Wind turbine blade made of thermoplastic polymer composite, part of said blade and production method

A wind turbine blade comprising an outer casing formed at least in part of panels of thermoplastic polymer composite, defining a leading edge and a trailing edge of the wind turbine blade, and at least one stiffening member, made of polymer composite and extending along a longitudinal axis of the wind turbine blade, inside said wind turbine blade, said at least one stiffening member being arranged between at least one panel defining the leading edge and at least one panel defining the trailing edge,

• wherein the thermoplastic polymer composite comprises a fibrous reinforcement and a (meth)acrylic thermoplastic polymer matrix selected from the group consisting of poly(methyl methacrylate) (PMMA), copolymers of methyl methacrylate (MMA), or mixtures thereof,
• wherein at least one panel of thermoplastic polymer composite is connected to the at least one stiffening member by a weld-type interface,
• wherein the wind turbine blade comprises at least one resistive filament positioned at the weld-type interface,
• wherein the weld-type interface has a thickness of greater than or equal to 1 mm,
• wherein the wind turbine blade does not comprise more than 40% by weight of thermosetting polymer,
• wherein the wind turbine blade does not comprise more than 10% by weight of thermosetting adhesive,
• wherein the fibrous reinforcement is based on either continuous fibers or long fibers obtained from continuous fibers, both having an aspect ratio of at least 1000,
• wherein the (meth)acrylic thermoplastic polymer matrix has a glass transition temperature between 50° C. and 160° C., and
• wherein the (meth)acrylic thermoplastic polymer or a portion of the (meth)acrylic thermoplastic polymer has a melt flow index (MFI) according to ISO 1133 (230° C./3.8 kg) of less than 20 g/10 min.