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A significant portion of the cost of composite structures is embedded in manufacturing, inspection, and maintenance. Much of this cost is due to unfamiliarity with the expected behavior of the material. Unlike with metals, for which there is a relative wealth of experimental and process data, the results from testing of composites and in particular, textile composites, often defy intuition. If proper specifications and manufacturing process controls are to be placed such that the costs of achieving those specifications are not prohibitive, it must be understood how sensitive mechanical properties are to these parameters. In this paper, results from a series of tests on 2D triaxial braid composite panels are presented. The focus of these experiments is to determine the sensitivity of strength and fiber volume fraction to a small degree of misalignment (±1 to 5°) in braid angle.
Associate professor, University of Massachusetts—Lowell, Lowell, MA
Undergraduate student, Boston University, Boston, MA
Texas Instruments, Attleboro, MA
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