Hybrid material pad

Abstract

A hybrid material mat (110, 111) for use in the manufacture of fibre composite articles, particularly for use in parts of wind turbine blades (10), is described. The mat (110, 111) comprises a plurality of glass fibre rovings (112) provided on top of a relatively thin planar substrate of carbon fibres (114). The hybrid mat (110, 111) construction provides improvements in the structural properties of components manufactured using the mat (110, 111), and allows ease of handling and manufacture of both the mat (110, 111) itself and the components.

Description

[0001] This application is a divisional application of Chinese patent application No. 201480042147.5, filed on July 22, 2014, entitled "Mixed Material Pad". Technical Field

[0002] The present invention relates to a composite material pad for manufacturing fiber composite articles such as wind turbine blades, a method for manufacturing such a pad, a method for manufacturing fiber composite articles using such a pad, and fiber composite articles incorporating such a pad, for example, wind turbine blades. Background Technology

[0003] Fiber composite products, such as wind turbine blades, are generally formed by initially depositing several fiber layers in a molding die, followed by impregnation of the fibers with resin, and then curing the resin. This creates a structure of fiber layers suspended in a matrix of cured resin. This manufacturing method results in a relatively lightweight yet structurally strong structure. The choice of specific fibers used in the manufacturing process determines the final structural properties of the product.

[0004] Traditionally, glass fiber has been used in fiber composite manufacturing, but there is increasing interest in using carbon fiber for wind turbine blade manufacturing because carbon fiber is more rigid than glass fiber. However, carbon fiber is more expensive than glass fiber.

[0005] U.S. Patent No. 7,758,313 discloses a method for manufacturing a spar cap for wind turbine blades, wherein the spar cap is formed from a mixture of carbon fiber and glass fiber, thereby providing a hybrid effect that increases the rigidity of the component while reducing costs compared to pure carbon blades.

[0006] US 7,758,313 discloses a first embodiment in which glass fibers and carbon fibers are uniformly mixed within a common matrix. This approach presents significant manufacturing challenges because the accurate and uniform distribution of carbon and glass fibers requires the use of precise manipulators to position the fibers to ensure adequate process control.

[0007] US 7,758,313 discloses a second embodiment in which glass fiber layers and carbon fiber layers are alternately laid in a mold and then impregnated with a matrix material. This approach results in easier material supply than the first embodiment. However, applying layers of two different materials to the mold requires the use of two separate application machines, or at least two separate application steps during the manufacturing process to receive the layers from separate material sources, thereby increasing the time and / or cost involved in the manufacturing process.

[0008] See Figure 5It is also known to provide an "in-ply" composite material 100, wherein the layers of material 100 are provided by a row of glass fiber rovings 102, wherein carbon fiber bundles 104 are positioned at intervals within the arrangement of the glass fiber rovings 102. Although this construction performs relatively well, additional measures must be taken to ensure that the electrical potential of the conductive carbon fibers located in the material is equal, which introduces further complexity into the operation and manufacturing process.

[0009] The purpose of this invention is to provide a material for the manufacture of fiber composite products, particularly wind turbine blades, which eliminates the above-mentioned problems and provides ease of manufacture for both the material itself and the products. Summary of the Invention

[0010] Therefore, a composite material pad for manufacturing fiber composite articles such as wind turbine blades is provided, the composite material pad comprising multiple glass fiber rovings disposed on a carbon fiber substrate.

[0011] By providing a single pad or layer of material with a combination of glass fiber and carbon fiber, this allows for easy handling and layup in the manufacture of fiber composite articles. This arrangement of glass fiber rovings on a carbon fiber substrate provides improved performance superior to existing technologies, with tests showing that the above structure offers 140% higher compressive strength compared to conventional in-layer hybrid materials. Furthermore, providing glass fiber rovings on top of a thin carbon fiber layer allows for easy fabrication of the material pad.

[0012] It will be understood that the mixed material pad is preferably provided as a dry fiber pad.

[0013] It will be understood that the carbon fiber substrate is a planar layer of carbon fibers. On one hand, the carbon fiber substrate is formed from at least one carbon fiber filament bundle that has been flattened or stretched into a relatively thin layer.

