Mechanics of Curved Fiber Bundles in Composites

by David W. Jensen, Brigham Young Univ, Provo, United States,
Suresh P. Pai, Brigham Young Univ, Provo, United States,
Timothy R. Pickenheim, Brigham Young Univ, Provo, United States,
Colleen M. McCarty, Brigham Young Univ, Provo, United States,

Document Type: Proceeding Paper

Part of: Engineering, Construction, and Operations in Space IV


Fiber undulations are inherent to manufacturing processes like braiding and filament-winding, and sometimes occur as defects in other composite structures. This paper summarizes the status of current research on the mechanical behavior of curved graphite fiber bundles embedded in epoxy matrices. The advantages and limitations of the different analytical, experimental and numerical approaches to describe the effects of fiber undulations are critically evaluated. Models developed for predicting the effect on structural behavior of fiber undulations occurring in filament-winding, braiding and flat laminates are reviewed. Findings from the present survey indicate that undulations in fibrous composites, by design or as defects, generally deteriorate inplane stiffness properties, induce couplings, cause stress concentrations, and initiate failure in a loaded advanced composite structure.

Subject Headings: Composite structures | Fabrics | Structural behavior | Structural analysis | Mechanical properties | Material properties | Failure analysis

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