CN111122266B - Device for generating specific local geometric initial defects on outer surface of pipeline - Google Patents
Device for generating specific local geometric initial defects on outer surface of pipeline Download PDFInfo
- Publication number
- CN111122266B CN111122266B CN201911314396.6A CN201911314396A CN111122266B CN 111122266 B CN111122266 B CN 111122266B CN 201911314396 A CN201911314396 A CN 201911314396A CN 111122266 B CN111122266 B CN 111122266B
- Authority
- CN
- China
- Prior art keywords
- frame
- vertical fixing
- pipeline
- fixing frame
- horizontal
- 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.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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 discloses a device for generating specific local geometric initial defects on the outer surface of a pipeline, which is fixed on the top and the side of a bottom beam of a universal testing machine by electromagnetic chuck adsorption and is convenient to disassemble; the external load loads the pipeline test sample piece fixed on the universal testing machine through a side pressure system, so that local geometric initial defects are generated on the surface of the pipeline test sample piece. The lifting of the adjusting connecting rod on the vertical guide rail of the fixed connecting rod can control the position of the generation of the geometric initial defect on the outer surface of the pipeline, and the rotation of the adjusting connecting rod can control the inclination angle of the local geometric initial defect on the outer surface of the pipeline. The horizontal position is adjusted at will through the telescopic link, and the horizontal adjusting rack and the side pressure system are accurately positioned by matching with the scales on the vertical fixing rack; the depth and the size of the local initial geometric defect are completely determined by the external load, and the weight of the external load can be adjusted at will; the influence of the local geometric initial defects on the bearing capacity of the structure is quantitatively researched through experiments, and the method has a wide application prospect.
Description
Technical Field
The invention relates to the technical field of submarine pipeline engineering, in particular to a device and a method for forming specific local geometric initial defects on the outer surface of a pipeline by using external loads.
Background
The submarine pipeline inevitably generates some initial defects in the processes of production, processing, manufacturing and installation, and the local geometric initial defects of the pipeline are important defect forms, especially for thin-wall pipelines with large diameter-thickness ratio, the local geometric initial defects greatly reduce the strength and stability of the pipeline, so that the mechanical property and the failure mode of the pipeline have important influence. Therefore, in the field of subsea pipeline engineering, and in particular in design calculation and evaluation of subsea pipelines, local geometric initial defects are issues that must be considered and addressed in pipeline design engineering.
In order to study The effect of local geometric initial defects on The strength and stability of a submarine pipeline in experimental studies, it is often necessary to first make local geometric initial defects on The surface of The submarine pipeline, and The local geometric initial defects are generated by using a spherical or hemispherical indenter, one end of which is in contact with The outer surface of The submarine pipeline, The other end of which is connected to one end of a press, and The press is used for pressing, so that The local geometric initial defects are generated on The outer surface of The submarine pipeline (Ong L S, Soh A K, Ong J H. Experimental and final element information of a local dent on a pressed pipe [ J ]. The Journal of a pipeline Analysis for Engineering Den, 1992,27(3): 177-. This method has problems in that a local geometric initial defect of a predetermined tilt angle cannot be generated at a predetermined position as required and the adaptability is poor. Therefore, it is necessary to design a device capable of generating local geometric initial defects of a predetermined inclination angle at a predetermined position of a submarine pipeline test sample, and the device is simple in structure, reliable, low in cost, and suitable for generating local geometric initial defects of pipelines with various geometric dimensions, so as to meet the requirements of submarine pipeline stability and strength test, and the requirements of relevant theory and finite element model verification.
Disclosure of Invention
In order to avoid the disadvantages of the prior art, the invention provides a device for generating specific local geometric initial defects on the outer surface of a pipeline; the device passes through electromagnetic chuck and adsorbs in universal tester top and bottom crossbeam side, and its easy dismounting, horizontal position is adjusted wantonly to the accessible telescopic link, and the pressure head position can all-round accurate regulation, uses in a flexible way, is applicable to the pipeline surface specific position of different diameters and produces specific local initial geometric defect, and application scope is wide.
