CN112034039B - Composite material fold defect reference block and manufacturing method thereof - Google Patents
Composite material fold defect reference block and manufacturing method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 54
- 230000007547 defect Effects 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000010030 laminating Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 115
- 230000037303 wrinkles Effects 0.000 description 25
- 239000000463 material Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram 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
- 239000000835 fiber Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009659 non-destructive testing Methods 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
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
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- 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
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Abstract
The invention provides a composite material fold defect reference block and a manufacturing method thereof, wherein the reference block is formed by sequentially superposing 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 paving layer and an upper offset sheet, the upper paving layer is provided with an upper notch, the upper offset sheet is positioned above the upper paving layer, one part of the upper offset sheet is paved on the upper paving layer, and the other part of the upper offset sheet is positioned in the upper notch; the lower combined layer comprises a lower paving layer and a lower offset sheet, the lower paving layer is provided with a lower notch, the lower offset sheet is positioned above the lower paving layer, one part of the lower offset sheet is paved on the lower paving layer, and the other part of the lower offset sheet is positioned in the lower notch. The composite material fold defect reference block and the manufacturing method thereof can rapidly and accurately manufacture the fold defect reference block with any angle, reduce the manufacturing cost of the reference block and improve the manufacturing efficiency of the reference block.
Description
Technical Field
The invention relates to a composite material fold defect comparison test block.
The invention also relates to a manufacturing method of the composite material fold defect reference block.
Background
In the production, processing and application of composite materials, two problems have critical influence on the performance attenuation of the materials, namely, the defects generated in the production and manufacturing process and the damage caused in the processing and use processes. Wrinkles are one of the most significant defects in the composite material, both in terms of compressive strength and fatigue life. The wrinkles may occur due to various causes, such as mismatching of thermal expansion coefficients of fibers, matrix and mold materials, unreasonable control of curing temperature and pressure, errors in layup profile and positional accuracy, unreasonable layup sequence of materials, etc., which may result in wrinkles in the layup composite.
In order to study the relation between the characteristics of nondestructive detection signals of the fold defects and the size of the folds and the influence of the folds with different sizes on the performance, a reference block with accurately controllable direction, position, coverage and fold angle is required to be manufactured. The invention provides a manufacturing process of a fold defect reference block, which can rapidly and accurately manufacture the fold defect reference block along any layering direction, any position, any coverage range and any angle.
Disclosure of Invention
The invention aims to provide a composite material fold defect reference block and a manufacturing method thereof, so as to achieve the aim of rapidly and accurately manufacturing the fold defect reference block along any layering direction, any position, any coverage range and any angle.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The invention provides a composite material fold defect reference block, which is formed by sequentially superposing and pressing at least one upper combination layer, a middle layer and at least one lower combination layer; the upper combined layer comprises an upper paving layer and an upper offset sheet, the upper paving layer is provided with an upper notch, the upper offset sheet is positioned above the upper paving layer, one part of the upper offset sheet is paved on the upper paving layer, and the other part of the upper offset sheet is positioned in the upper notch; the lower combined layer comprises a lower paving layer and a lower offset sheet, the lower paving layer is provided with a lower notch, the lower offset sheet is positioned above the lower paving layer, one part of the lower offset sheet is paved on the lower paving layer, and the other part of the lower offset sheet is positioned in the lower notch.
In the technical scheme, due to the coupling phenomenon of the layering gap and layering superposition, folds are generated after the layering is pressed and solidified, and different folds can be formed by adjusting the shapes and the offset displacement of the upper offset sheet and the lower offset sheet and the number of the overlapped upper combined layers and lower combined layers.
Preferably, the upper offset piece, the upper notch, the lower offset piece and the lower notch have the same shape, the upper notch and the lower offset piece are symmetrical with the middle layer as a symmetrical plane, and the lower notch and the upper offset piece are symmetrical with the middle layer as a symmetrical plane.
In the technical scheme, the folds formed by the reference block are symmetrical and standardized folds through symmetrical design.
Preferably, the area of the upper bias sheet in contact with the upper ply and the area of the lower bias sheet in contact with the lower ply are the same.
In the technical scheme, the folds formed by the reference block are symmetrical and standardized folds through symmetrical design.
Preferably, the number of the upper combined layers and the number of the lower combined layers are multiple and the same, the multiple upper combined layers are sequentially overlapped above the middle layer, and the multiple lower combined layers are sequentially overlapped 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 comparison test block obtained by superposing a plurality of upper combination layers and lower combination layers.
The invention also provides a manufacturing method of the composite material fold defect reference block, which comprises the following steps:
Placing the upper bias sheet on the upper layer, wherein one part of the upper bias sheet is laid on the upper layer, and the other part of the upper bias sheet is positioned in the upper notch to form the upper combined layer;
Placing the lower bias sheet on the lower layer, wherein one part of the lower bias sheet is laid on the lower layer, and the other part of the lower bias sheet is positioned in the lower notch to form the lower combined layer;
The upper combined layer is paved above the middle layer, and the lower combined layer is paved below the middle layer;
And laminating and curing the upper combined layer, the middle layer and the lower combined layer.
In the technical scheme, the comparison test block manufactured by the manufacturing method has the advantages that the fold angle, the trend and the coverage range are accurately controllable.
Preferably, the upper bias sheet and the upper paving layer of the upper combined layer are manufactured by the following steps:
And cutting the prepreg according to a preset upper notch shape, 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 in the mode ensures that the shape of the upper offset sheet is identical to that of the upper notch, and the upper offset sheet and the upper layer are made of the same prepreg, so that the upper offset sheet and the upper layer are completely identical in material, and the comparison test block can highly simulate the generation of wrinkles of the composite material in the actual production process.
Preferably, the lower bias sheet of the lower combined layer, the lower layup, is made by the steps of:
and cutting the prepreg according to a preset shape of a 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 mode ensures that the shape of the lower offset sheet is identical to 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 identical, and the comparison test block can highly simulate the generation of wrinkles 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 combined layers and the lower combined layers is set according to the preset angles and the preset heights of the folds, so that the fold defect comparison test block with any angle can be rapidly 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 preset shape of the 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 preset shape of the fold, so that the fold defect comparison test block with any shape can be rapidly and accurately manufactured.
Preferably, the area where the upper bias sheet contacts the upper ply and the area where the lower bias sheet contacts the lower ply are set according to a preset length of the wrinkles.
According to the technical scheme, according to the length of the preset folds, the areas of the upper offset sheet and the upper layer and the areas of the lower offset sheet and the lower layer are set, so that the fold defect comparison test block with any coverage area can be manufactured rapidly and accurately.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that:
The composite material fold defect reference block and the manufacturing method thereof can rapidly and accurately manufacture the fold defect reference block with any angle, reduce the manufacturing cost of the reference block, improve the manufacturing efficiency of the reference block, and the manufactured reference block can be used for nondestructive testing research, and the tolerance design of the fold defect on the performance can not be detected in the comparison and calibration of the composite material fold defect.
Drawings
FIG. 1 is a schematic lay-up of a first embodiment of a composite fold defect reference block of the present invention.
FIG. 2 is a schematic illustration of the steps for making the upper lay-up, upper bias sheet of the composite fold defect reference block shown in FIG. 1.
FIG. 3 is a schematic illustration of the steps for making the lower lay-up and lower offset sheets of the composite fold defect reference block shown in FIG. 1.
FIG. 4 is a schematic representation of lay-up of a second embodiment of a composite fold defect reference block according to the present invention.
FIG. 5 is a schematic illustration of the steps for making the upper lay-up, upper bias sheet of the composite fold defect reference block shown in FIG. 4.
FIG. 6 is a schematic illustration of the steps for making the lower lay-up, lower bias tabs of the composite fold defect reference block shown in FIG. 4.
Fig. 7a and 7b are schematic diagrams of wrinkles formed by the composite material wrinkle defect reference block according to the present invention.
FIG. 8a is a schematic view showing ultrasonic detection results of 5-10 ° fold angles of a comparative test block for fold defects of a composite material according to the present invention.
Fig. 8b and 8c are schematic diagrams showing ultrasonic detection results of 10-15 ° fold angles of the composite material fold defect reference block according to the present invention.
FIG. 8d is a graph showing ultrasonic inspection results of a comparison block of the inventive composite material fold defect with a fold angle of > 15 °.
Description of the reference numerals
An upper combined layer 1, an upper paving layer 11, an upper offset sheet 12 and an upper notch 13; an intermediate layer 2; lower combined layer 3, lower layup 31, lower offset sheet 32, lower gap 33; prepreg 4.
Detailed Description
The present invention will be further described with reference to specific embodiments and drawings, in which more details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent that the present invention can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present invention, and therefore should not be construed to limit the scope of the present invention in terms of the content of this specific embodiment.
Example 1
FIG. 1 shows a first embodiment of a composite fold defect reference block according to the present invention. The reference block is formed by sequentially superposing and pressing an upper combination layer 1, an intermediate layer 2 and a lower combination layer 3; the upper combined layer 1 comprises an upper paving layer 11 and an upper offset sheet 12, wherein the upper paving layer 11 is provided with an upper notch 13, the upper offset sheet 12 is positioned above the upper paving layer 11, one part of the upper offset sheet 12 is paved on the upper paving layer 11, and the other part of the upper offset sheet 12 is positioned in the upper notch 13; the lower combined 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 paved on the lower layer 31, and the other part of the lower offset sheet 32 is positioned in the lower notch 33.
By the above-mentioned layering mode, because of the coupling phenomenon of layering gap and layering superposition, the layering generates the fold after pressing solidification, and different folds can be formed by adjusting the shape and offset displacement of the upper offset sheet 12 and the lower offset sheet 32 and the number of the upper combined layer 1 and the lower combined layer 3 overlapped.
As shown in fig. 1, the length L of the fold formed in the reference block can be adjusted by the offset displacement of the upper offset sheet 12 and the lower offset sheet 32, that is, 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 by the reference block and the relative angle θ of the wrinkles and the intermediate layer 2 can be achieved by adjusting the number of upper and lower combined layers 1 and 3 and the thicknesses of the upper and lower bias sheets 12 and 11 and 32 and the lower bias sheet 31.
In order to make the wrinkles formed by the reference block be symmetrical and standardized wrinkles, the shapes of the upper offset piece 12, the upper notch 13, the lower offset piece 32 and the lower notch 33 are the same, the upper notch 13 and the lower offset piece 32 are symmetrical with the middle layer 2 as a symmetrical plane, and the lower notch 33 and the upper offset piece 12 are symmetrical with the middle layer 2 as a symmetrical plane. And, the areas of the areas where the upper bias sheet 12 and the upper ply 11 and the lower bias sheet 32 and the lower ply 31 are in contact are also preferably the same.
In order to enable the reference block to highly simulate the generation of wrinkles in the actual production process of the composite material, the materials used for the upper combination layer 1, the middle layer 2 and the lower combination layer 3 are preferably the same materials.
The manufacturing method of the composite material fold defect reference block comprises the following steps:
1) Placing an upper offset sheet 12 on the upper paving layer 11, wherein one part of the upper offset sheet 12 is paved on the upper paving layer 11, and the other part of the upper offset sheet 12 is positioned in the upper notch 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 paved on the lower layer 31, and the other part of the lower offset sheet 32 is positioned in the lower notch 33 to form a lower combined layer 3;
3) The upper combined layer 1 is paved above the middle layer 2, and the lower combined layer 3 is paved below the middle layer 2;
4) And pressing and curing the upper combined layer 1, the middle layer 2 and the lower combined 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 accurately controllable.
As shown in fig. 2, the upper bias sheet 12 and the upper ply 11 of the upper composite layer 1 are manufactured by: the prepreg 4 is cut in a predetermined shape of the upper notch 13, the cut portion of the prepreg 4 is the upper bias sheet 12, and the remaining portion of the prepreg 4 is the upper ply 11.
The upper offset sheet 12 manufactured in the mode ensures that the shape of the upper offset sheet 12 is identical to that of the upper notch 13, and the upper offset sheet 12 and the upper layer 11 are made of the same prepreg 4, so that the upper offset sheet 12 and the upper layer 11 are completely identical in material, and the comparison block can highly simulate the generation of wrinkles of the composite material in the actual production process.
As shown in fig. 3, the lower bias sheet 32, lower ply 31 of the lower combined ply 3 is made by the steps of: the prepreg 4 is cut in a predetermined shape of the lower notch 33, the cut portion of the prepreg 4 is the lower bias sheet 32, and the remaining portion of the prepreg 4 is the lower lay-up 31.
The lower offset piece 32 manufactured in the mode ensures that the shape of the lower gap 33 is identical to that of the lower gap, and the lower offset piece 32 and the lower layer 31 are made of the same prepreg 4, so that the materials of the lower offset piece 32 and the lower layer 31 are identical, and the comparison block can highly simulate the generation of wrinkles of the composite material in the actual production process.
The cut upper offset sheet 12 is offset by a certain distance and overlapped with the upper layer 11 to form the upper combined layer 1. The cut lower offset sheet 32 is offset by a certain distance and overlapped with the lower ply 31 to form the lower combined layer 3. The offset distances of the upper offset sheet 12 and the lower offset sheet 32 are equal, and the offset directions are opposite, so that the folds formed by the reference block are symmetrical and standardized folds. The offset distances of the upper offset sheet 12 and the lower offset sheet 32, which are set according to the preset pleat length L, determine the areas of the areas where the upper offset sheet 12 contacts the upper mat 11 and the areas where the lower offset sheet 32 contacts the lower mat 31. The upper offset piece 12, the upper notch 13, the lower offset piece 32, and the lower notch 33 may be formed according to a predetermined shape of the fold.
In the process of cutting 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 as to ensure the material performance of the upper offset sheet 12 and the lower offset sheet 32, and the generation of wrinkles of the composite material in the actual production process can be highly simulated.
Example two
FIG. 4 shows a second embodiment of a composite fold defect reference block according to the present invention. The basic structure of the present embodiment is the same as that of the first embodiment, except that the number of the upper combined layers 1 and the lower combined layers 3 is the same in the second embodiment, the upper combined layers 1 are sequentially stacked above the intermediate layer 2, and the lower combined 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 and the intermediate layer 2 can be larger than the single layer ratio using the reference block obtained by stacking the plurality of upper and lower combined layers 1, 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 preset angle and the preset height of the folds.
As shown in fig. 5, when a plurality of upper composite layers 1 are stacked to manufacture a reference block, a plurality of prepregs 4 are prepared, each prepreg 4 is cut in accordance with a predetermined shape of an upper notch 13, the cut portion of the prepreg 4 is an upper bias sheet 12, and the remaining portion of the prepreg 4 is an upper ply 11. The upper lay-up 11, upper bias sheet 12 obtained for each prepreg 4 forms an upper composite layer 1 as a group.
In order to improve the manufacturing efficiency of the reference block, a large composite prepreg may be used for the prepregs 4, and a plurality of cut sheets may be used for cutting at the same time, so as to obtain a plurality of upper plies 11 and upper offset sheets 12. The plurality of upper bias plates 12 are then biased simultaneously and then laid.
As shown in fig. 6, when a plurality of lower combined layers 3 are stacked to manufacture a reference block, a plurality of prepregs 4 are prepared, each prepreg 4 is cut in accordance with a predetermined shape of the lower notch 33, the cut portion of the prepreg 4 is the lower bias sheet 32, and the remaining portion of the prepreg 4 is the lower layup 31. The lower lay-up 31, lower bias sheet 32 obtained for each prepreg 4 forms a lower composite layer 3 as a group.
In order to improve the manufacturing efficiency of the reference block, a large composite prepreg may be used for the plurality of prepregs 4, and a plurality of cut sheets may be used for cutting at the same time, and a plurality of lower plies 31 and lower bias sheets 32 may be obtained at the same time. The plurality of lower bias plates 32 are then biased simultaneously and then laid.
The schematic diagrams of the wrinkles of the composite material wrinkles defect reference block are shown in fig. 7a to 7 b. Fig. 8a to 8d are schematic diagrams showing ultrasonic detection results of fold angles of different degrees of the above-mentioned composite fold defect reference block. Ultrasonic detection proves that the fold angles of more than 5 degrees in the reference block can be clearly seen through analyzing the attenuation degree of the transmitted ultrasonic signals, and the reference block with the fold angles of less than 5 degrees can also have certain identification capability. Wrinkles of different angular sizes produce different degrees of scattering attenuation to the ultrasound signal, which can be correlated to the size range of the internal wrinkle angle of the reference block by analyzing the attenuation of the transmitted ultrasound signal.
According to the composite material fold defect comparison test block and the manufacturing method thereof, offset sheets with certain widths are offset in opposite directions along the symmetrical middle plane in the layers, so that a coupling phenomenon of layering gaps along the symmetrical middle plane and layering superposition is formed, and folds are generated after solidification; different fold angles are formed by adjusting the width of the offset sheets, the offset displacement and the number of the offset sheets. The invention can rapidly and accurately manufacture the wrinkle defect reference block with any angle, reduce the manufacturing cost of the reference block, improve the manufacturing efficiency of the reference block, and the manufactured reference block can be used for nondestructive testing research, comparison and calibration of the wrinkle defect of the composite material and tolerance design of the performance influence of the wrinkle defect can not be detected.
While the invention has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the invention, as will occur to those skilled in the art, without departing from the spirit and scope of the invention. Any modifications, equivalent variations and modifications of the above embodiments according to the technical substance of the present invention fall within the scope of protection defined by the claims.
Claims (10)
1. The composite material fold defect comparison test block is characterized by being formed by laminating at least one upper combination layer, at least one middle layer and at least one lower combination layer in sequence and then pressing;
The upper combined layer comprises an upper paving layer and an upper offset sheet, the upper paving layer is provided with an upper notch, the upper offset sheet is positioned above the upper paving layer, one part of the upper offset sheet is paved on the upper paving layer, and the other part of the upper offset sheet is positioned in the upper notch;
the lower combined layer comprises a lower paving layer and a lower offset sheet, the lower paving layer is provided with a lower notch, the lower offset sheet is positioned above the lower paving layer, one part of the lower offset sheet is paved on the lower paving layer, and the other part of the lower offset sheet is positioned in the lower notch;
the bias directions of the upper bias piece and the lower bias piece are opposite.
2. The composite fold defect reference block of claim 1, wherein: the upper offset piece, the upper notch, the lower offset piece and the lower notch are identical in shape, the upper notch is symmetrical with the lower offset piece by taking the middle layer as a symmetrical plane, and the lower notch is symmetrical with the upper offset piece by taking the middle layer as a symmetrical plane.
3. The composite fold defect reference block of claim 1 or 2, wherein: a region where the upper bias sheet contacts the upper layer the area of the area where the lower bias sheet contacts the lower ply is the same.
4. The composite fold defect reference block of claim 1, wherein: the number of the upper combined layers and the number of the lower combined layers are multiple and the same, the upper combined layers are sequentially overlapped above the middle layer, and the lower combined layers are sequentially overlapped below the middle layer.
5. A method of manufacturing a composite fold defect reference block according to any one of claims 1 to 4, comprising the steps of:
Placing the upper bias sheet on the upper layer, wherein one part of the upper bias sheet is laid on the upper layer, and the other part of the upper bias sheet is positioned in the upper notch to form the upper combined layer;
Placing the lower bias sheet on the lower layer, wherein one part of the lower bias sheet is laid on the lower layer, and the other part of the lower bias sheet is positioned in the lower notch to form the lower combined layer;
The upper combined layer is paved above the middle layer, and the lower combined layer is paved below the middle layer;
And laminating and curing the upper combined layer, the middle layer and the lower combined layer.
6. The method of manufacturing a composite fold defect reference block of claim 5, wherein the upper bias sheet, upper layup of the upper composite layer is made by:
And cutting the prepreg according to a preset upper notch shape, 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 of manufacturing a composite fold defect reference block of claim 5, wherein the lower bias sheet, lower layup of the lower combined layer is made by:
and cutting the prepreg according to a preset shape of a 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 of manufacturing a composite fold defect reference block of claim 5, wherein: the number of the upper combined layers and the lower combined layers is set according to the preset angles and heights of the folds.
9. The method of manufacturing a composite fold defect reference block of claim 5, wherein: the upper offset piece, the upper notch, the lower offset piece and the lower notch are arranged according to the preset shape of the fold.
10. The method of manufacturing a composite fold defect reference block of claim 5, wherein: the areas of the upper offset sheet and the upper paving layer and the areas of the lower offset sheet and the lower paving layer are arranged according to the preset length of the folds.
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| CN201910481683.XA CN112034039B (en) | 2019-06-04 | 2019-06-04 | Composite material fold defect reference block and manufacturing method thereof |
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| CN201910481683.XA CN112034039B (en) | 2019-06-04 | 2019-06-04 | Composite material fold defect reference block and manufacturing method thereof |
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| GB2447964B (en) * | 2007-03-29 | 2012-07-18 | Gurit Uk Ltd | Moulding material |
| CN203479768U (en) * | 2013-10-14 | 2014-03-12 | 江阴市至卓技术服务有限公司 | Fold defect reference block |
| CN105172163B (en) * | 2015-08-13 | 2018-03-20 | 武汉理工大学 | A kind of method for building the controllable uniformity defect of composite |
| US11255825B2 (en) * | 2016-10-31 | 2022-02-22 | The Boeing Company | Wrinkle characterization and performance prediction for composite structures |
| US20180172645A1 (en) * | 2016-12-20 | 2018-06-21 | The Boeing Company | Methods for creating a wrinkle reference standard for use in inspecting composite structures |
| US10744727B2 (en) * | 2017-03-21 | 2020-08-18 | Textron Innovations Inc. | Methods of making a specimen with a predetermined wrinkle defect |
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| Title |
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| 内嵌褶皱对自动铺丝层合板构件拉伸性能的影响;李韦清等;固体火箭技术;第41卷(第5期);621-626 * |
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