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Dissertation
Numerical simulation of thermoelectric phenomena in field activated sintering
Doctor of Philosophy (Ph.D.), Drexel University
Jul 2004
DOI:
https://doi.org/10.17918/etd-407
Abstract
The field activated sintering technique (FAST) is a powder consolidation process that involves the application of pulsed current and pressure. Compared with hot pressing and hot isostatic pressing, FAST is a demonstrated rapid densification process that has the potential to minimize grain growth, which is crucial to achieving excellent mechanical properties. In this study, a coupled thermal-electric-densification framework for the design and optimization of FAST-type processes has been proposed and implemented into a finite element package (ABAQUS). A detailed evaluation of the accuracy of the model has been carried out for electrically conductive and insulating materials. The evaluation, compared with experimental measurements, indicated that the model provided a reasonably accurate prediction of the thermal and electric responses. A discrete finite element method was also developed to determine the effective thermal conductivity in a particulate system with a realistic microstructure. In addition to the usual examination of its dependence on relative density, an anisotropy of conductivity was found as a result of the application of nonisostatic stress. This was confirmed qualitatively by experimental observation. Finally, an exploration of FAST simulation of a complex shape part was attempted.
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Details
- Title
- Numerical simulation of thermoelectric phenomena in field activated sintering
- Creators
- Jing Zhang - DU
- Contributors
- Antonios Zavaliangos (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 407; 991014632075804721