Fiber reinforced plastic structural member

• US 20040213952A1
• Filed: 07/24/2003
• Published: 10/28/2004
• Est. Priority Date: 07/31/2002
• Status: Abandoned Application

• Current Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Original Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Inventors: Sanokawa, Yutaka, Komaki, Hideyuki, Sakamoto, Akio, Takemura, Shinichi
• Application Number:
  US10/625,694
• Publication Number:
  US 20040213952A1
• Time in Patent Office: Days
• US Class Current: 428/105
• CPC Class Codes: B29C 70/34 and shaping or impregnating by compression , i.e. combined with compressing after the lay-up operation
• CPC Class Codes: B32B 2262/101 Glass fibres
• CPC Class Codes: B32B 2262/106 Carbon fibres, e.g. graphite fibres
• CPC Class Codes: B32B 2305/076 Prepregs
• CPC Class Codes: B32B 2305/08 Reinforcements
• CPC Class Codes: B32B 2307/56 Damping, energy absorption
• CPC Class Codes: B32B 2419/00 Buildings or parts thereof walls, panels B32B2607/00
• CPC Class Codes: B32B 5/12 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 Class Codes: Y10T 428/24058 including grain, strips, or filamentary elements in respective layers or components in angular relation
• CPC Class Codes: Y10T 428/24124 Fibers

Abstract

This invention relates to an FRP structural member comprising reinforcing fibers, which comprises carbon fibers (a) having tensile modulus of 400 to 850 GPa, in which the carbon fibers (a) are placed so that the orientation direction of the carbon fibers (a) becomes parallel to the longitudinal direction of the structural member. The FRP structural member has high vibration-damping property and much lower production cost as well as light weight, high rigidity and superior corrosion property.

Claims

1. An FRP structural member comprising reinforcing fibers, which comprises carbon fibers (a) having tensile modulus of 400 to 850 GPa, in which the carbon fibers (a) are placed so that the orientation direction of the carbon fibers (a) becomes parallel to the longitudinal direction of the structural member.

2. The FRP structural member according to claim 1, which further comprises carbon fibers (b) having tensile modulus of 200 to less than 400 GPa, in which the carbon fibers (b) are placed so that the orientation direction of the carbon fibers (b) becomes parallel to the longitudinal direction of the structural member.

3. The FRP structural member according to claim 1, wherein the carbon fibers (a) are placed in the range of not more than 50% of the distance between the surface of the member and a neutral surface in the cross-section surface of the member and in the direction of the neutral surface from the surface of the member.

4. The FRP structural member according to claim 2, wherein the carbon fibers (b) are placed in the range of not more than 50% of the distance between the surface of the member and a neutral surface in the cross-section surface of the member and in the direction of the neutral surface from the surface of the member.

5. The FRP structural member according to claim 1, which further comprises carbon fibers (c) having tensile modulus of 200 to 850 GPa, in which the carbon fibers (c) are placed in the site vertical to the neutral surface in the cross-sectional surface of the member and wherein the orientation direction of the carbon fibers (c) forms an angle of ±

45 degrees relative to the longitudinal direction of the member.

6. The FRP structural member according to claim 2, which further comprises carbon fibers (c) having tensile modulus of 200 to 850 GPa, in which the carbon fibers (c) are placed in the site vertical to the neutral surface in the cross-sectional surface of the member and wherein the orientation direction of the carbon fibers (c) forms an angle of ±

45 degrees relative to the longitudinal direction of the member.

7. The FRP structural member according to claim 6, wherein a total amount of the carbon fibers (a), the carbon fibers (b) and the carbon fibers (c) used is 5 to 25% by mass, based on a total amount of the reinforcing fibers and carbon fibers used in the FRP structural member.