CN114280280A - Method for testing number of carbon fiber multifilament - Google Patents
Method for testing number of carbon fiber multifilament Download PDFInfo
- Publication number
- CN114280280A CN114280280A CN202111603211.0A CN202111603211A CN114280280A CN 114280280 A CN114280280 A CN 114280280A CN 202111603211 A CN202111603211 A CN 202111603211A CN 114280280 A CN114280280 A CN 114280280A
- Authority
- CN
- China
- Prior art keywords
- fiber
- multifilament
- testing
- sample
- multifilaments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method for testing the number of carbon fiber multifilaments. According to the method, carbon fiber is subjected to gum dipping and curing or a sample strip with multifilament tensile strength is taken as a sample, and the fiber volume content is calculated by testing the true density, the single fiber sectional area and the multifilament sectional area of the sample, so that the number of multifilament fibers is obtained. The method of the invention does not need to count the fiber number, avoids the influence of the counting deviation on the result, can quickly detect the fiber number, and meets the requirements of scientific research and production and failure analysis.
Description
Technical Field
The invention belongs to the technical field of physicochemical tests, and relates to a method for testing the number of carbon fiber multifilaments.
Background
At present, the number of carbon fiber multifilaments is mainly tested according to GB/T3364-. However, in the actual testing process, the number of the multifilament fibers in the photo needs to be counted, and the counting is more, dense and larger, so that errors are easy to occur during counting, the operability is poor, and the testing is easy to occur.
The Chinese patent application CN103822933A discloses a method for measuring the number of carbon fiber multifilament fibers, which adopts a scanning electron microscope to analyze and comprises the steps of sampling, sample preparation, cold inlaying of a sample, grinding and flattening of the sample, placing the sample, vacuumizing of the scanning electron microscope, adjusting parameters of the scanning electron microscope, low-vacuum shooting of the scanning electron microscope, measuring the number of the fibers and calculating test results. However, the method still performs point counting on the number of the monofilaments of the fibers in the observation area in the shot picture, is suitable for measuring the number of the multifilaments of the small tows, and is easy to make mistakes due to more point numbers when the method is used for the multifilaments of the tows of more than or equal to 3K.
Disclosure of Invention
Aiming at the problems of poor operability and easy error in testing of the existing testing method, the invention provides a method for testing the number of carbon fiber multifilaments.
The technical scheme of the invention is as follows:
a method for testing the number of carbon fiber multifilaments comprises the following specific steps:
(1) preparing a sample: curing the carbon fiber multifilament after gum dipping or directly taking a sample strip for testing the tensile strength of the multifilament as a sample;
(2) true density of test specimens: testing the true density rho of the sample by using a true density instrument;
(3) testing the sectional area of a single fiber: adopting a metallographic microscope or a scanning electron microscope to test the sectional area of the single fiber, wherein the sectional area of the single fiber is the average value A of the measured sectional areas of the single fibersSingle root of single root；
(4) Multifilament cross-sectional area test: testing the sectional area of the multifilament by adopting a metallographic microscope or a scanning electron microscope, and repeatedly testing for more than 3 times, wherein the sectional area of the multifilament is the average value A of the sectional areas of the multifilament measured each time;
(5) calculation testFiber volume content v of the sampleFiber: the calculation formula is vFiber＝(ρ-ρResin composition)/(ρFiber-ρResin composition) Where ρ isResin compositionIs the resin density, ρFiberIs the density of the carbon fiber multifilament;
(6) calculating the number of the multifilaments: from the formula v for the fiber volume contentFiber＝N*ASingle root of single rootA, available fiber number calculation formula N ═ vFiber*A/ASingle root of single rootAnd calculating the number of the monofilaments in the multifilament.
Preferably, in the step (3), the tested number of the single fiber is more than or equal to 5.
In step (5) of the present invention,. rho.Resin compositionThe pure resin density of the gum dipping resin after curing according to the same curing system can be obtained by adopting a conventional testing method.
In step (5) of the present invention,. rho.FiberThe bulk density of the carbon fiber multifilament yarn can be obtained by a conventional test method.
Preferably, the method also comprises a step (7), the multifilaments in the same batch are tested according to the steps (1) to (6), the number of samples is more than or equal to 3, and the number N of the multifilaments in the test batch is testedAverageThe average value of the number of the monofilaments in the multifilaments of each sample is obtained, and the difference of the number of the multifilaments calculated by continuously testing each sample for more than 3 times is less than 0.5 percent.
According to the invention, the carbon fiber gum dipping cured sample or the sample strip of the multifilament tensile strength is directly used as the sample, and the multifilament fiber number is calculated by testing the true density, the single fiber cross-sectional area and the multifilament cross-sectional area of the sample, so that the fiber number does not need to be counted, the influence of counting on the result is avoided, and the accuracy and the repeatability of the test result are improved.
Detailed Description
The invention is further explained below with reference to specific examples.
Example 1
In this embodiment, taking SYT49-3K as an example, the detailed steps are as follows:
firstly, preparing a sample, and directly taking a sample strip for a SYT49S-3K multifilament tensile strength test as the sample;
second, testingWeighing 18.9361g of sample, and testing the true density rho of the sample by using a true density instrument to obtain the rho of 1.49g/cm3；
Thirdly, testing the sectional area of the single fiber, and respectively testing the diameters of 10 single fibers by adopting a metallographic microscope or a scanning electron microscope, wherein the average value of the diameters of the single fibers is 7.0 mu m, and the average value A of the sectional areas of the single fibers isSingle root of single root＝153.86μm2；
Fourthly, testing the sectional area of the multifilament by using a metallographic microscope or a scanning electron microscope, and testing the sectional area of the multifilament for 3 times, wherein the average value A of the sectional areas of the multifilament is 772490 mu m2；
A fifth step of calculating the fiber volume content v of the sampleFiberThe calculation formula is vFiber＝(ρ-ρResin composition)/(ρFiber-ρResin composition) Where ρ isResin compositionIs 1.1g/cm3，ρFiberIs 1.79g/cm3Substituting into formula vFiber＝(ρ-ρResin composition)/(ρFiber-ρResin composition) V. availableFiber＝56.5％；
Sixthly, calculating the number of the multifilaments according to the fiber volume content formula vFiber＝N*ASingle root of single rootA, the number of available fibers N ═ vFiber*A/ASingle root of single rootAnd N is 2838.
The effective data of the number of the 3 multifilaments tested in the same batch are 2838, 2880 and 2836 respectively, and the number of the SYT49S-12K multifilaments is 2851.
Example 2
In this embodiment, taking SYT55-12K as an example, the detailed steps are as follows:
firstly, preparing a sample, and directly taking a sample strip for a SYT55-12K multifilament tensile strength test as the sample;
secondly, testing the true density of the sample, weighing 17.6314g of the sample, and testing the true density rho of the sample by using a true density instrument, wherein the rho is 1.47g/cm3；
Thirdly, testing the sectional area of the single fiber, and respectively testing the diameters of 10 single fibers and the average diameter of the single fibers by adopting a metallographic microscope or a scanning electron microscopeThe value is 5.5 μm, the average value A of the cross-sectional areas of the individual fibersSingle root of single root，ASingle root of single rootIs 94.99 mu m2；
Fourthly, testing the sectional area of the multifilament by using a metallographic microscope or a scanning electron microscope, and testing the sectional area of the multifilament for 3 times, wherein the average value A of the sectional areas of the multifilament is 2075443 mu m2；
A fifth step of calculating the fiber volume content v of the sampleFiberThe test calculation formula is vFiber＝(ρ-ρResin composition)/(ρFiber-ρResin composition) Where ρ isResin compositionIs 1.1g/cm3，ρFiberIs 1.79g/cm3Substituting into formula vFiber＝(ρ-ρResin composition)/(ρFiber-ρResin composition) V. availableFiber＝53.6％；
Sixthly, calculating the number of the multifilaments according to the fiber volume content formula vFiber＝N*ASingle root of single rootA, the number of available fibers N ═ vFiber*A/ASingle root of single rootAnd N is 11717.
As described above, the effective data for testing the number of the 3 multifilaments of the same batch are 11717, 11928 and 11626 respectively, and the number of the SYT49S-12K multifilaments is 11757.
Example 3
In this embodiment, taking SYT49-12K as an example, the detailed steps are as follows:
firstly, preparing a sample, and directly taking a sample strip for a SYT49-12K multifilament tensile strength test as the sample;
secondly, testing the true density of the sample, weighing 18.7654g of the sample, and testing the true density rho of the sample by using a true density instrument, wherein the rho is 1.45g/cm3；
Thirdly, testing the sectional area of the single fiber, and respectively testing the diameters of 10 single fibers by adopting a metallographic microscope or a scanning electron microscope, wherein the average value of the diameters of the single fibers is 6.8 mu m, and the average value A of the sectional areas of the single fibers isSingle root of single root，ASingle root of single root145.19 μm2；
Fourthly, testing the sectional area of the multifilament, and testing the sectional area of the multifilament for 3 times by adopting a metallographic microscope or a scanning electron microscopeHas an average value A of 3363647 μm2；
A fifth step of calculating the fiber volume content v of the sampleFiberThe test calculation formula is vFiber＝(ρ-ρResin composition)/(ρFiber-ρResin composition) Where ρ isResin compositionIs 1.1g/cm3，ρFiberIs 1.79g/cm3Substituting into formula vFiber＝(ρ-ρResin composition)/(ρFiber-ρResin composition) V. availableFiber＝50.7％；
Sixthly, calculating the number of the multifilaments according to the fiber volume content formula vFiber＝N*ASingle root of single rootA, the number of available fibers N ═ vFiber*A/ASingle root of single rootAnd N is 11751.
According to the method, the effective data of the number of the 3 multifilaments in the same batch are 11751, 11970 and 11739 respectively, and the number of the SYT49S-12K multifilaments is 11820.
Claims (5)
1. A method for testing the number of carbon fiber multifilaments is characterized by comprising the following steps:
(1) preparing a sample: curing the carbon fiber multifilament after gum dipping or directly taking a sample strip for testing the tensile strength of the multifilament as a sample;
(2) true density of test specimens: testing the true density rho of the sample by using a true density instrument;
(3) testing the sectional area of a single fiber: adopting a metallographic microscope or a scanning electron microscope to test the sectional area of the single fiber, wherein the sectional area of the single fiber is the average value A of the measured sectional areas of the single fibersSingle root of single root；
(4) Multifilament cross-sectional area test: testing the sectional area of the multifilament by adopting a metallographic microscope or a scanning electron microscope, and repeatedly testing for more than 3 times, wherein the sectional area of the multifilament is the average value A of the sectional areas of the multifilament measured each time;
(5) calculating the fiber volume content v of the sampleFiber: the calculation formula is vFiber＝(ρ-ρResin composition)/(ρFiber-ρResin composition) Where ρ isResin compositionIs the resin density, ρFiberIs the density of the carbon fiber multifilament;
(6) calculating the number of the multifilaments: from the formula v for the fiber volume contentFiber＝N*ASingle root of single rootA, available fiber number calculation formula N ═ vFiber*A/ASingle root of single rootAnd calculating the number of the monofilaments in the multifilament.
2. The test method according to claim 1, wherein in the step (3), the number of the individual fibers tested is not less than 5.
3. The test method of claim 1, wherein pResin compositionThe pure resin density of the gum dipping resin after curing according to the same curing system.
4. The test method according to claim 1, wherein in the step (5), pFiberIs the bulk density of the carbon fiber multifilament.
5. The method according to claim 1, comprising a step (7) of testing the same lot of the multifilaments in the steps (1) to (6) with a number of samples of 3 or more and a number of multifilaments N of the test lotAverageThe average value of the number of the monofilaments in the multifilaments of each sample is obtained, and the difference of the number of the multifilaments calculated by continuously testing each sample for more than 3 times is less than 0.5 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111603211.0A CN114280280A (en) | 2021-12-24 | 2021-12-24 | Method for testing number of carbon fiber multifilament |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111603211.0A CN114280280A (en) | 2021-12-24 | 2021-12-24 | Method for testing number of carbon fiber multifilament |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114280280A true CN114280280A (en) | 2022-04-05 |
Family
ID=80875349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111603211.0A Pending CN114280280A (en) | 2021-12-24 | 2021-12-24 | Method for testing number of carbon fiber multifilament |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114280280A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115165553A (en) * | 2022-06-10 | 2022-10-11 | 中复神鹰碳纤维股份有限公司 | Method for accepting or rejecting tensile strength test value of carbon fiber multifilament |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825587A (en) * | 2010-04-15 | 2010-09-08 | 哈尔滨飞机工业集团有限责任公司 | Fiber volume content test method of glass fiber laminated board |
| CN106342215B (en) * | 2010-04-23 | 2012-10-03 | 哈尔滨飞机工业集团有限责任公司 | Carbon fibre reinforced plastic fiber volume fraction method of testing |
| CN103822933A (en) * | 2012-11-16 | 2014-05-28 | 哈尔滨飞机工业集团有限责任公司 | Fiber number measurement method for carbon fiber multifilament |
| CN105603597A (en) * | 2014-11-24 | 2016-05-25 | 东丽纤维研究所（中国）有限公司 | Two-component multifilament |
| CN109633133A (en) * | 2018-11-16 | 2019-04-16 | 绍兴文理学院元培学院 | The test method of number of fiber in a kind of yarn |
-
2021
- 2021-12-24 CN CN202111603211.0A patent/CN114280280A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825587A (en) * | 2010-04-15 | 2010-09-08 | 哈尔滨飞机工业集团有限责任公司 | Fiber volume content test method of glass fiber laminated board |
| CN106342215B (en) * | 2010-04-23 | 2012-10-03 | 哈尔滨飞机工业集团有限责任公司 | Carbon fibre reinforced plastic fiber volume fraction method of testing |
| CN103822933A (en) * | 2012-11-16 | 2014-05-28 | 哈尔滨飞机工业集团有限责任公司 | Fiber number measurement method for carbon fiber multifilament |
| CN105603597A (en) * | 2014-11-24 | 2016-05-25 | 东丽纤维研究所（中国）有限公司 | Two-component multifilament |
| CN109633133A (en) * | 2018-11-16 | 2019-04-16 | 绍兴文理学院元培学院 | The test method of number of fiber in a kind of yarn |
Non-Patent Citations (3)
| Title |
|---|
| 吴世清;: "碳纤维系列标准", 化工生产与技术, no. 06, pages 1 - 4 * |
| 杨延风;张学军;田艳红;: "碳纤维复丝和单丝拉伸性能测试方法", 理化检验(物理分册), no. 07 * |
| 石宝 等: "玻璃纤维复合材料纤维体积含量的测定方法", 上海纺织科技, vol. 40, no. 9, pages 61 - 62 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115165553A (en) * | 2022-06-10 | 2022-10-11 | 中复神鹰碳纤维股份有限公司 | Method for accepting or rejecting tensile strength test value of carbon fiber multifilament |
| CN115165553B (en) * | 2022-06-10 | 2023-05-30 | 中复神鹰碳纤维股份有限公司 | Method for choosing and rejecting tensile strength test values of carbon fiber multifilaments |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114280280A (en) | Method for testing number of carbon fiber multifilament | |
| CN1959571A (en) | Method for detecting quality stability of rolled cigarette | |
| CN112229757B (en) | Method for evaluating quick conformity of pressure drop of cigarette and filter stick | |
| CN105651854A (en) | System and method for quantitatively determining trace <3>He in tritium-containing aging sample | |
| US5596901A (en) | Method for the absolute measurement of the tearing strength of fibres | |
| CN114152640A (en) | Method for determining content of adsorbed water in soil based on nuclear magnetic resonance | |
| CN111797695B (en) | Automatic identification method and system for twist of folded yarn | |
| CN113984693A (en) | Method for measuring residual quantity of harmful heavy metals in printing ink | |
| CN108548862A (en) | The measurement method of cadmium isotope in a kind of sample containing cadmium | |
| CN110823888A (en) | Method for measuring sorbitizing rate of medium-high carbon steel wire rod | |
| CN109030533A (en) | Method that is a kind of while measuring chemical fibre regain and oil content | |
| CN108823938B (en) | Yarn evenness tester | |
| CN111122317A (en) | Calibration method for r value test of metal material | |
| CN109596422B (en) | Transmission type measuring device and method for fiber bundle arrangement uniformity and fracture morphology | |
| CN109856088A (en) | A kind of on-line and non-contact inspection method of the attached husky density of insulator surface | |
| CN114563448A (en) | Blood quality detection device and method | |
| CN111579405A (en) | Multifunctional rock test system | |
| CN115468526B (en) | Method and system for identifying torsion angle of optical fiber image inverter | |
| CN112268905B (en) | Image detection method for short fiber content in textile fiber | |
| CN104390996A (en) | Test analysis method for elementary composition and structure on carbon fiber surface | |
| CN114878372B (en) | Method for determining parallel resistance value during PVDF current mode test explosion load | |
| CN116976077A (en) | Method and system for evaluating uncertainty of measurement result of metal tensile test | |
| CN102455342B (en) | Method for rapidly testing electroplated hydrogen embrittlement | |
| CN220418972U (en) | Soil PH value measuring equipment | |
| CN117724147A (en) | Rapid calibration method for large-batch gamma detectors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |