AU2020102842A4 - A Device and Method for Measuring the Load-point Displacement in Rock Fracture Toughness Test - Google Patents
A Device and Method for Measuring the Load-point Displacement in Rock Fracture Toughness Test Download PDFInfo
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- AU2020102842A4 AU2020102842A4 AU2020102842A AU2020102842A AU2020102842A4 AU 2020102842 A4 AU2020102842 A4 AU 2020102842A4 AU 2020102842 A AU2020102842 A AU 2020102842A AU 2020102842 A AU2020102842 A AU 2020102842A AU 2020102842 A4 AU2020102842 A4 AU 2020102842A4
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- metal block
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the field of rock fracture toughness testing, in particular to a device
and method for measuring the load-point displacement in rock fracture toughness test. The
measuring device comprises the yoke support, two displacement sensors and the clamp; The
clamp comprises the base, the first and second metal blocks arranged on the base; One of the
displacement sensors is located between the first metal block and the third metal block arranged
on the yoke support, and the other displacement sensor is located between the second metal
block and the fourth metal block arranged on the yoke support. The device is simple in
structure, applicable, easy to be machined, adjusted and installed, and has good stability in the
testing process. It is beneficial to eliminate the influence of structure deformation of the three
point bending test clamp on the measuring result of the load-point displacement, which
improves the measuring precision of the load-point displacement.
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Figure I
Description
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Figure I
A Device and Method for Measuring the Load-point Displacement in Rock Fracture Toughness Test
[0001] The invention relates to the field of rock fracture toughness testing, in particular to a device and method for measuring the load-point displacement in rock fracture toughness test.
[0002] The rock fracture toughness is the most important parameter and index of rocks, which indicates the ability of rock material to resist crack propagation or the resistance needed to be overcome to produce new crack surface. At present, V-shaped notch 3 point bending beam specimen (CB) is one of the test methods of rock fracture toughness recommended by the International Society of Rock Mechanics (ISRM).
[0003] When the recommended method is used to test the rock fracture toughness of V-shaped notch rock sample, the rock sample is subjected to at least 4 cycles of loading unloading. The load-point displacement is continuously measured with the extensometer in the loading-unloading process to obtain the load - load-point displacement curve, providing evidence for the nonlinear modification of the fracture toughness value in the test. During the test of the load-point displacement, the yoke support is embedded in the V-shaped notch of the rock sample and fixed, in which the two sides of the yoke support are respectively arranged with the third metal block and the fourth metal block. The rock sample is adjusted so that the upper surface of the third metal block and the fourth metal block is of the same horizontal plane; The end plate of the 3-point bending testing clamp is arranged above the rock sample, and is positioned through the screw with the rock sample, namely the screw is connected with both ends of the rock sample through the end plate; The end plate is arranged with two pen-type extensometers, and the lower end of one of the extensometers contacts the upper surface of the third metal block, while the lower end of the other extensometer contacts the upper surface of the fourth metal block; The rock sample is subjected to loading above the rock sample many times, and the rock sample would deform each time it is loaded. The two pen-type extensometers measure the displacement variance of the load-point to obtain the load-point displacement.
[0004] However, when the end plate is positioned by the screw with the rock sample and the load is applied to the rock sample many times, the rock sample will be deformed. Since the end plate and rock sample are positioned only by contact between the screw and the two ends of the rock sample, but not fixed, the relative position of the end plate and rock sample will move when the rock sample is deformed many times, which leads to the unstable position of the pen-type extensometer set on the end plate, thus reducing the measuring precision of the load-point displacement.
[0005] The purpose of the invention is to provide a device and method for measuring the load-point displacement in rock fracture toughness test to solve the above problems.
[0006] In order to achieve the above object, the technical scheme of the present invention is realized as follows:
[0007] A device for measuring the load-point displacement in rock fracture toughness test includes the yoke support, two displacement sensors and clamps; The clamp comprises the base, the first metal block and the second metal block arranged on the base; The yoke support is provided with the third metal block and the fourth metal block; One of the displacement sensors is located between the first metal block and the third metal block, and the other displacement sensor is located between the second metal block and the fourth metal block.
[0008] Compared with the prior art, the embodiment of the present invention has the advantages that: the measuring device comprises the yoke support, two displacement sensors and the clamp. One of the displacement sensors is located between the first metal block and the third metal block arranged on the yoke support, and the other displacement sensor is located between the second metal block and the fourth metal block arranged on the yoke support. When loading the rock sample, the displacement sensor between the first metal block and the third metal block and the sensor between the second metal block and the fourth metal block will not change its position due to the deformation of the rock sample, which is conducive to eliminating the influence of the structural deformation of 3-point bending test clamp to the measurement results of the load-point displacement, thus improving the detection accuracy of the load-point displacement.
[0009] Figure 1 shows the structural diagram of the load-point displacement measuring device for rock fracture toughness testing provided by the embodiment of the present invention;
[0010] Figure 2 shows the structural diagram of the clamp provided for the embodiment of the invention;
[0011] Figure 3 shows the structural diagram of the yoke support provided for the embodiment of the invention;
[0012] Figure 4 shows the test method step diagram provided for the embodiment of the invention.
[0013] The following further detailed description of the present invention is given by means of the concrete embodiment combined with the appended figures.
[0014] As shown in Figure 1, this embodiment provides a device for measuring the load-point displacement in rock fracture toughness test, which comprises the yoke support 106, two displacement sensors 110 and the clamp 109; As shown in Figures 2 and 3, the clamp 109 includes the base 601, the first metal block 108 and the second metal block 605 arranged on the base 601; The yoke support 106 is provided with the third metal block 107 and the fourth metal block 701; One displacement sensor 110 is located between the first metal block 108 and the third metal block 107 arranged on the yoke support 106, and the other displacement sensor is arranged between the second metal block 605 and the fourth metal block 701 arranged on the yoke support 106.
[0015] In particular, when the testing device is used, the yoke support 106 is embedded in the V-shaped notch of the rock sample and fixed. The rock sample is adjusted so that the upper surface of the third metal block 107 and the fourth metal block 701 is on the same horizontal plane; The clamp 109 is placed below the rock sample, so that the first metal block 108 is below the third metal block 107 and the second metal block 605 is below the fourth metal block 701; and one displacement sensor 110 is placed between the first metal block 108 and the third metal block 107 arranged on the yoke support 106, and the other displacement sensor is placed between the second metal block 605 and the fourth metal block 701 arranged on the yoke support 106; The rock sample is subjected to loading above the rock sample many times, and the rock sample would deform each time it is loaded. The two pen-type extensometers measure the displacement variance of the load-point to obtain the load-point displacement. And during the test procedure, the displacement sensors will not change its position due to the deformation of the rock sample, which is conducive to eliminating the influence of the structural deformation of 3-point bending test clamp to the measurement results of the load-point displacement, thus improving the detection accuracy.
[0016] Preferably, the base 109 comprises the bottom plate 601 and the first plate 607 and the second plate 602 which are vertically connected with the bottom plate 601; The first plate 607 is parallel to the second plate 602; The first metal block 108 is arranged on the first plate 607; The second metal block 605 is arranged on the second plate 602. Namely, the first plate, the second plate and the bottom plate form the U shaped structure.
[0017] Further, the detecting device also comprises the first angle iron 501 and the second angle iron 604; One side of the first angle iron 501 is connected with the first metal block 108, while the other side is connected with the first plate 607; And one side of the second angle iron 604 is connected with the second metal block 605, while the other side is connected with the second plate 602. Certainly, the first metal block 108 and the first plate 607 can also be connected by other means and, correspondingly, the second metal block 605 and the second plate 602 can also be connected by other means.
[0018] For the purpose of adjusting the position of the first angle iron 501 on the first plate 607 and the second angle iron 604 on the second plate 602, the first plate 607 is provided with the first kidney slot 606; and the second plate 602 is provided with the second kidney slot 603; The first plate 607 is connected with the first angle iron 501 with bolts through the first kidney slot 606; and the second plate 602 is connected with the second angle iron 604 with bolts through the second kidney slot 603.
[0019] Preferably, the center line of the first kidney slot 606 and the second kidney slot 603 are both perpendicular to the bottom plate. Namely the first kidney slot 606 and the second kidney slot 603 are vertically arranged when the clamp 109 is placed on the horizontal platform.
[0020] Preferably, the displacement sensor is the extensometer. Specifically, the extensometer may be the pen-type extensometer. Certainly, the extensometer can also be the clamped extensometer. In addition, the sensor may be other devices; and the extensometer may also be other types of extensometer.
[0021] In addition, this embodiment provides a method for measuring the load point displacement using the above testing device, as shown in Figure 4, which includes the following steps:
[0022] 201, the yoke support is embedded in the V-shaped notch of the rock sample and the upper surface of the third and fourth metal blocks of the yoke support is in the same horizontal plane;
[0023] 202, the clamp is placed below the rock sample and the first metal block is placed below the third metal block and the second metal block is located below the fourth metal block;
[0024] 203, one displacement sensor is placed between the first metal block and the third metal block, and the other displacement sensor is placed between the second metal block and the fourth metal block;
[0025] 204, load pressure on rock samples.
[0026] Preferably, the loading device is used to load pressure on the rock sample. Specifically, as shown in Figure 1, the loading device comprises the platform 101, the support rack 102 arranged on the platform and the loading shaft 105. In carrying out the load-point displacement detection, the rock sample 103 is placed on the support rack so that the loading shaft 105 loads pressure on the rock sample 103, wherein the loading position is located at the V-shaped notch 104 of the rock sample 103. The clamp 109 is placed on the platform 101 so that one displacement sensor is positioned between the first metal block and the second metal block 107 arranged on the yoke support, and the other displacement sensor is located between the second metal block and the fourth metal block 701 arranged on the yoke support. The position of the sensors has good stability.
[0027] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms, in keeping with the broad principles and the spirit of the invention described herein.
[0028] The present invention and the described embodiments specifically include the best method known to the applicant of performing the invention. The present invention and the described preferred embodiments specifically include at least one feature that is industrially applicable
Claims (10)
1. A device for measuring the load-point displacement in rock fracture toughness test, which is characterized in that it includes the yoke support, two displacement sensors and the clamp.
The clamp comprises the base, the first and second metal blocks arranged on the base, and the yoke support is arranged with the third and the fourth metal blocks;
One of the displacement sensors is located between the first metal block and the third metal block, and the other displacement sensor is located between the second metal block and the fourth metal block.
2. The testing device, as described in Claim 1, is characterized in that the base comprises the bottom plate and the first and second plates which are vertically connected with the bottom plate;
The first plate is parallel to the second plate; The first metal block is arranged on the first plate; and the second metal block is arranged on the second plate.
3. The testing device, as described in Claim 2, is characterized in that it also includes the first angle iron and the second angle iron;
One side of the first angle iron is connected with the first metal block and the other side is connected with the first plate; and one side of the second angle iron is connected with the second metal block, and the other side is connected with the second plate.
4. The testing device, as described in Claim 3, is characterized in that the first plate is provided with the first kidney slot; The second plate is provided with the second kidney slot;
The first plate is connected with the first angle iron with the bolt through the first kidney slot; The second plate is connected with the second angle iron with the bolt through the second kidney slot.
5. The testing device, as described in Claim 4, is characterized in that the center line of the first kidney slot and the second kidney slot are both perpendicular to the bottom plate.
6. The testing device, as described in any of Claims 1-5, is characterized in that the displacement sensor is the extensometer.
7. The testing device, as described in Claim 6, is characterized in that the extensometer is the pen-type extensometer.
8. The testing device, as described in Claim 6, is characterized in that the extensometer is the clamped extensometer.
9. A method for measuring the load-point displacement of the testing device, as described in any of Claims 1-8, is characterized in that it includes the following steps:
The yoke support is embedded in the V-shaped notch of the rock sample and the upper surface of the third and fourth metal blocks of the yoke support is in the same horizontal plane.
The clamp is placed below the rock sample, the first metal block is placed below the third metal block and the second metal block is placed below the fourth metal block.
One of the displacement sensors is placed between the first metal block and the third metal block, and the other displacement sensor is placed between the second metal block and the fourth metal block; Loading pressure on rock samples.
10. The testing method, as described in Claim 9, is characterized by the use of the loading device to load pressure on the rock sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020102842A AU2020102842A4 (en) | 2020-10-19 | 2020-10-19 | A Device and Method for Measuring the Load-point Displacement in Rock Fracture Toughness Test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020102842A AU2020102842A4 (en) | 2020-10-19 | 2020-10-19 | A Device and Method for Measuring the Load-point Displacement in Rock Fracture Toughness Test |
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| Publication Number | Publication Date |
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| AU2020102842A4 true AU2020102842A4 (en) | 2020-12-17 |
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| AU2020102842A Ceased AU2020102842A4 (en) | 2020-10-19 | 2020-10-19 | A Device and Method for Measuring the Load-point Displacement in Rock Fracture Toughness Test |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798443A (en) * | 2020-12-30 | 2021-05-14 | 河北工业大学 | Rock uniaxial tension-compression test device capable of realizing continuous tension-compression force conversion |
| CN113405918A (en) * | 2021-06-09 | 2021-09-17 | 重庆交通大学 | Device for automatically determining fracture toughness of soil body and using method thereof |
| CN113686663A (en) * | 2021-09-08 | 2021-11-23 | 武汉科技大学 | Splitting clamp device for Brazilian splitting test and using method thereof |
-
2020
- 2020-10-19 AU AU2020102842A patent/AU2020102842A4/en not_active Ceased
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798443A (en) * | 2020-12-30 | 2021-05-14 | 河北工业大学 | Rock uniaxial tension-compression test device capable of realizing continuous tension-compression force conversion |
| CN112798443B (en) * | 2020-12-30 | 2023-06-09 | 河北工业大学 | Rock single-shaft tension-compression test device capable of realizing tension-compression continuous transformation |
| CN113405918A (en) * | 2021-06-09 | 2021-09-17 | 重庆交通大学 | Device for automatically determining fracture toughness of soil body and using method thereof |
| CN113405918B (en) * | 2021-06-09 | 2024-01-26 | 重庆交通大学 | Device for automatically determining soil body fracture toughness and application method thereof |
| CN113686663A (en) * | 2021-09-08 | 2021-11-23 | 武汉科技大学 | Splitting clamp device for Brazilian splitting test and using method thereof |
| CN113686663B (en) * | 2021-09-08 | 2024-05-14 | 武汉科技大学 | Splitting fixture device for Brazilian splitting test and use method thereof |
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| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |