CN108871963B - Testing method of pipe wall crack propagation speed testing device - Google Patents
Testing method of pipe wall crack propagation speed testing device Download PDFInfo
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- CN108871963B CN108871963B CN201810442083.8A CN201810442083A CN108871963B CN 108871963 B CN108871963 B CN 108871963B CN 201810442083 A CN201810442083 A CN 201810442083A CN 108871963 B CN108871963 B CN 108871963B
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- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- 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
Abstract
The invention discloses a testing method of a pipe wall crack propagation speed testing device, which comprises the following steps: (1) polishing the surface of the outer wall surface of the metal pipe at the position where the time probe unit is installed by using a grinding machine, installing a linear energy-gathering cutter on the center of the metal pipe, winding the time probe unit around the metal pipe along the installation position of the pipe wall, and communicating a pressurizing device with the metal pipe; (2) one end of each time probe unit is connected with the anode of a stabilized voltage power supply through a resistance element, and the other end of each time probe unit is connected with the cathode of the stabilized voltage power supply; the signal input end of each channel of the dynamic signal acquisition system is respectively connected with the anode of each resistance element; the data output end of the dynamic signal acquisition system is connected with the computer; (3) step type interval pause pressurization; (4) and drawing a distance-speed curve to obtain the corresponding crack propagation interval speed when the crack propagates to the corresponding position. According to the testing method, the voltage step signal is displayed on the resistor by utilizing the fracture signal, and the testing method is safe and reliable.
Description
Technical Field
The invention relates to a testing method of a pipe wall crack propagation speed testing device, and belongs to the technical and safety field of gas-liquid high-pressure pipeline conveying engineering.
Background
In the operation process of the high-pressure gas transmission pipeline, due to the change of pressure in the pipeline, the fatigue or damage of pipeline materials, external action and the like, the pipeline has a crack on a certain position, and then the pipeline is extended for a long distance, so that not only can serious economic loss and environmental pollution be caused, but also disastrous accidents such as ground casualties, damage to buildings and facilities and the like can be caused. Therefore, in order to reduce the loss as much as possible and accelerate the emergency repair process after the accident, the research on the mechanical behavior of crack formation and expansion of the large-caliber high-pressure metal pipeline is widely carried out at home and abroad. Research shows that structural crack arrest control is an effective control method for ductile crack arrest of a gas transmission metal pipeline, and a high-pressure metal pipe blasting test is an important means for researching structural crack arrest control.
Pressurization in the gas transmission metal pipe to a target value is one of the preconditions and important links for implementing the air pressure blasting test of the high-pressure metal gas transmission pipe. The crack propagates along the pipe wall under the action of high-pressure gas, and the pressure relief of the crack also causes the propagation of decompression waves in the high-pressure pipe. The crack-stopping toughness of the metal pipe can be determined by comparative analysis through testing the propagation speed of the crack on the pipe wall and the propagation speed of the gas decompression wave in the pipe and observing the crack-stopping position of the crack. Therefore, the reasonably designed pressurization device in the gas metal pipe and the metal pipe crack propagation speed testing method are one of the key problems of the full-size blasting test.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a testing method of a pipe wall crack propagation speed testing device.
The technical scheme is as follows: in order to solve the technical problems, the testing device comprises a pressurizing device, a high-pressure gas transmission metal pipe communicated with the pressurizing device, a plurality of time probe units and a dynamic signal acquisition system, wherein the pressurizing device comprises a high-pressure gas transmission pipe for transmitting high-pressure gas to the metal pipe, a first type of air compression device, a second type of air compression device and a third type of air compression device, the high-pressure gas transmission pipe is communicated with the metal pipe through a primary valve, the first type of air compression device is arranged on the high-pressure gas transmission pipe, the tail end of the high-pressure gas transmission pipe is provided with a three-way converter, the three-way converter is respectively connected with the second type of air compression device and the third type of air compression device, a linear energy-gathering cutter is arranged on the wall of a central pipe of the metal pipe, the time probe units are wound on the metal pipe, each time probe unit and one resistance element are connected in series to form a parallel branch, a voltage-stabilized power supply supplies power to each parallel branch, each channel of a dynamic signal acquisition system respectively acquires the voltage of the resistance element in each parallel branch, the output end of the dynamic signal acquisition system is connected with a computer, the time probe unit is an enameled copper wire with the diameter of 0.2-0.8 mm and the length of the enameled copper wire being the perimeter of the outer wall surface of a metal pipe, the arrangement interval of the time probe unit on the pipe wall is 0.25-1.0 m, the center of the time probe unit is positioned on a pipe wall bus where an initial crack is positioned, the time probe unit is arranged on the outer wall surface of the metal pipe by 180 degrees around the section of the metal pipe and is perpendicular to the pipe wall bus, and:
(1) polishing and derusting the outer wall surface of the metal pipe at the position where the time probe unit is installed by using a polisher, installing a linear energy gathering cutter on the center of the metal pipe and parallel to a bus of the metal pipe, winding the time probe unit around the metal pipe along the installation position of the pipe wall, fixing the time probe unit by using 502 glue, covering the time probe unit by using epoxy resin adhesive glue to enable the time probe unit to be tightly adhered to the pipe wall, and communicating a pressurizing device with the metal pipe;
(2) one end of each time probe unit is connected with the anode of a stabilized voltage power supply through a resistance element, and the other end of each time probe unit is connected with the cathode of the stabilized voltage power supply; the signal input end of each channel of the dynamic signal acquisition system is respectively connected with the anode of each resistance element, and the grounding end is connected with the cathode of each resistance element; the data output end of the dynamic signal acquisition system is connected with the computer;
(3) pressurizing by adopting a first type of air compression device, when the pressure in the pipe is less than or equal to 2MPa, pausing for 15 minutes according to 1MPa as a step value, and pressurizing to 2MPa again; when the pressure in the pipe is more than 2MPa, the pressure is suspended for 10 minutes according to 0.5MPa as a step value until the pressure is 4 MPa;
(4) pressurizing by adopting a B and a third type air compression device, when the pressure in the pipe is less than or equal to 8MPa, pausing the pressurization for 10 minutes according to 0.5MPa as a step value, and then pressurizing to 8 MPa; when the pressure in the pipe is more than 8MPa, the pressurizing is suspended for 10 minutes according to 0.25MPa as a step value until the pressure reaches the target pressure value of the metal pipe;
(5) setting the initial crack tip position L 00, time t at which the initial crack position time probe unit forms a voltage step signal0Is 0; the remaining time probe units are marked L in turn from the initial crack1、L2、L3……LnThe time of forming the voltage step signal on the corresponding computer is sequentially recorded as t1、t2、t3…，ti，…tnWherein L isiDenotes the distance, t, from the ith time probe unit to the initial fracture tipiRepresents the time for the crack to propagate to the ith time probe unit; the average velocity V of the crack through the adjacent time probe celli=(Li-Li-1)∕(ti- ti-1) Wherein i =1, 2, 3 … … n; then by a displacement [ (L)i-Li-1)∕2+ Li]Is the X axis and the speed ViAnd drawing a distance-speed curve for the Y axis, so as to obtain the corresponding crack propagation interval speed when the crack propagates to the corresponding position.
According to the invention, a time probe unit, a resistance element and a stabilized voltage power supply are connected into a closed loop, a dynamic signal acquisition system is used for acquiring the voltage of the resistance element, a voltage step signal is formed by utilizing the change of the on-off state of the time probe unit so as to obtain the arrival time of the crack tip, and the crack propagation interval speed is indirectly obtained by the time difference generated by the two step signals.
In the invention, the mechanical and electrical properties of the material are comprehensively considered, and the enameled copper wire with the diameter of 0.2-0.8 mm is selected as a time probe unit, so that the enameled copper wire has certain dynamic tensile strength to bear the action of blasting impact load and can be synchronously broken along with the cracking of the tube wall; the length of the time probe unit (time line) should be equal to the perimeter of the outer wall surface of the metal tube to ensure reliable acquisition of the fracture signal and facilitate connection with the testing device and self-protection. According to the crack propagation characteristics of the high-pressure high-toughness metal pipe, the metal pipe cracks start from two ends of the initial cracks during testing and expand along the axial direction of the metal pipe, and when the crack arrest condition is achieved, the expansion direction can deflect. In order to accurately test the expansion speed of each stage of the metal pipe crack, the center of the time probe unit is positioned on a pipe wall generatrix where the initial crack is positioned, and the symmetrical center point is arranged on the outer wall surface of the metal pipe by 180 degrees around the section of the metal pipe and is vertical to the pipe wall generatrix. The estimated propagation speed of the cracks of the high-pressure high-toughness metal pipe is 100-350 m/s, so that the change of the crack speed can be accurately captured, and the arrangement interval of the time probe units is preferably 0.25-1.0 m.
In the invention, the air inlet of the tube body is arranged at the top of the metal tube body and is 1.8 meters away from the end part, a first type of air compression device is adopted for pressurization, a high-pressure delivery pipe of the air compression device is connected with a corresponding secondary valve in a threaded connection mode, and high-pressure air is delivered into the tube through a primary valve. When the pressure in the pipe is less than or equal to 2MPa, the pressure is suspended for 15 minutes according to 1MPa as a step value, and then the pressure is increased to 2 MPa; and during the pause period, the sealing conditions of the installation part and the welding part of the test metal pipe body and the test unit are checked in a mode of approaching to the test, checking a pressure indicator of the air compression device and the like. When the pressure in the pipe is more than 2MPa, the pressure is suspended for 10 minutes according to 0.5MPa as a step value until the pressure is 4 MPa; the seal is checked in the same way during the pause.
After the pressure in the pipe reaches 4MPa, closing a secondary valve corresponding to the first type of air compression device; and B and a third type of air compression device are adopted for pressurization. When the pressure in the pipe is less than or equal to 8MPa, the pressure is temporarily stopped for 10 minutes according to 0.5MPa as a step value, and then the pressure is increased to 8 MPa; when the pressure in the pipe is more than 8MPa, the pressure is suspended for 10 minutes according to 0.25MPa as a step value until the pressure reaches 12MPa, and at the moment, the primary valve is closed to wait for the test. The state of each unit of the pressurization system is monitored by various means such as a pressure indicator of the air compression device during the pause, remote video monitoring, real-time data transmission monitoring of pressure sensors at different positions and the like.
Has the advantages that: according to the pipe wall crack propagation speed testing device for the metal pipe air pressure explosion test, the time probe unit is tightly adhered to the metal pipe wall, so that pipe wall opening and disconnection of the time probe can be synchronously performed, and the accuracy of test data is improved; according to the testing method, the voltage step signal is displayed on the resistor by utilizing the fracture signal, and the testing method is safe and reliable.
Drawings
Fig. 1 is a detailed structural diagram of the pressurization system of the present invention.
FIG. 2 is a schematic diagram of the pressurized system of the present invention.
FIG. 3 is a schematic diagram of the connection of the testing device of the present invention.
Fig. 4 is a schematic diagram of the circuit design of fig. 3 of the present invention.
Fig. 5 is a schematic view of the installation position of the time probe unit of the present invention.
Fig. 6 is a schematic view of the time probe unit installation spacing of the present invention.
Fig. 7 is a waveform diagram displayed on the dynamic signal acquisition system of the present invention.
Fig. 8 is a crack velocity versus distance graph of the present invention.
Detailed Description
As shown in fig. 1 and 2, the pressurizing device of the present invention includes a high-pressure gas delivery pipe for delivering high-pressure gas to a metal pipe 1, a first type of air compression device 21, a second type of air compression device 22, and a third type of air compression device 23, wherein the high-pressure gas delivery pipe is communicated with the metal pipe 1 through a primary valve 19, the first type of air compression device 21 is installed on the high-pressure gas delivery pipe, a three-way converter 12 is provided at the end of the high-pressure gas delivery pipe, and the three-way converter 12 is connected with the second type of air compression device 22 and the third type of air compression device 23 respectively. The first type of air compression device 21 comprises a first secondary valve 11, a first switching joint 17 and a first air pipe 18, the first air pipe 18 is connected with the first secondary valve 11 through the first switching joint 17, and the first air pipe 18 is communicated with the high-pressure air conveying pipe through the first secondary valve 11. The second type air compression device 22 comprises a second secondary valve, a second adapter 13 and a second air pipe 14, the second air pipe 14 is connected with the second secondary valve through the second adapter 13, and the second secondary valve is used for communicating the second air pipe 14 with the three-way converter 12. The third type of air compression device 23 comprises a third two-stage valve, a third adapter 15 and a third air delivery pipe 16, the third air delivery pipe 16 is connected with the third two-stage valve through the third adapter 15, and the third two-stage valve is used for communicating the third air delivery pipe 16 with the three-way converter 12.
As shown in fig. 3 to 6, a pipe wall crack propagation speed testing device comprises the above-mentioned pressurizing device, a high-pressure gas transmission metal pipe 1 communicated with the pressurizing device, a plurality of time probe units 2 and a dynamic signal acquisition system 5, wherein a linear energy-gathering cutter 7 is installed on the central pipe wall of the metal pipe 1, the time probe units 2 are wound on the metal pipe 1, each time probe unit 2 and one resistance element 4 are connected in series to form a parallel branch, a voltage-stabilizing power supply 8 supplies power to each parallel branch, each channel of the dynamic signal acquisition system 5 respectively acquires the voltage of the resistance element 4 in each parallel branch, and the output end of the dynamic signal acquisition system 5 is connected with a computer 6.
In the present invention, the air pressure burst test was carried out on an X90 metal tube, and the test metal tube 1 had an outer diameter of 1219mm, a wall thickness of 16.3mm, a length of 10.4m, a yield strength of 670MPa, a Charpy impact energy of 294J and an internal pressure of 12 MPa.
The test procedure was as follows:
the method comprises the following steps: time probe unit 2 selects. The time probe unit 2 selects an enameled copper wire with the diameter of 0.4 mm; the length of the tube is 3.8m, which is approximately equal to the circumference of the outer wall surface of the metal tube 1.
Step two: the time probe unit 2 is provided with positions and intervals. As shown in figure 1, the center of the time probe unit 2 is positioned on a pipe wall generatrix where the initial crack 3 is positioned, and the time probe unit 2 is arranged on the outer wall surface of the metal pipe 1 by 180 degrees around the section of the metal pipe 1 and is vertical to the pipe wall generatrix as shown in figure 3. The crack propagation speed of the metal pipe 1 at the crack initiation and crack arrest positions is low, and in order to accurately capture the change of the crack speed, the arrangement distance of the time probe units 2 at the crack initiation and crack arrest positions is 0.25 m; the arrangement pitch of the time probe units 2 at the rest positions of the metal pipe 1 is 0.5 m.
Step three: and the testing device is installed and connected. The time probe unit 2 installation and connection is performed in the following order:
1) and (5) polishing and derusting. And (3) polishing and derusting the outer wall surface of the metal pipe 1 at the position where the time probe unit 2 is installed by using a grinding machine.
2) And (5) cleaning. The polished wall surface was treated with alcohol and gauze.
3) And (6) mounting. And winding the metal pipe 1 on the time probe unit 2 along the pipe wall installation position, fixing the metal pipe with 502 glue, and covering the time probe unit 2 with epoxy resin adhesive glue to enable the time probe unit to be tightly adhered to the pipe wall. In order to ensure the bonding strength, the width of the epoxy resin bonding glue cover is 1.5m, and the thickness is not less than 3 mm.
4) Time probe unit 2 connection. As shown in fig. 1, the a terminal of each time probe unit 2 is respectively connected with the positive electrode of a regulated power supply 8 (2V) through a resistance element 4 (100 Ω), and the b terminal is connected with the negative electrode of the regulated power supply 8; each channel signal input end of the dynamic signal acquisition system 5 is respectively connected with the anode of each resistance element 4, and the grounding end is connected with the cathode of each resistance element 2; the data output end of the dynamic signal acquisition system 5 is connected with the computer 6, and the pressurizing device is communicated with the metal pipe.
Step four: pressurizing by adopting a first type of air compression device, and when the pressure in the pipe is less than or equal to 2MPa, pausing the pressurization for 15 minutes according to 1MPa as a step value until the pressurization is up to 2 MPa; when the pressure in the pipe is more than 2MPa, the pressure is suspended for 10 minutes according to 0.5MPa as a step value until the pressure is 4 MPa;
step five: pressurizing by adopting a B and a third type air compression device, when the pressure in the pipe is less than or equal to 8MPa, pausing the pressurization for 10 minutes according to 0.5MPa as a step value, and then pressurizing to 8 MPa; when the pressure in the pipe is more than 8MPa, the pressurizing is suspended for 10 minutes according to 0.25MPa as a step value until the pressure reaches the target pressure value of the metal pipe;
step six: and (4) measuring the crack speed. Opening the dynamic signal acquisition system 5 and the computer 6; a detonating linear cumulative cutter 7 for introducing an initial crack 3 on the geometric center of the metal tube 1; under the action of high-pressure gas, the crack linearly expands along the axial direction of the metal pipe 1 from two ends of the initial crack 3, the time probe units 2 on the metal pipe 1 are sequentially cut off, and a fracture signal of each time probe unit 2 is transmitted by a signal cable and is acquired by a dynamic signal acquisition system 5 to present a voltage step signal.
Step seven: and obtaining the crack interval speed. Setting the initial crack 3 tip position L 00, initial crack 3 position time t at which the probe unit 2 forms a voltage step signal0Is 0; the remaining time probe units 2 are marked L in order from the initial crack 31、L2、L3……LnThe time of the voltage step signal formed on the corresponding computer 6 is sequentially marked as t1、t2、t3…，ti，…tnWherein L isiDenotes the distance, t, from the ith time probe unit 2 to the tip of the initial crack 3iRepresents the time for the crack to propagate to the ith time probe unit 2; the average velocity V of the crack through the adjacent time probe unit 2i=(Li-Li-1)∕(ti-ti-1) Wherein i =1, 2, 3 … … n; then by a displacement [ (L)i-Li-1)∕2+ Li]Is the X axis and the speed ViAnd drawing a distance-speed curve for the Y axis to obtain the corresponding crack propagation interval speed when the crack propagates to the corresponding position, as shown in fig. 8.
The implementation effect is as follows: as shown in fig. 7, before the time probe unit 2 breaks, the output voltage at two ends of the corresponding resistance element 4 is 1.8V; when the time probe unit 2 is cut off by the crack, the output voltage at the two ends of the corresponding resistance element 4 changes and rapidly drops from 1.8V to 0.15V, a step signal is presented in the computer 6, and the time difference formed by the two step signals is the time when the crack passes through the two corresponding time probe units 2.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (1)
1. A test method of a pipe wall crack propagation speed test device comprises a pressurizing device, a high-pressure gas transmission metal pipe communicated with the pressurizing device, a plurality of time probe units and a dynamic signal acquisition system, wherein the pressurizing device comprises a high-pressure gas transmission pipe for transmitting high-pressure gas to the metal pipe, a first type of air compression device, a second type of air compression device and a third type of air compression device, the high-pressure gas transmission pipe is communicated with the metal pipe through a first-stage valve, the first type of air compression device is arranged on the high-pressure gas transmission pipe, the tail end of the high-pressure gas transmission pipe is provided with a three-way converter, the three-way converter is respectively connected with the second type of air compression device and the third type of air compression device, a linear energy-gathering cutter is arranged on the central pipe wall of the metal pipe, the time probe units are wound on the metal pipe, and each time probe unit and a resistance element are connected in series to form, the voltage-stabilizing power supply supplies power to each parallel branch, each channel of the dynamic signal acquisition system acquires the voltage of a resistance element in each parallel branch respectively, the output end of the dynamic signal acquisition system is connected with a computer, the time probe unit is an enameled copper wire with the diameter of 0.2-0.8 mm and the length of the enameled copper wire of the perimeter of the outer wall surface of the metal tube, the arrangement interval of the time probe unit on the tube wall is 0.25-1.0 m, the center of the time probe unit is positioned on a tube wall bus where an initial crack is positioned, and the time probe unit is arranged on the outer wall surface of the metal tube by 180 degrees around the section of the metal tube and is perpendicular to the tube wall bus, and the dynamic signal: the method comprises the following steps:
(1) polishing and derusting the outer wall surface of the metal pipe at the position where the time probe unit is installed by using a polisher, installing a linear energy gathering cutter on the center of the metal pipe and parallel to a bus of the metal pipe, winding the time probe unit around the metal pipe along the installation position of the pipe wall, fixing the time probe unit by using 502 glue, covering the time probe unit by using epoxy resin adhesive glue to enable the time probe unit to be tightly adhered to the pipe wall, and communicating a pressurizing device with the metal pipe;
(2) one end of each time probe unit is connected with the anode of a stabilized voltage power supply through a resistance element, and the other end of each time probe unit is connected with the cathode of the stabilized voltage power supply; the signal input end of each channel of the dynamic signal acquisition system is respectively connected with the anode of each resistance element, and the grounding end is connected with the cathode of each resistance element; the data output end of the dynamic signal acquisition system is connected with the computer;
(3) pressurizing by adopting a first type of air compression device, when the pressure in the pipe is less than or equal to 2MPa, pausing for 15 minutes according to 1MPa as a step value, and pressurizing to 2MPa again; when the pressure in the pipe is more than 2MPa, the pressure is suspended for 10 minutes according to 0.5MPa as a step value until the pressure is 4 MPa;
(4) pressurizing by adopting a second type air compression device and a third type air compression device, when the pressure in the pipe is less than or equal to 8MPa, pausing the pressurization for 10 minutes according to 0.5MPa as a step value, and then pressurizing to 8 MPa; when the pressure in the pipe is more than 8MPa, the pressurizing is suspended for 10 minutes according to 0.25MPa as a step value until the pressure reaches the target pressure value of the metal pipe;
(5) setting the initial crack tip position L00, time t at which the initial crack position time probe unit forms a voltage step signal0Is 0; the remaining time probe units are marked L in turn from the initial crack1、L2、L3…，Li，…LnThe time of forming the voltage step signal on the corresponding computer is sequentially recorded as t1、t2、t3…，ti，…tnWherein L isiDenotes the distance, t, from the ith time probe unit to the initial fracture tipiRepresents the time for the crack to propagate to the ith time probe unit; crack passing phaseAverage velocity V of adjacent time probe uniti=(Li-Li-1)∕(ti- ti-1) Wherein i =1, 2, 3 … … n; then by a displacement [ (L)i-Li-1)∕2+ Li]Is the X axis and the speed ViAnd drawing a distance-speed curve for the Y axis, so as to obtain the corresponding crack propagation interval speed when the crack propagates to the corresponding position.
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| CN105510157A (en) * | 2015-12-30 | 2016-04-20 | 中国石油天然气集团公司 | Measuring device for fracture speed of whole-size gas bursting test of gas conveying steel pipe |
| CN108469383B (en) * | 2018-04-12 | 2020-09-11 | 瑞瑶环境科技有限公司 | Plastic inspection well quality detection device |
| CN109724882A (en) * | 2018-11-15 | 2019-05-07 | 中国石油天然气集团有限公司 | The experimental rig and method of the minimum section of shear needed for determining gas transmission pipe crack arrest |
| CN113190789B (en) * | 2021-04-29 | 2024-04-09 | 中国石油天然气集团有限公司 | Gas pipeline crack propagation speed calculation method |
| CN115046872B (en) * | 2022-08-09 | 2022-11-15 | 南通泰胜蓝岛海洋工程有限公司 | Fatigue crack real-time measuring method |
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- 2015-11-23 CN CN201510818432.8A patent/CN105352806B/en not_active Expired - Fee Related
- 2015-11-23 CN CN201810442083.8A patent/CN108871963B/en not_active Expired - Fee Related
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| JPH09236528A (en) * | 1996-02-29 | 1997-09-09 | Shimadzu Corp | Internal pressure tester |
| CN201749062U (en) * | 2010-08-25 | 2011-02-16 | 安徽理工大学 | Test device of rock fracture rupture process under action of high confined water |
| CN202548012U (en) * | 2012-05-09 | 2012-11-21 | 张小亮 | Pipeline equivalent internal pressure cracking test clamping device |
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| CN203455225U (en) * | 2013-09-13 | 2014-02-26 | 中国石油天然气股份有限公司 | Rapid tubular product crack propagation test specimen installer |
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| CN103776703A (en) * | 2014-01-24 | 2014-05-07 | 山东大学 | Hydro-fracturing water injection loading device based on rock-like resin sample and test method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105352806A (en) | 2016-02-24 |
| CN108871963A (en) | 2018-11-23 |
| CN105352806B (en) | 2018-09-14 |
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