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Dissertation
Modeling for mechanical behavior of thin films
Doctor of Philosophy (Ph.D.), Drexel University
1998
DOI:
https://doi.org/10.17918/00007446
Abstract
Two integrated computational-experimental methods capable of characterizing nonlinear stress-strain behavior of thin films or coatings are presented. The first method combines Finite Element simulation with Micro-Plane-Strain Compression experimental data for automotive paints (FE-MPSC) to self-consistently characterize the deformation resistance of thin films. A microscopic plane-strain compression apparatus constructed in DuPont Marshall R & D Laboratory by micro-fabrication technology was used to measure the force-displacement relationship of the thin film. Starting with an initial approximation of stress-strain curve assuming a uniform deformation field in the film, the correct stress-strain relationship of the film corresponding to the actual deformation field can be determined by iterative updating in the finite-element simulation. This method can circumvent the over-estimation of uniaxial stress-strain curve based on traditional methods which assume uniform deformation, uniform contact stress profile and ignore the effect of hydrostatic pressure. The second method, similarly, combines Finite Element simulation with Continuous Spherical Indentation experimental data (FE-CSI) to self-consistently characterize the deformation resistance of thin films. FE-CSI method has been applied to both macro-spherical indentation of SAE4340 steel disk and micro-spherical indentation of silicon thin film. Germane features are discussed, concluding remarks are drawn, and future research works are recommended.
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Details
- Title
- Modeling for mechanical behavior of thin films
- Creators
- Fuzhang Zhao
- Contributors
- Alan Chun Woon Lau (Advisor) - Drexel University, Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- x, 146 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021888820604721