Processing method of test sample

Abstract

The invention provides a processing method of a test sample, and the processing method of the test sample comprises the following steps: arranging a core material plate group on a substrate, the core material plate group comprises a first core material plate and a second core material plate which are arranged at an interval in a first horizontal direction; a cushion block set is arranged between the first core material plate and the second core material plate, the cushion block set comprises two cushion blocks arranged in the second horizontal direction in a spaced mode, and the sizes of the cushion blocks are obtained according to the blade defect size; the two cushion blocks of the cushion block set are clamped through a first core material plate and a second core material plate of the core material plate set, so that a pouring groove is defined by the first core material plate, the second core material plate, the bottom lining cloth and the two cushion blocks; after resin is poured into the pouring groove, the resin is cured, and a sample plate is obtained; and cutting the sample plate along the first horizontal direction to remove the cushion block to obtain the test sample. Through the technical scheme provided by the invention, the problem that a test sample capable of reflecting real defects in a blade production process is lacked in related technologies can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blades, and in particular to a method for processing a test sample. Background Art

[0002] Wind turbine blades are key components of large wind turbines. They are the main body for absorbing wind energy and the main source of turbine load. Improving the reliability of wind turbine blade structures is the key to ensuring the safe and stable operation of wind turbines.

[0003] In order to reduce the manufacturing cost of blades, the weight of blades of the same length and power is getting lighter and lighter, so that the safety margin of the blade structure is getting lower and lower. Although the structural strength of the blades also meets the requirements of the design specifications, blade damage and fracture accidents frequently occur during service. The reason is that in addition to the uncertainty of the design method, defects in the blade manufacturing process (manufacturing deviation of the core material and manual laying operation specification errors) are important causes of blade failure. However, when the blade safety margin is very small, the impact of defects on the blade structure is more prominent. In the blade manufacturing process, the core material of the sandwich structure (including the upper panel, the upper glue layer, the core material, the lower glue layer and the lower panel) is manually laid flat in the blade mold. Due to the deviation of the core material manufacturing and the error of the laying operation, there are often gaps of varying degrees between the flat core materials. In order to evaluate the impact of the core material gap on the performance of the sandwich structure, it is necessary to prepare corresponding test specimens to determine the extent of the impact.

[0004] In order to study the impact of manufacturing defects on the structural performance of blades, it is necessary to manufacture test specimens that can reflect the actual defects in the blade production process and evaluate the impact of defects on the structural mechanical properties through experimental methods.

[0005] However, the related art lacks the manufacturing of test specimens that can reflect the real defects in the blade production process. Summary of the invention

[0006] The present invention provides a method for processing a test sample, so as to solve the problem in the related art that there is a lack of manufacturing a test sample capable of reflecting real defects in a blade production process.

[0007] The present invention provides a method for processing a test specimen, which comprises: arranging a core plate group on a base, the core plate group comprising a first core plate and a second core plate spaced apart in a first horizontal direction; arranging a cushion block group between the first core plate and the second core plate, the cushion block group comprising two cushion blocks spaced apart in a second horizontal direction perpendicular to the first horizontal direction, and obtaining a size of the cushion block according to a blade defect size; clamping two cushion blocks of the cushion block group by the first core plate and the second core plate of the core plate group, so that the first core plate, the second core plate, the base and the two cushion blocks are surrounded by a pouring groove; pouring resin into the pouring groove and then curing the resin to obtain a specimen plate; cutting the specimen plate along the first horizontal direction to remove the cushion blocks to obtain a test specimen.

[0008] Furthermore, the step of setting the size of the pad group according to the blade defect size includes: there are multiple blade defect sizes and multiple pad groups; the size of the pads in the multiple pad groups is obtained in a one-to-one correspondence according to the multiple blade defect sizes, and each pad group includes two pads.

[0009] Further, in the step of arranging the spacer block groups between the first core material plate and the second core material plate: a plurality of spacer block groups are arranged between the first core material plate and the second core material plate at intervals along the second horizontal direction.

[0010] Furthermore, in the step of arranging the core material plate group on the base, there are multiple core material plate groups; in the step of laying the cushion block group between the first core material plate and the second core material plate, there are multiple cushion block groups, and the multiple cushion block groups are respectively arranged between the first core material plate and the second core material plate of the multiple core material plate groups.

