Abstract: A wind turbine blade having a transition between two reinforcement fiber types is described. A gradual transition is provided by a combined double-tapered thickness section with a first type of reinforcement fibers sandwiched between a second type of reinforcement fibers or vice versa. The double-tapering is provided during layup and the reinforcement material is impregnated with a polymer resin and then cured or hardened so that the two types of reinforcement fibers are embedded in a common polymer matrix.

Abstract: The present disclosure provides a method of manufacturing a composite laminate structure of a wind turbine blade part by means of resin transfer moulding, preferably vacuum-assisted resin transfer moulding. In a resin transfer moulding, fibre-reinforcement material is impregnated with liquid resin in a mould cavity. The mould cavity comprises rigid mould part having a mould surface defining a surface of the wind turbine blade part. The method comprises alternately stacking on the rigid mould part: i. a number of unidirectional fibre-reinforcement layers comprising electrically conductive fibres, such as carbon fibres, and ii.

Abstract: A method of manufacturing a portion of a wind turbine blade is described. The method comprising the steps of: laying up a primary fiber material in a mold; infusing said primary fiber material with a primary resin; substantially curing said primary resin in said primary fiber material to form a cured blade element; laying up a secondary fiber material on top of at least a portion of said cured blade element; infusing said secondary fiber material with a secondary resin different to said primary resin, wherein said secondary resin has a higher strength level than said primary resin; and curing said secondary resin in said secondary fiber material to form an integrated reinforced section on said cured blade element.

Abstract: The present disclosure relates to a method for detecting a fibre misalignment in an elongated structure, such as a wind turbine blade component. The elongated structure has a length along a longitudinal direction and comprises a plurality of stacked reinforcing fibre layers. The plurality of fibre layers comprises fibres having an orientation aligned, unidirectionally, substantially in the longitudinal direction. The method comprises scanning the elongated structure along at least a part of the length by emitting an x-ray beam in an angle compared to the orientation of the fibres. The method comprises detecting scattered rays, and determining an intensity of the detected scattered rays. The method comprises estimating a size of the fibre misalignment based on the determined intensity.

Abstract: The present disclosure relates to a wind turbine blade. The wind turbine blade comprises a load carrying structure made of a fibre-reinforced polymer material. The load carrying structure comprises a plurality of stacked fibre layers or fibre mats in a thickness of the load carrying structure. The plurality of said stacked fibre layers or fibre mats are made of hybrid material comprising both carbon fibres and glass fibres and having a carbon fibre ratio. The carbon fibre ratio is defined as a volume of the carbon fibres divided by a total volume of the glass fibres and carbon fibres. At least a number of said stacked fibre layers or fibre mats have different carbon fibre ratios such that the carbon fibre ratio of fibre material varies through the thickness of the load carrying structure.

Abstract: A wind turbine blade, extending longitudinally root end to tip end, having a load carrying structure, a shell body and a lightning protection system is described. The load carrying structure is fiber-reinforced polymer in a plurality of stacked layers comprising electrically conductive fibers. The lightning protection system comprises a lightning receptor arranged freely accessible in or on the shell body and a lightning down-conductor electrically connected to the lightning receptor and is configured to be electrically connected to a ground connection. The blade further comprises a potential equalisation system providing a potential equalising connection between a number of the electrically conductive fibers of the load carrying structure and the lightning protection system.

Abstract: A method of manufacturing a composite laminate structure of a wind turbine blade part is performed by resin transfer moulding. The fibre-reinforcement material is impregnated with liquid resin in a mould cavity which includes a rigid mould part having a mould surface defining a surface of the wind turbine blade part. The method includes alternately stacking on the rigid mould part: i) a number of fibre-reinforcement layers including electrically conductive fibres and ii) a flow strip layer in form of a layer of flow strips having a strip width and which are arranged so as to form voids having a void width between two juxtaposed strips. The method includes sealing a second mould part against the rigid mould part in order to form the mould cavity, optionally evacuating the mould cavity, supplying a resin to the mould cavity, and curing the resin to form the composite laminate structure.

Abstract: A method and mould system for manufacturing I-shaped shear webs for wind turbine blades are described. The mould system comprises a lower web mould part having a concave shape with diverging side parts for manufacturing first sides of I-web foot flanges, and an upper mould part having a concave shape with converging side parts for manufacturing other sides of the I-web foot flanges.

Abstract: A method of manufacturing a portion of a wind turbine blade is described. The method comprising the steps of: laying up a primary fibre material in a mould; infusing said primary fibre material with a primary resin; substantially curing said primary resin in said primary fibre material to form a cured blade element; laying up a secondary fibre material on top of at least a portion of said cured blade element; infusing said secondary fibre material with a secondary resin different to said primary resin, wherein said secondary resin has a higher strength level than said primary resin; and curing said secondary resin in said secondary fibre material to form an integrated reinforced section on said cured blade element.

Abstract: A wind turbine blade having a transition between two reinforcement fibre types is described. A gradual transition is provided by a combined double-tapered thickness section with first type reinforcement fibres sandwiched between second type reinforcement fibres or vice versa. The double-tapering is provided during layup and that the reinforcement material is impregnated with a polymer resin and then cured or hardened so that the two types of reinforcement fibres are embedded in a common polymer matrix.

Abstract: A system and method for the manufacture of a wind turbine blade component is described, preferably a shear web component for a wind turbine. The shear web is manufactured by using a forming tool to define a flange-shaped cavity at an end of a web member. A resin is injected into the cavity and cured to form a flange cast onto the web member. The forming tool is subsequently removed from the web member to provide a component having a load-bearing flange formed from a cured resin.

Abstract: A hybrid material mat for use in the manufacture of fibre-composite articles, in particular parts for wind turbine blades, is described. The mat comprises a plurality of glass fibre rovings provided on top of a relatively thin planar substrate of carbon fibres. Such a hybrid mat construction provides for an improvement in the structural properties of a component manufactured using the mat, as well as allowing for ease of handling and manufacturing of both the mat itself and the component.

Abstract: In a method of manufacturing a blade shell half of a pre-bent wind turbine blade by means of vacuum-assisted resin transfer moulding (VARTM), a fibre lay-up (16) is placed on a mould surface (14) and a distribution layer (24) is placed above the fibre lay-up (16). At least one segmentation area is provided in the distribution layer by providing at least one transversely extending flow barrier in the distribution layer (24) preventing or restricting longitudinal resin flow to the distribution layer. A longitudinally extending first feed channel (27) is placed above the distribution layer (24). The first feed channel (27) is divided into at least two feed channel sections, a feed channel section being arranged in each distribution layer segment. A vacuum bag (43) is arranged on top of the mould part (13) to define a mould cavity. The mould cavity (44) is evacuated and liquid resin is supplied to each feed channel section through a resin inlet to fill the mould cavity and impregnate the fibre lay-up.

Abstract: In a method of manufacturing a blade shell half of a pre-bent wind turbine blade by means of vacuum-assisted resin transfer moulding (VARTM), a fibre lay-up (16) is placed on a mould surface (14) and a distribution layer (24) is placed above the fibre lay-up (16). At least one segmentation area is provided in the distribution layer by providing at least one transversely extending flow barrier in the distribution layer (24) preventing or restricting longitudinal resin flow to the distribution layer. A longitudinally extending first feed channel (27) is placed above the distribution layer (24). The first feed channel (27) is divided into at least two feed channel sections, a feed channel section being arranged in each distribution layer segment. A vacuum bag (43) is arranged on top of the mould part (13) to define a mould cavity. The mould cavity (44) is evacuated and liquid resin is supplied to each feed channel section through a resin inlet to fill the mould cavity and impregnate the fibre lay-up.