Interface between stiff piece and a composite material, a method for the formation of such an interface and a stiff piece therefore

A method for the formation of an interface between a stiff piece (1) and a composite material (2) comprising fibres (3) in a matrix material (7),

• characterised by the following steps,
• forming two or more vanes (4a,4b, . . . ) on said stiff piece (1), said vanes (4a,4b, . . . ) comprising two or more lateral respective surfaces (41a, 41b, 42a, 42b, 43a, 43b 44a, 44b),
• arranging one or more of said fibres (3) through at least one or more funnel-shaped throats (45) formed between said lateral surfaces (41a, 43a, 41b, 43b, . . . ) of adjacent vanes (4a, 4b, . . . ),
• arranging said matrix material (7) about said one or more fibres (3), at least in or near said funnel-shaped throats (45), and
• curing said matrix material (7) for the formation of a fixation between said stiff piece (1) and said composite material (2)
• said fixation arranged for exerting counteracting transversal and axial forces on said fibres (3) when said fixing material is subject to axial forces.

A stiff piece (1) for forming joint between a composite material (2) comprising fibres (3),

• characterized by
• said stiff piece (1) comprising two or more vanes (4a, 4b, . . . ) protruding from a surface of said stiff piece (1), said vanes (4a, 4b, . . . ) comprising two or more lateral surfaces (41, 42, 43, 44),
• one or more funnel-shaped throats (45) formed between lateral surfaces (41a, 43a, 41b, 43b, . . . ) of adjacent vanes (4a, 4b, . . . ), in which one or more fibres (3) of said composite material (2) shall be passed through,
• in which said vanes (4) are arranged for exerting counteracting transversal and axial forces on said fibres (3) and said fixing matrix material (7) when said interface is subject to forces.