[0011] Furthermore, the step of clamping two cushion blocks of the cushion block group by the first core plate and the second core plate of the core plate group includes: connecting the first core plate and the second core plate by an elastic member so that the first core plate and the second core plate clamp the cushion block group.

[0012] Furthermore, the step of connecting the first core plate and the second core plate through the elastic member includes: setting a first hook on the first core plate; setting a second hook on the second core plate; and connecting the two ends of the elastic member to the first hook and the second hook respectively.

[0013] Furthermore, in the step of setting the first hook on the first core material board, the two first hooks are respectively attached to the two sides of the first core material board in the second horizontal direction; in the step of setting the second hook on the second core material board, the two second hooks are respectively attached to the two sides of the second core material board in the second horizontal direction; in the step of connecting the two ends of the elastic member to the first hook and the second hook respectively, the two elastic members are respectively arranged on the two sides of the first core material board and the second core material board in the second horizontal direction, and the first ends of the two elastic members are respectively connected to the two first hooks, and the second ends of the two elastic members are respectively connected to the two second hooks.

[0014] Furthermore, the step of connecting the first core plate and the second core plate through an elastic member includes: sleeve the elastic member on the outside of the first core plate and the second core plate, and the elastic member applies a tensioning force of the clamping pad group to the first core plate and the second core plate.

[0015] Furthermore, the step of cutting the sample plate along a first horizontal direction to remove the pad to obtain a test sample includes: performing a first cutting operation and a second cutting operation on the sample plate along the first horizontal direction; determining a distance between the first cutting operation and the second cutting operation in a second horizontal direction according to a preset sample thickness to obtain a test sample with a preset sample thickness.

[0016] Furthermore, between the step of clamping the two pads of the pad block group by the first core plate and the second core plate of the core plate group and the step of curing the resin after pouring resin into the pouring groove, the processing method of the test sample also includes: setting a top lining cloth above the first core plate, the second core plate and the two pads of the pad block group.

[0017] By applying the technical solution of the present invention, the size of the pad is obtained according to the required blade defect size of the test sample, and then the first core material board and the second core material board are arranged on the base, and the two pads are arranged between the first core material board and the second core material board. Since the pouring groove is surrounded by the first core material board, the second core material board, the base and the two pads, the resin is poured into the pouring groove and then cured to obtain a sample plate. The sample plate has a defect located on the side of the pad away from the base, and the cross-sectional size of the defect matches the required blade defect size of the test sample. The sample plate is cut along the first horizontal direction to remove the pad to obtain the required test sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram showing a method for processing a test specimen according to an embodiment of the present invention is shown;

[0020] Figure 2 shows a side view of a test specimen provided according to an embodiment of the present invention;

[0021] Figure 3 A side view of a sample plate provided according to an embodiment of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. core material board group; 11. first core material board; 12. second core material board;

[0024] 20. Base;

[0025] 30. Pad set; 31. Pad;

[0026] 40. elastic member; 41. elastic cord;

[0027] 51. First hook; 52. Second hook;

[0028] 60. Test specimens;

[0029] 70. Filling tank;

[0030] 80. Top lining cloth;

[0031] 90. Sample plate;

[0032] X, first horizontal direction; Y, second horizontal direction. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 As shown, an embodiment of the present invention provides a method for processing a test sample, and the method for processing the test sample includes:

[0035] The core plate group 10 is arranged on the base 20, and the core plate group 10 includes a first core plate 11 and a second core plate 12 which are arranged at intervals in a first horizontal direction;

[0036] The pad block group 30 is arranged between the first core material plate 11 and the second core material plate 12, and the pad block group 30 includes two pad blocks 31 arranged at intervals in a second horizontal direction perpendicular to the first horizontal direction, and the size of the pad block 31 is obtained according to the defect size of the blade;

[0037] The two cushion blocks 31 of the cushion block group 30 are clamped by the first core plate 11 and the second core plate 12 of the core plate group 10, so that the first core plate 11, the second core plate 12, the base 20 and the two cushion blocks 31 are surrounded by a pouring groove 70;

[0038] After the resin is poured into the pouring tank 70 and cured, a sample plate 90 is obtained;

[0039] The sample plate 90 is cut along a first horizontal direction to remove the spacer 31 to obtain a test sample.

[0040] By applying the processing method of the test specimen provided in this embodiment, the size of the pad 31 is obtained according to the required blade defect size of the test specimen, and then the first core material board 11 and the second core material board 12 are arranged on the base 20, and the two pads 31 are arranged between the first core material board 11 and the second core material board 12. Since the pouring groove 70 is surrounded by the first core material board 11, the second core material board 12, the base 20 and the two pads 31, the resin is poured into the pouring groove 70 and then cured to obtain a sample plate 90. The sample plate 90 has a defect located on the side of the pad 31 away from the base 20, and the cross-sectional size of the defect matches the required blade defect size of the test specimen. The sample plate 90 is cut along the first horizontal direction to remove the pad 31 to obtain the required test specimen.

[0041] Furthermore, compared to cutting a test sample from a defective blade product, in which the blade product is scrapped after the test sample is cut, and resources are wasted on parts of the blade product other than the cut portion, the test sample processing method provided in this embodiment does not require cutting on the blade product. It is only necessary to prepare a sample plate 90 with a groove and cut off the portion of the sample plate 90 with the pad 31 to obtain the test sample. There is no need to scrap the entire blade product, thereby reducing the processing cost of the test sample.

[0042] It should be noted that, based on the experience of wind turbine blade manufacturing, the geometric size range of blade defect size is known. Therefore, when using experimental methods to evaluate the impact of defects on structural mechanical properties, the blade defect size of the required test specimen is set in a preset manner within the known range. The results obtained from the specimen test can provide a basis and reference for subsequent blade design, and can also provide theoretical support for the structural reliability assessment of blades that already have such defects.

[0043] In the step of obtaining the size of the cushion block 31 according to the defect size of the blade, the obtained size of the cushion block 31 includes the height size of the cushion block 31 in the vertical direction and the length size in the first horizontal direction.

[0044] like Figure 1 As shown, the step of setting the size of the spacer block set 30 according to the blade defect size includes:

[0045] The blade defect size and the pad group 30 are both multiple;

[0046] The sizes of the pads 31 in the plurality of pad groups 30 are obtained in one-to-one correspondence with the plurality of blade defect sizes, and each pad group 30 includes two pads 31. By adopting the above steps, it is possible to determine the plurality of blade defect sizes within a known range, and obtain the plurality of pad groups 30 according to the plurality of blade defect sizes, and the size of the pads 31 in each pad group 30 corresponds to one of the blade defect sizes, so that the plurality of test specimens matching the plurality of blade defect sizes one-to-one can be obtained by using the plurality of pad groups 30.

[0047] like Figure 1 As shown, in the step of arranging the spacer block group 30 between the first core material plate 11 and the second core material plate 12:

[0048] A plurality of pad block groups 30 are arranged between the first core plate 11 and the second core plate 12 at intervals along the second horizontal direction. By arranging a plurality of pad block groups 30 between the first core plate 11 and the second core plate 12 at intervals along the second horizontal direction, a plurality of pouring grooves 70 corresponding to the plurality of pad block groups 30 are provided between the first core plate 11 and the second core plate 12. After pouring resin into the pouring grooves 70 and curing the resin, the defect groove of the obtained sample plate 90 has a plurality of cross-sectional dimensions in the second horizontal direction, and the plurality of cross-sectional dimensions are matched one by one with the plurality of blade defect dimensions. The sample plate 90 is cut multiple times, thereby removing the pad blocks 31 and obtaining a plurality of test samples of a plurality of blade defect dimensions.

[0049] like Figure 1 As shown, in the step of setting the core plate group 10 on the base 20, there are multiple core plate groups 10; in the step of laying the cushion block group 30 between the first core plate 11 and the second core plate 12, there are multiple cushion block groups 30, and the multiple cushion block groups 30 are respectively set between the first core plate 11 and the second core plate 12 of the multiple core plate groups 10. With the above method, after the resin is poured into the pouring groove 70 and the resin is cured, multiple sample plates 90 corresponding to the multiple cushion block groups 30 can be obtained at the same time, and the resin curing steps corresponding to different cushion block groups 30 are independently performed to avoid interference between different cushion block groups 30, and the reliability of the test samples can be improved while mass-producing the test samples.

[0050] In this embodiment, the step of clamping two cushion blocks 31 of the cushion block set 30 by the first core plate 11 and the second core plate 12 of the core plate set 10 includes:

[0051] The first core plate 11 and the second core plate 12 are connected by the elastic member 40 so that the first core plate 11 and the second core plate 12 clamp the pad block group 30. By connecting the first core plate 11 and the second core plate 12 by the elastic member 40, the tension of the elastic member 40 can be used to provide the first core plate 11 and the second core plate 12 with a force to clamp the pad block group 30, and in the process of pouring resin into the pouring groove 70 and curing the resin, the reliability of pouring and curing is improved, the resin is prevented from flowing out, and the success rate of preparing the sample plate 90 is improved.

[0052] like Figure 1 As shown, the steps of connecting the first core plate 11 and the second core plate 12 through the elastic member 40 include:

[0053] A first hook 51 is provided on the first core plate 11;

[0054] A second hook 52 is provided on the second core plate 12;

[0055] The two ends of the elastic member 40 are connected to the first hook 51 and the second hook 52 respectively.

[0056] like Figure 1 As shown, in the step of setting the first hook 51 on the first core plate 11, the two first hooks 51 are respectively attached to the two sides of the first core plate 11 in the second horizontal direction; in the step of setting the second hook 52 on the second core plate 12, the two second hooks 52 are respectively attached to the two sides of the second core plate 12 in the second horizontal direction; in the step of connecting the two ends of the elastic member 40 to the first hook 51 and the second hook 52, the two elastic members 40 are respectively arranged on the two sides of the first core plate 11 and the second core plate 12 in the second horizontal direction, and the first ends of the two elastic members 40 are respectively connected to the two first hooks 51, and the second ends of the two elastic members 40 are respectively connected to the two second hooks 52. The above-mentioned elastic member 40 has the advantages of low cost, simple structure and easy operation.

[0057] Specifically, the elastic member 40 is an elastic rope 41 .

[0058] In other embodiments, the step of connecting the first core material board 11 and the second core material board 12 through the elastic member 40 includes:

[0059] The elastic member is sleeved on the outer sides of the first core plate 11 and the second core plate 12, and the elastic member applies a tensioning force of the clamping pad group 30 to the first core plate 11 and the second core plate 12. The elastic member 40 has the advantages of low cost, simple structure and easy operation.

[0060] Specifically, the elastic member 40 is an elastic rope loop.

[0061] In this embodiment, the steps of cutting the sample plate 90 along the first horizontal direction to remove the spacer 31 and obtaining the test sample include:

[0062] Performing a first cutting operation and a second cutting operation on the sample plate 90 along a first horizontal direction;

[0063] The distance between the first cutting operation and the second cutting operation in the second horizontal direction is determined according to the preset sample thickness to obtain a test sample with the preset sample thickness. By adopting the above-mentioned cutting method, while removing the spacer 31, a test sample with the preset sample thickness can also be obtained, wherein the preset sample thickness can also be determined within a known range to control the defect size of the test sample in the second horizontal direction.

[0064] In this embodiment, between the step of clamping the two cushion blocks 31 of the cushion block group 30 by the first core plate 11 and the second core plate 12 of the core plate group 10 and the step of curing the resin after pouring the resin into the pouring groove 70, the processing method of the test sample further includes:

[0065] A top cloth 80 is provided above the first core material plate 11 , the second core material plate 12 , and the two spacers 31 of the spacer block set 30 .

[0066] In this embodiment, the step of placing the core plate set 10 on the substrate 20 includes:

[0067] Laying the substrate 20 on the sample preparation platform;

[0068] The core panel group 10 is laid on the substrate 20 .

[0069] In this embodiment, the substrate 20 is a lining cloth.

[0070] In this embodiment, the steps of pouring resin into the pouring tank 70 and then curing the resin to obtain the sample plate 90 include:

[0071] Lay release cloth, flow guide net, vacuum bag and other vacuum infusion auxiliary materials on the first core material board 11 and the second core material board 12 in sequence;

[0072] Vacuum infusing resin into the infusion tank 70;

[0073] The substrate 20 is heated until the resin in the pouring groove 70 is solidified. The resin is poured into the pouring groove 70 by vacuum pouring, which can improve the pouring efficiency and pouring effect of the resin. When the resin is heated and solidified, the bubbles in the solidified resin can be reduced, the defect singularity of the test sample is improved, and the reliability of the test result of the test sample is improved.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0075] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0076] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0077] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0078] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for processing a test specimen, characterized in that: The processing method of the test specimen comprises: Arranging a core material plate group (10) on a base (20), wherein the core material plate group (10) comprises a first core material plate (11) and a second core material plate (12) arranged at intervals in a first horizontal direction; A cushion block group (30) is arranged between the first core material plate (11) and the second core material plate (12), wherein the cushion block group (30) comprises two cushion blocks (31) arranged at intervals in a second horizontal direction perpendicular to the first horizontal direction, and the size of the cushion block (31) is obtained according to the defect size of the blade; The two cushion blocks (31) of the cushion block group (30) are clamped by the first core plate (11) and the second core plate (12) of the core plate group (10), so that the first core plate (11), the second core plate (12), the base (20) and the two cushion blocks (31) are surrounded to form a pouring groove (70); After pouring resin into the pouring groove (70), the resin is cured to obtain a sample plate (90); The sample plate (90) is cut along the first horizontal direction to remove the spacer (31) to obtain a test sample.

2. The method for processing a test specimen according to claim 1, characterized in that: The step of setting the size of the spacer block group (30) according to the blade defect size comprises: The blade defect size and the pad group (30) are both multiple; The sizes of the cushion blocks (31) in the plurality of cushion block groups (30) are obtained in a one-to-one correspondence with the plurality of blade defect sizes, and each of the cushion block groups (30) includes two cushion blocks (31).

3. The method for processing a test specimen according to claim 2, characterized in that: In the step of arranging the spacer block group (30) between the first core material plate (11) and the second core material plate (12): A plurality of the spacer block groups (30) are arranged at intervals between the first core plate (11) and the second core plate (12) along the second horizontal direction.

4. The method for processing a test specimen according to claim 2, characterized in that: In the step of arranging a core material plate group (10) on a substrate (20), the core material plate group (10) is multiple; In the step of laying the cushion block group (30) between the first core material board (11) and the second core material board (12), there are multiple cushion block groups (30), and the multiple cushion block groups (30) are respectively arranged between the first core material board (11) and the second core material board (12) of the multiple core material board groups (10).

5. The method for processing a test specimen according to claim 1, characterized in that: The step of clamping the two cushion blocks (31) of the cushion block group (30) by the first core plate (11) and the second core plate (12) of the core plate group (10) comprises: The first core plate (11) and the second core plate (12) are connected via an elastic member (40) so that the first core plate (11) and the second core plate (12) clamp the cushion block group (30).

6. The method for processing a test specimen according to claim 5, characterized in that: The step of connecting the first core material plate (11) and the second core material plate (12) via an elastic member (40) comprises: A first hook (51) is provided on the first core plate (11); A second hook (52) is provided on the second core plate (12); The two ends of the elastic member (40) are respectively connected to the first hook (51) and the second hook (52).

7. The method for processing a test specimen according to claim 6, characterized in that: In the step of arranging the first hooks (51) on the first core material plate (11), two of the first hooks (51) are respectively attached to two sides of the first core material plate (11) in the second horizontal direction; In the step of arranging the second hooks (52) on the second core material plate (12), two of the second hooks (52) are respectively attached to two sides of the second core material plate (12) in the second horizontal direction; In the step of connecting the two ends of the elastic member (40) to the first hook (51) and the second hook (52), the two elastic members (40) are respectively arranged on both sides of the first core material plate (11) and the second core material plate (12) in the second horizontal direction, and the first ends of the two elastic members (40) are respectively connected to the two first hooks (51), and the second ends of the two elastic members (40) are respectively connected to the two second hooks (52).

8. The method for processing a test specimen according to claim 5, characterized in that: The step of connecting the first core material plate (11) and the second core material plate (12) via an elastic member (40) comprises: An elastic member (40) is sleeved on the outer sides of the first core plate (11) and the second core plate (12), and the elastic member (40) applies a tensioning force to the first core plate (11) and the second core plate (12) to clamp the cushion block group (30).

9. The method for processing a test specimen according to claim 1, characterized in that: The step of cutting the sample plate (90) along the first horizontal direction to remove the spacer (31) to obtain a test sample comprises: Performing a first cutting operation and a second cutting operation on the sample plate (90) along the first horizontal direction; The distance between the first cutting operation and the second cutting operation in the second horizontal direction is determined according to a preset sample thickness to obtain a test sample with the preset sample thickness.

10. The method for processing a test specimen according to claim 1, characterized in that: Between the step of clamping the two cushion blocks (31) of the cushion block group (30) by the first core plate (11) and the second core plate (12) of the core plate group (10) and the step of pouring resin into the pouring groove (70) and then curing the resin, the processing method of the test specimen further includes: A top lining cloth (80) is arranged above the first core material plate (11), the second core material plate (12) and the two cushion blocks (31) of the cushion block group (30).

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