Other

Hideyuki Ohno

Shinichi Takemura

Yutaka Arai

Tomohiro Nakanishi

Yoshio Soda

Mikio Shima

A tapered hollow shaft made of a fiber reinforced composite material, which comprises: (a) at least one angle layer consisting essentially of polyacrylonitrile-based carbon fibers having a tensile modulus ranging from 200 to 500 GPa and a tensile strength ranging from 4000 to 5600 MPa; (b) at least one straight layer consisting essentially of polyacrylonitrile-based carbon fibers having a tensile modulus ranging from 200 to 460 GPa and a tensile strength ranging from 3500 to 5600 MPa; (c) at least one reinforcing layer consisting essentially of pitch-based carbon fibers or polyacrylonitrile-based carbon fibers each having a compressive breaking strain of 1.7 to 5.0%, a tensile modulus ranging from 5 to 160 GPa, a tensile strength ranging from 500 to 3000 MPa and a density ranging from 1.5 to 1.9 g/cm,with the carbon fibers in the reinforcing layer being oriented to incline at an angle of 0&deg; to &plusmn;5&deg; to the axial direction of the shaft, with the reinforcing layer being arranged at the thinner portion of the shaft to extend from a tip thereof up to at least {fraction (1/20)} and not more than &frac34; of the entire length of the shaft, and with the reinforcing layer being arranged at the outermost portion of the shaft.

Tapered hollow shaft

Disclosed is a plate-like carbon fiber-reinforced composite material comprising carbon fibers, wherein that the carbon fibers have a strain at compressive break of 1.7 to 5%, a tensile elastic modulus of 5 to 160 GPa, and a density of 1.5 to 1.9 g/cm,and further in that the composite comprising said carbon fibers cause no delamination by an impact energy of less than 1.4 J/mm in the test of compression after impact in accordance with JIS K 7089.

Fiber-reinforced composite materials

Method for producing carbon fiber, carbon fiber, prepreg, and molded article from fiber-reinforced composite material

Growing community of inventors

Tokyo, Japan

Hideyuki Ohno