The invention solves the technical problem by adopting the technical scheme that the device comprises an electromagnetic chuck, a telescopic rod, a vertical fixing frame, a horizontal adjusting frame, a connecting rod, an adjusting knob, a sliding block, a side pressure rod, a pressure head, a side pressure plate, a steel wire rope, a pulley shaft and an external load, and is characterized in that the vertical fixing frame is of a hollow rectangular frame structure, a long strip-shaped through groove is formed in the side wall of the vertical fixing frame, scales are marked on one side of the adjusting knob arranged on the side wall of the vertical fixing frame, the vertical fixing frame is fixedly connected with the side surfaces of a top cross beam and a bottom cross beam of a universal testing machine through a plurality of telescopic rods and the electromagnetic chuck in an adsorption manner, one; the horizontal adjusting frame is positioned in a long slotted hole in the middle part of the vertical fixing frame and is matched and connected with the adjusting knob through a connecting rod, a trapezoidal groove is formed in the lower part of the horizontal adjusting frame and serves as a guide rail of the sliding block, the sliding block is positioned at the bottom of the horizontal adjusting frame and is fixed on the side pressure rod, the sliding block is matched and slides with the groove guide rail on the horizontal adjusting frame, one end of the side pressure rod is connected with the pressure head, the other end of the side pressure rod is fixedly connected with the side pressure plate, the pulley is connected with a lug at the end part of the horizontal adjusting frame through a pulley shaft, one end of a steel;
the middle of the horizontal adjusting frame is provided with a circular through hole, and the horizontal adjusting frame is matched with the horizontal adjusting frame through a connecting rod and an adjusting knob to adjust the inclination angle of the horizontal adjusting frame and the side pressure rod in the horizontal direction, so that the inclination angle of local geometric initial defects generated on the outer surface of the pipeline is controlled; the side wall of the vertical fixing frame is provided with an adjusting knob, and the vertical positions of the horizontal adjusting frame, the side pressure rod and the pressure head are adjusted through the adjusting knob;
the method for generating the specific local geometric initial defect on the outer surface of the pipeline comprises the following steps:
(a) fixing two ends of a test sample piece respectively through clamps of a top cross beam and a bottom cross beam of the universal testing machine;
(b) the vertical fixing frame is fixed on the side surfaces of the top cross beam and the bottom cross beam of the universal testing machine through electromagnetic chucks;
(c) rotating an adjusting knob, generating an inclination angle and a position of a local geometric initial defect as required, adjusting the inclination angle and the position of a horizontal adjusting frame by using a protractor and combining scales on a vertical fixing frame so as to adjust the inclination angle and the position of a pressure head, and then rotating and fixing the adjusting knob;
(d) calculating the external load to be applied according to the depth of the initial defect on the test sample piece;
(e) and selecting a proper weight for loading according to the magnitude of the external load required to be applied, so that the required local initial geometric defect can be generated on the test sample.
The telescopic rods are symmetrically arranged, the telescopic length can be adjusted along the horizontal direction, and the horizontal adjusting frame and the side pressure rods are positioned by matching with scales on the vertical fixing frame; thereby adjusting the horizontal position of the vertical fixing frame.
Advantageous effects
The invention provides a device for generating specific local geometric initial defects on the outer surface of a pipeline; the electromagnetic chuck is fixed on the top of the universal testing machine and the side surface of the bottom beam in an adsorption manner, so that the universal testing machine is convenient to disassemble; the external load loads the pipeline test sample piece fixed on the universal testing machine through a side pressure system, so that local geometric initial defects are generated on the surface of the pipeline test sample piece. The position of the pipeline outer surface geometric initial defect can be controlled by adjusting the lifting of the connecting rod on the vertical guide rail of the fixed connecting rod, and the inclination angle of the local geometric initial defect on the pipeline outer surface can be controlled by adjusting the rotation of the connecting rod. The horizontal position can be adjusted at will through the telescopic link, and the device is suitable for test sample pieces with different pipe diameters; the side surface of the vertical fixing frame is provided with a strip-shaped through groove which can be used as a guide rail so as to adjust the vertical positions of the horizontal adjusting frame, the side pressure rod, the side pressure plate and the pressure head, and the horizontal adjusting frame and the side pressure system are accurately positioned by matching with the scales on the vertical fixing frame; the depth and the size of the local initial geometric defect are completely determined by the external load, and the weight of the external load can be adjusted at will;
the method is suitable for generating the local geometric initial defect of the preset inclination angle at the preset position of the outer surface of the pipeline with different diameters, can quantitatively research the influence of the local geometric initial defect on the bearing capacity of the structure through tests, and has the advantages of wide application range, convenience in disassembly and assembly and reusability; the problems that the traditional method cannot generate a local geometric initial defect of a preset inclination angle at a preset position, and has poor adaptability and inconvenient disassembly and assembly are solved.
Drawings
An apparatus for creating initial defects of a particular local geometry in the outer surface of a pipe according to the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
FIG. 1 is a schematic view of an apparatus for creating initial defects of a specific local geometry on the outer surface of a pipe according to the present invention.
FIG. 2 is a schematic view of the connection structure of the electromagnetic chuck, the telescopic rod and the vertical fixing frame of the present invention.
Fig. 3 is a schematic view of the horizontal adjusting bracket of the present invention.
FIG. 4 is a schematic diagram of the side pressure system of the present invention.
FIG. 5 is a front view of the apparatus of the present invention for creating a specific localized geometric initial defect in the outer surface of a pipe.
In the drawings
1. Electromagnetic chuck 2, telescopic rod 3, vertical fixing frame 4, horizontal adjusting frame 5, connecting rod 6, adjusting knob 7, sliding block 8, side pressing rod 9, pressing head 10, side pressing plate 11, steel wire rope 12, pulley 13, pulley shaft 14, external load 15, test sample piece 16, top cross beam 17, bottom cross beam 18, strip-shaped through groove 19, trapezoid groove 20, side plate 21, through hole 22 and steel wire rope hole
Detailed Description
This embodiment is an apparatus for creating specific localized geometric initial defects in the outer surface of a pipe.
Referring to fig. 1 to 5, the device for generating the initial defect of the specific local geometry on the outer surface of the pipeline in the embodiment comprises an electromagnetic chuck 1, telescopic rods 2, a vertical fixing frame 3, a horizontal adjusting frame 4, a connecting rod 5, an adjusting knob 6, a sliding block 7, a lateral pressure rod 8, a pressure head 9, a lateral pressure plate 10, a steel wire rope 11, a pulley 12, a pulley shaft 13 and an external load 14, wherein the vertical fixing frame 3 is of a hollow rectangular frame structure, a strip-shaped through groove 18 is formed in the side wall of the vertical fixing frame 3, scales are marked on one side of the vertical fixing frame 3 on which the adjusting knob 6 is installed, and the vertical fixing frame 3 is fixed on the side surfaces of a top cross beam and a bottom cross beam of the universal testing machine. One end of the telescopic rod 2 is fixedly connected with the vertical fixing frame 3, and the other end of the telescopic rod 2 is connected with the electromagnetic chuck 1. The horizontal adjusting frame 4 is arranged in a long slotted hole in the middle of the vertical fixing frame 3 and is in matched connection with the adjusting knob 6 through a connecting rod 5; the lower part of the horizontal adjusting frame is provided with a trapezoidal groove as a guide rail of a sliding block 7, the sliding block 7 is positioned at the bottom of the horizontal adjusting frame 4 and fixed on a side pressure rod 8, and the sliding block is matched with the groove guide rail on the horizontal adjusting frame 4 to slide. One end of a side pressure rod 8 is connected with a pressure head 9, the other end of the side pressure rod 8 is fixedly connected with a side pressure plate 10, a pulley 12 is connected with a lug at the end part of the horizontal adjusting frame 4 through a pulley shaft 13, one end of a steel wire rope 11 is connected with a steel wire rope hole 22 on the side pressure plate 10, and the other end of the steel wire rope is fixedly connected with an external load 14 by bypassing the pulley 12.
In this embodiment, the middle of the horizontal adjusting frame 4 is provided with a circular through hole, and the horizontal adjusting frame 4 is matched with the connecting rod 5 and the adjusting knob 6 to adjust the horizontal inclination angles of the horizontal adjusting frame and the side pressure rods, so as to control the inclination angle of the local geometric initial defect generated on the outer surface of the pipeline. The scale is marked on one side of an adjusting knob 6 arranged on the side wall of the vertical fixing frame 3, and the vertical positions of the horizontal adjusting frame, the side pressure rod and the pressure head are adjusted through the adjusting knob, so that local initial geometric defects are generated at the specific position of the test sample piece. The telescopic rods are symmetrically arranged, the telescopic length can be adjusted along the horizontal direction, and the horizontal adjusting frame and the side pressure rods are positioned by matching with scales on the vertical fixing frame; thereby adjusting the horizontal position of the vertical fixing frame.
In this embodiment, the method for generating the specific local geometric initial defect on the outer surface of the pipe comprises the following steps:
(a) fixing two ends of a test sample piece 15 by clamps of a top cross beam 16 and a bottom cross beam 17 of a universal testing machine respectively;
(b) the vertical fixing frame 3 is fixed on the side surfaces of a top cross beam 16 and a bottom cross beam 17 of the universal testing machine through the electromagnetic chuck 1;
(c) rotating an adjusting knob 6, generating an inclination angle and a position of a local geometric initial defect as required, adjusting the inclination angle and the position of a horizontal adjusting frame 4 by using a protractor and combining scales on a vertical fixing frame 3, thereby adjusting the inclination angle and the position of a pressure head, and then rotating and fixing the adjusting knob 6;
(d) calculating the external load to be applied according to the depth of the initial defect on the test sample piece;
(e) and selecting a proper weight for loading according to the size of the external load required to be applied, so that the required local initial geometric defect can be generated on the test sample.
In this embodiment, according to the experiment needs, select the submarine pipeline test sample piece of a certain pipe diameter, fix its both ends respectively on the anchor clamps of universal tester top crossbeam and bottom crossbeam. The device is calibrated on the side surfaces of the top cross beam and the bottom cross beam of the universal testing machine according to the position, then the whole device is fixed at the preset positions on the side surfaces of the top cross beam and the bottom cross beam of the universal testing machine through electromagnetic chucks, and the telescopic rod is adjusted, so that the distance between the pressure head and the pipeline test sample piece is not too far when the pressure head is in no-load state. Unscrewing an adjusting knob, generating an inclination angle and a position of a local geometric initial defect as required, adjusting the inclination angle and the position of a horizontal adjusting frame by using a protractor and combining scales on a vertical fixing frame so as to adjust the inclination angle and the position of a pressure head, and then rotating and fixing the adjusting knob; and finally, selecting a proper weight for loading, so that the required local geometric initial defect can be generated on the test sample. And unloading, wherein the local geometric initial defects generated after unloading sometimes have certain springback, and the local geometric initial defects can be generated on the test sample by repeating the reloading and the reloading for multiple times.
