Manufacturing a wind turbine blade with butt jointed planks
OwnerSoeren Randrup Daugaard Henrichsen, Jens Grandjean Joergenseninventors
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Abstract
A wind turbine blade is provided, including two planks joined with each other in a longitudinal direction of the planks at joining surfaces by a butt joint, wherein each plank includes a main portion with a wedge-shaped recess and a wedge-shaped portion filling the recess, each wedge-shaped portion has a respective one of the joining surfaces and is tapered from its joining surface in a direction away from its joining surface, and a stiffness of a material of the wedge-shaped portions is smaller than a stiffness of a material of the main portions. By having the wedge-shaped portions, the load is transferred to the surrounding material over a larger area which reduces the stress concentration.
Claims16
A wind turbine blade, comprising two planks joined with each other in a longitudinal direction of the two planks at joining surfaces by a butt joint, wherein:
- each plank comprises a main portion with a wedge-shaped recess and a wedge-shaped portion filling the wedge-shaped recess;
- each wedge-shaped portion has a respective one of the joining surfaces and is tapered from its joining surface in a direction away from its joining surface;
- and
- a stiffness of a material of the wedge-shaped portions is smaller than a stiffness of a material of the main portion;
- wherein the wedge-shaped portions are joined together with each other at the joining surfaces;
- wherein the two planks are joined with each other by resin infusion.
A method for manufacturing a wind turbine blade, comprising:
- providing two planks each comprising a main portion with a wedge-shaped recess and a wedge-shaped portion filling wedge-shaped recess, wherein each wedge-shaped portion has a joining surface and is tapered from its joining surface in a direction away from its joining surface, and a stiffness of a material of the wedge-shaped portions is smaller than a stiffness of a material of the main portions, and
- joining the two planks with each other in a longitudinal direction of the planks at the joining surfaces by a butt joint, wherein the two planks comprise a fiber lay-up in a joining region and are joined with each other by infusing the fiber lay-up with resin and curing the resin.
A wind turbine blade, comprising two planks joined with each other in a longitudinal direction of the two planks at joining surfaces by a butt joint, wherein:
- each plank comprises a main portion with a wedge-shaped recess and a wedge-shaped portion filling the wedge-shaped recess;
- each wedge-shaped portion has a respective one of the joining surfaces and is tapered from its joining surface in a direction away from its joining surface;
- and
- a stiffness of a material of the wedge-shaped portions is smaller than a stiffness of a material of the main portion;
- wherein:
- each wedge-shaped portion has, as seen in cross section along the longitudinal direction, a shape of an isosceles triangle with its joining surface being a base of the isosceles triangle, or
- each wedge-shaped portion has, as seen in cross section along the longitudinal direction, a shape of a right-angled triangle with its joining surface being a cathetus of the right-angled triangle.
Dependencies are inferred from the claim text.