CN110987667A - Rock high-temperature shear test device and method suitable for split Hopkinson bar - Google Patents
Rock high-temperature shear test device and method suitable for split Hopkinson bar Download PDFInfo
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- CN110987667A CN110987667A CN201911247828.6A CN201911247828A CN110987667A CN 110987667 A CN110987667 A CN 110987667A CN 201911247828 A CN201911247828 A CN 201911247828A CN 110987667 A CN110987667 A CN 110987667A
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention discloses a rock high-temperature shear test device and method suitable for a split Hopkinson bar, and the device comprises a high-temperature confining pressure loading unit and an SHPB dynamic loading unit, wherein a rigid heat-insulating frame of the high-temperature confining pressure loading unit is inwards sequentially nested with a resistance heating ring, silicon carbide particles wrapped in a flexible compact metal wire mesh cloth and a rock sample; the flexible compact metal wire mesh cloth is connected with the servo press through the connecting pipe, and the silicon carbide particles filled in the flexible compact metal wire mesh cloth can realize rapid temperature conduction and uniform pressure application on a sample; two sides of the disc-shaped rock sample are respectively contacted with an SHPB dynamic loading unit of the device consisting of the solid incident rod and the hollow transmission rod. The invention solves the problem that the prior art can not synchronously apply high temperature and confining pressure while dynamically shearing and loading a sample, and simultaneously provides horizontal constraint force for the sample when confining pressure is applied, thereby avoiding stress wave imbalance caused by sample movement under the action of impact.
Description
Technical Field
The invention belongs to the technical field of high-temperature rock impact shear tests, and particularly relates to a rock high-temperature shear test device and a rock high-temperature shear test method suitable for a split Hopkinson bar.
Background
Many deep rock projects involve high temperatures, such as underground coal gasification, nuclear waste storage, underground fires, hot dry rock development, and the like. Due to the complex deep ground stress environment, along with activities such as human blasting and the like, the rock mass is often influenced by dynamic disturbance, and shear failure under dynamic impact disturbance is a common cause of rock mass instability.
At present, a main device for researching the dynamic properties of rocks is a separated Hopkinson pressure bar, but the traditional separated Hopkinson pressure bar does not have the impact shear test function under the high-temperature condition, so that in order to research the characteristics of a rock mass under the impact shear action in high-temperature rock engineering, a rock high-temperature shear test device and a rock high-temperature shear test method suitable for the separated Hopkinson pressure bar are urgently needed to be developed.
The conventional high-temperature Hopkinson pressure bar devices, such as CN208223987U and CN110296898A, are heated in a heat radiation mode, cannot be heated rapidly due to the limitation of heat radiation efficiency, cannot apply confining pressure to a sample, and cannot apply dynamic shearing force to the sample.
In addition, other disclosed test devices and methods for dynamically shearing rock, such as CN108204918A, CN107796711A, CN110057690A and the like, cannot realize a shear loading mode with a confining pressure state, and cannot reproduce the pressure-shear stress state of a rock body in engineering.
Although patent CN203616199U discloses a flexible pressure chamber capable of achieving uniform confining pressure, it is loaded by introducing gas or liquid between the flexible inner and outer walls, and is not suitable for high temperature heating environment, and it will be disadvantageous to waveform acquisition in SHPB experiment.
In summary, in order to realize the rock shear loading under the high temperature and high pressure state, it is necessary to overcome the above-mentioned defects and develop a new loading device.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, the invention aims to provide a rock high-temperature shear test device and method which are convenient to load, modularized and reliable in performance and are suitable for a split Hopkinson bar.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a rock high temperature shear test device suitable for disconnect-type hopkinson pole which characterized in that: the device comprises a high-temperature confining pressure loading unit and an SHPB dynamic loading unit;
a heating element, silicon carbide particles and a rock sample wrapped in a flexible metal mesh bag are sequentially nested in a rigid heat-insulating frame of the high-temperature confining pressure loading unit from outside to inside, and a servo press machine acting on the silicon carbide particles is arranged on the rigid heat-insulating frame;
and an incident rod and a transmission rod of the SHPB dynamic loading unit are respectively aligned to two opposite ends of the rock sample.
Further, the servo presses are uniformly distributed along the circumferential direction of the rock sample;
the flexible metal mesh bag is connected with the piston rod end of the servo press in a sliding mode through a connecting pipe, and silicon carbide particles are filled in the connecting pipe.
