Orientation of Small Diameter Discontinuous Reinforcements for Structural Composites.
Technical rept. Jun 67-May 69,
OWENS-CORNING FIBERGLAS CORP GRANVILLE OH TECHNICAL CENTER
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The object of the program was to develop a method of orienting small diameter discontinuous fiber so a high percentage of their mechanical properties could be utilized. Electrostatic flocking of fibers followed by brushing was investigated as a method for orienting fibers using glass fibers as a model. Fibers in the range of one-sixteenth inch in length were utilized for most of the work with glass because longer fibers were not free flowing. A conductive coating was developed to make the glass fibers flockable. Graphite fibers were then flocked and made into composites. Fiber lengths from one-sixteenth to one-quarter inch were employed to determine the effect of length on strength. Fiber length in the range between one-sixteenth inch to one-eighth appeared to make the strongest graphite composites. The electrostatic flocking method consists of 1 coating a Mylar carrier tape with a thin layer of resin, 2 flocking chopped fibers on the tape, 3 brushing the fibers over to a parallel orientation, 4 stripping the fiber-resin prepreg from the tape, 5 laying the prepreg into a mold in multiple layers and 6 compacting to produce a composite. Multiple flocking and brushing can be employed to increase the fiber loading. Author
- Laminates and Composite Materials
- Structural Engineering and Building Technology