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US 4,229,473 AGranted
Partial interlaminar separation system for composites
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorWolf Elber
Life of this patent
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Abstract
This invention relates to an interlaminar separation system for composites wherein a thin layer of a perforated foil film is interposed between adjacent laminae of a composite formed from prepreg tapes to thereby permit laminae adherence through the perforations and produce a composite structure having improved physical property characteristics.
Claims6
A composite laminate having improved fracture resistance comprising:
- a plurality of prepreg tape segments vertically stacked with controlled fiber orientation in each stacked layer and cured into a composite laminate;
- at least one layer of a thin perforated polyester foil film disposed between two adjacent layers of prepreg tape and wherein the adjacent prepreg tape layers are permanently bonded to each other through the perforations in said polyester foil film when the laminate is cured, said laminae being otherwise essentially unbonded.
Dependencies are inferred from the claim text.