CARBON FIBER BUNDLE, MANUFACTURING METHOD THEREFOR, PREPEG, AND CARBON-FIBER-REINFORCED COMPOSITE MATERIAL

摘要

Disclosed is a carbon fiber bundle wherein a relationship among a crystallite size Lc (nm), a single-fiber compressive strength Fc (GPa) measured by a compressive fragmentation method of single-fiber composites, and an initial modulus E0 (GPa) in a resin-impregnated strand tensile test simultaneously satisfies the following formulas (1) to (3), and Lc is 4.00 nm or less. Fc≥1.3×10/Lc−0.3E0≤80×Lc+155E0≥330The present invention provides a carbon fiber bundle having excellent tensile modulus and compressive strength of a carbon fiber-reinforced composite material, and a manufacturing method therefor.