Method of manufacturing curved composite structural elements
First Claim
1. A method of manufacturing a curved composite structural element, the method comprising the steps of:
- laying up a 0-degree web ply formed of contiguously joined fiber composite strips onto a web surface of a manufacturing tool, the web surface having the shape of a planar arc as a flat curve, the manufacturing tool also having a first cap surface adjacent the web surface at one side thereof so as to form a first angle at a first corner with the web surface, and the first cap surface having a longitudinal centerline defining an inward or outward curve along which the first corner runs, whereby fibers of the laid up web ply are aligned in a 0-degree direction with a full length of a longitudinal centerline of the planar arc without substantial distortion;
laying up a 0-degree cap ply of fiber composite tape onto the first cap surface to form a splice with an edge of the laid up web ply along the first corner, the laid up cap ply comprising a plurality of tape fibers having 0-degree fiber orientation substantially aligned with the longitudinal centerline of the curved cap surface, and the splice resulting in a continuous, substantially 0-degree ply lying across the web and first cap surfaces;
laying up a diagonal ply comprising a composite material with a plurality of fibers over the continuous ply on the manufacturing tool by initially adhering an edge of the diagonal ply on the first cap surface of the manufacturing tool;
after said adhering, folding the diagonal ply over the first corner and onto the web surface of the manufacturing tool in order to form a first corner in the diagonal ply between the first cap surface and the web surface;
uniformly spreading the folded diagonal ply over the web surface so as to avoid wrinkles in the diagonal ply on the web surface; and
curing the resulting layup of the diagonal and continuous plies after said spreading.
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Abstract
A method of manufacturing curved composite structural elements can include fabricating a web ply in a flat curve over a removable substrate and laying up the ply on a curved web surface of a manufacturing tool. The method also can include laying up a diagonal ply with fibers oriented at +/−45° from the centerline of the web surface. The method further can include cutting a unidirectional composite tape into segments and laying up the tape segments to form a cross ply with a fiber orientation normal to the centerline of the web surface. One or both edges of the diagonal and cross plies may be folded over one or two sides of the manufacturing tool to form one or two flange surfaces. Additionally, a cap ply can be laid up on one or both flange surfaces using composite tape. The structural element layup can then be inspected and any excess composite material can be trimmed away.
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Citations
20 Claims
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1. A method of manufacturing a curved composite structural element, the method comprising the steps of:
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laying up a 0-degree web ply formed of contiguously joined fiber composite strips onto a web surface of a manufacturing tool, the web surface having the shape of a planar arc as a flat curve, the manufacturing tool also having a first cap surface adjacent the web surface at one side thereof so as to form a first angle at a first corner with the web surface, and the first cap surface having a longitudinal centerline defining an inward or outward curve along which the first corner runs, whereby fibers of the laid up web ply are aligned in a 0-degree direction with a full length of a longitudinal centerline of the planar arc without substantial distortion; laying up a 0-degree cap ply of fiber composite tape onto the first cap surface to form a splice with an edge of the laid up web ply along the first corner, the laid up cap ply comprising a plurality of tape fibers having 0-degree fiber orientation substantially aligned with the longitudinal centerline of the curved cap surface, and the splice resulting in a continuous, substantially 0-degree ply lying across the web and first cap surfaces; laying up a diagonal ply comprising a composite material with a plurality of fibers over the continuous ply on the manufacturing tool by initially adhering an edge of the diagonal ply on the first cap surface of the manufacturing tool; after said adhering, folding the diagonal ply over the first corner and onto the web surface of the manufacturing tool in order to form a first corner in the diagonal ply between the first cap surface and the web surface; uniformly spreading the folded diagonal ply over the web surface so as to avoid wrinkles in the diagonal ply on the web surface; and curing the resulting layup of the diagonal and continuous plies after said spreading. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing a curved composite structural element, the method comprising the steps of:
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laying up a 0-degree web ply formed of contiguously joined fiber composite strips onto a web surface of a manufacturing tool, the web surface having the shape of a planar arc as a flat curve, the manufacturing tool also having first and second cap surfaces each adjacent the web surface at opposed sides thereof so as to form first and second angles with the web surface at first and second corners respectively, and the first and second cap surfaces having an inward and outward curve respectively, whereby fibers of the laid up 0-degree web ply are aligned in a 0-degree direction with a full length of a longitudinal centerline of the planar arc without substantial distortion; laying up a 0-degree cap ply of fiber composite tape onto the first or second cap surface to form a splice with an edge of the laid up web ply along the first or second corner respectively, the laid up cap ply comprising a plurality of tape fibers having 0-degree fiber orientation substantially aligned with a longitudinal centerline of the respective cap surface onto which the cap ply is laid UP, and the splice resulting in a continuous, substantially 0-degree ply lying across the web surface and respective cap surface; cutting a composite tape into a plurality of segments, wherein the composite tape includes a plurality of tape fibers having a general tape fiber orientation; laying up a cross ply over the continuous ply by first laying up the plurality of segments on the first cap surface of the manufacturing tool; after said laying up of the cross ply, folding the cross ply over the first corner onto the web surface and then over the second corner onto the second cap surface of the manufacturing tool in order to form a first corner in the cross ply between the web surface and the first cap surface and a second corner in the cross ply between the web surface and the second cap surface wherein the tape fiber orientation of the cross ply substantially forms a right angle with a tangent of the longitudinal centerline of the web surface at all points thereof; and curing the resulting layup of the cross and continuous plies after said folding. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method comprising:
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forming a 0-degree web ply of fiber composite strips by placing the strips to lay contiguously adjoined on a flat surface and in a planar arc, the planar arc being a shape of a curve on the flat surface, so that fibers of the fiber composite strips are aligned in a 0-degree direction with a full length of a longitudinal centerline of the planar arc without substantial distortion; laying up the web ply onto a web surface of a mandrel to have the 0-degree fiber orientation substantially aligned with a full length of a longitudinal centerline of the web surface, the web surface having the shape of a planar arc, and the mandrel further comprising a first curved cap surface bent away from the web surface at a first corner therewith; laying up a 0-degree cap ply of fiber composite tape onto the first cap surface to form a splice with an edge of the laid up web ply along the first corner of the mandrel, the fiber composite tape of the 0-degree cap ply comprising a plurality of tape fibers having 0-degree fiber orientation substantially aligned with a longitudinal centerline of the first cap surface, and the splice resulting in a continuous, substantially 0-degree ply lying across the web surface and the first cap surface; laying up a cross ply over the web surface of the mandrel onto the continuous ply; folding the cross ply over the first corner onto the first cap surface to form a first corner in the cross ply; sealing the resulting layup of continuous and cross plies after said folding within a vacuum bag to remove trapped air; and forming a curved composite structural element by curing the sealed layup. - View Dependent Claims (17, 18, 19, 20)
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Specification