| 摘要 |
A fiber-reinforced plastic joined body is provided, in which a fiber-reinforced molded article (X) containing carbon fibers and a thermoplastic resin and having a joining surface (x), and a thermoplastic resin member (Y) having a joining surface (y) are welded via the joining surface (x) and the joining surface (y) by applying ultrasonic to the fiber-reinforced molded article (X), and in which:
(1) a maximum value of tan ´ by viscoelastic measurement of the fiber-reinforced molded article (X) is less than 70% of a maximum value of tan ´ by viscoelastic measurement of the thermoplastic resin contained in the fiber-reinforced molded article (X) within a range of a glass transition temperature ± 100°C of the thermoplastic resin contained in the fiber-reinforced molded article (X),
(2) at least one of the joining surface (x) and the joining surface (y) has an energy director, and
(3) an application surface of the fiber-reinforced molded article (X) to which ultrasonic sound is applied is smooth. |
