Abstract: A root end device for a blade of a wind turbine is provided having a root end element including along a longitudinal extension a first axial end and a second axial end arranged opposed to the first axial end. The first axial end is coupleable to a hub of the wind turbine and the second axial end is coupleable to a blade section for transferring a compression force between the hub and blade section via the root end element. At least one tension element is arranged at the root end element between the first and second axial end, wherein the tension element has a first and second fixing section wherein the first fixing section is coupleable to the hub of the wind turbine and the second fixing section is coupleable to the blade section for transferring a tension force between the hub and blade section via the tension element.

Abstract: A method for manufacturing a composite is provided herein, including laying at least one reinforcement layer onto the inner surface of a mould, positioning a degradable membrane onto the outermost reinforcement layer of the at least one reinforcement layer, applying suction between the inner surface of the mould and the degradable membrane to press the at least one reinforcement layer towards the inner surface of the mould, covering the degradable membrane with at least one vacuum film, generating a vacuum in the region between the vacuum film and the mould, 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 mould and before the resin has cured completely.

Abstract: A fibre reinforced plastic composite is provided having a matrix material, a plurality of fibres for reinforcement of the matrix material, and at least one thermoplastic additive material for enhancing a fracture toughness of the fibre reinforced plastic composite, wherein the thermoplastic additive material is dissolved in the matrix material. The thermoplastic additive material may initially, i.e., before dissolution in a base material, be in a powdery or granulate form. Additionally, a plastic composite starting material, suitable for a fibre reinforced plastic composite, and a method of manufacturing a fibre reinforced plastic composite are provided. Finally, a component of a wind turbine having a fibre reinforced plastic composite 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 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: 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 fibre reinforced plastic laminate including a fibre stack and at least one resin flow enhancing member as well as to a fibre reinforced plastic composite material prepared by using a resin flow enhancing member. 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 method for manufacturing a fibre reinforced composite is provided. Fibre material is connected together by a thread, wherein the thread has material which at least partly degrades before the manufacturing of the fibre reinforced composite is finished.

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 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 fibres 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 circumferential direction so as to build a closed ring-shape.

Abstract: A method of manufacturing a bundle of roving yarns is described. The method is characterised in assembling a number of roving yarns of longitudinal unidirectional fibres and an additional component in a bundle. For example, at least one resin distribution means or a thermoplastic material may be placed as the additional component in the bundle.

Abstract: A method for manufacturing a work piece by Vacuum Assisted Resin Transfer Moulding is includes the steps of placing fibre rovings in a mould of a closed mould system which comprises a mould cavity, placing at least one resin distribution device between the fibre rovings, and applying vacuum to the closed mould system and injecting resin into the mould cavity.

Abstract: A crack detection system and a method for detecting cracks in a loaded engineering structure are provided. The system and method include a light source coupled and optical fibers that are led through the structure. The optical fibers have diameters below 75 ?m. The light source is coupled to the optical fibers.

Abstract: An arrangement for wetting fibers with a fluid is provided. The arrangement includes a channel for guiding one or more fibers passing through the channel from an inlet end of the channel to an outlet end of the channel. A fluid supply device is coupled to the channel, wherein the fluid supply device is adapted to contain a fluid. A suctioning device is coupled to the channel to suck the fluid supplied by the fluid supply device into the channel in order to wet the one or more fibers passing through. Further, a method is provided for wetting fibers with a fluid. The method includes the steps of directing one or more fibers into and through a channel, evacuating the channel and sucking the fluid into the channel, and holding the fluid in the channel while the one or more fibers are passing through the channel.

Abstract: A method to manufacture a component of a fibre reinforced structure is provided. A number of unconnected roving is used to form a roving bundle. A number of roving bundle is positioned automatically into a forming tool. The roving bundles are arranged in a way that at least one layer of the component is assembled. The roving bundles are aligned unidirectional into the forming tool. Each roving bundle is at least wetted with a matrix material before it is positioned into the forming tool.

Abstract: A fibre-reinforced plastic material with a matrix material and first fibres is provided. The first fibres are embedded in the matrix material. Further, filling pieces are embedded in the matrix material. The filling pieces are arranged between the first fibres to prevent crack propagation in the fibre-reinforced plastic material.

Abstract: A fibre-reinforced plastic material with a matrix material and fibres embedded in the matrix material is provided. A surface of the fibres has at least one groove extending a bonding surface of the fibres for an enhanced adhesion of the matrix material.

Abstract: A fibre-reinforced plastic material with a matrix material and fibres embedded in the matrix material is provided. Fibre spacers are embedded in the matrix material between the fibres to avoid direct fibre-to-fibre contacts.

Abstract: A fiber reinforced plastic-structure and to a method to produce the fiber reinforced plastic-structure are disclosed. At least two elements are used to build up the shape of the fiber reinforced plastic-structure. Two adjacent elements are connected via its contact-surfaces by an applied glue or resin. A mat is located between the contact-surfaces before the glue or resin is used to connect the elements. The mat comprises chopped fibers, which are oriented in a random manner.

Abstract: A crack detection system and a method for detecting cracks in a loaded engineering structure are provided. The system and method include a light source coupled and optical fibres that are led through the structure. The optical fibres have diameters below 75 ?m. The light source is coupled to the optical fibres.

Abstract: A method and an apparatus for recycling glass fibre material are disclosed, as well as products fabricated by the disclosed method. The invention deals with mechanically transforming glass fibre material extracted from a composite material in a first form to glass fibre material in a second form. The glass fibre material is further treated into a third form, the glass fibre material is further treated into a third form, the glass fibre material in the third form being suitable for insulation material. The glass fibre in the third form may be such insulation material as wool or cotton-like insulation material, insulation bats, insulation rolls, insulation pellets, insulation panels, such as curved panels and self-sustaining panels.