2022 年 71 巻 12 号 p. 983-988
GFRP is applied in various fields because of it has excellent characteristics, but there is also a problem that it has low fire resistance. It is necessary to addition particles of flame retardant such as Aluminum hydroxide (Al(OH)3) on matrix resin for apply in fields where nonflammability is required. It is expected that the flame retardant characteristics will be improved by adding many particles and including many small particle sizes. However, the increase in resin viscosity caused by the addition of large amounts of particles is a problem point as a matrix resin of GFRP. Therefore, we focused on suppressing the increase in viscosity due to the use of two-particle diameter particles (2DP) that have both large and small particles. It has been confirmed in various studies that the addition of single particle diameter particles to the matrix resin affects the mechanical properties of GFRP. However, the effect of particles with multiple particle sizes on the mechanical properties of GFRP has not been confirmed. In this study, the effect of the addition of 2DP on the mechanical properties of GFRP was clarified from the viewpoint of the fracture mechanism.