[0014] Preferably, the hybrid material pad is provided as a flexible material layer, wherein the thickness ratio of the carbon fiber substrate to the plurality of glass fiber rovings is approximately 1:10. On one hand, the carbon fiber substrate is approximately 0.1 mm thick, and the glass fiber rovings have a thickness or diameter of approximately 1 mm. The hybrid material pad itself has a thickness between approximately 0.9 and 1.2 mm, preferably approximately 1 to 1.1 mm.

[0015] Preferably, the plurality of glass fiber rovings are arranged as a series of parallel, longitudinally extending rovings positioned on top of the carbon fiber substrate. Preferably, the carbon fiber substrate comprises a longitudinally extending layer of carbon fibers.

[0016] On one hand, the plurality of glass fiber rovings are disposed on a first side of the hybrid material pad, and the carbon fiber substrate is disposed on a second side of the hybrid material pad, wherein at least one carbon fiber bundle is positioned between the plurality of glass fiber rovings on top of the carbon fiber substrate, and the at least one carbon fiber bundle provides potential equality between the first side and the second side of the hybrid material pad.

[0017] To provide a conductive path between the carbon fiber substrates in the stack of the hybrid pad, a small number of carbon fiber bundles may be positioned in the glass fiber roving layer to provide conductive material on the first side of the pad.

[0018] Preferably, at least one carbon fiber tow is positioned between the plurality of glass fiber rovings, such that the ratio of carbon fiber to glass fiber rovings in the composite pad is between approximately 1:50 and 1:100, preferably approximately 1:80.

[0019] In one embodiment, carbon fiber tows having a diameter or thickness of about 1 to 2 mm are provided to glass fiber rovings of about 80 mm each.

[0020] Preferably, the hybrid material pad is provided as a roll of flexible fabric material.

[0021] Providing the material pad as a flexible material allows the mixed material to be stored as a roll of fabric material for easy handling and storage.

[0022] Preferably, the hybrid material pad also includes a stitching material used to stitch the plurality of glass fiber rovings to the carbon fiber substrate.

[0023] The stitching material can be any suitable fibrous material used to hold the glass fiber roving and the carbon fiber substrate in a single pad.

[0024] A method for manufacturing a hybrid material pad is also provided, the method comprising the following steps:

[0025] Compressing at least one carbon fiber tow to form a flattened carbon fiber substrate; and

[0026] Multiple glass fiber rovings are attached to the carbon fiber substrate to form a hybrid material pad.

[0027] The structure of the hybrid material pad allows for easy manufacturing of the pad itself, which is formed by relatively simple process steps for attaching glass fiber rovings to a carbon fiber substrate.

[0028] Preferably, the attachment step includes sewing the plurality of glass fiber rovings onto the carbon fiber substrate.

[0029] Preferably, the compression step includes dividing the at least one carbon fiber bundle into multiple individual bundle portions and flattening the multiple individual bundle portions to form a flattened base layer.

[0030] A method for manufacturing at least a portion of a fiber composite article, preferably at least a portion of a wind turbine blade, is also provided, the method comprising:

[0031] A hybrid material pad comprising a plurality of glass fiber rovings disposed on a carbon fiber substrate is provided, the plurality of glass fiber rovings being arranged on a first side of the hybrid material pad and the carbon fiber substrate being arranged on a second side of the hybrid material pad;

[0032] Arrange multiple of the aforementioned mixed material pads in the mold;

[0033] Impregnate the plurality of mixed material pads with resin; and

[0034] The resin is cured to form at least a portion of a fiber composite article, preferably at least a portion of a wind turbine blade.

[0035] Preferably, the arrangement step includes positioning a plurality of hybrid material pads such that the plurality of hybrid material pads at least partially overlap in the stack.

[0036] On one hand, the method includes the step of providing the hybrid material pad having at least one carbon fiber bundle positioned between the plurality of glass fiber rovings on the carbon fiber substrate, wherein the at least one carbon fiber bundle provides potential equalization between the first side and the second side of the hybrid material pad.

