Composite laminated plate having reduced crossply angle

Patent metadata

Field	Value
Publication number	US-2016009368-A1
Application number	US-201313780382-A
Country	US
Kind code	A1
Filing date	Feb 28, 2013
Priority date	Feb 28, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

A composite laminated plate comprising a first plurality of plies of reinforcing fibers for lengthwise strength with respect to a dominant load direction, and a second plurality of reinforcing fibers oriented at angles ±β with respect to the dominant load direction, where β is between 15 and 35 degrees.

First claim

1 . A composite laminated plate comprising a first plurality of plies of reinforcing fibers for lengthwise strength with respect to a dominant load direction, and a second plurality of reinforcing fibers oriented at angles ±β with respect to the dominant load direction, where β is between 15 and 35 degrees.

2 . The plate of claim 1 , wherein β is about 25 degrees.

3 . The plate of claim 1 , wherein the angles of the β-fibers are blurred.

4 . The plate of claim 1 , wherein the first plurality of plies of reinforcing fibers are oriented at angles ±α with respect to the dominant load direction, where α is between 2 and 12 degrees.

5 . The plate of claim 4 , wherein the angles of the α-fibers are blurred.

6 . The plate of claim 1 , further comprising a third plurality of plies of reinforcing fibers oriented at an angle γ with respect to the dominant load direction, where γ is between 87 and 92 degrees.

7 . The plate of claim 1 , further comprising a matrix, wherein the fibers are embedded in the matrix.

8 . The plate of claim 7 , wherein the matrix is a plastic matrix, and wherein the fibers include carbon fibers embedded in the plastic matrix.

9 . The plate of claim 1 , wherein a greater percentage of fibers is used in the first plurality than the second plurality.

10 . A structure having a dominant load direction, the structure comprising a laminated composite plate including a plurality of plies of α-fibers oriented at angles +α and −α with respect to an x-axis; and a plurality of plies of β-fibers oriented at angles +β and −β with respect to the x-axis, where β is between 15 and 35 degrees, and where α is 0 degrees or between 2 and 12 degrees.

11 . The structure of claim 10 , further comprising a box beam stiffening substructure subject to bending that creates lengthwise forces along the x-axis; wherein the plate is attached to the stiffening substructure.

12 . The structure of claim 10 , further comprising a beam including a web and flange; wherein the plate is attached to the flange as a cap.

13 . A box beam comprising a stiffening substructure; a first laminated plate covering one side of the substructure; and a second laminated plate covering an opposite side of the substructure, each plate including a first plurality of reinforcing fibers oriented at an angle between 15 and 35 degrees with respect to a longitudinal axis of the substructure.

14 . The box beam of claim 13 , wherein each plate further includes a second plurality of reinforcing fibers oriented at an angle between 2 and 12 degrees with respect to the longitudinal axis of the substructure.

15 . The box beam of claim 14 , wherein a greater percentage of fibers is used in the second plurality than the first plurality.

16 . A method of forming a plate having an x-axis, the method comprising forming a ply stack including a first plurality of reinforcing fibers oriented at an angle ±α with respect to the x-axis, and a second plurality of reinforcing fibers oriented at an angle ±β with respect to the x-axis, where β is between 15 and 35 degrees, and α is 0 degrees or between 2 and 12 degrees.

17 . The method of claim 16 , further comprising laying up a third plurality of fibers at an angle of γ with respect to the x-axis, where γ is between 87 and 92 degrees.

18 . The method of claim 16 , further comprising laying up integral stiffeners on the ply stack.

19 . The method of claim 16 , further comprising embedding the fibers in a resin, and curing the ply stack.

20 . The method of claim 19 , further comprising cutting fibers in the cured ply stack.

Assignees

• Boeing Co

Inventors

• Kismarton Max U

Classifications

• B32B2260/046

  Synthetic resin · CPC title

• B32B5/26

  another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)} · CPC title

• B32B5/12 Primary

  characterised by the relative arrangement of fibres or filaments of {different layers, e.g. the fibres or filaments being parallel or perpendicular to each other} · CPC title

• E04C3/29

  built-up from parts of different material, {i.e. composite structures} · CPC title

• B32B2262/106

  Carbon fibres, e.g. graphite fibres · CPC title