Composite structure

Patent metadata

Field	Value
Publication number	US-10994513-B2
Application number	US-201816628292-A
Country	US
Kind code	B2
Filing date	Jul 3, 2018
Priority date	Aug 30, 2017
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A composite structure includes a stepped portion formed by laminating a plurality of plies with end surfaces thereof being shifted from each other. The composite structure includes a body portion which includes a first structure portion where a first ply is laminated on a top layer of the first structure portion, a second structure portion where a second ply is laminated on a top layer of the second structure portion, and the stepped portion disposed between the first structure portion and the second structure portion, the second ply being positioned at a distance from the first ply in a lamination direction, and a first cover ply which includes a covering portion covering the stepped portion, one end portion, and the other end portion and is formed so as to cover only a part of a surface of the first ply or a part of a surface of the second ply.

First claim

The invention claimed is:

1. A composite structure which includes a stepped portion formed by laminating a plurality of plies with end surfaces thereof being shifted from each other, the composite structure comprising:
a body portion which includes a first structure portion where a first ply of the plurality of plies is laminated on a top layer of the first structure portion, a second structure portion where a second ply of the plurality of plies is laminated on a top layer of the second structure portion, and the stepped portion disposed between the first structure portion and the second structure portion, the second ply being different from the first ply and positioned at a distance from the first ply in a lamination direction which is a direction where the plurality of plies are laminated; and
a first cover ply which includes a covering portion, a first end portion, and a second end portion, the first cover ply being formed so as to cover only a part of a surface of the first ply or a part of a surface of the second ply, the covering portion entirely covering the stepped portion, the first end portion extending from a first end part of the covering portion along a direction orthogonal to the lamination direction, the second end portion extending from a second end part of the covering portion along the direction orthogonal to the lamination direction,
wherein the first end portion continuously extends along an entire circumference of the covering portion as viewed from above in the lamination direction.

2. The composite structure according to claim 1 , further comprising a second cover ply arranged between the first ply and the first cover ply in the lamination direction,
wherein the second cover ply includes a covering portion covering the stepped portion, a first end portion, and a second end portion, the first end portion extending from a first end part of the covering portion along the direction orthogonal to the lamination direction, the second end portion extending from a second end part of the covering portion along the direction orthogonal to the lamination direction, and being interposed between two plies of the plurality of plies arranged between the first ply and the second ply in the lamination direction.

3. The composite structure according to claim 1 ,
wherein the first cover ply contains a reinforcement fiber having an orientation direction, and
wherein the orientation direction of the first cover ply intersects with a direction orthogonal to a reference line having the shortest distance between the first structure portion and the second structure portion as viewed from above in the lamination direction.

4. The composite structure according to claim 3 , wherein θ1 is in a range of 45±15° or −45±15°, where θ1 is an angle in the orientation direction of the first cover ply with respect to the reference line as viewed from above in the lamination direction.

5. The composite structure according to claim 3 , wherein θ1 is in a range of 0±15°, where θ1 is an angle in the orientation direction of the first cover ply with respect to the reference line as viewed from above in the lamination direction.

6. The composite structure according to claim 3 , further comprising a second cover ply arranged on a side opposite to the first ply with respect to the first cover ply in the lamination direction.

7. The composite structure according to claim 6 ,
wherein the second cover ply contains the reinforcement fiber having the orientation direction, and
wherein a relation of θ3=−θ1 is satisfied, where θ1 is an angle in the orientation direction of the first cover ply with respect to the reference line, and θ3 is an angle in the orientation direction of the second cover ply with respect to the reference line as viewed from above in the lamination direction.

8. The composite structure according to claim 1 ,
wherein the covering portion of the first cover ply includes:
a first covering portion continuing to the first end portion of the first cover ply and has an obliquity with respect to the first end portion as viewed from a cross-section along the lamination direction; and
a second covering portion continuing to the second end portion of the first cover ply and has an obliquity with respect to the second end portion as viewed from the cross-section along the lamination direction, and
wherein the obliquity of the first covering portion with respect to the first end portion is formed more gently than the obliquity of the second covering portion with respect to the second end portion.

9. The composite structure according to claim 1 , wherein, in the stepped portion, provided that H is a horizontal distance, and V is a vertical distance, a ratio H/V of the horizontal distance to the vertical distance is in a range of 1≤H/V<30.

10. A composite structure which includes a stepped portion formed by laminating a plurality of plies with end surfaces thereof being shifted from each other, the composite structure comprising:
a body portion which includes a first structure portion where a first ply of the plurality of plies is laminated on a top layer of the first structure portion, a second structure portion where a second ply of the plurality of plies is laminated on a top layer of the second structure portion, and the stepped portion disposed between the first structure portion and the second structure portion, the second ply being different from the first ply and positioned at a distance from the first ply in a lamination direction which is a direction where the plurality of plies are laminated; and
a plurality of first cover plies, wherein each first cover ply includes a covering portion covering the stepped portion, a first end portion, and a second end portion,
wherein each first cover ply is formed so as to cover only a part of a surface of the first ply and a part of a surface of the second ply, the first end portion extending from a first end part of the covering portion along a direction orthogonal to the lamination direction, the second end portion extending from a second end part of the covering portion along the direction orthogonal to the lamination direction,
and wherein the plurality of first cover plies are each formed so as to cover only a respective part of the stepped portion as viewed from above in the lamination direction.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Kashiwagi Masahiro
• Nonaka Yoshinori
• Takagi Kiyoka
• Shitani Tooru
• Abe Toshio

Classifications

• B64C1/00 Primary

  Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like · CPC title

• B29C64/147

  using sheet material, e.g. laminated object manufacturing [LOM] or laminating sheet material precut to local cross sections of the 3D object · CPC title

• B32B27/34

  comprising polyamides · CPC title

• B32B27/36

  comprising polyesters · CPC title

• B32B5/12

  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