Patent ID: 8056935

Claim:
An interface between a pipe shaped stiff piece ( 1 ) and a composite material ( 2 ), said composite material ( 2 ) comprising fibers ( 3 ) in a fixing matrix material ( 7 ), characterized by, said stiff piece ( 1 ) comprising two or more axially orientated vanes ( 4 a , 4 b ) protruding from a surface of said stiff piece ( 1 ), said vanes ( 4 a , 4 b ) have a generally rhomboid geometrical shape, each said vanes ( 4 a , 4 b ) comprising two or more lateral surfaces ( 41 , 42 , 43 , 44 ) forming symmetrical positive and negative angles (Â±Î¸) relative to an axis of said stiff piece ( 1 ) in which two or more fibers ( 3 ) of said composite material ( 2 ) are arranged for passing under opposite positive and negative ply angles through one or more funnel-shaped throats ( 45 ) formed between lateral surfaces ( 41 a , 43 a , 41 b , 43 b ) of adjacent vanes ( 4 a , 4 b ), in which said fixing matrix material ( 7 ) is arranged and cured around said fibers ( 3 ), at least in or near said funnel-shaped throats ( 45 ), in which said vanes ( 4 ) are arranged for exerting counteracting transversal and axial forces on said fibers ( 3 ) and said fixing matrix material ( 7 ) when said interface is subject to axial forces.