CN110927044A - Testing device and testing method for out-of-plane permeability of fiber reinforced composite prefabricated part - Google Patents
Testing device and testing method for out-of-plane permeability of fiber reinforced composite prefabricated part Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 54
- 230000035699 permeability Effects 0.000 title claims abstract description 52
- 239000003733 fiber-reinforced composite Substances 0.000 title claims abstract description 7
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000002131 composite material Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000003921 oil Substances 0.000 claims description 21
- 235000019198 oils Nutrition 0.000 claims description 21
- 229920000642 polymer Polymers 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 3
- 239000008158 vegetable oil Substances 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 abstract description 6
- 238000001764 infiltration Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 2
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011157 advanced composite material Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a testing device and a testing method for the out-of-plane permeability of a fiber reinforced composite prefabricated part, wherein the testing device comprises a screw, a cross steel frame, a positioning column, an ultrasonic receiving device, a pressure gauge, an ultrasonic transmitting device, a lower die supporting plate, a lower die plate, a die cavity thickness support, an upper die plate, a measuring gauge and a screw mounting plate, wherein the ultrasonic receiving device is arranged at the center of the upper die plate, an air exhaust hole is formed in the upper die plate close to the center, an injection hole is formed in the center of the lower die plate, the injection hole is connected with an oil inlet hose, and the pressure gauge is arranged on the oil inlet; the testing method comprises the steps of 1, testing operation process; step 2, calculating out-of-plane permeability: and calculating according to an out-of-plane permeability calculation formula to obtain the out-of-plane permeability. The invention has the technical effects that: the permeability in the thickness direction of the composite material can be measured, the infiltration effect of the composite material can be accurately reflected, and the forming quality of the composite material liquid model can be improved.
Description
Technical Field
The invention belongs to the technical field of permeability test, and particularly relates to a device and a method for testing the out-of-plane permeability of a composite material prefabricated part.
Background
The composite material liquid molding technology is that liquid polymer is injected into a closed mold cavity paved with a fiber preformed body, or resin films which are placed into the mold cavity in advance are heated and melted, and the liquid polymer finishes resin/fiber infiltration and is solidified and molded into a product while flowing and filling the mold. The process technology is the main development direction of advanced composite materials with low cost, has the advantages of capability of manufacturing complex components with good surface quality and high precision, low consumption of raw materials and energy and the like, but because in the forming process, the conditions of unsatisfactory infiltration, uneven flow of resin in the molding process and the like often occur, and the conditions are often related to the positions of an injection opening and a discharge opening and the permeability of fiber fabrics. In order to improve the fluidity and the wettability of resin in a mold cavity during RTM injection and better exhaust bubbles, a plurality of new processes are provided: vacuumizing the cavity, and injecting resin by using an injection machine; or resin is injected only by the difference between the internal pressure and the external pressure caused by the vacuum of the cavity. However, these processes lack a means for measuring the permeability of the liquid polymer, and cannot determine the wetting effect of the liquid polymer.
Out-of-plane permeability as used herein refers to permeability through the thickness of the composite. At present, the Darcy's Law is generally used to describe the flow infiltration process of various types of reinforcement materials and preforms. Darcy's law is a typical fundamental equation for the passage of fluids through porous media, namely:
wherein v is the average flow velocity of the liquid in the medium, k is the permeability tensor of the porous medium, μ is the viscosity of the fluid, and Δ p is the pressure difference between the flow front and the injection port. And k is divided into a main permeability kx in the X direction of a coordinate axis, a main permeability ky in the Y direction of the coordinate axis and a main permeability kz in the Z direction of the coordinate axis, wherein kz is the out-of-plane permeability.
Disclosure of Invention
Aiming at the problems in the prior art, the technical problem to be solved by the invention is to provide a device for testing the out-of-plane permeability of a fiber reinforced composite material prefabricated part, which can accurately predict the infiltration defect of a composite material and perfect the molding process of a composite material liquid model. The invention also provides a method for testing the out-of-plane permeability of the composite material prefabricated part by using the testing device.
In order to solve the technical problems:
the invention provides a device for testing the out-of-plane permeability of a fiber reinforced composite prefabricated part, which comprises a screw, a cross steel frame, a positioning column, an ultrasonic receiving device, a pressure gauge, an ultrasonic transmitting device, a lower die supporting plate, a lower die plate, a die cavity thickness support, an upper die plate, a measuring gauge and a screw mounting plate, wherein the cross steel frame is fixedly connected with the screw;
the screw mounting plate is a circular metal plate, four positioning columns are uniformly arranged between the lower surface of the screw mounting plate and the lower die supporting plate, the screw is matched with a threaded hole in the center of the screw mounting plate, the lower end of the screw is connected with a cross steel frame, the end of a supporting rod of the cross steel frame is sleeved on the positioning columns in a sliding mode through a sleeve, an upper template is fixed below the cross steel frame, an ultrasonic receiving device is installed in the center of the upper template, an air exhaust hole is formed in the position, close to the center, of the upper template, and the measuring;
the upper template and the lower template are placed in parallel, the size and the position of the upper template are matched with the inner cavity of the die cavity thickness support, and a sealing ring with a corresponding size is sleeved in a groove below the cylindrical surface of the upper template;
the die cavity thickness support is a cylindrical frame and is arranged on the lower template in a centering mode, the center of the lower template is provided with an injection hole, the injection hole is connected with an oil inlet hose, and a pressure gauge is arranged on the oil inlet hose; the lower die plate and the die cavity thickness support form a die cavity, the lower die plate and the die cavity thickness support are respectively fixed on the lower die supporting plate, and the ultrasonic transmitting device is embedded in the center of the lower die supporting plate.
The invention provides a method for testing the out-of-plane permeability of a composite material prefabricated part by using the testing device, which comprises the following steps of:
1) cutting the prefabricated part into square blocks, and locking the edges of the square blocks of the prefabricated part by using adhesive tapes;
2) wiping the die cavity with alcohol cloth to ensure that no grease or impurities exist in the die cavity; the hose is checked to ensure that the hose is smooth and free of impurities;
3) respectively installing an ultrasonic transmitting device and an ultrasonic receiving device at corresponding positions, and connecting an ultrasonic probe with ultrasonic equipment by using a data cable;
4) the hose for the vacuum pump is connected with an inlet of the buffer tank, an outlet of the buffer tank is connected with an air suction hole on an upper template of the testing device through the hose, an injection hole of the testing device is connected with one side of the lower end of the pressure gauge through the hose with a smaller diameter, and the hose is externally connected to the other side of the lower end of the pressure gauge to serve as an oil inlet hose;
5) adjusting the screw rod, observing the measuring meter, and enabling the upper template to move to a position 10mm away from the lower template and be fixed; clamping an oil inlet hose connected with a pressure gauge by using a dovetail clamp, then opening a vacuum pump, observing the indication change of the pressure gauge, and when the indication of the pressure gauge reaches below-95 kPa and tends to be stable, considering that the air tightness of the testing device is good, and performing a permeability testing experiment;
6) loosening the dovetail clamp, lifting the upper template to be separated from the die cavity of the die cavity thickness support through the adjusting screw, laying the cut and weighed prefabricated part in the die cavity of the die cavity thickness support, and adjusting the screw to enable the upper template to be tightly attached to the prefabricated part, so that the reading of the measuring meter is close to a preset thickness value H, and the difference is preferably 1mm to 2 mm;
7) and clamping an oil inlet hose of the pressure gauge by using a dovetail clamp, then opening a vacuum pump to enable the pressure in the cavity to reach below-95 Kpa, and recording the stable pressure when a certain stable value is reached. Slightly adjusting the screw rod to enable the upper template to continuously descend so that the measurement representation number reaches a preset thickness value H;
8) opening an ultrasonic device and a computer, setting an input signal as a 1-cycle Hanning window modulation signal by the ultrasonic device, setting the frequency as 100kHz, the cycle as 1 and the sampling point as 10000, and adjusting an ultrasonic device to enable a received signal to reach a stable value; opening data in a computer by adopting software, storing input signals, setting a signal acquisition interval to be 100ms, then clicking to store output signals, and starting to record the output signals by the computer;
9) placing the port of the oil inlet hose below the liquid level in the beaker, and opening the dovetail clamp;
10) stopping the test when the liquid polymer is infiltrated to the uppermost layer of the prefabricated part, taking the oil inlet pipe out of the beaker, closing the vacuum pump, and finishing the test operation;
1) the computer processes and analyzes the extracted signals by using MATLAB software to obtain the relation between the displacement distance of the flow front and the time, and draws a graph;
2) calculating formula according to out-of-plane permeability:
wherein η is the viscosity of vegetable oil, phi is the porosity, ZfThe flow front position, m is the fluid mass, ρ is the fluid density, R0Is the injection hole radius; r isfFor a diffusion front spherical radius, Δ P is the pressure difference between the flow front and the injection port, t is the flow time, KeIs the spherical radius r of the diffusion frontfEffective permeability of (C), KzIs the permeability in the Z-axis direction;
and calculating to obtain the out-of-plane permeability.
The invention utilizes the flow ultrasonic technology, on one hand, the sensor is not embedded into the prefabricated part and is not directly contacted with the material to be measured, the sensor can be repeatedly used, and the flow permeation behavior of the liquid polymer in the prefabricated part can not be influenced; on the other hand, in the processing process of the composite material, when the liquid polymer is injected into the prefabricated member, the position of a flow front in the thickness direction can be indirectly measured by utilizing a flow ultrasonic technology, so that the permeability in the thickness direction is calculated, and the out-of-plane permeability is obtained.
The invention has the technical effects that: the permeability in the thickness direction of the composite material can be measured, the infiltration effect of the composite material can be accurately reflected, and the forming quality of the composite material liquid model can be improved.
Drawings
The drawings of the invention are illustrated as follows:
FIG. 1 is a schematic structural diagram of an out-of-plane permeability testing apparatus of the present invention;
FIG. 2 is an assembly view of the cross steel frame, the upper mold plate, etc. of FIG. 1;
FIG. 3 is a schematic view of the assembly of the lower die plate and the die cavity thickness support of FIG. 1;
FIG. 4 is a connection diagram of the testing device of the present invention and a mating component.
In the figure, 1, a screw; 2. a cross steel frame; 3. a positioning column; 4. an ultrasonic receiving device; 5. a seal ring; 6. a pressure gauge; 7. an ultrasonic emitting device; 8. a lower die support; 9. a lower die supporting plate; 10. a lower template; 11. a mold cavity thickness support; 12. mounting a template; 13. a measuring meter; 14. a screw mounting plate; 15. a vacuum pump; 16. a buffer tank; 17. a beaker; 18. and (6) testing the device.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1, the testing device of this embodiment includes a screw 1, a cross steel frame 2, a positioning column 3, an ultrasonic receiving device 4, a pressure gauge 6, an ultrasonic emitting device 7, a lower die supporting plate 9, a lower die plate 10, a die cavity thickness support 11, an upper die plate 12, a measuring gauge 13, and a screw mounting plate 14;
as shown in fig. 1 and 2, the screw mounting plate 14 is a circular metal plate, four positioning columns 3 are uniformly arranged between the lower surface of the screw mounting plate 14 and the lower die supporting plate 9, the screw 1 is matched with a threaded hole at the center of the screw mounting plate 14, the lower end of the screw 1 is connected with a cross steel frame 2, the end of each supporting column of the cross steel frame 2 is sleeved on the positioning column 3 in a sliding mode through a sleeve, an upper template 12 is fixed below the cross steel frame 2 through a screw, an ultrasonic receiving device 4 is installed at the center of the upper template 12, meanwhile, an air suction hole is formed in the upper template 12 close to the center, in order to accurately measure the thickness of a prefabricated part after molding, the measuring meter 13 is installed on a sleeve at the end of.
The upper template 12 is made of transparent materials, the upper template 12 and the lower template 10 are placed in parallel, the size and the position of the upper template 12 are matched with the inner cavity of the die cavity thickness support 11, and the sealing ring 5 with the corresponding size is sleeved in the groove below the cylindrical surface of the upper template 12.
As shown in fig. 1 and 3, the lower template 10 is a circular plate made of a transparent material, the mold cavity thickness support 11 is a transparent cylindrical frame, and is centrally arranged on the lower template 10, an injection hole is formed in the center of the lower template 10, the injection hole is connected with an oil inlet hose, a pressure gauge 6 is mounted on the oil inlet hose, and the pressure gauge displays injection pressure; the lower die plate 10 and the die cavity thickness support 11 form a die cavity, the lower die plate 10 and the die cavity thickness support 11 are fixed on the lower die supporting plate 9 through bolts respectively, and the ultrasonic transmitting device 7 is embedded in the center of the lower die supporting plate 9.
As shown in fig. 1, a lower mold support 8 is provided below the lower mold support plate 9 for supporting.
As shown in fig. 4, the components used in conjunction with the testing apparatus include a vacuum pump 15, a buffer tank 16 and a beaker 17, and the liquid polymer in the beaker 17 is injected into the mold cavity through a hose and then through the injection hole of the lower mold plate of the testing apparatus 18; the buffer tank 16 is connected between the vacuum pump 15 and the testing device 18, and is evacuated from the upper mold. The vacuum pump 15 is used to create a vacuum in the mould cavity and the buffer tank 16 is used to prevent liquid polymer from being sucked into the vacuum pump.
The invention provides a method for testing the out-of-plane permeability of a composite material prefabricated part by using the testing device, which comprises the following steps:
1) cutting the prefabricated member into square blocks with the side length of 10-15cm, and locking the edges of the square blocks of the prefabricated member by using an adhesive tape. The mass of the square blocks is weighed by an electronic scale after the square blocks are dried, the volume fraction of the square blocks of the prefabricated body is calculated according to the mass, the porosity phi of the prefabricated body is obtained, if punching is needed, a punching machine is used for punching for standby, and the punching is a comparative test exploration for the presence and absence of holes in the center of the prefabricated body.
2) Wiping the die cavity with alcohol cloth to ensure that no grease or impurities exist in the die cavity; the hose is checked to ensure that the hose is smooth and free of impurities.
3) And respectively installing the ultrasonic transmitting device and the ultrasonic receiving device at corresponding positions, and connecting the ultrasonic probe with the ultrasonic equipment by using a data cable.
4) The hose for the vacuum pump is connected with the inlet of the buffer tank, the outlet of the buffer tank is connected with the hose for the extraction hole on the upper template of the testing device, the injection hole of the testing device is connected with the hose with the smaller diameter on one side of the lower end of the pressure gauge, and the hose is externally connected on the other side of the lower end of the pressure gauge as an oil inlet hose.
5) Adjusting the screw rod, observing the measuring meter, and enabling the upper template to move to a position 10mm away from the lower template and be fixed; the oil inlet hose connected with the pressure gauge is clamped by the dovetail clamp, then the vacuum pump is opened, the indication change of the pressure gauge is observed, when the indication of the pressure gauge reaches below-95 kPa and tends to be stable, the air tightness of the testing device is considered to be good, and a permeability testing experiment can be carried out.
6) Loosening the forked tail and pressing from both sides, breaking away from the die cavity of die cavity thickness support through adjusting screw lifting cope match-plate pattern, will tailor the prefab of weighing and lay in the die cavity of die cavity thickness support, adjusting screw makes cope match-plate pattern and prefab closely laminate, makes the registration of strapping table be close to predetermined thickness value H, and poor 1mm is suitable to 2 mm.
7) And clamping an oil inlet hose of the pressure gauge by using a dovetail clamp, then opening a vacuum pump to enable the pressure in the cavity to reach below-95 Kpa, and recording the stable pressure when a certain stable value is reached. And slightly adjusting the screw rod to enable the upper template to continuously descend, so that the measurement indication number reaches a preset thickness value H.
8) Opening an ultrasonic device and a computer, setting an input signal as a 1-cycle Hanning window modulation signal by the ultrasonic device, setting the frequency as 100kHz, the cycle as 1 and the sampling point as 10000, and adjusting an ultrasonic device to enable a received signal to reach a stable value; data in the computer is opened by adopting software, an input signal is stored, a signal acquisition interval is set to be 100ms, then an output signal is clicked and stored, and the computer starts to record the output signal.
9) Placing the port of the oil inlet hose below the liquid level in the beaker, and opening the dovetail clamp;
10) stopping the test when the liquid polymer is infiltrated to the uppermost layer of the prefabricated part, taking the oil inlet pipe out of the beaker, closing the vacuum pump, and finishing the test operation;
when multiple sets of experiments are performed, the above steps are repeated.
1) the computer processes and analyzes the extracted signals by using MATLAB software to obtain the relation between the displacement distance of the flow front and the time, and draws a graph;
2) according to the research on the relationship between the structural parameters of the textile preform and the resin permeability of the mold-forming composite material, Jiangjinhua, a doctor thesis, page 19, section 2.2.1, 3D permeability test mechanism, the recorded out-of-plane permeability calculation formula is as follows:
wherein η is the viscosity of vegetable oil, phi is the porosity, ZfThe flow front position, m is the fluid mass, ρ is the fluid density, R0Is the injection hole radius; r isfFor a diffusion front spherical radius, Δ P is the pressure difference between the flow front and the injection port, t is the flow time, KeIs the spherical radius r of the diffusion frontfEffective permeability of (C), KzIs the permeability in the Z-axis direction, i.e., the out-of-plane permeability;
and calculating to obtain the out-of-plane permeability.
The test was repeated and the average permeability was taken.
Claims (3)
1. The testing device for the out-of-plane permeability of the fiber reinforced composite prefabricated part is characterized in that: the device comprises a screw, a cross steel frame, a positioning column, an ultrasonic receiving device, a pressure gauge, an ultrasonic emitting device, a lower die supporting plate, a lower die plate, a die cavity thickness support, an upper die plate, a measuring gauge and a screw mounting plate;
the screw mounting plate is a circular metal plate, four positioning columns are uniformly arranged between the lower surface of the screw mounting plate and the lower die supporting plate, the screw is matched with a threaded hole in the center of the screw mounting plate, the lower end of the screw is connected with a cross-shaped steel frame, the end of a supporting rod of the cross-shaped steel frame is sleeved on the positioning columns in a sliding mode through a sleeve, an upper template is fixed below the cross-shaped steel frame, an ultrasonic receiving device is installed in the center of the upper template, meanwhile, an air exhaust hole is formed in the position, close to the center, of;
the upper template and the lower template are placed in parallel, the size and the position of the upper template are matched with the inner cavity of the die cavity thickness support, and a sealing ring with a corresponding size is sleeved in a groove below the cylindrical surface of the upper template;
the die cavity thickness support is a cylindrical frame and is arranged on the lower template in a centering mode, the center of the lower template is provided with an injection hole, the injection hole is connected with an oil inlet hose, and a pressure gauge is arranged on the oil inlet hose; the lower die plate and the die cavity thickness support form a die cavity, the lower die plate and the die cavity thickness support are respectively fixed on the lower die supporting plate, and the ultrasonic transmitting device is embedded in the center of the lower die supporting plate.
2. The apparatus for testing out-of-plane permeability of a fiber reinforced composite preform as set forth in claim 1, wherein: the upper template, the lower template and the die cavity thickness bracket are made of transparent materials; a lower die support with a supporting function is arranged below the lower die supporting plate.
3. A method for testing the out-of-plane permeability of a composite preform using the testing apparatus of claim 1 or 2, comprising the steps of:
step 1, testing operation process:
1) cutting the prefabricated part into square blocks, and locking the edges of the square blocks of the prefabricated part by using adhesive tapes;
2) wiping the die cavity with alcohol cloth to ensure that no grease or impurities exist in the die cavity; the hose is checked to ensure that the hose is smooth and free of impurities;
3) respectively installing an ultrasonic transmitting device and an ultrasonic receiving device at corresponding positions, and connecting an ultrasonic probe with ultrasonic equipment by using a data cable;
4) the hose for the vacuum pump is connected with an inlet of the buffer tank, an outlet of the buffer tank is connected with an air suction hole on an upper template of the testing device through the hose, an injection hole of the testing device is connected with one side of the lower end of the pressure gauge through the hose with a smaller diameter, and the hose is externally connected to the other side of the lower end of the pressure gauge to serve as an oil inlet hose;
5) adjusting the screw rod, observing the measuring meter, and enabling the upper template to move to a position 10mm away from the lower template and be fixed; clamping an oil inlet hose connected with a pressure gauge by using a dovetail clamp, then opening a vacuum pump, observing the indication change of the pressure gauge, and when the indication of the pressure gauge reaches below-95 kPa and tends to be stable, considering that the air tightness of the testing device is good, and performing a permeability testing experiment;
6) loosening the dovetail clamp, lifting the upper template to be separated from the die cavity of the die cavity thickness support through the adjusting screw, laying the cut and weighed prefabricated part in the die cavity of the die cavity thickness support, and adjusting the screw to enable the upper template to be tightly attached to the prefabricated part, so that the reading of the measuring meter is close to a preset thickness value H, and the difference is preferably 1mm to 2 mm;
7) and clamping an oil inlet hose of the pressure gauge by using a dovetail clamp, then opening a vacuum pump to enable the pressure in the cavity to reach below-95 Kpa, and recording the stable pressure when a certain stable value is reached. Slightly adjusting the screw rod to enable the upper template to continuously descend so that the measurement representation number reaches a preset thickness value H;
8) opening an ultrasonic device and a computer, setting an input signal as a 1-cycle Hanning window modulation signal by the ultrasonic device, setting the frequency as 100kHz, the cycle as 1 and the sampling point as 10000, and adjusting an ultrasonic device to enable a received signal to reach a stable value; opening data in a computer by adopting software, storing input signals, setting a signal acquisition interval to be 100ms, then clicking to store output signals, and starting to record the output signals by the computer;
9) placing the port of the oil inlet hose below the liquid level in the beaker, and opening the dovetail clamp;
10) stopping the test when the liquid polymer is infiltrated to the uppermost layer of the prefabricated part, taking the oil inlet pipe out of the beaker, closing the vacuum pump, and finishing the test operation;
step 2, calculating out-of-plane permeability:
1) the computer processes and analyzes the extracted signals by using MATLAB software to obtain the relation between the displacement distance of the flow front and the time, and draws a graph;
2) calculating formula according to out-of-plane permeability:
wherein η is the viscosity of vegetable oil, phi is the porosity, ZfThe flow front position, m is the fluid mass, ρ is the fluid density, R0Is the injection hole radius; r isfFor a diffusion front spherical radius, Δ P is the pressure difference between the flow front and the injection port, t is the flow time, KeIs the spherical radius r of the diffusion frontfEffective permeability of (C), KzIs the permeability in the Z-axis direction;
and calculating to obtain the out-of-plane permeability.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720746A (en) * | 2021-08-23 | 2021-11-30 | 合肥工业大学 | Device and method for testing permeability of penetrating agent in fiber cloth |
| RU226154U1 (en) * | 2024-01-26 | 2024-05-22 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский национальный исследовательский технический университет им. А.Н. Туполева-КАИ" | Equipment for measuring compactability, permeability of preforms and production of elementary samples, taking into account technological heredity |
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| CN113720746B (en) * | 2021-08-23 | 2022-07-22 | 合肥工业大学 | Device and method for testing permeability of penetrating agent in fiber cloth |
| RU226154U1 (en) * | 2024-01-26 | 2024-05-22 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский национальный исследовательский технический университет им. А.Н. Туполева-КАИ" | Equipment for measuring compactability, permeability of preforms and production of elementary samples, taking into account technological heredity |
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