[0037] In an additional or alternative aspect, the arrangement steps include:

[0038] The plurality of mixed material pads are positioned in the mold, wherein the first side of the mixed material pad is arranged to face downward in the mold;

[0039] The stack of at least partially overlapping hybrid material pads is arranged, wherein at the edges of the stack, the ends of a plurality of pads in the stack are staggered, such that at least a portion of the second side of the plurality of pads in the stack is exposed; and

[0040] A conductive material is positioned at the edge of the stack, extending between exposed portions of the plurality of pads in the stack, such that the conductive material provides equal potential among the plurality of hybrid material pads in the stack.

[0041] As an alternative approach to providing potential equalization among the layers of the hybrid material pad, the pad can be positioned as part of a stack of individual carbon fiber substrates present in the pad. This part can then be electrically coupled to each other to provide potential equalization between the individual substrates.

[0042] Preferably, the conductive material is provided as a carbon fiber material layer. Alternatively, the conductive material may include a metallic conductor.

[0043] Preferably, the hybrid material pad has a main fiber orientation, and the step of arranging the hybrid material pad in the mold includes aligning the pad such that the main fiber orientation of the pad is substantially parallel to the longitudinal direction of a portion of the wind turbine blade.

[0044] A portion of a wind turbine blade manufactured according to the above method was also provided.

[0045] It also provides the use of a composite material pad comprising multiple glass fiber rovings disposed on a carbon fiber substrate in the manufacture of wind turbine blades, preferably in the manufacture of laminated structures for wind turbine blades. Attached Figure Description

[0046] Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings, in which:

[0047] Figure 1 A wind turbine with multiple turbine blades is shown;

[0048] Figure 2 It shows Figure 1 A perspective view of the blades of a wind turbine;

[0049] Figure 3 It shows Figure 2 A schematic diagram of the airfoil profile of the blade;

[0050] Figure 4 Shown from above and from the side Figure 2 A schematic diagram of wind turbine blades;

[0051] Figure 5 This illustrates a hybrid material layer from the prior art;

[0052] Figure 6 A hybrid material pad according to a first embodiment of the present invention is shown;

[0053] Figure 7 A hybrid material pad according to a second embodiment of the present invention is shown;

[0054] Figure 8 It shows Figure 7 A cross-sectional view of the composite material pad stack of an embodiment;

[0055] Figure 9 A cross-sectional view of a stack of hybrid material pads in an arrangement for potential equalization is shown. Detailed Implementation

[0056] It will be understood that elements common to different embodiments of the present invention are given the same reference numerals in the drawings.

[0057] Figure 1 The diagram shows a conventional modern counterwind turbine 2 based on the so-called "Danish concept," which has a tower 4, a nacelle 6, and a rotor with a generally horizontal rotor shaft. The rotor includes a hub 8 and three blades 10 extending radially from the hub 8, each blade having a blade root 16 closest to the hub and a blade tip 14 furthest from the hub 8.

[0058] Figure 2 A schematic diagram of a wind turbine blade 10 is shown. The wind turbine blade 10 has the shape of a conventional wind turbine blade and includes a root region 30 closest to the hub, a profile or airfoil region 34 furthest from the hub, and a transition region 32 between the root region 30 and the airfoil region 34. The blade 10 includes a leading edge 18 facing the direction of rotation of the blade 10 when the blade is mounted on the hub, and a trailing edge 20 facing the opposite direction to the leading edge 18.

[0059] The airfoil region 34 (also called the profile region) has an ideal or near-ideal blade shape relative to the lift generation, while the root region 30 has a generally circular or elliptical cross-section for structural reasons, which, for example, makes mounting the blade 10 to the hub easier and safer. The diameter (or chord) of the root region 30 is generally constant along the entire root region 30. The transition region 32 has a transition profile that gradually changes from the circular or elliptical shape 40 of the root region 30 to the airfoil profile 50 of the airfoil region 34. The chord length of the transition region 32 generally increases with increasing distance r from the hub.

[0060] Airfoil region 34 has an airfoil profile of 50 ( Figure 3 The blade 10 has a chord extending between its leading edge 18 and trailing edge 20. The width of the chord decreases as the distance from the hub r increases.

[0061] It should be noted that the chords of different sections of the blade are generally not located in a common plane because the blade can be twisted and / or bent (i.e., pre-bent), thus providing a chord plane with a corresponding twist and / or bending path, which is the most frequent case, in order to compensate for the local velocity of the blade depending on the radius from the hub.

[0062] Figure 3A schematic diagram is shown of an airfoil profile 50 drawn as a typical wind turbine blade with various parameters, which is generally used to define the geometry of the airfoil. The airfoil profile 50 has a pressure side 52 and an intake side 54, which generally face the upwind (or headwind) side and the downwind (or tailwind) side, respectively, during operation, i.e., during rotor rotation. The airfoil 50 has a chord 60, which has a chord length c extending between the leading edge 56 and the trailing edge 58 of the blade. The airfoil 50 has a thickness t, which is defined as the distance between the pressure side 52 and the intake side 54. The thickness t of the airfoil varies along the chord 60. The deviation from the symmetrical profile is given by a centerline 62, which is the centerline passing through the airfoil profile 50. The centerline can be found by drawing an inscribed circle from the leading edge 56 to the trailing edge 58. The centerline runs along the center of these inscribed circles, and the deviation or distance from the chord 60 is called the camber f. Asymmetry can also be defined by using parameters called upper camber (or intake camber) and lower camber (or pressure camber), which are defined by distances from the chord 60 and the intake side 54 and pressure side 52, respectively.

[0063] Airfoil profiles are typically characterized by the following parameters: chord length c, maximum camber f, and the location d of maximum camber f. f , where is the maximum diameter of the inscribed circle along the mid-arc line 62, the maximum airfoil thickness t, and the position d of the maximum thickness t. t And the nose radius (not shown). These parameters are typically defined as ratios to the chord length c. Therefore, the local relative blade thickness t / c is given as the ratio between the local maximum thickness t and the local chord length c. Furthermore, the location d of the maximum pressure lateral deflection... p It can be used as a design parameter, and of course, the location of the maximum suction lateral curvature is also included.

[0064] Figure 4 Some other geometric parameters of the blade are shown. The blade has a total blade length L. For example... Figure 2 As shown, the root end is located at position r=0, and the tip end is located at position r=L. The shoulder 40 of the leaf is located at position r=L. w The blade has a shoulder width W equal to the chord length at the shoulder 40. The diameter at the root is defined as D. Furthermore, the blade is provided with a pre-bend defined as Δy, corresponding to an out-of-plane deflection from the blade's pitch axis 22.

[0065] The wind turbine blade 10 generally comprises a shell made of fiber-reinforced polymer and is typically manufactured as a pressure-side or jackknife shell portion 24 and an intake-side or downwind shell portion 26, which are glued together along a connecting line 28 extending along the trailing edge 20 and leading edge 18 of the blade 10. The wind turbine blade is generally formed of fiber-reinforced plastic materials, such as glass fiber and / or carbon fiber, arranged in a mold and cured with resin to form a three-dimensional structure. Modern wind turbine blades are typically over 30 or 40 meters long and have a root diameter of several meters. Wind turbine blades are generally designed for relatively long lifespans and are designed to withstand large structural and dynamic loads.

[0066] See Figure 6 An embodiment of the hybrid material mat according to an embodiment of the present invention is shown at 110. The material mat 110 comprises a plurality of glass fiber rovings 112 disposed on a thin carbon fiber substrate 114. The glass fiber rovings 112 are arranged on a first side 110a of the hybrid material mat 110, and the carbon fiber substrate 114 is arranged on a second side 110b of the hybrid material mat 110. It will be understood that the hybrid material mat is preferably provided as a dry fiber mat.

[0067] By providing carbon fiber as a thin sublayer of material 114 on which glass fiber roving 112 can be positioned, the pad 110 combines the advantageous properties of both glass fiber and carbon fiber into a single layer of material that is easy to manufacture, while balancing the overall cost of materials used in component manufacturing. Laboratory tests show that the above structure provides 140% more compressive strength compared to known hybrid material pads within layers. Furthermore, providing glass fiber and carbon fiber as part of a single fabric layer allows for easier lay-up and manufacture of fiber composite articles.

[0068] See Figure 7 Another embodiment of the hybrid material pad according to the invention is shown at 111. In this embodiment, at least one carbon fiber tow 116 is positioned between the glass fiber rovings 112 of the pad 111, and the carbon fiber tow 116 is in conductive contact with the underlying carbon fiber substrate 114. The presence of the carbon fiber tow 116 within the sublayers of the glass fiber rovings 112 allows for equal potential between the exposed surfaces of the carbon fiber substrate 114 located on the second side 111b of the pad 111 and the at least one carbon fiber tow 116 located on the first side 111a of the pad 111.

[0069] It will be understood that at least one carbon fiber tow 116 may be uniformly distributed within a sublayer of the glass fiber roving 112. On one hand, the ratio of carbon fiber to glass fiber roving in the composite pad is between approximately 1:50 and 1:100, preferably approximately 1:80. For example, when the roving and tow are approximately 1 mm in diameter, one carbon fiber tow is positioned between the glass fiber rovings for every 80 mm of width along the pad 111.

[0070] Preferably, the glass fiber roving 112 and the possible carbon fiber tow 116 have a diameter of approximately 1 mm. Preferably, the carbon fiber substrate 114 has a thickness of approximately 0.1 mm.

[0071] To form the carbon fiber substrate 114, preferably at least one carbon fiber tow (not shown) is compressed or flattened to form a relatively thin sublayer. The carbon fiber tow can be provided in a generally circular cross-section having a diameter of about 1 to 2 mm, which can be compressed into a planar sublayer having a thickness of about 0.1 mm and a width of about 30 mm. Alternatively, at least one carbon fiber tow can be divided into multiple individual tow portions, and said multiple individual tow portions are subsequently flattened or distributed to form a flattened or planar substrate layer 114. Glass fiber roving 112 and possibly at least one carbon fiber tow 116 are then attached to the carbon fiber substrate 114 using any suitable method, preferably by using a stitching material to sew the roving and tow to the substrate.

[0072] On the one hand, the hybrid material pads 110, 111 are arranged such that the pads comprise carbon fibers of approximately 20% to 40% by volume, preferably approximately 36%.

[0073] The composite material pads 110 and 111 can then be used in the manufacture of fiber composite articles, preferably for a portion of a wind turbine blade, by stacking multiple pads 110 and 111 in a mold and impregnating the multiple pads 110 and 111 with a curable resin to form the article. In the case of wind turbine blades, the composite material pads 110 and 111 can be used to manufacture the entire shell of the wind turbine blade, or can be used to manufacture component parts of the blade, for example, as a laminated structure or spars of the wind turbine blade.

[0074] In many components used outdoors, and particularly in wind turbine blades, protection against lightning strikes is a primary consideration in their manufacture and use. Generally, this involves incorporating a lightning receiver and down conductor into the component itself to provide a safe path through the down conductor to the ground in the event of a lightning strike. However, when the component includes conductive materials in its construction, it is extremely important that all such materials have the same potential as the lightning down conductor circuit to prevent the possibility of flashover or sparking in the event of a lightning strike.

[0075] See Figure 8 A first configuration of multiple hybrid material pads 111 is shown, arranged to facilitate equal potential among the individual pads 111. In this configuration, multiple pads 111 of a second embodiment are arranged in a stack within the article, wherein the carbon fiber tows 116 of each hybrid material pad 111 provide conductive paths between the carbon fiber substrates 114 of each pad 111, thereby ensuring that the conductive carbon fiber elements in the stack remain at the same potential. Therefore, the base of the stack or any carbon fiber substrate sublayer can be conductively coupled to a suitable lightning protection system of the article, thereby reducing the risk of flashover between different conductive elements of the article.

[0076] It will be understood that the carbon fiber bundles 116 in the laminate are in vertical alignment. Figure 8 The arrangement shown is merely exemplary, and the laminated pads 111 can be arranged in any layered orientation, for example, wherein the carbon fiber tows 116 are arranged in a generally arbitrary manner between the carbon fiber substrates 114 of the individual pads 111 in the laminate.

[0077] exist Figure 9 The diagram illustrates an additional or alternative configuration of multiple hybrid material pads 110 arranged to facilitate potential equalization among the individual pads 110. In this arrangement, the pads 110 are disposed in a stack 118 such that the first side 110a of the pad 110 faces downward, and the next pad 110 in the stack 118 rests on top of the second side 110b of the aforementioned pad 110. The pads 110 are arranged such that the edges of the successive pads 110 in the stack 118 are staggered, wherein a portion of the carbon fiber substrate 114 disposed on the second side 110b of each pad 110 in the stack 118 is exposed at the edge of the stack 118.

[0078] Conductive material 120 is positioned at the edge of the laminate 118 such that it at least partially covers and contacts the exposed portion of the carbon fiber substrate 114 in the laminate 118. In this way, conductive paths can be easily established between the different carbon fiber substrates 114 present in the laminate 118, which can then be easily connected to a suitable grounding connection of a lightning protection system.

[0079] The conductive material 120 may include any suitable conductive element capable of establishing a conductive connection between the carbon fiber substrates 114. On one hand, the conductive material 120 may include a layer of carbon fiber material covering the edges of the stack 118, the carbon fiber material maintaining contact with exposed portions of the carbon fiber substrates 114. Alternatively, the conductive material may include metallic elements suitable for attachment or positioning at the sides of the stack 118.

[0080] exist Figure 9In this context, the pad 110 is arranged as a staircase or step at the edge of the stack 118, but it will be understood that the pad 110 can be arranged in any suitable configuration that allows contact with the carbon fiber substrate 114 contained in the stack 118. Furthermore, it will be understood that... Figure 9 The arrangement of the pad 110 shown can be used to add to the pad 111 having the second embodiment of the present invention. Figure 8 The construction shown.

[0081] It will be understood that the term "roving" in the above description can be used to refer to a single fiber roving or a bundle of fiber rovings. A single roving can be understood as a bundle of individual fibers. In the case of using bundles of fiber rovings, it will be understood that the individual rovings in the roving bundle may have different sizes depending on the material used, for example, glass fiber rovings of approximately 0.02 mm and carbon fiber rovings of approximately 0.008 mm.

[0082] The use of the hybrid material pads 110, 111 according to the invention provides for the manufacture of fiber composite articles with improved structural quality in conjunction with controllable component costs, particularly for wind turbine blades. Furthermore, the specific construction of pads 110, 111 provides ease of manufacture of the pads themselves, as well as improved ease of handling the pads during the manufacture of articles including said pads. Additionally, the pad construction allows for simple and effective potential equalization techniques to improve the lightning protection quality of the finished articles.

[0083] This invention is not limited to the embodiments described herein, and may be modified or altered without departing from the scope of this invention.

Claims

1. A method for manufacturing at least a portion of a wind turbine blade, the method comprising: A hybrid material pad comprising a plurality of glass fiber rovings disposed on a carbon fiber substrate is provided, the plurality of glass fiber rovings being arranged on a first side of the hybrid material pad and the carbon fiber substrate being arranged on a second side of the hybrid material pad; Arrange multiple of the aforementioned mixed material pads in the mold; The plurality of mixed material pads are impregnated with resin; as well as The resin is cured to form at least a portion of the wind turbine blade. The method includes the step of providing the hybrid material pad having at least one carbon fiber tow, the at least one carbon fiber tow being positioned between the plurality of glass fiber rovings on the carbon fiber substrate and forming part of the hybrid material pad, and wherein the at least one carbon fiber tow provides potential equalization between the first side and the second side of the hybrid material pad.

2. The method according to claim 1, characterized in that, The hybrid material pad is provided as a dry fiber pad.

3. The method according to claim 1, characterized in that, The at least one carbon fiber bundle is positioned between the plurality of glass fiber rovings, such that the ratio of the carbon fiber bundle to the glass fiber rovings in the composite material pad is between 1:50 and 1:

100.

4. The method according to claim 3, characterized in that, The at least one carbon fiber bundle is positioned between the plurality of glass fiber rovings, such that the ratio of carbon fiber bundle to glass fiber roving in the hybrid material pad is 1:

80.

5. The method according to any one of claims 1 to 4, characterized in that, The arrangement step includes positioning a plurality of hybrid material pads such that the plurality of hybrid material pads at least partially overlap in the stack.

6. The method according to claim 5, characterized in that, The arrangement steps include: The plurality of mixed material pads are positioned in the mold, wherein the first side of the mixed material pad is arranged to face downward in the mold; The stack of at least partially overlapping hybrid material pads is arranged, wherein at the edges of the stack, the ends of a plurality of pads in the stack are staggered, such that at least a portion of the second side of the plurality of pads in the stack is exposed; and A conductive material is positioned at the edge of the stack, extending between exposed portions of the plurality of pads in the stack, such that the conductive material provides equal potential among the plurality of hybrid material pads in the stack.

7. The method according to claim 6, characterized in that, The conductive material is provided as at least one layer of carbon fiber material.

8. The method according to any one of claims 1 to 4, characterized in that, The step of providing the hybrid material pad includes providing the hybrid material pad as a flexible material layer.

9. The method according to any one of claims 1 to 4, characterized in that, The thickness ratio of the carbon fiber substrate to the multiple glass fiber rovings is 1:

10.

10. The method according to any one of claims 1 to 4, characterized in that, The step of providing the hybrid material pad includes arranging the plurality of glass fiber rovings as a series of parallel, longitudinally extending rovings positioned on top of the carbon fiber substrate, wherein the carbon fiber substrate comprises sublayers of longitudinally extending carbon fibers.

11. The method according to any one of claims 1 to 4, characterized in that, The step of providing the hybrid material pad includes providing a stitching material, which is used to stitch the plurality of glass fiber rovings to the carbon fiber substrate.

12. The method according to any one of claims 1 to 4, characterized in that, The hybrid material pad has a main fiber orientation, and the step of arranging the plurality of hybrid material pads in the mold includes aligning the pads such that the main fiber orientation of the pads is substantially parallel to the longitudinal direction of at least a portion of the wind turbine blade.

13. A method for manufacturing a hybrid material pad according to any one of claims 1 to 12, the method comprising the steps of: Compress at least one carbon fiber bundle to form a flattened carbon fiber substrate; as well as Multiple glass fiber rovings are attached to the carbon fiber substrate to form a hybrid material pad.

14. The method for manufacturing a hybrid material pad according to claim 13, characterized in that, The compression step includes dividing the at least one carbon fiber bundle into multiple individual bundle portions, and flattening the multiple individual bundle portions to form a flattened base layer.

15. A portion of a wind turbine blade manufactured by the method according to any one of claims 1 to 12.

16. A wind turbine comprising at least one wind turbine blade having at least a portion manufactured by the method according to any one of claims 1 to 12.

17. Use of a composite material pad comprising multiple glass fiber rovings disposed on a carbon fiber substrate in the manufacture of at least a portion of a wind turbine blade, wherein, The plurality of glass fiber rovings are arranged on a first side of the hybrid material pad, and the carbon fiber substrate is arranged on a second side of the hybrid material pad. The hybrid material pad has at least one carbon fiber bundle, which is positioned between the plurality of glass fiber rovings on the carbon fiber substrate and forms part of the hybrid material pad. The at least one carbon fiber bundle provides potential equality between the first and second sides of the hybrid material pad.

18. The use of a composite material pad comprising multiple glass fiber rovings disposed on a carbon fiber substrate in the manufacture of a laminated structure for wind turbine blades, wherein, The plurality of glass fiber rovings are arranged on a first side of the hybrid material pad, and the carbon fiber substrate is arranged on a second side of the hybrid material pad. The hybrid material pad has at least one carbon fiber bundle, which is positioned between the plurality of glass fiber rovings on the carbon fiber substrate and forms part of the hybrid material pad. The at least one carbon fiber bundle provides potential equality between the first and second sides of the hybrid material pad.

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