Furthermore, the connecting pipe passes through the opening at the side part of the rigid heat-insulating frame, and the incident rod and the transmission rod pass through the openings at the two ends of the rigid heat-insulating frame.
Furthermore, the rigid heat-insulating frame is fixedly connected with the connecting pipe.
Further, the heating element is a rigid resistance heating coil.
Furthermore, a temperature sensing element is arranged in the resistance heating ring, and the voltage of the resistance heating ring is automatically adjusted by a computer according to the temperature of the temperature sensing element so as to realize constant temperature maintenance.
Further, the particle size of the silicon carbide particles is less than 1 mm;
the diameter of the metal wire of the flexible metal mesh bag is less than 0.5mm and the aperture is less than 0.5 mm.
Furthermore, the transmission rod is of a hollow rod body structure, the outer diameter of the transmission rod is consistent with the diameter of the rock sample, and the inner diameter of the transmission rod is larger than the diameter of the incident rod.
Further, the rock sample is cylindrical.
A rock high-temperature shear test method suitable for a split Hopkinson bar uses the rock high-temperature shear test device and comprises the following steps:
Firstly, a heating element is installed in a rigid heat-preservation frame; secondly, installing a flexible metal mesh bag in the rigid heat-insulation frame, and filling silicon carbide particles in the flexible metal mesh bag; then, a servo press is arranged on the rigid heat-insulation frame, and the piston rod end of the servo press acts on the silicon carbide particles in the flexible metal mesh bag;
Firstly, a sample is arranged in a cavity area surrounded by a flexible metal mesh bag; secondly, adjusting the vertical height of the whole temperature confining pressure loading unit to enable two ends of the sample to be respectively contacted with an incident rod and a transmission rod of the SHPB dynamic loading unit;
and 3, starting the servo press to uniformly coat the silicon carbide particles on the ring surface of the sample, aligning the center of the sample with the centers of the incident rod and the transmission rod by adjusting the pressure of the servo press in each direction, and enabling the incident rod and the hollow transmission rod to contact the sample.
and 6, analyzing the deformation and damage conditions of the sample material by using the measured incident wave, transmitted wave and reflected wave to obtain the dynamic mechanical property data of the sample. The dynamic shear strength of the test specimens was:
in the formula TdDynamic shear strength; p is a radical ofmaxThe maximum dynamic load is obtained by converting strain gauges and elastic modulus on the incident rod (8) and the transmission rod (9); r and R are the inner radius of the transmission rod and the radius of the incident rod respectively; d is the thickness of the sample. The shear strain rate was:
in the formula
Is the shear strain rate; v. ofpIs the longitudinal wave velocity of the rock; epsilonI、εRAnd εTIncident strain, reflection strain and transmission strain are measured by a strain gauge on the incident rod (8) in sequence, and the transmission strain is measured by a strain gauge on the transmission rod (9).
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, solid silicon carbide particles are used as a temperature conducting medium, the silicon carbide particles are wrapped by the flexible metal mesh bag and used as a pressure conducting medium, and the rigid heat-insulating frame wraps and provides a counter-force support to realize synchronous loading of the temperature and the pressure of the rock sample, and meanwhile, the silicon carbide particles have good temperature stability and high heat conductivity, so that quick and accurate temperature and pressure loading below 1300 ℃ can be realized.
2. When the silicon carbide particles are used as a force and temperature conducting medium, a stable force chain network is formed between the particles extruded mutually under the action of a self-locking effect during loading, and the confining pressure and the friction force on the side surface of the sample can be provided, so that the sample cannot move under the action of an incident rod and a transmission rod, and the sample is subjected to complete shearing force.
3. The flexible metal mesh bag is connected with the servo press through the connecting pipe, the internal pressurization of the rigid heat-insulation frame and the external servo control function of pressure are realized, the influence of high temperature on the servo press is avoided, and the control of installation modularization, temperature and pressure is accurate.
4. The solid metal rod is used as an incident rod, the hollow metal rod is used as a transmission rod, and the dynamic shearing function of the rock is realized with the middle disc-shaped rock sample, so that the assembling and disassembling are convenient, and the preparation requirement on the rock sample is low.
Drawings
FIG. 1 is a front view of the device;
FIG. 2 is a front view of the main components of the apparatus in isolation;
fig. 3 is a top view of the device.
Wherein: 1-rigid heat preservation frame, 2-heating element, 3-silicon carbide particle, 4-flexible metal mesh bag, 5-rock sample, 6-connecting pipe, 7-servo press, 8-incident rod and 9-transmission rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, a rock high-temperature shear test device suitable for a split hopkinson bar comprises a high-temperature confining pressure loading unit and an SHPB dynamic loading unit, wherein the high-temperature confining pressure loading unit comprises a rigid heat-insulating frame 1, a heating element 2, silicon carbide particles 3, a flexible metal mesh bag 4, a connecting pipe 6 and a servo press 7, the SHPB dynamic loading unit is a conventional SHPB test system, the rigid heat-insulating frame 1 is inwards nested with the heating element 2, the silicon carbide particles 3 and a rock sample 5 wrapped in the flexible metal mesh bag 4 in sequence, the heating element 2 is used for heating the rock sample, the servo press 7 is arranged on the rigid heat-insulating frame and acts on the silicon carbide particles, so that the confining pressure is uniformly conducted to the rock sample 5 by using the silicon carbide particles as pressure conducting media, an incident rod 8 and a transmission rod 9 of the SHPB dynamic loading unit are respectively aligned with opposite ends of the rock sample 5, thereby applying an impact force to the rock sample.
According to the invention, solid silicon carbide particles are used as a temperature conducting medium, the silicon carbide particles are wrapped by the flexible metal mesh bag and used as a pressure conducting medium, and the rigid heat-insulating frame wraps and provides a counter-force support to realize synchronous loading of the temperature and the pressure of the rock sample, and meanwhile, the silicon carbide particles have good temperature stability and high heat conductivity, so that quick temperature and pressure loading below 1300 ℃ can be realized. The solid metal rod is used as an incident rod, the hollow metal rod is used as a transmission rod, and the dynamic shearing function of the rock is realized with the middle disc-shaped rock sample, so that the assembling and disassembling are convenient, and the preparation requirement on the rock sample is low.
Compared with the traditional methods such as patent CN203616199U and the like, which directly use gas and liquid as pressure conduction media, the silicon carbide particles have the advantages of high temperature resistance, strong pressure resistance and large thermal conductivity, and can meet the requirements of synchronous, rapid and accurate loading of temperature and pressure required by the invention.
In addition, when the silicon carbide particles are used as the conducting medium for force and temperature in the embodiment, the following advantages are also provided: during loading, the particles extruded with each other form a stable force chain network under the action of a self-locking effect, and can provide confining pressure and friction force on the side surface of the sample, so that the sample cannot move under the action of the incident rod and the transmission rod, and the sample is subjected to complete shearing force, therefore, the scheme of the invention cannot cause loss of incident waves, can collect complete transmitted waves and reflected waves, and has high accuracy of measured dynamic mechanical parameters. The traditional scheme adopting gas and liquid as pressure transmission media cannot provide lateral friction force due to the fluidity of the media, and displacement occurs under the action of the incident rod and the transmission rod, so that imbalance of incident waves, transmitted waves and reflected waves is caused.
Referring to fig. 2 and 3, it can be understood that a plurality of servo presses 7 are uniformly distributed along the circumference of the rock sample 5, the flexible metal mesh bag 4 is connected with the piston rod end of the servo press 5 in a sliding manner through a connecting pipe 6, and silicon carbide particles are also filled in the connecting pipe 6.
The piston rod of this embodiment servo press 7 slides in the connecting pipe to extrude connecting pipe silicon carbide granule, with the even dispersion of pressure to the silicon carbide granule in flexible metal mesh bag 7, thereby realize the even loading of the peripheral each department of rock sample, compare pressure direct action at flexible metal mesh bag, pressure distribution is more even, and the transmissibility is better.
Specifically, the rigid heat-insulating frame 1 is made of a rigid heat-insulating material, an inner opening is used for a connecting pipe 6 to pass through, and an outer opening is used for an incident rod 8 and a transmission rod 9 of the SHPB test system to pass through; the incident rod 8 and the transmission rod 9 are not fixed on the rigid heat-preservation frame 1 and can move freely; the transmission rod 9 is of a hollow rod body structure, the outer diameter of the transmission rod is consistent with the diameter of the rock sample 5, and the inner diameter of the transmission rod is larger than the diameter of the incident rod 8, so that the rock sample 5 damaged by impact can be conveniently collected.
In practical applications, the silicon carbide particles 3 are preferably selected to be smaller than 1mm, because the excessive particle size is not favorable for the transmission of pressure, and correspondingly, the pore diameter of the flexible metal mesh bag 4 is preferably selected to be smaller than 0.5mm, and the diameter of the metal wire is generally smaller than 0.5 mm. Of course, silicon carbide particles 3 of other particle sizes and flexible metal mesh bags 4 of different pore sizes may be used.
In some embodiments, the heating element 2 adopts a rigid resistance heating ring, a temperature sensing element is arranged in the resistance heating ring, and the voltage of the resistance heating ring is automatically adjusted by a computer according to the temperature of the temperature sensing element so as to realize constant maintenance of the temperature; the servo press is controlled by a computer to provide constant pressure, and the rock sample is cylindrical.
The invention also provides a test method adopting the rock high-temperature shear test device, which comprises the following steps:
step 1: high-temperature confining pressure loading unit
Firstly, installing a resistance heating ring in a rigid heat-insulation frame 1, secondly, installing a connecting pipe 6 in the rigid heat-insulation frame 1, installing a flexible metal mesh bag 4 at the joint at the inner side of the connecting pipe 6, and filling silicon carbide particles 3 in the connecting pipe 6 and the flexible metal mesh bag 4; then, a servo press 7 is installed at the outer joint of the connection pipe 6, and silicon carbide particles 3 are filled in a portion of the servo press 7 adjacent to the connection pipe 6.
Step 2: SHPB dynamic loading unit
Firstly, a sample 5 is arranged in a cavity area surrounded by a flexible metal mesh bag 4; and secondly, adjusting the vertical height of the whole high-temperature confining pressure loading part to enable two sides of the sample 5 to be respectively contacted with the incident rod 8 and the hollow transmission rod 9.
And step 3: the servo press 7 is started to uniformly coat the silicon carbide particles 3 on the ring surface of the sample 5, the center of the sample 5 is aligned with the centers of the incident rod 8 and the hollow transmission rod 9 by adjusting the pressure of the servo press 7 in each direction, and the incident rod 8 and the hollow transmission rod 9 are contacted with the sample 5.
And 4, step 4: the resistance heating coil 2 is applied with a voltage to raise its temperature while the servo press 7 sets a target pressure and maintains it until the temperature of the sample 5 reaches the target temperature.
And 5: stress waves are applied to the incident rod 8 through a trigger device of a conventional Hopkinson pressure bar test, and strain changes of the incident rod 8 and the hollow transmission rod 9 are monitored and recorded. The dynamic shear strength of the test specimen can be calculated by the following formula:
in the formula TdDynamic shear strength; p is a radical ofmaxThe maximum dynamic load is obtained by converting strain gauges and elastic modulus on the incident rod (8) and the transmission rod (9); r and R are the inner radius of the transmission rod and the radius of the incident rod respectively; d is the thickness of the sample. The shear strain rate was:
in the formula
Is the shear strain rate; v. ofpIs the longitudinal wave velocity of the rock; epsilonI、εRAnd εTIncident strain, reflection strain and transmission strain are measured by a strain gauge on the incident rod (8) in sequence, and the transmission strain is measured by a strain gauge on the transmission rod (9).
Step 6: and after the impact shear test is finished, firstly, the pressure of the servo press 7 is removed, secondly, the voltage applied to the resistance heating ring 2 is stopped, finally, the sample is replaced, and the steps 3-6 are repeated.
The working principle of the rock high-temperature shearing test device suitable for the split Hopkinson bar provided by the invention is as follows: the shear stress process of the rock material under the impact condition can be realized by installing the incident rod 8, the rock sample 5 and the hollow transmission rod 9 according to the positions shown in figure 2, and the sample after dynamic shear failure can be collected by the cavity of the hollow transmission rod 9. Parameters such as strain rate during impact can be obtained by strain gauges attached to the incident rod 8 and the transmission rod 9. Simultaneously, with rock sample 5, flexible metal mesh bag 4, silicon carbide particle 3, resistance heating circle 2, rigidity heat preservation frame 1, connecting pipe 6 and servo press 7 are installed according to the mode as shown in fig. 1 and fig. 3, servo press 7 when 4 ascending directions produces pressure simultaneously and can promote silicon carbide particle 3 and inwards extrude, under rigidity heat preservation frame 1's counter-force effect, silicon carbide particle 3's pressure is conducted on sample 5's arcwall face, can realize the application of rock sample equipartition confined pressure all around. The heat generated by the resistance heating coil in the rigid insulating frame 1 can also be conducted to the sample via the silicon carbide particles 3. Thus, the synchronous loading of temperature and pressure on the rock sample is realized.
