WE CLAIM:
1. A rotor blade for a wind turbine, comprising:
a first blade segment and a second blade segment extending in opposite directions from a chord-wise joint, each of the first and second blade segments comprising at least one shell member defining an airfoil surface and an internal support structure, the internal support structure of the first blade segment comprising a beam structure extending lengthwise that structurally connects with the internal support structure of the second blade segment via a receiving section; and,
one or more pin joints positioned on at least one of internal support structures of the first blade segment or the second blade segment,
wherein at least one of internal support structures of the first blade segment or the second blade segment comprises varying material combinations along a span of the rotor blade at locations of the one or more pin joints so as to reinforce the one or more pin joints.
2. The rotor blade as claimed in claim 1, wherein at least one of the internal support structures of the first and second blade segments comprise at least one shear web connected with a suction side spar cap and a pressure side spar cap, the shear web comprising the varying material combinations along the span of the rotor blade at the locations of the one or more pin joints.
3. The rotor blade as claimed in claim 2, wherein the varying material combinations comprises at least one of varying resin materials, varying metal materials, varying fiber materials, varying fiber orientations, and/or combinations thereof.
4. The rotor blade as claimed in claim 3, wherein the varying resin materials comprise at least one of a thermoset resin or a thermoplastic resin.
5. The rotor blade as claimed in claim 3, wherein the varying fiber materials comprise at least one of glass fibers, carbon fibers, polymer fibers, wood fibers, bamboo fibers, ceramic fibers, nanofibers, metal fibers, or combinations thereof.
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6. The rotor blade as claimed in claim 3, wherein a fiber orientation at the locations of the one or more bolts joints comprises a quasi-isotropic fiber orientation.
7. The rotor blade as claimed in claim 3, wherein a thickness of the shear web at the locations of the one or more pin joints is greater than a thickness of remaining portions of the shear web.
8. The rotor blade as claimed in claim 1, wherein the varying material combinations further comprise one or more reinforcement members at the locations of the one or more pin joints.
9. The rotor blade as claimed in claim 8, wherein the one or more reinforcement members comprise at least one tapered transition feature at an edge thereof.
10. The rotor blade as claimed in claim 1, wherein the one or more pin joints comprises, at least, one or more first pin joints located at a first end of the beam structure for connecting with a receiving end of the receiving section of the second blade segment, the one or more first pin joints comprising at least one pin tube embedded in a first material combination of the varying material combinations.
11. The rotor blade as claimed in claim 10, wherein the first blade segment comprises at least one chord-wise extending pin joint slot located on the beam structure proximate to the chord-wise joint, the at least one pin joint slot surrounded by a second material combination of the varying material combinations, wherein the first and second material combinations differ from a primary material combination of the shear web.
12. A rotor blade for a wind turbine, comprising:
at least one blade segment comprising at least one shell member defining an airfoil surface and an internal support structure, the internal support structure extending in a span-wise direction of the rotor blade, wherein the internal support structure comprises at least one shear web connected with a suction side spar cap and a pressure side spar cap,
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wherein the shear web is constructed of a core material combination sandwiched between a leading edge material combination and a trailing edge material combination, at least one of the core material combination or the leading edge or trailing edge material combinations varying along a span of the rotor blade.
13. The rotor blade as claimed in claim 12, wherein an interface between at least one of the varying core material combination or the varying leading edge or trailing edge material combinations is linear, curved, circular, semi-circular, or elliptical.
14. The rotor blade as claimed in claim 12, wherein the core material combination and the leading edge or trailing edge material combinations comprise a common resin material.
15. A method of assembling a rotor blade of a wind turbine, the method comprising:
arranging a first blade segment and a second blade segment in opposite directions from a chord-wise joint, each of the blade segments having a shell member defining an airfoil surface and an internal support structure, at least one of the internal support structures of the blade segments comprising a shear web;
inserting the beam structure extending lengthwise from the first blade segment into a receiving section of the second blade segment;
attaching a free end of the beam structure with a receiving end of the receiving section of the second blade segment using one or more first pin joints; and,
connecting the first and second blade segments using one or more second pin joints located at the chord-wise joint, wherein, when the first and second blade segments are connected, a thickness of the shear web at locations of at least one of the one or more first pin joints or the one or more second pin joints is greater than a thickness of remaining portions of the shear web so as to reinforce at least one of the one or more first pin joints or the one or more second pin joints.
16. The method as claimed in claim 15, wherein the varying material
combinations comprises at least one of varying resin materials, varying metal
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materials, varying fiber materials, varying fiber orientations, and/or combinations thereof, the varying resin materials comprising at least one of a thermoset resin or a thermoplastic resin, the varying fiber materials comprising at least one of glass fibers, carbon fibers, polymer fibers, wood fibers, bamboo fibers, ceramic fibers, nanofibers, metal fibers, or combinations thereof.
17. The method as claimed in claim 15, comprising at least one of infusing or bonding the varying material combinations to the shear web.
18. The method as claimed in claim 15, comprising placing one or more reinforcement members at the locations of the one or more first pin joints to provide the varying material combinations.
19. The method as claimed in claim 19, comprising forming at least one tapered transition feature into an edge of the one or more reinforcement members.
20. The method as claimed in claim 15, wherein the one or more first pin joints further comprise at least one pin tube embedded in a first material combination of the varying material combinations, the first blade segment comprising at least one chord-wise extending pin joint slot located on the beam structure proximate to the chord-wise joint, the at least one pin joint slot surrounded by a second material combination of the varying material combinations, wherein the first and second material combinations differ from a primary material combination of the shear web.

AZURRA Agent for the Applicant [IN/PA -1472]
Dated this the 31st day of October, 2018
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