CN110487643A - A kind of micron order fiber cutting strength test method - Google Patents
A kind of micron order fiber cutting strength test method Download PDFInfo
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- CN110487643A CN110487643A CN201910679244.XA CN201910679244A CN110487643A CN 110487643 A CN110487643 A CN 110487643A CN 201910679244 A CN201910679244 A CN 201910679244A CN 110487643 A CN110487643 A CN 110487643A
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- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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Abstract
The invention discloses a kind of micron order fiber cutting strength test methods, it is characterised in that comprises the steps of: the pedestal spacing range that (1) finite element analysis determines that fiber is under shearing condition；(2) pedestal for fixing fiber to be measured is pre-processed；(3) size of pedestal intermediate space is measured；(4) fixed fiber to be measured；(5) probe loads the central compression of fiber to be measured, and measures the shearing force F needed for cutting fibers；(6) the shear strength T of fiber to be measured is calculated according to formula.The present invention can test the shear strength of accurate micron order fiber, and then can analyze the failure criteria of fiber under complex stress condition.
Description
Technical field
The present invention relates to fiber test method, specially a kind of micron order fiber cutting strength test method.
Background technique
Continuous fiber reinforced composite materials are possessing stronger mechanical property along fiber axial direction (longitudinal direction), and vertical
Poor in the intensity of machine direction (transverse direction), this becomes one of security risk when composite material uses in complex environment, therefore
The shear stress of measurement fiber is very important.The shear strength of different-diameter micron order fiber is conventionally also difficult to
Measurement.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, it is an object of the present invention to provide one kind can be to complexity
The failure criteria of fiber carries out analysis micron order fiber cutting strength test method under stress state.
A kind of technical solution: micron order fiber cutting strength test method of the present invention comprising the steps of:
(1) pedestal spacing size is altered in steps until the shear stress of fiber cross section to be measured becomes larger suddenly, at this time i.e. to
It surveys fiber and is in the pedestal spacing under shearing condition, finite element analysis fiber to be measured is in the pedestal spacing under shearing condition, bottom
Seat is made by high elastic modulus and with the sour material not reacted, preferably leaf；
(2) pedestal for fixing fiber to be measured is pre-processed, the plane that fiber to be measured is pasted on pedestal will guarantee
In parallel, two planes sheared are vertical, and the surface roughness of plane is less than the 10% of fiber radius to be measured, fiber to be measured
Diameter is 1~900 μm；
(3) size of pedestal intermediate space is measured, pedestal intermediate space is less than or equal to 5 times of fiber radius to be measured, uses up
The size for being measured microscopically gap is learned, judges whether the spacing in gap meets the requirements；
(4) fixed fiber to be measured, observes fiber to be measured using optical microscopy under 400 times or more amplification factors, determines
Whether fiber to be measured has been fixed；
(5) micron order fiber cutting test to be measured carries out in nanometer mechanics test macro, and nano-hardness tester probe is treated
The central compression for surveying fiber is loaded onto fiber to be measured and breaks, and compression distance is 5 × 10-4Mm, and measure and cut fiber to be measured
Required shearing force Fs, the size of probe is 0.9~0.95 times of pedestal intermediate space；
(6) calculation formula of the shear strength T of fiber to be measured are as follows:
Wherein, rfFor fiber radius to be measured, FsFor the shearing force needed for cutting fiber to be measured, measurement and fixation pass through light
Microscope is learned to observe under 400 times or more amplification factors；
(7) it repeats the above steps, repeatedly measurement is averaged.
Working principle: when carrying out compression-loaded to fiber to be measured with probe, the strain of the big generation of pedestal elasticity modulus can be with
It ignores, ensure that two faces of the pedestal in compression-loaded are vertical always, so that fiber to be measured be made to issue in shearing condition
Raw fracture.
The utility model has the advantages that compared to the prior art the present invention, has the characteristics that following conspicuousness: it is fine that accurate micron order can be tested
The shear strength of dimension, and then the fundamental mechanics performance of material can be provided to the failure criteria analysis of fiber under complex stress condition
Parameter.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the structural schematic diagram of present clip 4；
Fig. 3 is the structural schematic diagram of pedestal of the present invention；
Fig. 4 is finite element model figure of the invention.
Specific embodiment
In following embodiment, 1 radius r of fiber to be measuredfIt is taken as 3.5 μm.
1 finite element modelling of table obtains shear stress with gap width changing rule
| Gap/mm | Shearing stress/MPa |
| 0.04 | 608.92 |
| 0.02 | 606.99 |
| 0.018 | 675.68 |
| 0.01 | 710.45 |
(1) finite element analysis: first establishing fiber 1 to be measured with UG, and the model of pedestal 2 and probe 3 is as shown in figure 3, fibre to be measured
The tangential displacement for tieing up 1 shear fails is 5 × 10-4It is tangential along fiber to be measured 1 to apply a direction to probe 3 by mm, and size is 5 ×
10-4Then the displacement constraint of mm solves 1 shear stress of fiber to be measured, simulate pedestal 2 by changing the size of 2 spacing of pedestal
Influence of the gap to 1 shearing stress of fiber to be measured, the results are shown in Table 1, as it can be seen from table 1 the fiber to be measured 1 simulated is the bottom of at
The shearing stress of cross section increases suddenly when 2 gaps of seat are 0.018mm, can determine that this spacing is that fiber 1 to be measured is in shearing
The minimum spacing of state lower bottom base 2；
(2) processing of pedestal 2: the material of pedestal 2 must choose the big material of elasticity modulus, and fixture 4 must be chosen magnetic
Metal and easy processing, choosing 2 material of pedestal here is tungsten, and 4 material of fixture is steel, and tungsten elasticity modulus is big, and is not occurred with nitric acid
Reaction, tungsten is nonmagnetic to be fixed on grinding machine, and steel is magnetic, and leaf can be fixed on grinding machine and be processed, and first process one
Then leaf is clamped as shown in figures 2-3 with fixture 4, fixture 4 is fixed on grinding machine by fixture 4, A plane, which is carried out fine grinding, to be made
Its surface roughness is not more than 0.35 μm (the 10% of 1 radius of fiber to be measured), then the A planar registration strength by this to leaf
Glue sticks on fixture 4, and the B of leaf is then carried out fine grinding and guarantees the surface roughness of plane and the surface of flatness and feeler gauge
Roughness is consistent with flatness, and the ordinal characteristics handled in this way are to guarantee that the verticality of two planes of A, B makes fibre to be measured
Dimension 1 is in shearing condition when pushing, and is then fixed feeler gauge to the plane B leaf of leaf with this, and with clip by leaf
Clamp, the leaf B plane of clamping is contacted with embedding groove bottom and gently pushing leaf with guarantee this to the B plane of leaf with inlay
Leaf is embedded in slot by slot bottom seat 2 in the same plane and with agent is inlayed, and mosaic block is taken out simultaneously after inlaying agent solidification
Bubble makes the feeler gauge in gap melt away in molten nitric acid, obtains the pedestal 2 that spacing is 0.018mm, the characteristic of feeler gauge is can be with
Concentrated nitric acid reacts, and inlay agent and leaf not with nitric acid reaction；
The ordinal characteristics handled in this way are to guarantee that the verticality of two planes of A, B makes fiber 1 to be measured when pushing
In shearing condition, can be reacted with the main component α-cyanoacrylate of seccotine using acetone to make leaf from folder
Tool 4 on fall off, feeler gauge can react with nitric acid and leaf and inlay agent not with nitric acid reaction, guarantee gap in feeler gauge successfully
Dissolution, different gap can be controlled using the feeler gauge of different-thickness；
(3) actual range in gap is determined not less than spacing is observed under 400 multiples using optical microscopy, with
0.018mm is compared, and judges whether to be not much different；
(4) single fiber to be measured 1 is carefully clamped with tweezers passes through hot melt across on gap, and by 1 one end of fiber to be measured
Gluing is attached on pedestal 2, then fiber 1 to be measured is straightened, and fix the other end with hot melt adhesive, is spaced one in 2 transverse direction of pedestal
Set a distance uniformly fixes fiber 1 to be measured；Fiber 1 to be measured is observed in the case where being not less than 400 times of amplification factors using optical microscopy, really
Whether fixed fiber 1 to be measured has been fixed；
(5) fiber to be measured 1 prepared is sheared into sample on nano-hardness tester using the probe for being dimensioned slightly smaller than 180 μm
3 carry out compression-loaded, and fiber 1 to be measured is in shearing condition at this time, the fiber to be measured 1 that will be carried out by nanometer mechanics test macro
Shearing test is measured fiber 1 to be measured cutting required shearing force；
(6) according to formulaCalculate 1 shear strength of fiber to be measured, wherein rfFor fiber radius, FsFor by fiber
Shearing force needed for cutting.
Table 2 is to carry out the test data and fiber cutting intensity that fiber cutting is tested with the method for above-described embodiment,
Uniform anchoring fiber will be spaced upwardly of it by sequence number consecutively from left to right, respectively T300-S- leaf is horizontal
1, T300-S-2, T300-S-3, T300-S-4, T300-S-5, as can be seen from the table, the fiber cutting intensity of T300 fiber is
675.42MPa standard deviation 122.30MPa；The shear strength of T700 fiber is 942.94MPa, standard deviation 153.62MPa.
2 fiber cutting strength test data of table
| Number | Shearing force/N | Shear strength/MPa |
| T300-S-1 | 0.0642 | 834.52 |
| T300-S-2 | 0.0413 | 536.85 |
| T300-S-3 | 0.0485 | 630.44 |
| T300-S-4 | 0.0467 | 607.05 |
| T300-S-5 | 0.0591 | 768.23 |
| Average value | 0.0520 | 675.42 |
| Standard deviation | 0.0094 | 122.30 |
Claims (10)
1. a kind of micron order fiber cutting strength test method, it is characterised in that comprise the steps of:
(1) finite element analysis determines the proper range of pedestal (2) spacing that fiber is under shearing condition；
(2) pedestal (2) for fixing fiber to be measured (1) is pre-processed；
(3) size of pedestal (2) intermediate space is measured；
(4) fixed fiber (1) to be measured；
(5) probe (3) loads the central compression of fiber to be measured (1), and measures the shearing force F needed for cutting fibers；
(6) calculation formula of the shear strength T of fiber (1) to be measured are as follows:
Wherein, rfFor fiber to be measured (1) radius, FsFor the shearing force needed for cutting fiber to be measured (1).
2. a kind of micron order fiber cutting strength test method according to claim 1, it is characterised in that: the step
(1) when finite element analysis, pedestal (2) spacing size is altered in steps until the shear stress of fiber cross section becomes larger suddenly.
3. a kind of micron order fiber cutting strength test method according to claim 1, it is characterised in that: the step
(2) plane for pasting fiber on pedestal (2) will guarantee that two planes in parallel, sheared are vertical.
4. a kind of micron order fiber cutting strength test method according to claim 3, it is characterised in that: the plane
Surface roughness is less than the 10% of fiber radius.
5. a kind of micron order fiber cutting strength test method according to claim 3, it is characterised in that: the pedestal
(2) material not reacted with acid by high elastic modulus and is made.
6. a kind of micron order fiber cutting strength test method according to claim 1, it is characterised in that: the step
(2) diameter of fiber (1) to be measured is 1~900 μm in.
7. a kind of micron order fiber cutting strength test method according to claim 1, it is characterised in that: the step
(3) pedestal (2) intermediate space is less than or equal to 5 times of fiber to be measured (1) radius in.
8. a kind of micron order fiber cutting strength test method according to claim 1, it is characterised in that: the step
(5) middle probe (3) indentation is until fiber to be measured (1) is broken.
9. a kind of micron order fiber cutting strength test method according to claim 1, it is characterised in that: the step
(5) size of middle probe (3) is 0.9~0.95 times of pedestal (2) intermediate space.
10. a kind of micron order fiber cutting strength test method according to claim 1, it is characterised in that: the measurement
It is observed under 400 times or more amplification factors with fixed by optical microscopy.
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| CN201910679244.XA CN110487643B (en) | 2019-07-26 | 2019-07-26 | Method for testing shear strength of micron-sized fibers |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157362A (en) * | 2020-01-14 | 2020-05-15 | 南京航空航天大学 | Nano-indentation instrument-based interface shear strength measuring device and testing method |
| CN112945756A (en) * | 2021-02-21 | 2021-06-11 | 扬州升飞检测技术有限公司 | Method for testing shear strength of high-temperature ceramic material |
| CN113218767A (en) * | 2021-06-07 | 2021-08-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | In-situ test method for interface shear strength of fiber reinforced ceramic matrix composite |
| CN113609688A (en) * | 2021-08-09 | 2021-11-05 | 大连理工大学 | Method for accurately judging fiber shearing and bending failure in microscopic cutting simulation of composite material |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157362A (en) * | 2020-01-14 | 2020-05-15 | 南京航空航天大学 | Nano-indentation instrument-based interface shear strength measuring device and testing method |
| CN111157362B (en) * | 2020-01-14 | 2021-05-25 | 南京航空航天大学 | Nano-indentation instrument-based interface shear strength measuring device and testing method |
| CN112945756A (en) * | 2021-02-21 | 2021-06-11 | 扬州升飞检测技术有限公司 | Method for testing shear strength of high-temperature ceramic material |
| CN113218767A (en) * | 2021-06-07 | 2021-08-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | In-situ test method for interface shear strength of fiber reinforced ceramic matrix composite |
| CN113609688A (en) * | 2021-08-09 | 2021-11-05 | 大连理工大学 | Method for accurately judging fiber shearing and bending failure in microscopic cutting simulation of composite material |
| CN113609688B (en) * | 2021-08-09 | 2024-03-29 | 大连理工大学 | Accurate judging method for fiber shearing and bending failure in composite material microscopic cutting simulation |
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Inventor after: Niu Xuming Inventor after: Sun Zhigang Inventor after: Liu Yan Inventor after: Song Yingdong Inventor before: Niu Xuming Inventor before: Sun Zhigang Inventor before: Liu Yan Inventor before: Song Yingdong |
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