CN113237775A - Device for testing dynamic tensile mechanical properties of fiber monofilaments at high temperature - Google Patents
Device for testing dynamic tensile mechanical properties of fiber monofilaments at high temperature Download PDFInfo
- Publication number
- CN113237775A CN113237775A CN202110509457.5A CN202110509457A CN113237775A CN 113237775 A CN113237775 A CN 113237775A CN 202110509457 A CN202110509457 A CN 202110509457A CN 113237775 A CN113237775 A CN 113237775A
- Authority
- CN
- China
- Prior art keywords
- rod
- flange
- chuck
- temperature
- air chamber
- 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
- 239000000835 fiber Substances 0.000 title claims abstract description 59
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 239000000523 sample Substances 0.000 claims abstract description 88
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 239000006096 absorbing agent Substances 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 5
- 238000002474 experimental method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 229920006253 high performance fiber Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
- G01N3/18—Performing tests at high or low temperatures
-
- 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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
-
- 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
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- 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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- 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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
- G01N2203/0623—Electrical or magnetic indicating, recording or sensing means using piezoelectric gauges
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a device for testing dynamic tensile mechanical properties of fiber monofilaments at high temperature, which comprises: a dynamic stretching device and a temperature control device; the dynamic stretching device comprises a resistance type strain gauge (2), a high-pressure air chamber (3), a sleeve type bullet (4), a flange (5), an absorber (6), a piezoelectric sensor (7), a combined chuck (9), a sample card (10) and an incident rod (11); the temperature control device comprises a temperature controller (1) and a half-groove-shaped heating probe (8), the heating probe (8) is connected with the temperature controller (1), and the half-groove-shaped heating probe (8) is arranged on the periphery of a combined chuck (9) of the dynamic stretching device. The device has simple design principle and is easy to realize; the design of the groove-shaped heating head is different from that of a common heating box, the heating rate is high, the volume is smaller, the assembly is simple and easy, the disassembly is easy, and the groove-shaped heating head is suitable for various stretching devices; the piezoelectric sensor is used for replacing a transmission rod, so that the measurement precision is high, and the interference is small.
Description
Technical Field
The invention belongs to the technical field of fiber mechanical property testing equipment, and particularly relates to a device for testing dynamic tensile mechanical property of a fiber monofilament at a high temperature (normal temperature-400 ℃).
Background
The mechanical property of the fiber is an important index for measuring the structural stability of the fiber, and the relationship between the tensile mechanical response of the material and the loading rate and the environmental temperature is large. At present, the quasi-static tensile mechanical property of the tested fiber mainly depends on a material testing machine, and the most common experimental equipment for testing the dynamic tensile mechanical property of the material is a Hopkinson pull rod. High-performance fibers (carbon fibers, carbon nanotube fibers and the like) are widely used in the fields of aviation, aerospace, industrial application and the like, the extremely complex operating environment enables the constitutive relation and the failure mode of a fiber material under high temperature and high strain rate to have extremely strong research significance, and the development of fiber monofilament dynamic tensile mechanical property testing equipment under the high temperature environment is one of key problems for promoting the research.
According to the conventional Hopkinson pull rod technology, incident wave, transmitted wave and reflected wave signals are measured through strain gauges on an incident rod and a transmitted rod, stress-strain information of a material is obtained through calculation according to a three-wave method, and the size of a sample is generally millimeter magnitude. When the diameter of the tested fiber is micrometer, the generalized wave impedance between the fiber and the rod has larger difference, the amplitude of the transmitted wave is smaller and is close to that of a noise signal, and the transmitted signal is difficult to measure no matter a high-precision semiconductor strain gauge or a traditional resistance-type strain gauge is adopted. Meanwhile, based on the limitation of experimental technology under complex conditions, the research on the dynamic mechanical behavior of the fiber under extreme environmental temperature is still insufficient.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a device for testing the dynamic tensile mechanical property of a fiber monofilament at high temperature (normal temperature to 400 ℃). The invention is developed based on stress wave theory and combining temperature effect and strain rate effect, and is a device for measuring dynamic tensile mechanical property of a fiber monofilament with the diameter of micron magnitude under the environment of high temperature (normal temperature-400 ℃); it is characterized in that: the temperature controller is easy to assemble and disassemble, has small volume and can quickly heat up; the sample card is made of aluminum foil and high-temperature-resistant epoxy resin, is nonflammable and is easy to control the sample gauge length; the high-precision piezoelectric sensor is used for replacing the transmission rod, so that the problem that a strain gauge on the transmission rod cannot measure a transmission wave signal is solved.
The invention uses a high-precision piezoelectric force sensor and designs a dynamic mechanical property measuring device of the fiber monofilament. Meanwhile, the device is provided with a groove-shaped temperature controller, and the temperature controller redesigns a heating probe on the basis of the traditional temperature controller, so that the groove-shaped probe can be freely assembled with the rod system designed by the invention, and the device has the advantages of small volume, quick temperature rise, simplicity in assembly and disassembly and the like. Based on the method, the dynamic tensile mechanical property of the fiber monofilament with the diameter of micron magnitude under the high-temperature environment is tested.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a device for testing the dynamic tensile mechanical property of a fiber monofilament at high temperature comprises a dynamic tensile device and a temperature control device;
the dynamic stretching device comprises a resistance type strain gauge 2, a high-pressure air chamber 3, a sleeve type bullet 4, a flange 5, an absorber 6, a piezoelectric sensor 7, a combined chuck 9, a sample card 10 and an incident rod 11;
the dynamic stretching device is a pull rod along the X main shaft direction and comprises a piezoelectric sensor 7, an incident rod 11, a high-pressure air chamber 3, a sleeve type bullet 4, a flange 5 and an absorber 6; the combined chuck 9 comprises two parts, namely a left chuck and a right chuck; one end of the piezoelectric sensor 7 is arranged on the platform by using a support, and the other end is connected with a left chuck of the combined chuck 9; the incident rod 11 is a penetrating rod penetrating through the high-pressure air chamber 3, one end of the incident rod 11 is connected with the right chuck of the combined chuck 9, and the other end of the incident rod is connected with the flange 5; a resistance type strain gauge 2 is arranged on an incident rod 11 between the high-pressure air chamber 3 and the right chuck of the combined chuck 9; the piezoelectric sensor 7 is positioned at the same axial height with the flange 5, the absorber 6 and the incident rod 11; a sleeve type bullet 4 is arranged on the incident rod 11 between the high-pressure air chamber 3 and the flange 5 and is close to the high-pressure air chamber; the flange 5 is mounted on the absorber 6; the absorber 6 is fixedly arranged on the platform;
the temperature control device comprises a temperature controller 1 and a half-groove-shaped heating probe 8, wherein the heating probe 8 is connected with the temperature controller 1, and the half-groove-shaped heating probe 8 is arranged on the periphery of a combined chuck 9 of the dynamic stretching device.
The incident rod 11 is a rod with a diameter of 2 mm-6 mm and a length of 1000 mm-1500 mm.
The range of the piezoelectric sensor 7 is-22N- +22N, the measurement precision is 0.1mN, the output voltage and force conversion relation is 1V-1N, and the response time is microsecond order.
The left chuck and the right chuck of the combined chuck 9 can be separated, and a sample card 10 is clamped between the left chuck and the right chuck; the fiber to be tested is placed in the center of the sample card 10.
The flange 5 is cylindrical, and the outer diameter is 10 mm-12 mm.
The sleeve type bullet is a hollow round tube with the inner diameter consistent with the diameter of the incident rod 11, the outer diameter consistent with the diameter of the inner wall of the high-pressure air chamber 3 and the length of 150 mm-250 mm, is sleeved on the incident rod 11 in a seamless mode, and is attached to the inner wall of the high-pressure air chamber 3 in a seamless mode. Before the bullet is launched, the sleeve type bullet 4 exists in the high-pressure air chamber 3, and after the inflation is completed, the sleeve type bullet 4 is launched out to collide with the flange 5.
The absorber 6 is fixedly arranged on the platform, is coaxial with the flange 5, has the same height as the flange, and is internally provided with an elastic element for absorbing energy.
The experimental temperature is set by the temperature controller 1, and the heating probe 8 is internally provided with a temperature sensor and a heating resistance wire.
The diameter scale of the fiber monofilament tested by the experiment is micrometer scale, and the piezoelectric sensor 7 directly collects the stress signal on the fiber monofilament.
The sleeve type bullet 4 is inflated and launched by the high-pressure air chamber 3, the impact flange 5 is released, the flange 5 is connected with the incident rod 11 to reflect tensile waves, and the absorber 6 is used for absorbing compression waves generated by impact at the tail end of the incident rod 11, so that repeated loading of the tensile waves reflected from the right end of the flange 5 on the incident rod 11 is avoided.
The sleeve bullet 4 releases the impact flange 5 from the high pressure air chamber 3 at a certain speed, the flange 5 is connected with the incident rod 11 to reflect the tensile wave, and the absorber 6 is arranged at the tail end of the incident rod 11 to absorb the compression wave generated by the impact.
The combined chuck 9 consists of a left chuck and a right chuck. The left chuck is connected with the piezoelectric sensor 7, the right chuck is connected with the incident rod 11, the middle part of the chuck is used for clamping the sample card 10, and the resistance type strain gauge 2 is positioned on the incident rod 11.
The temperature control device comprises a temperature controller 1 and a half-groove-shaped heating probe 8, and the heating probe 8 is connected with the temperature controller 1 through a lead. The experimental temperature is set by the temperature controller 1, and the heating probe 8 is internally provided with a temperature sensor and a heating resistance wire. The heating tip 8 may be held around the sample holder 9 of the dynamic tensioning device using a holding tool.
The diameter of the fiber monofilaments experimentally tested is on the order of microns.
The specific working principle is as follows:
before the experiment, the preparation of the sample is required to be completed, the fiber to be tested is placed in the center of a sample card 10 made of aluminum foil, and the scale distance l of the fiber samplesAnd the two ends of the sample are bonded by using high-temperature-resistant epoxy resin through the size control of a clamping groove of the sample card. Before the experiment begins, a sample is clamped on a clamp of a rod, a sample card 10 is cut off, and the fact that the sample fiber is the only stressed object in the dynamic stretching process is guaranteed.
The environmental temperature of the sample during the experiment is set by the groove-shaped temperature control box 1 designed by the invention, and the heating probe 8 can be fixed on the rod system. After the experiment temperature is set, the rod system and the sample are heated together until the environmental temperature is stable, and then the test is carried out.
Based on the direct Hopkinson pull rod, the invention redesigns a dynamic stretching rod piece system. Since the measured fiber diameter is generally in the micrometer order, the generalized wave impedance between the fiber and the rod has a large difference, and the amplitude of the transmitted wave is too small to be almost covered by noise. In order to solve the problem, the transmission rod is replaced by a piezoelectric sensor with high precision and high response speed. The high-pressure air chamber 3 releases air pressure to accelerate the sleeve type bullet 4, after the bullet impacts the flange 5 at a speed v, the stretching wave is reflected by the flange and then is transmitted to the right end of the sample along the incident rod 11 to stretch and load the sample, and the electric signal measured by the resistance type strain gage 2 on the incident rod 11 is U1Electric powerThe transformation coefficient of the signal and the strain signal is k1The measured strain signal is
Meanwhile, the piezoelectric sensor directly measures the stress electric signal of the fiber as U2The conversion coefficient of the electrical signal and the force signal is k2The force on the filament of the fiber is measured as
Stress on the fiber is
(wherein, A)sThe cross-sectional area of the sample). Since the transmitted wave signal is extremely weak, ε can be considered as being the same as that in the three-wave methodt＝0，εr＝εi，εi、εt、εrRespectively an incident wave signal, a transmitted wave signal and a reflected wave signal. Thus, according to the one-dimensional stress wave theory, the wave velocity of the stress wave on the incident rod is
(E, rho is the elastic modulus and material density of incident rod), and the loading speed of the fiber monofilament is v ═ C0ε＝C0(εi-εr-εt)＝2C0εiThe strain rate of the fiber is
(wherein lsIs the gauge length of the sample), the strain of the fiber during dynamic loading is
The invention has the following advantages:
(1) the design principle is simple and easy to realize;
(2) the design of the groove-shaped heating head is different from that of a common heating box, the heating rate is high, the volume is smaller, the assembly is simple and easy, the disassembly is easy, and the device is suitable for various fiber drawing devices;
(3) the piezoelectric sensor is used for replacing a transmission rod, so that the measurement precision is high, and the interference is small.
