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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 elongati

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.

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The invention claimed is: 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 t

The invention claimed is: 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. 2. Wind turbine blade according to claim 1, wherein the first type of fibres is glass fibres (1) and the second type of fibres is carbon fibres (2). 3. Wind turbine blade according to claim 1, characterised in that the quantitative ratio increases or decreases continuously from a first level to a second level. 4. Wind turbine blade according to claim 1, characterised in that the quantitative ratio varies continuously in a transition zone of a length less than the length of the blade. 5. Wind turbine blade according to claim 4, characterised in that the transition zone is provided between a first zone (I) and a second zone (II), said zone both having a substantially uniform quantitative ratio between the two types of fibres. 6. Wind turbine blade according to claim 5, wherein the length of the transition zone (II) is between 0.5 and 1 metre. 7. Wind turbine blade according to claim 4, wherein the blade is divided into the transition zone (II) including the blade root and an additional zone including the rest of the blade. 8. Wind turbine blade according to claim 4, wherein the blade is divided into the transition zone (II) including the blade tip and an additional zone including the rest of the blade. 9. Wind turbine blade according to claim 4, characterised in that fibres or fibre bundles of the first type (1) with different lengths extend from a first end of the transition zone (II) and fibres or fibre bundles of the second type (2) extend from the opposite end of the transition zone. 10. Wind turbine blade according to claim 4, characterised in that the transition zone (II) is formed of a laminate of several fibre layers (6, 7), in which each fibre layer has a boundary surface (10) at a position in the longitudinal direction, the fibre layer including fibres of the first type (6) on one side of the boundary surface and fibres of the second type (7) on the other side of the boundary face, the boundary surfaces (10) of each fibre layer being displaced in relation to the other layers in the longitudinal direction of the blade. 11. Wind turbine blade according to claim 10, wherein the boundary surfaces (11 )are serrated when seen in a sectional view parallel to the fibre layers (3, 4, 5). 12. Wind turbine blade according to claim 11, wherein the tips (12) of the serrated boundary surfaces (11) are displaced in relation to each other in the transverse direction of the blade. 13. Wind turbine blade according to claim 1, characterised in that at least another portion of the blade when seen in said sectional view has a constant content of fibres of the first type (1, 3, 6) and/or of the second type (2, 5, 7). 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. 15. Prefabricated transitional shell blank according to claim 14, characterised in that at least another portion of the shell blank when seen in said sectional view has a constant content of fibres of the first type (1, 3, 6) andlor of the second type (2, 5, 7). 16. Wind turbine blade of fiber-reinforced polymer comprising: 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. 17. Wind turbine blade according to claim 16, wherein a length of the transition zone is between 0.5 and 1 metre. 18. Wind turbine blade according to claim 16, wherein the two types of fibers are distributed in the polymer matrix such that carbon fibers or carbon fiber bundles with varying lengths extend from a first end of the transition zone and glass fibers or glass fiber bundles extend from an opposite end of the transition zone. 19. Wind turbine blade according to claim 16, 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. 20. Wind turbine blade according to claim 19, wherein the boundary surfaces are serrated in a sectional view parallel to the fiber layers. 21. Wind turbine blade of fiber-reinforced polymer comprising; 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. 22. A wind turbine blade comprising: 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. 23. A wind turbine blade as recited in claim 22, wherein the glass fibers comprise at least one of glass fibers and glass fiber bundles. 24. A wind turbine blade as recited in claim 22, wherein the carbon fibers comprise at least one of carbon fibers and carbon fiber bundles. 25. A wind turbine blade as recited in claim 22, wherein a length of the transition zone is between 0.5 and 1 meters. 26. A wind turbine blade as recited in claim 22, wherein the glass fibers comprise at least one of glass fibers and glass fiber bundles and the carbon fibers comprise at least one of carbon fibers and carbon fiber bundles. 27. A wind turbine blade as recited in claim 26, wherein the glass fibers and the carbon fibers are distributed in a polymer matrix such that the at least one of carbon fibers and carbon fiber bundles have varying lengths and extend from a first end of the transition zone and the at least one of glass fibers and glass fiber bundles have varying lengths and extend from an opposite end of the transition zone. 28. A wind turbine blade as recited in claim 22 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 a 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 surface, the boundary surfaces of each fiber layer being displaced in relation to each other in the longitudinal direction of the blade. 29. A wind turbine blade as recited in claim 28, wherein the boundary surfaces are serrated in a sectional view parallel to the fiber layers.