Back to results
US 4,274,901 AGranted
Method of making a partial interlaminar separation composite system
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorWolf Elber
Life of this patent
Estimating the term…
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.
Claims3
A method for enhancing interlaminar shear strength for composite laminates comprising:
- providing prepreg resin impregnated fiber tape material having the fibers therein running the length of the tape;
- cutting the prepreg tape into a plurality of desired lengths;
- laying up and stacking the plurality of lengths of tape in layers of the desired dimensions and to a predetermined thickness;
- providing a layer formed by a plurality of thin perforated polyester film strips of essentially the same length and width dimensions as the prepreg tape layers;
- positioning one layer of the perforated film strips between each layer of prepreg tape and curing the stacked tape and film strip assembly into a unitary mass under vacuum, pressure and an elevated temperature of at least 465.degree. K. for at least 60 minutes;
- cooling the cured assembly to a minimum of 400.degree. K. while maintaining the vacuum and pressure and, after releasing the vacuum and pressure, permitting the assembly to cool to room temperature to thereby yield a composite laminate structure having improved physical property characteristics.
3 more elements
Dependencies are inferred from the claim text.