STRUCTURAL WARP KNIT SHEET AND LAMINATE THEREOF

摘要

The invention relates to a warp knit sheet which has excellent conformability to shapes having a curved surface and has excellent mechanical properties, which can form a thick-wall part, which can accommodate a molding method having excellent suitability for mass production, and which is for use in spars or stringers each having a curved surface. The invention further relates to a laminate of the warp knit sheets. The structural warp knit sheet is a warp knit sheet for spars or stringers which comprises: a warp knit structure constituted of chain-stitch structures configured of ground knitting yarns; longitudinal insertion yarns that have been inserted in the longitudinal direction into the warp knit structure, the longitudinal insertion yarns being continuous carbon fiber yarns; and transverse insertion yarns that have been inserted in directions along which the transverse insertion yarns shuttle between the adjacent chain-stitch structures, the chain-stitch structures having been united by means of the transverse insertion yarns. The longitudinal insertion yarns are carbon fiber yarns which each is composed of 12,000-50,000 filaments and has a tensile strength of 4 GPa or higher, a tensile modulus of 220-450 GPa, and a drape value of 4-22. The structural warp knit sheet has been configured so that the longitudinal insertion yarns in the warp knit sheet each can be moved independently of the adjacent yarns and can be arranged along the shape of a curved surface.