CN112730064B - Method for testing tensile breaking strength of carbon fiber fabric - Google Patents
Method for testing tensile breaking strength of carbon fiber fabric Download PDFInfo
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- CN112730064B CN112730064B CN202011587829.8A CN202011587829A CN112730064B CN 112730064 B CN112730064 B CN 112730064B CN 202011587829 A CN202011587829 A CN 202011587829A CN 112730064 B CN112730064 B CN 112730064B
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- 239000004744 fabric Substances 0.000 title claims abstract description 90
- 238000012360 testing method Methods 0.000 title claims abstract description 52
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 21
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 239000002390 adhesive tape Substances 0.000 claims abstract description 14
- 239000003292 glue Substances 0.000 claims abstract description 9
- 238000007598 dipping method Methods 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 5
- 238000010998 test method Methods 0.000 claims abstract 2
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 claims description 10
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 229960001124 trientine Drugs 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000009941 weaving Methods 0.000 abstract description 2
- 239000002759 woven fabric Substances 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 1
- 239000002356 single layer 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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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
- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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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
- G01N1/30—Staining; Impregnating ; Fixation; Dehydration; Multistep processes for preparing samples of tissue, cell or nucleic acid material and the like for analysis
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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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- General Physics & Mathematics (AREA)
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Abstract
A test method for tensile breaking strength of a carbon fiber fabric comprises the steps of sticking a frame with a transparent adhesive tape to obtain a fabric to be tested, cutting the fabric to be tested along the center line of the adhesive tape, and sampling; sampling, dipping in glue and curing, and then cutting out a sample piece, wherein the length direction is the fiber direction; and gluing the reinforcing sheets at two ends of the sample sheet, wherein each group of tests has at least 5 effective data, and calculating the average value as the tensile breaking strength of the fabric. The method can ensure the consistency of the test sample strip and the heredity of the fiber tension during weaving, and can also ensure that the fiber is not easy to be pinched off and slide during testing, thereby furthest reflecting the inherent characteristics of the fabric. The method is simple and easy to implement, the tools and materials are easy to obtain, and the method has high economical efficiency and popularization and is very suitable for testing the tensile fracture strength of the carbon fiber fabrics with various structural forms, such as woven fabrics, multi-axial fabrics and the like.
Description
Technical Field
The invention relates to the technical field of new material detection, in particular to a method for testing tensile breaking strength of a carbon fiber fabric.
Background
The tensile breaking strength of the fabric of the carbon fiber is difficult to test due to the ultrahigh specific strength and modulus and the smoother fiber surface. For example, the method introduced in GB/T3923.1, when in direct test, the clamping of a universal testing machine test chuck is not clamped, or the clamping is broken, or the fiber slips, and the fiber cannot be cooperatively stressed, so that the test data is low, and the tensile property and the fiber tension uniformity of the fabric cannot be truly reflected, so that the standard directly indicates that the method is not suitable for the test of the carbon fiber fabric. For example, the method introduced in GB/T7689.5, the wettability of glue to fabrics is difficult to control, if the viscosity of the glue is high, the wettability of fibers is poor, it is difficult to ensure that each fiber is fully infiltrated, and tensile fracture strength data is low due to fiber slippage during testing; if the viscosity of the glue is low and the fiber wettability is good, the glue cannot be infiltrated into a fabric area which does not need gum dipping, so that the consistency of the state of the test sample strip is difficult to ensure.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a method for testing the tensile breaking strength of a carbon fiber fabric, which can embody the tensile strength and the tension uniformity of the fabric as much as possible.
The invention aims to solve the technical problem by adopting the following technical scheme, and the method for testing the tensile breaking strength of the carbon fiber fabric is characterized by comprising the following steps of:
1) Sampling: naturally unreeling a carbon fiber fabric for a certain length from a reel on a flat table top, keeping the original state of the fabric as far as possible without the external force during unreeling, sticking the fabric to be tested by using a transparent adhesive tape with the thickness of 5-30 mm to form a frame, fully sticking the adhesive tape to the fabric by using strong pressing, and then cutting the fabric to be tested along the central line of the adhesive tape by using scissors;
2) Gum dipping: preparing a flat plate, wherein the size of the flat plate is larger than that of the fabric to be tested, the natural warping degree is smaller than 1mm, demolding cloth is pasted on one side of the flat plate, the taken-off fabric to be tested is flatly paved on one side, to which the demolding cloth is pasted, of the flat plate, and then liquid epoxy resin glue is uniformly brushed on the fabric to be tested once;
3) And (3) curing: putting the dipped fabric to be tested and the flat plate into an oven together for curing for 30-90 min at 40-120 ℃, and taking out the hardened fabric after cooling to room temperature;
4) Cutting: cutting a rectangular sample piece on the hardened fabric to be tested, wherein the length direction is the fiber direction;
5) Gluing the reinforcing sheet: respectively sticking reinforcing sheets to two ends of the sample sheet to enable two ends of the fabric sample sheet to be positioned in the middle of the reinforcing sheet and to be in a clamped state, and ensuring that the effective sample sheet length in the middle of the reinforcing sheet is not less than 200mm after bonding and curing;
6) And (3) testing: and clamping the hardened fabric glued with the reinforcing sheet to the middle of a test chuck of a universal testing machine, locking, stretching the test sample at a constant speed until the test sample is broken, recording the maximum force of the test sample when the test sample is broken, wherein each group of tests has at least 5 effective data, and calculating the average value as the tensile breaking strength of the fabric.
The technical problem to be solved by the invention can be further realized by the following technical scheme, wherein the liquid epoxy resin adhesive in the step 2) is a composition of E51 and triethylene tetramine, and the proportion of the liquid epoxy resin adhesive is E51: triethylene tetramine =10g, and is prepared in situ before use.
The technical problem to be solved by the invention can be further realized by the following technical scheme that the reinforcing sheet in the step 5) is made of aluminum alloy or glass fiber reinforced plastic and has the thickness of 1-3 mm.
Compared with the prior art, the invention adopts the procedures of sampling, gum dipping, curing, cutting, reinforcing and the like, can ensure the consistency of the test sample strips and the heredity of the fiber tension during weaving, and can also ensure that the fibers are not easy to be pinched off and slide during testing, thereby reflecting the inherent characteristics of the fabric to the maximum extent. The method is simple and easy to implement, the tools and materials are easy to obtain, and the method has high economical efficiency and popularization and is very suitable for testing the tensile fracture strength of the carbon fiber fabrics with various structural forms, such as woven fabrics, multi-axial fabrics and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, and in order to make those skilled in the art understand the present invention further, the embodiments of the present invention will be described in detail and fully with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for testing tensile breaking strength of carbon fiber fabric,
1) Sampling: naturally unreeling a carbon fiber fabric for a certain length from a reel on a flat table top, keeping the original state of the fabric as far as possible without the external force during unreeling, sticking the fabric to be tested by using a transparent adhesive tape with the thickness of 5-30 mm to form a frame, fully sticking the adhesive tape to the fabric by using strong pressing, and then cutting the fabric to be tested along the central line of the adhesive tape by using scissors;
2) Gum dipping: preparing a flat plate, wherein the size of the flat plate is larger than that of the fabric to be tested, the natural warping degree is smaller than 1mm, demolding cloth is pasted on one side of the flat plate, the taken-off fabric to be tested is flatly paved on one side, to which the demolding cloth is pasted, and then liquid epoxy resin glue is uniformly brushed on the fabric to be tested once;
3) And (3) curing: putting the dipped fabric to be tested and the flat plate into an oven together, curing for 30-90 min at 40-120 ℃, cooling to room temperature, and taking out the hardened fabric;
4) Cutting: cutting a rectangular sample sheet on the hardened fabric to be tested, wherein the length direction is the fiber direction;
5) Gluing the reinforcing sheet: respectively sticking reinforcing sheets to two ends of the sample sheet to enable two ends of the fabric sample sheet to be positioned in the middle of the reinforcing sheet and to be in a clamped state, and ensuring that the effective sample sheet length in the middle of the reinforcing sheet is not less than 200mm after bonding and curing;
6) And (3) testing: and clamping the hardened fabric glued with the reinforcing sheet to the middle of a test chuck of a universal testing machine, locking, stretching the test sample at a constant speed until the test sample is broken, recording the maximum force of the test sample when the test sample is broken, wherein each group of tests has at least 5 effective data, and calculating the average value as the tensile breaking strength of the fabric.
Examples
A method for testing tensile breaking strength of carbon fiber fabric,
1) Sampling: naturally unreeling a carbon fiber fabric for a certain length from a reel on a flat table top, keeping the original state of the fabric as far as possible without the action of external force during unreeling, sticking a transparent adhesive tape of 5-30 mm to form a fabric area of 400-400mm, pressing the adhesive tape to the fabric fully by force, and then cutting the fabric along the central line of the adhesive tape by using scissors;
2) Gum dipping: preparing a flat plate, wherein the size of the flat plate is 450 x 450mm in length and width, the natural warping degree is smaller than 1mm, demolding cloth is pasted on one side of the flat plate, the taken single-layer carbon fiber fabric is flatly paved on one side, provided with the demolding cloth, of the flat plate, and then liquid epoxy resin glue is uniformly coated on the fabric once;
3) And (3) curing: putting the dipped fabric and the flat plate into an oven together, curing for 30-90 min at 40-120 ℃, cooling to room temperature, and taking out the hardened fabric;
4) Cutting: cutting sample pieces with the length and width of 300mm x 50mm from the hardened fabric, wherein the length direction is the fiber direction;
5) Gluing the reinforcing sheet: respectively sticking 2 reinforcing sheets with the length and the width of 50 and 50mm to the two ends of the sample sheet to enable the fabric sample sheet to be in a clamped state in the middle of the reinforcing sheet, and ensuring that the effective sample sheet length in the middle of the reinforcing sheet is 200 +/-1 mm after bonding and curing;
6) And (3) testing: and clamping the hardened fabric glued with the reinforcing sheet to the middle of a test chuck of a universal testing machine, locking, stretching the test sample at a constant speed until the test sample is broken, recording the maximum force when the test sample is broken, wherein each group of tests needs 5 effective data, and calculating the average value as the tensile breaking strength of the fabric.
The liquid epoxy resin adhesive in the step 2) is a composition of E51 and triethylene tetramine, and the proportion of the liquid epoxy resin adhesive is E51: triethylene tetramine =10g, and is prepared in situ before use.
The reinforcing sheet in the step 5) is made of aluminum alloy or glass fiber reinforced plastic, and the thickness of the reinforcing sheet is 1-3 mm.
The fracture state of the carbon fiber fabric after the test is as follows:
tensile breaking strength data are shown in the table
Claims (3)
1. A test method for tensile breaking strength of carbon fiber fabric is characterized by comprising the following steps:
1) Sampling: naturally unreeling a carbon fiber fabric for a certain length from a reel on a flat table top, keeping the fabric in an original state as far as possible without the action of external force during unreeling, sticking a frame of the fabric to be tested by using a transparent adhesive tape, fully sticking the adhesive tape to the fabric by using strong pressing, and then cutting the fabric to be tested along the central line of the adhesive tape by using scissors;
2) Gum dipping: preparing a flat plate, wherein the size of the flat plate is larger than that of the fabric to be tested, the natural warping degree is smaller than 1mm, demolding cloth is pasted on one side of the flat plate, the taken-off fabric to be tested is flatly paved on one side, to which the demolding cloth is pasted, and then liquid epoxy resin glue is uniformly brushed on the fabric to be tested once;
3) And (3) curing: putting the dipped fabric to be tested and the flat plate into an oven together for curing for 30-90 min at 40-120 ℃, and taking out the hardened fabric after cooling to room temperature;
4) Cutting: cutting a rectangular sample piece on the hardened fabric to be tested, wherein the length direction is the fiber direction;
5) Gluing the reinforcing sheet: respectively sticking reinforcing sheets to two ends of the sample sheet to enable two ends of the fabric sample sheet to be positioned in the middle of the reinforcing sheet and to be in a clamped state, and ensuring that the effective sample sheet length in the middle of the reinforcing sheet is not less than 200mm after bonding and curing; the reinforcing sheet is made of aluminum alloy or glass fiber reinforced plastic,
6) And (3) testing: and clamping the hardened fabric glued with the reinforcing sheet in the middle of a testing chuck of a universal testing machine, locking, stretching the sample at a constant speed until the sample is broken, recording the maximum force of the sample when the sample is broken, wherein each group of tests at least has 5 effective data, and calculating the average value as the tensile breaking strength of the fabric.
2. The method for testing tensile breaking strength of a carbon fiber fabric according to claim 1, characterized in that: the liquid epoxy resin adhesive in the step 2) is a composition of E51 and triethylene tetramine, and the proportion of the liquid epoxy resin adhesive is E51: triethylene tetramine =10g, and is prepared in situ before use.
3. The method for testing tensile breaking strength of a carbon fiber fabric according to claim 1, characterized in that: the thickness of the reinforcing sheet in the step 5) is 1-3 mm.
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CN113176128B (en) * | 2021-05-19 | 2022-08-30 | 中国建筑科学研究院有限公司 | Sample preparation method for testing tensile property of unidirectional carbon fiber cloth |
CN116519476B (en) * | 2023-06-30 | 2023-10-20 | 太仓群特电工材料有限公司 | Research and development is with data detection device of high-strength fiber adhesive tape |
CN117309525B (en) * | 2023-09-28 | 2024-02-20 | 浦江县丰源家纺有限公司 | Fabric tear resistance detection equipment |
CN117110060B (en) * | 2023-10-23 | 2023-12-26 | 南通市法博纤维织造有限公司 | Method for testing tensile strength of alkali-resistant glass fiber mesh cloth |
CN117139175B (en) * | 2023-11-01 | 2023-12-29 | 江苏启宸新材料有限公司 | Quality control method for screening short fibers special for environment-friendly spunlaced non-woven fabric |
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JP2011247794A (en) * | 2010-05-28 | 2011-12-08 | Toyota Boshoku Corp | Tensile test method of fabric |
CN102809499B (en) * | 2012-08-15 | 2015-01-14 | 中国科学院宁波材料技术与工程研究所 | Sample preparation method for carbon fiber tensile property test |
CN104833573A (en) * | 2015-05-12 | 2015-08-12 | 陕西法士特齿轮有限责任公司 | Method for detecting tensile breaking force of polyacrylonitrile-based carbon fiber cloth |
CN105352773B (en) * | 2015-11-23 | 2018-05-08 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of method for testing fiberglass products ultimate strength |
CN107367428A (en) * | 2017-07-17 | 2017-11-21 | 威海拓展纤维有限公司 | The method of testing of high modulus carbon fiber woven fabric tension failure strength |
CN108303296B (en) * | 2018-01-18 | 2020-11-20 | 航天材料及工艺研究所 | Sample preparation method for tensile property test of high-model carbon fiber multifilament |
CN108318302B (en) * | 2018-01-18 | 2020-11-20 | 航天材料及工艺研究所 | Sample preparation method for tensile property test of asphalt-based carbon fiber multifilament |
CN108469366B (en) * | 2018-03-13 | 2021-07-13 | 航天材料及工艺研究所 | Large-tow carbon fiber multifilament tensile property test sample and sample preparation method thereof |
CN108426760A (en) * | 2018-04-03 | 2018-08-21 | 威海拓展纤维有限公司 | The method for preparing carbon fibre composite interlaminar shear strength batten |
CN109580308B (en) * | 2018-12-26 | 2021-06-01 | 四川航天拓鑫玄武岩实业有限公司 | Preparation method of basalt fiber reinforced resin matrix composite rod tensile test piece |
CN111735679A (en) * | 2020-08-04 | 2020-10-02 | 卡本科技集团股份有限公司 | Sample preparation method for testing tensile strength of carbon fiber plate |
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