The following is further described by way of examples and figures thereof.
Drawings
FIG. 1 is a structural diagram of a device for testing the dynamic tensile mechanical properties of a fiber monofilament at high temperature, which is designed by the invention;
FIG. 2 is a detailed view and an internal structure view of the half-channel type heating probe of the present invention.
In the figure: 1-a temperature controller; 2-strain gauge; 3-a high-pressure air chamber; 4-a sleeve bullet; 5-a flange; 6-an absorber; 7-a piezoelectric sensor; 8-a half-groove-shaped heating probe; 9-a combined chuck; 10-sample card; 11-an incident rod; 12-thermal resistance; 13-temperature sensor.
Detailed Description
The invention will be described in detail below with reference to the accompanying fig. 1-2 and the specific embodiments. The following examples are only for explaining the present invention, the scope of the present invention shall include the full contents of the claims, and the full contents of the claims of the present invention can be fully realized by those skilled in the art through the following examples.
Example 1
FIG. 1 is a structural diagram of a device for testing the dynamic tensile mechanical properties of fiber monofilaments at high temperature (normal temperature to 400 ℃) in accordance with the present invention. As shown in figure 1, the device for testing the dynamic tensile mechanical property of the fiber monofilaments at high temperature comprises a temperature controller 1, a resistance type strain gauge 2, a high-pressure air chamber 3, a sleeve type bullet 4, a flange 5, an absorber 6, a piezoelectric sensor 7, a half-groove-shaped heating probe 8, a combined chuck 9, a sample card 10 and an incident rod 11.
The device for testing the dynamic tensile mechanical property of the fiber monofilaments at high temperature comprises a dynamic tensile device and a temperature control device.
The dynamic stretching device comprises a resistance type strain gauge 2, a high-pressure air chamber 3, a sleeve type bullet 4, a flange 5, an absorber 6, a piezoelectric sensor 7, a combined chuck 9, a sample card 10 and an incident rod 11. The dynamic stretching device is a pull rod along the X main shaft direction and mainly comprises a piezoelectric sensor 7, an incident rod 11, a high-pressure air chamber 3, a sleeve type bullet 4, a flange 5 and an absorber 6. The incident rod 11 was a 6mm diameter, 1000mm long steel rod, a piezoelectric transducer 7(Kistler 9712B5, resolution 0.1mN, range 22N). The combined chuck 9 comprises two parts, namely a left chuck and a right chuck which can be separated from each other, and a screw is respectively arranged on the left chuck and the right chuck, and a sample card can be clamped by screwing the screws. A sample card 10 is clamped between the left chuck and the right chuck; the fiber to be tested is placed in the center of a sample card 10 made of aluminum foil, the gauge length ls of a fiber sample is controlled through the size of a clamping groove of the sample card 10, and two ends of the sample are bonded by high-temperature-resistant epoxy resin. Before the experiment is started, a sample is clamped on a combined chuck 9 of a rod, a sample card 10 is sheared, and the fact that the sample fiber is the only stressed object in the dynamic stretching process is guaranteed. One end of the piezoelectric sensor 7 is arranged on the platform by using a support, and the other end is connected with a left chuck of the combined chuck 9. The incident rod 11 is a penetrating rod penetrating through the high-pressure air chamber 3, one end of the incident rod 11 is connected with the right chuck of the combined chuck 9, and the other end of the incident rod is in threaded connection with the flange 5. The resistance type strain gauge 2 is installed on the incident rod 11 between the high pressure air chamber 3 and the right chuck of the combined chuck 9. The flange 5 is a disc shape, the outer diameter is 10mm, the material is the same as that of the incident rod, and the flange is made of steel. The piezoelectric sensor 7 is positioned at a coaxial height with the flange 5, the absorber 6, and the incident rod 11. The incident rod 11 penetrates through the high-pressure air chamber 3, a sleeve type bullet 4 is arranged on the incident rod 11 between the high-pressure air chamber 3 and the flange 5 and is close to the high-pressure air chamber, and a round tube of the sleeve type bullet (the material of the inner diameter is 6mm, the outer diameter is 10mm, and the length is 200mm is the same as that of the incident rod and is made of steel) is sleeved on the incident rod 11. The flange 5 is mounted on the absorber 6. The absorber 6 (concentric with the incident rod 11 and containing an elastic element) is fixedly arranged on the platform.
The temperature control device comprises a temperature controller 1 and a half-groove-shaped heating probe 8, and the heating probe 8 is connected with the temperature controller 1 through a lead. The experimental temperature is set by the temperature controller 1, and the heating probe 8 is internally provided with a temperature sensor and a heating resistance wire. The heating probe 8 is a half-groove-shaped heating probe, and can be clamped on the periphery of the combined chuck 9 of the dynamic stretching device by using a fixing tool.
The dynamic tensile mechanical property testing device is a rod piece system with the diameter of 6mm (the diameter of an incident rod), and the temperature control device consists of a temperature controller 1 and a half-groove type heating probe 8.
The sleeve type bullet 4 is inflated and launched by the high-pressure air chamber 3, the impact flange 5 is released at a certain speed, the flange 5 is connected with the incident rod 11 to reflect tensile waves, and the absorber 6 is used for absorbing compression waves generated by impact at the tail end of the incident rod 11, so that repeated loading of the incident rod 11 by the tensile waves reflected from the right end of the flange 5 is avoided.
The combined chuck 9 is a sample clamp, a sample card 10 is clamped in the middle of the combined chuck 9, and the piezoelectric sensor 7 directly collects a stress signal on the fiber monofilament. And the half-groove type heating probe 8 is connected with the temperature controller 1, clamped on the periphery of a combined chuck 9 of the dynamic stretching device and used for heating a fiber sample to be tested.
Fig. 2 is a detailed view and an internal structure view of a half-slot type heating probe, which includes a thermal resistor 12 and a temperature sensor 13 for heating and measuring an experimental temperature.
The device for testing the dynamic tensile mechanical property of the fiber monofilament at the high temperature has the following use process:
when testing the dynamic tensile mechanical properties of the fiber monofilaments at high temperature, the preparation of the sample is firstly completed before the start of the experiment: the fiber to be tested is placed in the center of a sample card 10 made of aluminum foil, and the scale distance l of the fiber samplesAnd the two ends of the sample are bonded by using high-temperature-resistant epoxy resin through the size control of a clamping groove of the sample card. Before the experiment is started, a sample is clamped and fixed on the combined chuck 9, and two ends of the sample card 10 are cut off, so that the fiber sample is the only stressed object in the dynamic stretching process.
At the same time, the half-channel heating probe 8 is loaded onto the rod system and the experimental temperature is set on the temperature controller 1. After the experiment temperature is set, the rod system (the rod system refers to a dynamic stretching device) and the sample are heated together until the experiment temperature is stable, and then the test is carried out. And after the temperature is stable, releasing the gas in the high-pressure gas chamber 3 to enable the sleeve type bullet 4 to impact the flange 5 at high speed. After the bullet has hit the flange 5 with a velocity v, the tensile wave passesAfter being reflected by the flange 5, the reflected signal is transmitted to the right end of the sample along the incident rod 11 leftwards, the fiber sample is subjected to tensile loading, and a voltage signal measured by the resistance type strain gauge 2 on the incident rod 11 is U1(V) the conversion coefficient of the electric signal and the strain signal is k1(V) the measured strain signal is
Meanwhile, the piezoelectric sensor 11 directly measures the stress voltage signal of the fiber as U2(V) the conversion coefficient of the electrical signal and the force signal is k2(V/N) and the force on the fiber filament is measured as
Stress on the fiber is
(wherein, A)sIs the cross-sectional area (m) of the sample2)). Since the transmitted wave signal is extremely weak, ε can be considered as being the same as that in the three-wave methodt＝0，εr＝εi，εi、εt、εiRespectively an incident wave signal, a transmitted wave signal and a reflected wave signal. Thus, according to the one-dimensional stress wave theory, the wave velocity of the stress wave on the incident rod is
(E (Pa) is the elastic modulus of the incident rod, ρ (kg/m)3) Material density of incident rod), the loading speed of the fiber monofilament is v ═ C0ε＝C0(εi-εr-εt)＝2C0εiThe strain rate of the fiber is
(wherein ls(m) is the gauge length of the sample), the strain of the fiber during dynamic loading is
The experimental temperature of the fiber sample is set by the temperature controller 1 designed by the invention, the half-groove type heating probe 8 comprises a thermal resistor 12 and a temperature sensor 13, after the temperature setting is finished, the thermal resistor 12 is powered on to start heating, the temperature control box 1 stops heating after the ambient temperature detected by the temperature sensor 13 reaches the set temperature, and when the temperature is lower than the set temperature by 10 ℃, the temperature control box 1 restarts heating. The half-groove type heating probe 8 can be fixed on the periphery of a sample clamp of the dynamic tensile mechanical property testing device.
It should be noted that, according to the above embodiments of the present invention, those skilled in the art can fully implement the full scope of the present invention as defined by the independent claims and the dependent claims, and implement the processes and methods as the above embodiments; and the invention has not been described in detail so as not to obscure the present invention.
The above description is only a part of the embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The device for testing the dynamic tensile mechanical property of the fiber monofilament at the high temperature is characterized by comprising a dynamic stretching device and a temperature control device;
the dynamic stretching device comprises a resistance type strain gauge (2), a high-pressure air chamber (3), a sleeve type bullet (4), a flange (5), an absorber (6), a piezoelectric sensor (7), a combined chuck (9), a sample card (10) and an incident rod (11);
the dynamic stretching device is a pull rod along the X main shaft direction and comprises a piezoelectric sensor (7), an incident rod (11), a high-pressure air chamber (3), a sleeve type bullet (4), a flange (5) and an absorber (6); the combined chuck (9) comprises a left chuck and a right chuck; one end of the piezoelectric sensor (7) is arranged on the platform by using a fixed support, and the other end of the piezoelectric sensor is connected with a left chuck of the combined chuck (9); the incident rod (11) is a penetrating rod penetrating through the high-pressure air chamber (3), one end of the incident rod (11) is connected with the right chuck of the combined chuck (9), and the other end of the incident rod is connected with the flange (5); a resistance type strain gauge (2) is arranged on an incident rod (11) between the high-pressure air chamber (3) and the right chuck of the combined chuck (9); the piezoelectric sensor (7) is positioned at the same axial height with the flange (5), the absorber (6) and the incident rod (11); a sleeve type bullet (4) is arranged on the incident rod (11) between the high-pressure air chamber (3) and the flange (5) and is close to the high-pressure air chamber; the flange (5) is arranged on the absorber (6); the absorber (6) is fixedly arranged on the platform;
the temperature control device comprises a temperature controller (1) and a half-groove-shaped heating probe (8), wherein the half-groove-shaped heating probe (8) is connected with the temperature controller (1), and the half-groove-shaped heating probe (8) is arranged on the periphery of a combined chuck (9) of the dynamic stretching device.
2. The device according to claim 1, wherein the entrance rod (11) is a rod having a diameter of 2mm to 6mm and a length of 1000mm to 1500 mm.
3. The device according to claim 1, characterized in that the range of the piezoelectric sensor (7) is-22N to +22N, the measurement accuracy is 0.1mN, the output voltage and force conversion relation is 1V to 1N, and the response time is microsecond order.
4. The device according to claim 1, characterized in that the sample card (10) is made of aluminum foil and high temperature (450 ℃) resistant epoxy, the fibers to be tested being placed in the center of the sample card (10).
5. The device according to claim 1, characterized in that the left and right jaws of the combined jaw can be separated, said left and right jaws holding a sample card (10) in between; the flange (5) is cylindrical, and the outer diameter is 10 mm-12 mm.
6. The device according to claim 1, wherein the sleeve-type bullet 4 is a hollow circular tube with an inner diameter consistent with the diameter of the incident rod (11), an outer diameter consistent with the diameter of the inner wall of the high-pressure air chamber (3) and a length of 15cm to 25cm, and is seamlessly sleeved on the incident rod (11) and seamlessly and tightly attached to the inner wall of the high-pressure air chamber (3); before the bullet is launched, the sleeve type bullet (4) exists in the high-pressure air chamber (3), and after the inflation is finished, the sleeve type bullet (4) is launched out to collide with the flange.
7. The device according to claim 1, characterized in that the absorber (6) is fixedly mounted on the platform at a coaxial height with the flange (5) and contains elastic elements for absorbing energy.
8. The device according to claim 1, characterized in that the experimental temperature is set by the temperature controller (1), and the heating probe (8) contains a temperature sensor and a heating resistance wire.
9. Device according to claim 1, characterized in that the diameter dimension of the experimentally tested fiber monofilament is in the micrometer range, and the piezo sensor (7) directly collects the force signal on the fiber monofilament.
10. The device according to claim 1, characterized in that the telescopic bullet (4) is inflated and launched by the plenum (3) to release the impact flange (5), the flange (5) being connected to the entrance rod (11) to reflect the tensile wave, and the absorber (6) being provided at the end of the entrance rod (11) to absorb the compression wave generated by the impact, avoiding multiple loading of the entrance rod (11) by the tensile wave reflected from the right end of the flange (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110509457.5A CN113237775A (en) | 2021-05-11 | 2021-05-11 | Device for testing dynamic tensile mechanical properties of fiber monofilaments at high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110509457.5A CN113237775A (en) | 2021-05-11 | 2021-05-11 | Device for testing dynamic tensile mechanical properties of fiber monofilaments at high temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113237775A true CN113237775A (en) | 2021-08-10 |
Family
ID=77133369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110509457.5A Pending CN113237775A (en) | 2021-05-11 | 2021-05-11 | Device for testing dynamic tensile mechanical properties of fiber monofilaments at high temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113237775A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115326564A (en) * | 2022-08-09 | 2022-11-11 | 中国人民解放军陆军工程大学 | Fiber bundle dynamic tensile property testing device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202886209U (en) * | 2011-12-18 | 2013-04-17 | 西北工业大学 | High-temperature high-strain rate stretching synchronization experimental apparatus |
| US20190033188A1 (en) * | 2015-12-18 | 2019-01-31 | Northwestern Polytechnical University | Electromagnetic induction type hopkinson tension-compression bar loading device and experiment method |
| CN110196198A (en) * | 2019-05-16 | 2019-09-03 | 西北工业大学 | Can accurate quantification Electromagnetic Control high temperature Hopkinson bar tensile test apparatus and method |
| CN110296898A (en) * | 2019-06-28 | 2019-10-01 | 天津大学 | The Hopkinson pull rod device and method of coupled static-dynamic loadingi in a kind of hot environment |
| CN111579384A (en) * | 2020-05-06 | 2020-08-25 | 山东南山铝业股份有限公司 | High temperature environment metal material tensile test system |
| CN112540007A (en) * | 2020-12-07 | 2021-03-23 | 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 |
-
2021
- 2021-05-11 CN CN202110509457.5A patent/CN113237775A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202886209U (en) * | 2011-12-18 | 2013-04-17 | 西北工业大学 | High-temperature high-strain rate stretching synchronization experimental apparatus |
| US20190033188A1 (en) * | 2015-12-18 | 2019-01-31 | Northwestern Polytechnical University | Electromagnetic induction type hopkinson tension-compression bar loading device and experiment method |
| CN110196198A (en) * | 2019-05-16 | 2019-09-03 | 西北工业大学 | Can accurate quantification Electromagnetic Control high temperature Hopkinson bar tensile test apparatus and method |
| CN110296898A (en) * | 2019-06-28 | 2019-10-01 | 天津大学 | The Hopkinson pull rod device and method of coupled static-dynamic loadingi in a kind of hot environment |
| CN111579384A (en) * | 2020-05-06 | 2020-08-25 | 山东南山铝业股份有限公司 | High temperature environment metal material tensile test system |
| CN112540007A (en) * | 2020-12-07 | 2021-03-23 | 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 |
Non-Patent Citations (1)
| Title |
|---|
| 薛晓等: "碳纳米管纤维的动态拉伸力学性能研究", 《实验力学》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115326564A (en) * | 2022-08-09 | 2022-11-11 | 中国人民解放军陆军工程大学 | Fiber bundle dynamic tensile property testing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105259039A (en) | Micro-force testing system based on cantilever beam and testing method of micro-force testing system | |
| CN112179553B (en) | Method for ultrasonically and synchronously measuring axial force and shearing force of bolt | |
| Song et al. | Improved Kolsky tension bar for high-rate tensile characterization of materials | |
| CN204718885U (en) | Material Micro Mechanical Properties is biaxial stretch-formed-fatigue test system | |
| CN105606453B (en) | A kind of large-sized composite material beanpod bar is compressed axially the test system of performance | |
| Guillaud et al. | Impact response of thick composite plates under uniaxial tensile preloading | |
| CN104677746A (en) | Testing device and testing method for high-temperature fatigue property of microelement under compound stress | |
| CN111060390A (en) | High-efficiency high-temperature stretching clamping device and testing method | |
| CN113237775A (en) | Device for testing dynamic tensile mechanical properties of fiber monofilaments at high temperature | |
| CN105910919A (en) | High-temperature axial compression testing device and testing method | |
| CN115901501A (en) | Dynamic torsion-stretching/compressing synchronous combined loading device and loading method | |
| Yu et al. | A review of the torsional split Hopkinson bar | |
| Naik et al. | Shear properties of epoxy under high strain rate loading | |
| CN211122349U (en) | Hopkinson pull rod device with dynamic and static combination loading in high-temperature environment | |
| CN113607545B (en) | Single pulse separation type Hopkinson pull rod experimental device based on electromagnetic force loading | |
| CN113640118B (en) | Material in-situ dynamic tensile loading test device | |
| CN204536132U (en) | Micro structures fatigue at high temperature performance testing device under compound stress | |
| CN101413782A (en) | Double-shaft radial extensometer under high hydraulic environment | |
| CN212110919U (en) | Concrete axle draws testing arrangement | |
| CN111551463A (en) | High-temperature pulse dynamic strain calibration device | |
| Xu et al. | Application of split Hopkinson tension bar technique to the study of dynamic fracture properties of materials | |
| CN205138897U (en) | Test system of doing all can a little based on cantilever beam | |
| US7150200B1 (en) | Miniature axisymmetric streamline tensile (MAST) specimen | |
| CN211697236U (en) | High-efficient high-temperature stretching clamping device | |
| Zhaoyuan et al. | Structural health monitoring using magnetostrictive sensors |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210810 |