| 摘要 |
<p>PURPOSE:To obtain a carbon fiber-reinforced resin composite material which is excellent in impact resistance characteristic by reinforcing the composite material with carbon fiber wherein specific gravity is a specific value or lower, tensil elastic modulus is a specific value or higher, tensil strength is a specific value or higher, and peel strength at end of plate is a specific value or higher. CONSTITUTION:For carbon fiber composing carbon fiber reinforced resin composite material or prepreg, specific gravity is 1.75 or lower, tensile elastic modulus and tensile strength which are measured by a strand tensile test are respectively 29tf/mm<2> or higher and 500kgf/mm<2>, and peel strength at end of plate measured by a composite test is 22kgf/mm<2> or higher. For carbon fiber of which specific gravity is larger than 1.75, neight reducing effect is small. Further for carbon fiber wherein tensile elastic modulus is under 29tf/mm<2>, and tensile strength is under 500kg/mm<2>, impact resistance is low, and besides thick composite material is necessarily produced in order to develop a specific characteristic. Then, merits by the weight-reduction are decreased. Further, when peel strength at end of plate is under 22kgf/mm<2>, the maximum load is decreased because of ply separation at impact.</p> |
