Transition zone in wind turbine blade
First Claim
1. Wind turbine blade of fibre-reinforced polymer including a first type of fibres (1,3, 6) of a first stiffness and a first elongation at breakage, and a second type of fibres (2, 5, 7) of a different stiffness and different elongation at breakage, characterised in that the two types of fibres are distributed in the polymer matrix and that in at least a portion of the blade when seen in a sectional view perpendicular to the longitudinal direction of the blade the quantitative ratio of the two types of fibres varies continuously in the longitudinal direction of the blade.
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Abstract
The invention relates to a wind turbine blade and a transitional shell blank for the manufacture of the shell of a wind turbine blade, the blade or the transitional shell blank being made of fibre-reinforced polymer including a first type of fibres (1, 3, 6) of a first stiffness and a first elongation at breakage, and a second type of fibres (2, 5, 7) of a different stiffness and a different elongation at breakage. According to the invention the two types of fibres are distributed in the polymer matrix. When seen in a sectional view perpendicular to longitudinal direction of the blade or the transitional shell blank, the quantitative ratio of the two types of fibres varies continuously in the longitudinal direction of the blade or of the transition shell blank.
86 Citations
29 Claims
- 1. Wind turbine blade of fibre-reinforced polymer including a first type of fibres (1,3, 6) of a first stiffness and a first elongation at breakage, and a second type of fibres (2, 5, 7) of a different stiffness and different elongation at breakage, characterised in that the two types of fibres are distributed in the polymer matrix and that in at least a portion of the blade when seen in a sectional view perpendicular to the longitudinal direction of the blade the quantitative ratio of the two types of fibres varies continuously in the longitudinal direction of the blade.
- 14. Prefabricated transition shell blank for the manufacture of the shell of a wind turbine blade, said transition shell blank being made of fibre-reinforced polymer including a first type of fibres (1, 3, 6) of a first stiffness and a first elongation at breakage, and a second type of fibres (2, 5, 7) of a different stiffness and a second elongation at breakage, characterised in that the two types of fibres are distributed in the polymer matrix and that in at least a portion of the shell blank when seen in a sectional view perpendicular to the longitudinal direction of the shell blank the quantitative ratio varies continuously in the longitudinal direction of the transitional shell blank.
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16. Wind turbine blade of fiber-reinforced polymer comprising:
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an inner end portion including a blade root and made substantially from fiber glass-reinforced polymer and including glass fibers; and an outer end portion including the blade tip and made substantially from carbon fiber-reinforced polymer and including carbon fibers, wherein the outer end portion opposite the blade tip includes a transition zone in which the carbon fibers are gradually replaced by glass fibers thus forming a smooth and gradual transition from the glass fibers to the carbon fibers. - View Dependent Claims (17, 18, 19, 20)
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21. Wind turbine blade of fiber-reinforced polymer comprising;
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an inner end portion including a blade root and made substantially from fiber glass-reinforced polymer; and an outer end portion including a blade tip and made substantially from carbon fiber-reinforced polymer, wherein the outer end portion opposite the blade tip includes a transition zone in which the carbon fibers are gradually replaced by glass fibers, and wherein the transition zone is formed of a laminate of several fiber layers, in which each fiber layer has a boundary surface at a position in the longitudinal direction, the fiber layer including carbon fibers on one side of the boundary surface and glass fibers on the other side of the boundary face, the boundary surfaces of each fiber layer being displaced in relation to each other in the longitudinal direction of the blade, wherein the boundary surfaces are serrated in a sectional view parallel to the fiber layers and wherein the tips of the serrated boundary surfaces are displaced in relation to each other in the transverse direction of the blade.
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22. A wind turbine blade comprising:
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a blade root made substantially from fiber glass-reinforced polymer including glass fibers; an outer end portion including a blade tip, the outer end portion made substantially from carbon fiber-reinforced polymer including carbon fibers; and a transition zone at a position between the blade root and the outer end portion, wherein in the transition zone, the glass fibers from the blade root are gradually replaced by the carbon fibers in the outer end portion, thus forming a smooth and gradual transition from the glass fibers to the carbon fibers. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification