CN112034039A - Composite material wrinkle defect comparison test block and manufacturing method thereof - Google Patents
Composite material wrinkle defect comparison test block and manufacturing method thereof Download PDFInfo
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- 230000037303 wrinkles Effects 0.000 title claims abstract description 81
- 230000007547 defect Effects 0.000 title claims abstract description 52
- 239000002131 composite material Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 145
- 238000010586 diagram Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009659 non-destructive testing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
Abstract
The invention provides a composite material wrinkle defect comparison test block and a manufacturing method thereof, wherein the comparison test block is formed by sequentially superposing and pressing at least one upper combination layer, one intermediate layer and at least one lower combination layer; the upper combination layer comprises an upper laying layer and an upper offset sheet, the upper laying layer is provided with an upper notch, the upper offset sheet is positioned above the upper laying layer, one part of the upper offset sheet is laid on the upper laying layer, and the other part of the upper offset sheet is positioned in the upper notch; the lower combination layer comprises a lower laying layer and a lower offset sheet, the lower laying layer is provided with a lower notch, the lower offset sheet is positioned above the lower laying layer, one part of the lower offset sheet is laid on the lower laying layer, and the other part of the lower offset sheet is positioned in the lower notch. The composite material wrinkle defect comparison test block and the manufacturing method thereof can quickly and accurately manufacture the wrinkle defect comparison test block at any angle, reduce the manufacturing cost of the comparison test block and improve the manufacturing efficiency of the comparison test block.
Description
Technical Field
The invention relates to a composite material wrinkle defect comparison test block.
The invention also relates to a manufacturing method of the composite material wrinkle defect comparison test block.
Background
In the production, processing and application of the composite material, two problems are involved in the key influence on the performance attenuation of the material, namely defects generated in the production and manufacturing process and damages caused in the processing and using process. Wrinkles are one of the most significant defects in composite materials with respect to compressive strength and fatigue life. The wrinkles may be caused by a variety of reasons, such as mismatch in thermal expansion coefficients of the fibers, matrix and mold materials, unreasonable control of curing temperature and pressure, errors in ply profile and position accuracy, unreasonable ply sequence of materials, etc. that may cause wrinkles in the ply composite material.
In order to study the relationship between the characteristics of nondestructive testing signals of wrinkle defects and the sizes of wrinkles and the influence of wrinkles with different sizes on performance, a reference block with accurately controllable direction, position, coverage range and wrinkle angle needs to be manufactured. The invention provides a manufacturing process of a wrinkle defect comparison test block, which can quickly and accurately manufacture the wrinkle defect comparison test block along any layering direction, any position, coverage range and angle.
Disclosure of Invention
The invention aims to provide a composite material wrinkle defect comparison test block and a manufacturing method thereof, so as to achieve the purpose of quickly and accurately manufacturing the wrinkle defect comparison test block along any layering direction, any position, coverage range and angle.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a composite material wrinkle defect comparison test block, which is formed by sequentially superposing and pressing at least one upper combination layer, one intermediate layer and at least one lower combination layer; the upper combined layer comprises an upper laying layer and an upper offset sheet, the upper laying layer is provided with an upper notch, the upper offset sheet is positioned above the upper laying layer, one part of the upper offset sheet is laid on the upper laying layer, and the other part of the upper offset sheet is positioned in the upper notch; the lower combination layer comprises a lower laying layer and a lower offset sheet, the lower laying layer is provided with a lower gap, the lower offset sheet is located above the lower laying layer, one part of the lower offset sheet is laid on the lower laying layer, and the other part of the lower offset sheet is located in the lower gap.
In the technical scheme, due to the layer laying mode, due to the coupling phenomenon of the layer laying gap and the layer laying, wrinkles are generated after the layer laying is pressed and cured, and different wrinkles can be formed by adjusting the shapes and the offset displacements of the upper offset sheet and the lower offset sheet and the number of the superposed upper combination layer and lower combination layer.
Preferably, the upper offset plate, the upper notch, the lower offset plate and the lower notch are in the same shape, the upper notch and the lower offset plate are symmetrical by taking the middle layer as a symmetrical plane, and the lower notch and the upper offset plate are symmetrical by taking the middle layer as a symmetrical plane.
In the technical scheme, the wrinkles formed by the reference block are symmetrical and standardized wrinkles through symmetrical design.
Preferably, the areas of the upper offset sheet and the lower offset sheet in contact with the upper paving layer and the lower paving layer are the same in area.
In the technical scheme, the wrinkles formed by the reference block are symmetrical and standardized wrinkles through symmetrical design.
Preferably, the number of the upper combination layers and the number of the lower combination layers are multiple and the same, the multiple upper combination layers are sequentially stacked above the middle layer, and the multiple lower combination layers are sequentially stacked below the middle layer.
In the technical scheme, the height and the angle of the formed folds can be larger than those of a single layer by using the reference block obtained by overlapping a plurality of upper combination layers and lower combination layers.
The invention also provides a manufacturing method of the composite material wrinkle defect comparison test block, which comprises the following steps:
placing the upper offset sheet on the upper laying layer, wherein one part of the upper offset sheet is laid on the upper laying layer, and the other part of the upper offset sheet is positioned in the upper gap to form the upper combined layer;
placing the lower offset sheet on the lower laying layer, wherein one part of the lower offset sheet is laid on the lower laying layer, and the other part of the lower offset sheet is positioned in the lower notch to form the lower combined layer;
laying the upper combined layer above the middle layer and laying the lower combined layer below the middle layer;
and pressing and curing the upper combination layer, the middle layer and the lower combination layer.
In the technical scheme, the size, the trend and the coverage range of the fold angle of the reference block manufactured by the manufacturing method are accurate and controllable.
Preferably, the upper offset sheet and the upper layer of the upper combination layer are manufactured by the following steps:
and cutting the prepreg according to the shape of a preset upper notch, wherein the cut part of the prepreg is the upper offset sheet, and the rest part of the prepreg is the upper laying layer.
In the technical scheme, the upper offset sheet manufactured by the method is identical to the upper notch in shape completion, and the upper offset sheet and the upper paving layer are made of the same prepreg, so that the materials of the upper offset sheet and the upper paving layer are completely identical, and the reference block can highly simulate the wrinkle generation of the composite material in the actual production process.
Preferably, the lower bias sheet and the lower layer of the lower combination layer are manufactured by the following steps:
and cutting the prepreg according to the shape of a preset lower notch, wherein the cut part of the prepreg is the lower offset sheet, and the rest part of the prepreg is the lower laying layer.
In the technical scheme, the lower offset sheet manufactured by the method ensures that the shape of the lower offset sheet is the same as that of the lower notch, and the lower offset sheet and the lower laying layer are made of the same prepreg, so that the materials of the lower offset sheet and the lower laying layer are completely the same, and the reference test block can highly simulate the wrinkle generation of the composite material in the actual production process.
Preferably, the number of the upper combined layer and the lower combined layer is set according to the preset angle and height of the folds.
In the technical scheme, the number of the upper combination layer and the lower combination layer is set according to the angle and the height of the preset wrinkles, so that the wrinkle defect comparison test block with any angle can be quickly and accurately manufactured.
Preferably, the shapes of the upper offset sheet, the upper notch, the lower offset sheet and the lower notch are set according to the shape of a preset fold.
In the technical scheme, the shapes of the upper offset sheet, the upper notch, the lower offset sheet and the lower notch are set according to the shape of the preset wrinkle, so that the wrinkle defect comparison test block in any shape can be rapidly and accurately manufactured.
Preferably, the contact area of the upper offset sheet and the upper paving layer and the contact area of the lower offset sheet and the lower paving layer are arranged according to the length of a preset fold.
According to the technical scheme, the areas of the contact area of the upper offset sheet and the upper paving layer and the contact area of the lower offset sheet and the lower paving layer are set according to the preset length of the fold, so that the fold defect comparison test block with any coverage range can be quickly and accurately manufactured.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
the composite material wrinkle defect comparison test block and the manufacturing method thereof can rapidly and accurately manufacture the wrinkle defect comparison test block at any angle, reduce the manufacturing cost of the comparison test block, improve the manufacturing efficiency of the comparison test block, and the manufactured comparison test block can be used for nondestructive testing research, comparison and calibration of the wrinkle defect of the composite material and tolerance design of the influence of the undetectable wrinkle defect on the performance.
Drawings
FIG. 1 is a schematic view of a ply of a first embodiment of a composite wrinkle defect reference block of the present invention.
FIG. 2 is a schematic diagram of a step of manufacturing an upper layer and an upper offset sheet of the composite material wrinkle defect reference block shown in FIG. 1.
FIG. 3 is a schematic diagram of a step of manufacturing an under-laid layer and an under-bias sheet of the composite material wrinkle defect reference block shown in FIG. 1.
FIG. 4 is a schematic view of a ply of example two of a composite drape defect reference block of the present invention.
FIG. 5 is a schematic diagram of a step of manufacturing an upper layer and an upper bias sheet of the composite material wrinkle defect reference block shown in FIG. 4.
FIG. 6 is a schematic diagram of a step of manufacturing an under-laid layer and an under-bias sheet of the composite material wrinkle defect reference block shown in FIG. 4.
Fig. 7a and 7b are schematic diagrams illustrating wrinkles formed on the composite material wrinkle defect reference block according to the present invention.
FIG. 8a is a schematic diagram showing the ultrasonic detection result of the 5-10 degree fold angle of the composite material fold defect reference block.
FIGS. 8b and 8c are schematic diagrams illustrating ultrasonic detection results of 10-15 DEG fold angles of the composite material fold defect comparison test block.
FIG. 8d is a schematic diagram showing the results of ultrasonic testing of the composite material wrinkle defect comparison block at a wrinkle angle > 15 °.
Description of the reference numerals
The upper combination layer 1, the upper pavement layer 11, the upper offset sheet 12 and the upper notch 13; an intermediate layer 2; the lower combination layer 3, the lower layer 31, the lower offset sheet 32 and the lower notch 33; and (4) a prepreg.
Detailed Description
The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the invention.
Example one
Fig. 1 shows a first embodiment of a composite material wrinkle defect comparison block according to the present invention. The reference block is formed by laminating an upper combination layer 1, a middle layer 2 and a lower combination layer 3 in sequence and then pressing; the upper combination layer 1 comprises an upper layer 11 and an upper offset sheet 12, the upper layer 11 is provided with an upper notch 13, the upper offset sheet 12 is positioned above the upper layer 11, one part of the upper offset sheet 12 is paved on the upper layer 11, and the other part of the upper offset sheet 12 is positioned in the upper notch 13; the lower combination layer 3 comprises a lower layer 31 and a lower offset sheet 32, the lower layer 31 is provided with a lower notch 33, the lower offset sheet 32 is positioned above the lower layer 31, one part of the lower offset sheet 32 is laid on the lower layer 31, and the other part of the lower offset sheet 32 is positioned in the lower notch 33.
By the aid of the layering mode, due to coupling phenomena of layering gaps and layering superposition, the layering is pressed and cured to form wrinkles, and different wrinkles can be formed by adjusting shapes and offset displacements of the upper offset sheet 12 and the lower offset sheet 32 and the number of the superposed upper combination layer 1 and lower combination layer 3.
As shown in fig. 1, the length L of the wrinkle formed by the reference block can be adjusted by the offset displacement of the upper offset sheet 12 and the lower offset sheet 32, i.e., the size of the area where the upper offset sheet 12 contacts the upper mat 11 and the area where the lower offset sheet 32 contacts the lower mat 31. The height H of the wrinkles formed on the reference block and the relative angle θ between the wrinkles and the middle layer 2 can be achieved by adjusting the number of the upper combination layer 1 and the lower combination layer 3 to be stacked, and the thicknesses of the upper bias sheet 12, the upper pavement 11, the lower bias sheet 32 and the lower pavement 31.
