoy. 2000.
“Evolution of Titanium Arc Weldment Macro- and
Microstructures—Modeling and Real Time Mapping of Phases.” Welding
Journal Research Supplement 79(4):97s–112s.
3. M. Pastor,
H. Zhao, and T. DebRoy. 2000. “CW-Nd: YAG
Laser Welding of AM60B Magnesium Alloy.” Journal of Laser
Applications 12(3):91–100.
4. Z. Yang and T. DebRoy. 1999. “Modeling
of Macro-and
Microstructures of Gas-Metal-Arc Welded HSLA-100 Steel.” Metallurgical
and Materials Transactions 30B:483–493.
5. H. Zhao, D. R.
White, and T. DebRoy. 1999. “Current
Issues and Problems in Laser Welding of Automo-tive
Aluminum Alloys.” International Materials Re-views
44(6):238–266.
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