CN101819109B - Method for measuring nano monofilament tensile strength - Google Patents
Method for measuring nano monofilament tensile strength Download PDFInfo
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- CN101819109B CN101819109B CN2010101898589A CN201010189858A CN101819109B CN 101819109 B CN101819109 B CN 101819109B CN 2010101898589 A CN2010101898589 A CN 2010101898589A CN 201010189858 A CN201010189858 A CN 201010189858A CN 101819109 B CN101819109 B CN 101819109B
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- nanofiber
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- pulling strengrth
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Abstract
The invention discloses a method for measuring nano monofilament tensile strength, relates to a method for measuring fiber tensile strength, and solves the problems of complex operation and inconvenient operation in the conventional method for measuring nano-fibers. The method for measuring the nano monofilament tensile strength comprises the following steps of: 1, fixing the nano-fibers on a concave template, dropping super glue in the middles of the nano-fibers, and curing to obtain a small ball; 2, clamping the small ball by using a clamp, connecting the clamp with a mechanical sensor, and connecting the mechanical sensor with a computer; 3, slowly pulling the concave template along the nano-fiber direction, recording the tensile load borne by the clamp in real time by the computer until the nano-fibers are in tensile failure, substituting the maximum tensile load Fm into a formula that sigma t=Fm/s to calculate the intensity sigma t of the nano-fibers and finishing the measurement of the nano monofilament tensile strength. The method for measuring the nano fiber tensile strength has the advantages of simpleness, easy operation and high accuracy, can be operated in open environment, has convenient operation, and has the accuracy rate of over 95 percent.
Description
Technical field
The present invention relates to a kind of measuring method of fibre single thread pulling strengrth.
Background technology
1991, synthesizing of Japanese scholar Lijima reported first CNT started the research boom of nanofiber.Nanofiber, promptly monodimension nanometer material can be divided into nanotube, nano wire, nano belt, nano-cable etc. according to pattern.Because nanometer size effect, nanofiber can show the performance that much is different from block materials, like character such as the optics of novelty, electricity, catalysis, in fields such as microelectronics, photoelectron and nano-catalytics great application prospect is arranged; Simultaneously; Nanofiber also has excellent mechanical property; Elastic modulus and pulling strengrth can all have extremely important using value in enhancing Metal Substrate, ceramic base, resin-based field of compound material near theoretical value (like CNT and SiC nano fiber).In order to realize above-mentioned potential application, at first tackle the performance of nanofiber and further investigate.
The pulling strengrth of nanofiber is an important mechanical performance index, is used for weighing the maximum tension stress that nanofiber can bear.Usually, when fiber was used as composite material reinforcement body, enhancing and toughening effect depended primarily on the pulling strengrth of fiber.So the pulling strengrth of measuring fiber accurately seems particularly important and necessary.The measuring technology of traditional fibre (referring generally to the fiber of diameter more than micron dimension) pulling strengrth; Be mature on the whole; As long as the fiber two ends are fixed and under the traction of load, broken, the load when noting fibre breakage just can calculate the value of pulling strengrth according to the cross-sectional area of fiber.Though this method is equally applicable to nanofiber on principle, because the diameter very little (several nanometers to hundreds of nanometer) of nanofiber, the two ends that can't as the operation with traditional fiber, directly clamp or cling fiber often will be by micro-nano operative technique.
The existing method of measurement nanofiber seldom; All need nanofiber be fixed on the mechanics probe by atomic force microscope or the electron microscope that has an original position operating function; Then (for example at the loading stretched nano wire that continues to raise; List of references: W.Ding et al., Mechanics of crystalline boron nanowires, Composites Science and Technology 66 (2006) 1109-1121).In concrete operations; The most difficult step that realizes is exactly that two ends with nanofiber are fixed on the mechanics probe; Can ascribe the reason of two aspects to: the one, the size of nanofiber is too little and be not easy gripping, and the 2nd, minimum power can make nanofiber produce fracture or damage in the operation.Simultaneously,, be unfavorable for repetition and substantive test in atomic force microscope or electron microscope, lack practicality because existing method of testing need be operated.
Summary of the invention
The objective of the invention is in order to solve the existing problem that nanofiber process exists complicated operation and inconvenient operation of measuring.
The method of measuring the nanofiber pulling strengrth realizes through following step: one, the two ends with nanofiber are fixed on the concave template; Then seccotine is dropped in behind the nanofiber centre and at room temperature solidify, promptly on nanofiber, obtain diameter and be 1～100 micron bead; Two, the dop of regulating jig is then clamped the bead on the nanofiber, and dop is connected with mechanics sensor, and mechanics sensor is connected with computing machine; Three, dop is fixed, slowly spurs concave template along the nanofiber axial direction with the speed of 1～100 μ m/min, by the computer real-time record drag load that dop bore, is broken up to nanofiber, obtains maximum pull load F
m, with F
mBring formula σ into
t=F
m/ s calculates the intensity σ of nanofiber
tPromptly accomplished the nanofiber stretching strength measurement; Wherein, σ in the above-mentioned formula
tThe intensity of expression nanofiber, σ
tUnit: Gpa, F
mExpression maximum pull load, F
mUnit: mN, S represent the cross-sectional area of nanofiber section, the unit of S: μ m
2
Simple, the easy operation of the inventive method, accuracy rate height can be operated in open environment, and be easy to operate, but repeated test and substantive test are practical; Rate of accuracy reached is more than 95%.
Compare with the said method of Fig. 1, easier, the easy operating of the present invention, testing cost can reduce greatly, and is beneficial to the test of a large amount of samples, has higher using value.Nanofiber is fixed on the concave template and can in open space, carries out, avoided in the existing method of testing in atomic force microscope or electron microscope nanofiber is fixed to complicated easy on the mechanics probe; The inventive method can be avoided the nanofiber damage, has higher precision.Be applicable to the fiber of measuring diameter 5～2000nm.If the length of fiber less than 2mm, can be fixed on nanofiber to be measured two ends on the nanometer rods through linking two nanometer rods in advance at the concave template two ends earlier then.
Description of drawings
Fig. 1 is the existing synoptic diagram of measuring the nanofiber method; Fig. 2 is the synoptic diagram that jig blocks the bead on the nanofiber, and Fig. 3 is the synoptic diagram that nanofiber is broken; 1 expression traction end among the figure, 2 expression nanofibers, 3 expression stiff ends, 4 expression jigs, 5 expression beads, 6 expression concave template, 7 expression mechanics sensors, ← expression pulling direction.
Embodiment
Embodiment one: the method for measuring the nanofiber pulling strengrth in this embodiment realizes through following step: one, the two ends with nanofiber are fixed on the concave template; Then seccotine is dropped in behind the nanofiber centre and at room temperature solidify, promptly on nanofiber, obtain diameter and be 1～100 micron bead; Two, the dop of regulating jig is then clamped the bead on the nanofiber, and dop is connected with mechanics sensor, and mechanics sensor is connected with computing machine; Three, dop is fixed, slowly spurs concave template along the nanofiber axial direction with the speed of 1～100 μ m/min, by the computer real-time record drag load that dop bore, is broken up to nanofiber, obtains maximum pull load F
m, with F
mBring formula σ into
t=F
m/ s calculates the intensity σ of nanofiber
tPromptly accomplished the nanofiber stretching strength measurement; Wherein, σ in the above-mentioned formula
tThe intensity of expression nanofiber, σ
tUnit: Gpa, F
mExpression maximum pull load, F
mUnit: mN, S represent the cross-sectional area of nanofiber section, the unit of S: μ m
2
Deformation does not take place in bead in the step 3 process.
Embodiment two: what this embodiment and embodiment one were different is: the seccotine described in the step 1 is 502 seccotines or 101 seccotines.Other step is identical with embodiment one with parameter.
Embodiment three: what this embodiment was different with embodiment one or two is: it is paper, metal, monocrystalline silicon piece or plastics that step 1 is stated the concave template material.Other step is identical with embodiment one or two with parameter.
Embodiment four: what this embodiment was different with one of embodiment one to three is: the width of the said concave template groove of step 1 is not less than 2mm.Other step is identical with one of embodiment one to three with parameter.
Embodiment five: what this embodiment was different with one of embodiment one to four is: the diameter that on nanofiber, obtains bead in the step 1 is 5～80 microns.Other step is identical with one of embodiment one to four with parameter.
Embodiment six: what this embodiment was different with one of embodiment one to four is: the diameter that on nanofiber, obtains bead in the step 1 is 10～50 microns.Other step is identical with one of embodiment one to four with parameter.
Embodiment seven: what this embodiment was different with one of embodiment one to four is: the diameter that on nanofiber, obtains bead in the step 1 is 20 microns.Other step is identical with one of embodiment one to four with parameter.
Embodiment eight: the method for measuring the nanofiber pulling strengrth in this embodiment realizes through following step: be that the two ends of the SiC nano fiber of 400nm are fixed on the papery concave template with diameter one; Then 101 seccotines are dropped in behind the nanofiber centre and at room temperature solidify, promptly on nanofiber, obtain diameter and be 15 microns bead; Two, with on the composite material interface device for evaluating performance, to regulate the dop of jig then the bead on the nanofiber is clamped, and dop is connected with mechanics sensor, mechanics sensor is connected with computing machine; Three, dop is fixed, slowly spurs concave template along the nanofiber axial direction with the speed of 50 μ m/min, and (see figure 2) by the computer real-time record drag load that dop bore, is broken (see figure 3) up to nanofiber, obtains maximum pull load F
m=2.46mN, nanofiber cross-sectional area S=0.1256 μ m
2, with F
mBring formula σ into
t=F
m/ s calculates the intensity σ of nanofiber
t=19.59GPa; Promptly accomplished the nanofiber stretching strength measurement.
This embodiment composite material interface device for evaluating performance is that the eastern flourish Industry Co., Ltd of Japan produces product type: HM410 type.
Adopt metal, monocrystalline silicon piece or plastic material concave template replacement papery concave template; Variable 502 glue that are changed to of seccotine; The conversion concave template all can not impact measurement result with the type that substitutes glue, change template or glue and the error rate that causes less than 2%.
Claims (7)
1. method of measuring the nanofiber pulling strengrth; It is characterized in that performing step is following: one, the two ends with nanofiber are fixed on the concave template; Then seccotine is dropped in behind the nanofiber centre and at room temperature solidify, promptly on nanofiber, obtain diameter and be 1～100 micron bead; Two, the dop of regulating jig is then clamped the bead on the nanofiber, and dop is connected with mechanics sensor, and mechanics sensor is connected with computing machine; Three, dop is fixed, slowly spurs concave template along the nanofiber axial direction with the speed of 1～100 μ m/min, by the computer real-time record drag load that dop bore, is broken up to nanofiber, obtains maximum pull load F
m, with F
mBring formula σ into
t=F
m/ s calculates the intensity σ of nanofiber
tPromptly accomplished the nanofiber stretching strength measurement; Wherein, σ in the above-mentioned formula
tThe intensity of expression nanofiber, σ
tUnit: Gpa, F
mExpression maximum pull load, F
mUnit: mN, S represent the cross-sectional area of nanofiber section, the unit of S: μ m
2
2. a kind of method of measuring the nanofiber pulling strengrth according to claim 1 is characterized in that the seccotine described in the step 1 is 502 seccotines or 101 seccotines.
3. a kind of method of measuring the nanofiber pulling strengrth according to claim 1 and 2 is characterized in that it is paper, metal, monocrystalline silicon piece or plastics that step 1 is stated the concave template material.
4. a kind of method of measuring the nanofiber pulling strengrth according to claim 3 is characterized in that the width of the said concave template groove of step 1 is not less than 2mm.
5. according to claim 1,2 or 4 described a kind of methods of measuring the nanofiber pulling strengrth, the diameter that it is characterized in that on nanofiber, obtaining in the step 1 bead is 5～80 microns.
6. according to claim 1,2 or 4 described a kind of methods of measuring the nanofiber pulling strengrth, the diameter that it is characterized in that on nanofiber, obtaining in the step 1 bead is 10～50 microns.
7. according to claim 1,2 or 4 described a kind of methods of measuring the nanofiber pulling strengrth, the diameter that it is characterized in that on nanofiber, obtaining in the step 1 bead is 20 microns.
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| CN2010101898589A CN101819109B (en) | 2010-06-02 | 2010-06-02 | Method for measuring nano monofilament tensile strength |
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| CN103048195A (en) * | 2012-12-25 | 2013-04-17 | 山东胜通钢帘线有限公司 | Detecting instrument for elongation amount of steel cord at specific load |
| CN103837408B (en) * | 2014-03-11 | 2016-04-13 | 南京航空航天大学 | A kind of carbon mono-filaments pulling strengrth proving installation and method of testing thereof |
| CN105004612A (en) * | 2015-06-05 | 2015-10-28 | 中国科学院山西煤炭化学研究所 | Detection method for mechanical property of carbon fiber multi-scale reinforcement body |
| CN104990813A (en) * | 2015-08-14 | 2015-10-21 | 核工业理化工程研究院 | Gum dipping fiber mechanical property testing method |
| CN106959245B (en) * | 2017-03-05 | 2019-10-18 | 北京工业大学 | A kind of fixture and experimental method for testing conductive fiber mechanical property under piezoelectric media effect |
| CN112540007B (en) * | 2020-12-07 | 2023-01-24 | 航天特种材料及工艺技术研究所 | Method and device for testing high-temperature tensile property of fiber monofilament |
| CN114544326B (en) * | 2022-02-25 | 2023-09-22 | 河南省计量测试科学研究院 | Fiber strength measuring method |
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| JP4448932B2 (en) * | 2004-10-04 | 2010-04-14 | 学校法人立命館 | Nanowire tensile test device and test method using the same |
| CN1995962A (en) * | 2006-12-29 | 2007-07-11 | 北京工业大学 | Device and method for testing in-situ mechanical property of single nano-wire in scanning electron microscope |
| CN100590412C (en) * | 2006-12-29 | 2010-02-17 | 北京工业大学 | Nano-wire in-situ stretching device in scanning electron microscope and method therefor |
| CN101285747B (en) * | 2008-04-25 | 2010-09-08 | 哈尔滨工业大学 | In situ nanometer stretching experiment measuring detection device |
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