Claims (2)
1. A device for generating specific local geometric initial defects on the outer surface of a pipeline comprises an electromagnetic chuck, telescopic rods, a vertical fixing frame, a horizontal adjusting frame, a connecting rod, an adjusting knob, a sliding block, a lateral pressure rod, a pressure head, a lateral pressure plate, a steel wire rope, a pulley shaft and an external load, and is characterized in that the vertical fixing frame is of a hollow rectangular frame structure, a long strip-shaped through groove is formed in the side wall of the vertical fixing frame, scales are marked on one side of the vertical fixing frame on which the adjusting knob is installed, the vertical fixing frame is fixedly attached to the side surfaces of a top cross beam and a bottom cross beam of a universal testing machine through a plurality of telescopic rods and the electromagnetic chuck, one end of each telescopic rod is; the horizontal adjusting frame is positioned in a long slotted hole in the middle part of the vertical fixing frame and is matched and connected with the adjusting knob through a connecting rod, a trapezoidal groove is formed in the lower part of the horizontal adjusting frame and serves as a guide rail of the sliding block, the sliding block is positioned at the bottom of the horizontal adjusting frame and is fixed on the side pressure rod, the sliding block is matched and slides with the groove guide rail on the horizontal adjusting frame, one end of the side pressure rod is connected with the pressure head, the other end of the side pressure rod is fixedly connected with the side pressure plate, the pulley is connected with a lug at the end part of the horizontal adjusting frame through a pulley shaft, one end of a steel;
the middle of the horizontal adjusting frame is provided with a circular through hole, and the horizontal adjusting frame is matched with the horizontal adjusting frame through a connecting rod and an adjusting knob to adjust the inclination angle of the horizontal adjusting frame and the side pressure rod in the horizontal direction, so that the inclination angle of local geometric initial defects generated on the outer surface of the pipeline is controlled; the side wall of the vertical fixing frame is provided with an adjusting knob, and the vertical positions of the horizontal adjusting frame, the side pressure rod and the pressure head are adjusted through the adjusting knob;
the method for generating the specific local geometric initial defect on the outer surface of the pipeline comprises the following steps:
(a) fixing two ends of a test sample piece respectively through clamps of a top cross beam and a bottom cross beam of the universal testing machine;
(b) the vertical fixing frame is fixed on the side surfaces of the top cross beam and the bottom cross beam of the universal testing machine through electromagnetic chucks;
(c) rotating an adjusting knob, generating an inclination angle and a position of a local geometric initial defect as required, adjusting the inclination angle and the position of a horizontal adjusting frame by using a protractor and combining scales on a vertical fixing frame so as to adjust the inclination angle and the position of a pressure head, and then rotating and fixing the adjusting knob;
(d) calculating the external load to be applied according to the depth of the initial defect on the test sample piece;
(e) and selecting a proper weight for loading according to the magnitude of the external load required to be applied, so that the required local initial geometric defect can be generated on the test sample.
2. The device for generating the initial defect of the specific local geometry on the outer surface of the pipeline as claimed in claim 1, wherein the telescopic rods are symmetrically arranged, the telescopic length can be adjusted along the horizontal direction, and the horizontal adjusting frame and the side pressure rods are positioned by matching with scales on the vertical fixing frame; thereby adjusting the horizontal position of the vertical fixing frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911314396.6A CN111122266B (en) | 2019-12-19 | 2019-12-19 | Device for generating specific local geometric initial defects on outer surface of pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911314396.6A CN111122266B (en) | 2019-12-19 | 2019-12-19 | Device for generating specific local geometric initial defects on outer surface of pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111122266A CN111122266A (en) | 2020-05-08 |
| CN111122266B true CN111122266B (en) | 2021-06-25 |
Family
ID=70500105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911314396.6A Active CN111122266B (en) | 2019-12-19 | 2019-12-19 | Device for generating specific local geometric initial defects on outer surface of pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111122266B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112113848A (en) * | 2020-09-08 | 2020-12-22 | 天津大学 | Device is applyed to submarine pipeline initial defect |
| CN113049339B (en) * | 2021-04-01 | 2024-01-16 | 西北工业大学 | Device for producing specific local geometric initial defects on the outer surface of a thin-shell structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002054042A1 (en) * | 2001-01-03 | 2002-07-11 | Sela Semiconductor Engineering Laboratories Ltd. | Improved method for preparing semiconductor wafer for defect analysis |
| CN204255713U (en) * | 2014-10-30 | 2015-04-08 | 中国石油天然气股份有限公司 | Pipeline pit defect manufacturing device |
| CN204924777U (en) * | 2015-08-13 | 2015-12-30 | 山东路达试验仪器有限公司 | Automatic impactometer's briquetting release is pressed to ball |
| CN204944916U (en) * | 2015-09-25 | 2016-01-06 | 陕西理工学院 | A kind of impingement crackle sampling machine |
| CN105823659A (en) * | 2016-03-15 | 2016-08-03 | 南昌航空大学 | Manufacturing technology of test block for comparison of micro cracks in thermal barrier coating of engine blade |
| CN205941201U (en) * | 2016-07-12 | 2017-02-08 | 苏州电器科学研究院股份有限公司 | Tensile testing machine of three orientations |
| CN110095328A (en) * | 2019-06-18 | 2019-08-06 | 安徽理工大学 | A kind of device and method for producing different crack positions, inclination angle and connected ratio rock sample |
-
2019
- 2019-12-19 CN CN201911314396.6A patent/CN111122266B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002054042A1 (en) * | 2001-01-03 | 2002-07-11 | Sela Semiconductor Engineering Laboratories Ltd. | Improved method for preparing semiconductor wafer for defect analysis |
| CN204255713U (en) * | 2014-10-30 | 2015-04-08 | 中国石油天然气股份有限公司 | Pipeline pit defect manufacturing device |
| CN204924777U (en) * | 2015-08-13 | 2015-12-30 | 山东路达试验仪器有限公司 | Automatic impactometer's briquetting release is pressed to ball |
| CN204944916U (en) * | 2015-09-25 | 2016-01-06 | 陕西理工学院 | A kind of impingement crackle sampling machine |
| CN105823659A (en) * | 2016-03-15 | 2016-08-03 | 南昌航空大学 | Manufacturing technology of test block for comparison of micro cracks in thermal barrier coating of engine blade |
| CN205941201U (en) * | 2016-07-12 | 2017-02-08 | 苏州电器科学研究院股份有限公司 | Tensile testing machine of three orientations |
| CN110095328A (en) * | 2019-06-18 | 2019-08-06 | 安徽理工大学 | A kind of device and method for producing different crack positions, inclination angle and connected ratio rock sample |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111122266A (en) | 2020-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111122266B (en) | Device for generating specific local geometric initial defects on outer surface of pipeline | |
| CN106153314B (en) | A kind of load of plane framework node and the shear-deformable measuring device in node area | |
| CN105352803A (en) | Multi-angle loading pressure head system for Brazilian split test | |
| EP2613134A2 (en) | System and method for aligning a test article with a load | |
| CN106153458B (en) | Device is used in a kind of calibration of tension and compression type residual stress | |
| CN102539261B (en) | Steel tube bending deformation testing system | |
| CN105203453B (en) | Micro- the punching test device and method of a kind of welding point Micro Zone Mechanical Properties | |
| CN206095777U (en) | Measuring accessories of creep, duration running fracture sample | |
| CN102087186A (en) | Fretting fatigue test platform | |
| CN206515147U (en) | Thin-walled bar tensile test device | |
| CN106918417B (en) | Steel plate membrane stress tests force application apparatus | |
| CN102721342A (en) | Inspection device for inspecting position of hole | |
| CN105806709B (en) | Method and equipment for testing performance of pipe | |
| CN106525590A (en) | Static deformation experiment device for testing low-strength test piece | |
| CN105927617A (en) | General test platform for large hydraulic actuator cylinder of airplane | |
| CN111948077A (en) | High-temperature high-pressure composite fretting wear test device | |
| CN101963562A (en) | New transposition wire rigidity test device | |
| CN209745723U (en) | rebar reverse bending test device | |
| CN204758466U (en) | High temperature water under high pressure or steam environment fine motion abrasion tester | |
| CN207892931U (en) | A kind of experiment loading unit of verification pressurized strut bearing capacity | |
| CN102506804A (en) | Device and method for measuring turning angle of cross section at 2D length position of middle part of tested pipe | |
| KR101463685B1 (en) | An apparatus for examining surface status of metallic and plastic materials | |
| CN206270165U (en) | A kind of rock true triaxial test equipment | |
| CN209215110U (en) | A kind of experimental rig of the uniaxial tensile test suitable for viscoelastic material | |
| CN201828460U (en) | Novel transposed wire rigid test device |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |