Abstract: A method for manufacturing a fibre reinforced composite by means of a vacuum assisted resin transfer moulding, comprising the steps of placing a fibre material in a mould, placing a flow distribution medium onto the fibre material, and covering the fibre material (1) and the flow distribution medium with a vacuum foil for forming a closed mould cavity between the mould and the vacuum foil is described. It is characterised in using a flow distribution medium with a thickness depending on a pressure gradient over the vacuum foil.

Abstract: A method of manufacturing a rotor blade for a wind turbine is provided. The method includes steps of providing a mould defining an outer shape of a the rotor blade or a portion thereof; arranging a plurality of fibre fabric layers on a surface of the mould having at least one inclined surface portion; and laminating the fibre fabrics layers together by infusing a liquid resin into the mould. A step of interlocking the plurality of fibre fabric layers using at least one mechanical interlocking element prior to laminating the fibre fabric layers together is carried out.

Abstract: The disclosure relates to a fibre reinforced plastic composite material, including a vacuum assisted resin transfer moulded fibre reinforced plastic laminate prepared by use of a resin flow enhancing member, including a cavity with a first opening and a second opening as well as an resin flow adjusting arrangement for changing a resin flow cross section in a resin flow direction from the first opening to the second opening in the resin flow enhancing member by applying vacuum to the second opening. The resin flow adjusting arrangement includes a plurality of vacuum expandable filler elements that includes gas-filled closed cell cavities and flexible walls. The disclosure further relates to a vacuum assisted resin transfer moulding process for injecting resin from a resin flow enhancing member into a fibre stack.

Abstract: A wind turbine rotor blade, including a first blade section, a second blade section and at least one pre-stressed tensioning element for connecting the first blade section and the second blade section with each other, wherein the rotor blade is split at an interface thereof in a longitudinal direction into the first blade section and the second blade section, wherein the first blade section is arranged closer to a root of the rotor blade than the second blade section, wherein a length of the at least one pre-stressed tensioning element is larger than half of a chord length of the rotor blade at the interface and wherein the at least one pre-stressed tensioning element extends deeper into the first blade section than into the second blade section, is provided.

Abstract: A sandwich core material for a sandwich laminate is disclosed. The sandwich core material includes a number of flexible core material elements having a longitudinal structure. A flexible core material for a sandwich core material, a sandwich laminate and a wind turbine blade including such a sandwich core material are provided. In addition, the present a method of manufacturing such a sandwich core material is provided.

Abstract: A method for manufacturing a fibre reinforced composite by means of a vacuum assisted resin transfer moulding, comprising the steps of placing a fibre material in a mould, placing a flow distribution medium onto the fibre material, and covering the fibre material (1) and the flow distribution medium with a vacuum foil for forming a closed mould cavity between the mould and the vacuum foil is described. It is characterised in using a flow distribution medium with a thickness depending on a pressure gradient over the vacuum foil.

Abstract: A method for manufacturing a fiber reinforced composite by means of a vacuum assisted resin transfer molding, comprising the steps of placing a fiber material in a mold, placing a flow distribution medium onto the fiber material, and covering the fiber material (1) and the flow distribution medium with a vacuum foil for forming a closed mold cavity between the mold and the vacuum foil is described. It is characterized in using a flow distribution medium with a thickness depending on a pressure gradient over the vacuum foil.

Abstract: A fiber reinforced composite, a component for a wind turbine and a method for manufacturing a component for a wind turbine are provided. The fiber reinforced composite includes a plurality of first fibers, the first fibers being arranged in a unidirectional or biax-configuration, a plurality of second fibers, the second fibers being arranged perpendicularly with respect to a lengthwise direction of the first fibers, and a resin impregnating the first and second fibers, wherein a E-modulus of the resin equals an E-modulus of the second fibers. Since the E-modulus of the resin and the E-modulus of the second fibers are equal, an early initiation of fatigue cracks is avoided.

Abstract: A method for manufacturing a composite is provided herein, including laying at least one reinforcement layer onto the inner surface of a mold, positioning a degradable membrane onto the outermost reinforcement layer of the at least one reinforcement layer, applying suction between the inner surface of the mold and the degradable membrane to press the at least one reinforcement layer towards the inner surface of the mold, covering the degradable membrane with at least one vacuum film, generating a vacuum in the region between the vacuum film and the mold, injecting resin into this region by means of vacuum, and letting cure the resin, initiating a degradation of the degradable membrane by provoking a physical or chemical change of the membrane material after having generated a vacuum in the region between the vacuum film and the mold and before the resin has cured completely.

Abstract: The disclosure relates to a fibre reinforced plastic composite material, including a vacuum assisted resin transfer moulded fibre reinforced plastic laminate prepared by use of a resin flow enhancing member, including a cavity with a first opening and a second opening as well as an resin flow adjusting arrangement for changing a resin flow cross section in a resin flow direction from the first opening to the second opening in the resin flow enhancing member by applying vacuum to the second opening. The resin flow adjusting arrangement includes a plurality of vacuum expandable filler elements that includes gas-filled closed cell cavities and flexible walls. The disclosure further relates to a vacuum assisted resin transfer moulding process for injecting resin from a resin flow enhancing member into a fibre stack.

Abstract: The disclosure relates to a resin flow enhancing member, including a cavity with a first opening and a second opening as well as an resin flow adjusting arrangement for changing a resin flow cross section in a resin flow direction from the first opening to the second opening in the resin flow enhancing member by applying vacuum to the second opening. The disclosure further relates to a fiber reinforced plastic laminate including a fiber stack and at least one resin flow enhancing member as well as to a fiber reinforced plastic composite material prepared by using a resin flow enhancing member. The disclosure further relates to a vacuum assisted resin transfer molding process for injecting resin from a resin flow enhancing member into a fiber stack.

Abstract: A wind turbine rotor blade, including a first blade section, a second blade section and at least one pre-stressed tensioning element for connecting the first blade section and the second blade section with each other, wherein the rotor blade is split at an interface thereof in a longitudinal direction into the first blade section and the second blade section, wherein the first blade section is arranged closer to a root of the rotor blade than the second blade section, wherein a length of the at least one pre-stressed tensioning element is larger than half of a chord length of the rotor blade at the interface and wherein the at least one pre-stressed tensioning element extends deeper into the first blade section than into the second blade section, is provided.

Abstract: A method of manufacturing a rotor blade for a wind turbine is provided. The method includes steps of providing a mould defining an outer shape of a the rotor blade or a portion thereof; arranging a plurality of fibre fabric layers on a surface of the mould having at least one inclined surface portion; and laminating the fibre fabrics layers together by infusing a liquid resin into the mould. A step of interlocking the plurality of fibre fabric layers using at least one mechanical interlocking element prior to laminating the fibre fabric layers together is carried out.

Abstract: A sandwich laminate for wind turbine blades includes a sandwich core material and an upper laminate part and a lower laminate part, wherein the upper laminate part and the lower laminate part have a thermoplastic matrix material and heating elements. The heating elements are electrically conductive fibers constituting electric circuits in the interior part of the thermoplastic matrix. Further, a wind turbine blade including such a sandwich laminate as well as a method of manufacturing such a sandwich laminate are provided.

Abstract: A rotor blade for a wind turbine has an elongate blade base body with a plurality of connecting elements. Each connecting element comprises at least one axially extending connecting portion adapted to be connected with corresponding connecting portions of a rotor hub of the wind turbine. The connecting elements are connected in a circumferential direction so as to build a closed ring-shape.

Abstract: A rotor blade for a wind turbine is provided. The rotor blade includes an elongate blade base body with a number of connecting elements each having at least one axially extending connecting portion adapted to be connected with at least one corresponding connecting portion of a rotor hub of a wind turbine, wherein the respective connecting elements are connected to at least two circumferentially extending connecting members with the connecting members being adjacently disposed in circumferential direction so as to build a ring-like shape. Further, a wind turbine with such a rotor blade is provided.

Abstract: A root bushing for a wind turbine rotor blade is provided herein. The root bushing includes a cylindrical shape with longitudinal grooves. The root bushing has the advantage that a bonding area between the root bushing and the fiber composite material is enlarged in comparison to known cylindrical root bushings. In another embodiment, a method for manufacturing a wind turbine rotor blade for a wind turbine is provided. The method includes a) providing (S1) a root bushing, wherein the root bushing has a cylindrical shape with longitudinal grooves, b) providing (S2) a unidirectional fiber weave, c) wrapping (S3) the unidirectional fiber weave around the root bushing such that roving yarns of the unidirectional fiber weave are placed in the grooves, and d) impregnating (S4) the unidirectional fiber weave with a resin.

Abstract: A rotor blade for a wind turbine has an elongate blade base body with a plurality of connecting elements. Each connecting element comprises at least one axially extending connecting portion adapted to be connected with corresponding connecting portions of a rotor hub of the wind turbine. The connecting elements are connected in a circumferential direction so as to build a closed ring-shape.

Abstract: A sandwich core material for a sandwich laminate is disclosed. The sandwich core material includes a number of flexible core material elements having a longitudinal structure. A flexible core material for a sandwich core material, a sandwich laminate and a wind turbine blade including such a sandwich core material are provided. In addition, the present a method of manufacturing such a sandwich core material is provided.

Abstract: A fiber reinforced composite, a component for a wind turbine and a method for manufacturing a component for a wind turbine are provided. The fiber reinforced composite includes a plurality of first fibers, the first fibers being arranged in a unidirectional or biax-configuration, a plurality of second fibers, the second fibers being arranged perpendicularly with respect to a lengthwise direction of the first fibers, and a resin impregnating the first and second fibers, wherein a E-modulus of the resin equals an E-modulus of the second fibers. Since the E-modulus of the resin and the E-modulus of the second fibers are equal, an early initiation of fatigue cracks is avoided.