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Dissertation
A processing science model for three dimensional braiding
Doctor of Philosophy (Ph.D.), Drexel University
1988
DOI:
https://doi.org/10.17918/00003276
Abstract
A constant search for new materials and material composites characterizes the current research in Materials Sciences. Research in the field of composite materials is especially active. In order to meet the requirements of advanced structural composites, is is necessary to develop reinforcing materials which have high through thickness strength, high damage tolerance, and the ability to be formed in a near net shape manufacturing process. Laminated composites are insufficient to meet these stringent requirements (1-4). It is known that the introduction of through thickness reinforcement will increase the damage resistance of the composite as well as eliminate the delamination potential (5-8), but the precise amount of through thickness reinforcement required to improve these properties is not known. There are many approaches to the introduction of through thickness reinforcement: two of the most common are stitched laminates and formed structural textiles. The area of structual textiles provides a methodology for producing the through thickness reinforcement in a single step. Furthermore, the structural textiles can be formed near to the final shape of the desired composite component (9). Consequently, there is a great deal of interest in the design and the a priori analysis of new fibrous reinforcements and effects of fiber architecture on the mechanical performance of the composite. In particular, the three dimensional braided fabric is the subject of new and exciting research. The processing science basis for three dimensionally braided fabrics is developed and characterized herein. The dimensional properties of the braided fabrics as related to yarn characteristics and machine operations are quantified. The mathematics of braiding is analyzed both in terms of the structural geometry of the fabric and the machine operations employed to fabricate the braided structure. And an algorithmic model has been developed and codified which is capable of generating braiding machine operation instruction sequences to form arbitrary cross-sectionally shaped fabrics. With a model of this type, it is now possible to extend the potentials of braiding. The application of the analytical model to complex shaped structures will characterize the feasibility of braiding these components and result in a better understanding and quantification of the processing involved. This model provides the linkage amongst structural designers, composite manufacturers, and fabric performers.
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Details
- Title
- A processing science model for three dimensional braiding
- Creators
- Christopher Michael Pastore
- Contributors
- Frank K. Ko (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
- xv, 248 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021888936004721