In order to make the wrinkles formed on the reference block symmetrical and standardized, the shapes of the upper offset sheet 12, the upper notch 13, the lower offset sheet 32 and the lower notch 33 are the same, the upper notch 13 and the lower offset sheet 32 are symmetrical with the middle layer 2 as a symmetrical plane, and the lower notch 33 and the upper offset sheet 31 are symmetrical with the middle layer 2 as a symmetrical plane. And the areas of the contact area of the upper offset plate 12 and the upper paving layer 11 and the contact area of the lower offset plate 32 and the lower paving layer 31 are preferably ensured to be the same.
In order to make the reference block highly simulate the wrinkle generation of the composite material in the actual production process, the materials used for the upper combination layer 1, the middle layer 2 and the lower combination layer 3 are preferably the same.
The manufacturing method of the composite material wrinkle defect comparison test block comprises the following steps:
1) placing the upper offset sheet 12 on the upper layer 11, wherein one part of the upper offset sheet 12 is laid on the upper layer 11, and the other part of the upper offset sheet 12 is positioned in the upper gap 13 to form an upper combined layer 1;
2) placing a lower offset sheet 32 on the lower layer 31, wherein one part of the lower offset sheet 32 is laid on the lower layer 31, and the other part of the lower offset sheet 32 is positioned in a lower gap 33 to form a lower combined layer 3;
3) paving the upper combination layer 1 above the middle layer 2, and paving the lower combination layer 3 below the middle layer 2;
4) and pressing and curing the upper combination layer 1, the middle layer 2 and the lower combination layer 3.
The comparison test block manufactured by the manufacturing method has the advantages that the size, the trend and the coverage range of the fold angle are accurate and controllable.
As shown in fig. 2, the upper bias sheet 12 and the upper berth layer 11 of the upper combination layer 1 are manufactured by the following steps: the prepreg 4 is cut in the shape of a preset upper notch 13, the cut part of the prepreg 4 is an upper offset sheet 12, and the remaining part of the prepreg 4 is an upper layer 11.
The upper offset sheet 12 manufactured in the above manner ensures that the shape of the upper offset sheet is the same as that of the upper notch 13, and the upper offset sheet 12 and the upper spreading layer 11 are made of the same prepreg 4, so that the materials of the upper offset sheet 12 and the upper spreading layer 11 are completely the same, and the reference block can highly simulate the wrinkle generation of the composite material in the actual production process.
As shown in FIG. 3, the lower bias sheet 32 and the lower layer 31 of the lower combination layer 3 are manufactured by the following steps: the prepreg 4 is cut according to the shape of a preset undercut 33, the cut part of the prepreg 4 is a lower offset sheet 32, and the remaining part of the prepreg 4 is an under-lay layer 31.
The lower offset sheet 32 manufactured in the above manner ensures that the shape of the lower offset sheet is identical to that of the lower notch 33, and the lower offset sheet 32 and the lower laying layer 31 are made of the same prepreg 4, so that the materials of the lower offset sheet 32 and the lower laying layer 31 are completely identical, and the reference test block can highly simulate the wrinkle generation of the composite material in the actual production process.
And offsetting the cut upper offset sheet 12 by a certain distance, and overlapping the upper offset sheet with the upper layer 11 to form the upper combined layer 1. And offsetting the cut lower offset sheet 32 for a certain distance, and overlapping the lower offset sheet with the lower layer 31 to form the lower combined layer 3. The upper offset sheet 12 and the lower offset sheet 32 are offset equally and in opposite directions, so that the wrinkles formed on the reference block are symmetrical and standardized wrinkles. The offset distance of the upper offset sheet 12 and the lower offset sheet 32 determines the area of the contact area of the upper offset sheet 12 and the upper paving 11 and the area of the contact area of the lower offset sheet 32 and the lower paving 31, and the offset distance is set according to the preset length L of the fold. The shapes of the upper offset plate 12, the upper notch 13, the lower offset plate 32 and the lower notch 33 can be set according to the shape of the preset wrinkles.
During cutting of the upper offset sheet 12 and the lower offset sheet 32, the upper offset sheet 12 and the lower offset sheet 32 are preferably cut in a direction parallel to the fibers, so that the material properties of the upper offset sheet 12 and the lower offset sheet 32 can be ensured, and the wrinkle generation of the composite material in the actual production process can be highly simulated.
Example two
Fig. 4 shows a second example of the composite material wrinkle defect comparison block of the present invention. The basic structure of this example is the same as that of the first example, except that the reference block of the second example has a plurality of and the same number of upper combination layers 1 and lower combination layers 3, the plurality of upper combination layers 1 are sequentially stacked above the intermediate layer 2, and the plurality of lower combination layers 3 are sequentially stacked below the intermediate layer 2.
The height H of the formed wrinkles and the relative angle θ of the wrinkles to the intermediate layer 2 may be greater than a single layer ratio using a reference block obtained by stacking a plurality of upper and lower combination layers 1 and 3.
In the manufacturing process of the reference block, the number of the upper combination layer 1 and the lower combination layer 3 can be set according to the angle and the height of the preset wrinkles.
As shown in fig. 5, when a reference block is produced by stacking a plurality of upper buildup layers 1, a plurality of prepregs 4 are prepared, each prepreg 4 is cut in the shape of a predetermined upper notch 13, the cut part of the prepreg 4 is an upper offset sheet 12, and the remaining part of the prepreg 4 is an upper buildup layer 11. The upper decking layer 11, the upper biasing sheet 12 obtained for each prepreg 4 as a group, form an upper composite layer 1.
In order to improve the production efficiency of the reference block, a large sheet of composite prepreg can be used for the plurality of prepregs 4, and a plurality of cut pieces are used for cutting at the same time to obtain a plurality of upper layers 11 and upper bias pieces 12. The plurality of upper bias tabs 12 are then biased simultaneously and overlaid.
As shown in fig. 6, when a plurality of lower buildup layers 3 are stacked to produce a reference block, a plurality of prepregs 4 are prepared, each prepreg 4 is cut in the shape of a predetermined undercut 33, the cut part of the prepreg 4 is a lower offset sheet 32, and the remaining part of the prepreg 4 is an under-lay layer 31. The obtained under-lay 31, under-bias sheet 32 for each prepreg 4 as a group forms one lower composite layer 3.
In order to improve the production efficiency of the reference block, a large sheet of composite prepreg may be used for the plurality of prepregs 4, and a plurality of cut pieces may be used for cutting simultaneously to obtain a plurality of underlying layers 31 and under-bias pieces 32. The lower biasing tabs 32 are then biased simultaneously and overlaid.
The wrinkle schematic diagrams of the composite wrinkle defect reference block are shown in fig. 7a to 7 b. Fig. 8a to 8d are schematic diagrams showing the results of ultrasonic testing of different degrees of fold angles of the composite fold defect reference block. Ultrasonic detection proves that the fold angles of more than 5 degrees in the contrast test block can be clearly seen through analyzing the attenuation degree of the transmission ultrasonic signal, and the contrast test block with the fold angles of less than 5 degrees also has certain identification capability. The folds with different angles can generate scattering attenuation with different degrees to the ultrasonic signal, and the size range of the internal fold angle of the reference block can be related by analyzing the attenuation degree of the transmission ultrasonic signal.
According to the composite material wrinkle defect comparison test block and the manufacturing method thereof, the offset sheets with certain width are offset in the opposite directions along the symmetrical middle plane in the paving layer to form the coupling phenomenon of the paving layer gap and the paving layer superposition along the symmetrical middle plane, and then wrinkles are generated after curing; different fold angles are formed by adjusting the width of the offset sheets, the offset displacement and the number of the offset sheets. By the method, the wrinkle defect comparison test block with any angle can be rapidly and accurately manufactured, the manufacturing cost of the comparison test block is reduced, the manufacturing efficiency of the comparison test block is improved, the manufactured comparison test block can be used for nondestructive testing research, wrinkle defect comparison and calibration of composite materials, and tolerance design of the performance influence of the undetectable wrinkle defect.
Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of protection defined by the claims of the present invention, unless departing from the content of the technical solution of the present invention.
Claims (10)
1. A composite material wrinkle defect comparison test block is characterized in that the comparison test block is formed by sequentially overlapping and pressing at least one upper combination layer, an intermediate layer and at least one lower combination layer;
the upper combined layer comprises an upper laying layer and an upper offset sheet, the upper laying layer is provided with an upper notch, the upper offset sheet is positioned above the upper laying layer, one part of the upper offset sheet is laid on the upper laying layer, and the other part of the upper offset sheet is positioned in the upper notch;
the lower combination layer comprises a lower laying layer and a lower offset sheet, the lower laying layer is provided with a lower gap, the lower offset sheet is located above the lower laying layer, one part of the lower offset sheet is laid on the lower laying layer, and the other part of the lower offset sheet is located in the lower gap.
2. The composite material wrinkle defect comparison block as claimed in claim 1, wherein: the upper offset sheet, the upper notch, the lower offset sheet and the lower notch are in the same shape, the upper notch and the lower offset sheet are symmetrical by taking the middle layer as a symmetrical plane, and the lower notch and the upper offset sheet are symmetrical by taking the middle layer as a symmetrical plane.
3. The composite material wrinkle defect comparison block as claimed in claim 1 or 2, wherein: the areas of the upper offset pieces, which are in contact with the upper paving layer, and the areas of the lower offset pieces, which are in contact with the lower paving layer, are the same.
4. The composite material wrinkle defect comparison block as claimed in claim 1, wherein: the number of the upper combination layers and the number of the lower combination layers are multiple and the same, the upper combination layers are sequentially superposed above the middle layer, and the lower combination layers are sequentially superposed below the middle layer.
5. A method for manufacturing a composite material wrinkle defect comparison test block as claimed in any one of claims 1 to 4, characterized by comprising the following steps:
placing the upper offset sheet on the upper laying layer, wherein one part of the upper offset sheet is laid on the upper laying layer, and the other part of the upper offset sheet is positioned in the upper gap to form the upper combined layer;
placing the lower offset sheet on the lower laying layer, wherein one part of the lower offset sheet is laid on the lower laying layer, and the other part of the lower offset sheet is positioned in the lower notch to form the lower combined layer;
laying the upper combined layer above the middle layer and laying the lower combined layer below the middle layer;
and pressing and curing the upper combination layer, the middle layer and the lower combination layer.
6. The method for manufacturing the composite material wrinkle defect reference block as claimed in claim 5, wherein the upper offset sheet and the upper layer of the upper combination layer are manufactured by the following steps:
and cutting the prepreg according to the shape of a preset upper notch, wherein the cut part of the prepreg is the upper offset sheet, and the rest part of the prepreg is the upper laying layer.
7. The method for manufacturing the composite material wrinkle defect comparison test block as claimed in claim 5, wherein the under bias sheet and the under layer of the lower combination layer are manufactured by the following steps:
and cutting the prepreg according to the shape of a preset lower notch, wherein the cut part of the prepreg is the lower offset sheet, and the rest part of the prepreg is the lower laying layer.
8. The method for manufacturing the composite material wrinkle defect reference block as claimed in claim 5, wherein: and the number of the upper combination layer and the lower combination layer is set according to the angle and the height of a preset fold.
9. The method for manufacturing the composite material wrinkle defect reference block as claimed in claim 5, wherein: the shapes of the upper offset sheet, the upper notch, the lower offset sheet and the lower notch are set according to the shape of a preset fold.
10. The method for manufacturing the composite material wrinkle defect reference block as claimed in claim 5, wherein: the contact area of the upper offset sheet and the upper paving layer and the contact area of the lower offset sheet and the lower paving layer are arranged according to the length of a preset fold.
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2019
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