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Dissertation
Damage progression during static and fatigue loading in metal matrix composites
Doctor of Philosophy (Ph.D.), Drexel University
1991
DOI:
https://doi.org/10.17918/00000464
Abstract
The primary objective of this research is to gain a rational understanding of the damage initiation and progression in a variety of metal matrix composites (MMC) during both static and fatigue loading. An extensive two prong investigation involving experimental and analytical phases was undertaken in order to characterize damage progression in center-notched MMC. Experimentally, the crack-tip damage growth was studied utilizing several techniques including optical observations, use of the laser interferometric displacement gauge, acoustic emission, and fractography. The effects of heat treatment, constituents and laminate configuration are addressed. In the analytical phase, the mechanics which govern the onset of damage formation in center cracked unidirectional MMC monolayers are predicted. A unique analytical technique to numerically simulate the subsequent damage progression is presented which manifests the individual microfailure mechanisms and their interaction in the evolution of the failure process ahead of an existing crack. Numerical simulations of the failure process was performed in several center-cracked unidirectional monolayered composites. The numerical simulations are correlated with experimental results in terms of the observed failure process, the notched strength and load-COD data. Excellent agreement between the optical observations and the numerical simulation of the failure process was obtained. The numerical simulations captured the salient features observed in the sequential failure process. When correlated with the experimental results, the numerical simulations provided a better insight into the failure process in MMC. The appropriate selection of constituent components in the development of damage tolerant MMC for a particular application can be achieved by using this numerical technique.
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Details
- Title
- Damage progression during static and fatigue loading in metal matrix composites
- Creators
- John G. Bakuckas
- Contributors
- Jonathan Awerbuch (Advisor)Alan Chun Woon Lau (Advisor)Tein-Min Tan (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xxxiv, 772 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Mechanical Engineering (and Mechanics) [Historical]; Drexel University
- Other Identifier
- 991014970322004721