Abstract
The CFRP pipe that attached a semicircle of ψ2.0mm rib internally was made for trial purposes by using the silicone rubber mold. Strength has increased by increase of the number and the number of rolling of ribs. Bend strength of the pipe without the rib of the commercial item is 42.0MPa, that of the pipe that applies the rib that comes to this four by one volume is 80.0MPa, and bend strength has increased by 90%.