The invention solves the problem that the prior art can not synchronously apply high temperature and confining pressure while dynamically shearing and loading the sample; the silicon carbide particles are used as a conducting medium for pressure and temperature, so that accurate and rapid control can be realized, lateral friction force can be applied to the sample by the self-locking effect of the particles after confining pressure is applied, the sample cannot move in the horizontal direction, and high-precision kinetic parameters can be obtained. The invention has the advantages of modularized installation, fast temperature loading, convenient assembly and disassembly, low preparation requirement on rock samples and the like.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. The utility model provides a rock high temperature shear test device suitable for disconnect-type hopkinson pole which characterized in that: the device comprises a high-temperature confining pressure loading unit and an SHPB dynamic loading unit;
a heating element (2), silicon carbide particles (3) wrapped in a flexible metal mesh bag (4) and a rock sample (5) are sequentially nested in a rigid heat-insulating frame (1) of the high-temperature confining pressure loading unit from outside to inside, and a servo press (7) acting on the silicon carbide particles (3) is arranged on the rigid heat-insulating frame (1);
and an incident rod (8) and a transmission rod (9) of the SHPB dynamic loading unit are respectively aligned to two opposite ends of the rock sample (5).
2. A rock high temperature shear test apparatus according to claim 1, wherein: the servo presses (7) are uniformly distributed along the circumferential direction of the rock sample (5);
the flexible metal mesh bag (4) is connected with a piston rod end of the servo press machine (7) in a sliding mode through a connecting pipe (6), and silicon carbide particles (3) are filled in the connecting pipe (6).
3. A rock high temperature shear test apparatus according to claim 2, wherein: the side part of the rigid heat-insulating frame (1) is provided with a hole for the connecting pipe (6) to pass through, and the two ends of the rigid heat-insulating frame are provided with holes for the incident rod (8) and the transmission rod (9) to pass through.
4. A rock high temperature shear test apparatus according to claim 3, wherein: the rigid heat-insulating frame (1) is fixedly connected with the connecting pipe (6).
5. A rock high temperature shear test apparatus according to claim 1, wherein: the heating element (2) is a rigid resistance heating coil.
6. A rock high temperature shear test apparatus according to claim 5, wherein: the resistance heating ring is internally provided with a temperature sensing element, and the voltage of the resistance heating ring is automatically adjusted by a computer according to the temperature of the temperature sensing element so as to realize the constant maintenance of the temperature.
7. A rock high temperature shear test apparatus according to any one of claims 1 to 6, wherein: the particle size of the silicon carbide particles (3) is less than 1 mm;
the diameter of the metal wire of the flexible metal mesh bag (4) is less than 0.5mm and the aperture is less than 0.5 mm.
8. A rock high temperature shear test apparatus according to any one of claims 1 to 6, wherein: the transmission rod (9) is of a hollow rod body structure, the outer diameter of the transmission rod is consistent with the diameter of the rock sample (5), and the inner diameter of the transmission rod is larger than the diameter of the incidence rod (8).
9. A rock high temperature shear test device according to any of claims 1 to 6, wherein the rock sample (5) is cylindrical.
10. A rock high-temperature shear test method suitable for a split hopkinson bar, using the rock high-temperature shear test apparatus of any one of claims 1 to 9, comprising the steps of:
step 1, installing a high-temperature confining pressure loading unit
Firstly, a heating element (2) is installed in a rigid heat-preservation frame (1); secondly, a flexible metal mesh bag (4) is arranged in the rigid heat-insulation frame (1), and silicon carbide particles (3) are filled in the flexible metal mesh bag (4); then, a servo press (7) is arranged on the rigid heat-insulating frame (1), and the piston rod end of the servo press (7) acts on the silicon carbide particles (3) in the flexible metal mesh bag (4);
step 2, installing SHPB dynamic loading unit
Firstly, a sample (5) is arranged in a cavity area surrounded by a flexible metal mesh bag (4); secondly, adjusting the vertical height of the whole temperature confining pressure loading unit to enable two ends of the sample (5) to be respectively contacted with an incident rod (8) and a transmission rod (9) of the SHPB dynamic loading unit;
step 3, starting a servo press (7) to uniformly coat the silicon carbide particles (3) on the ring surface of the sample (5), aligning the center of the sample (5) with the centers of the incident rod (8) and the transmission rod (9) by adjusting the pressure of the servo press (7) in each direction, and enabling the incident rod (8) and the hollow transmission rod (9) to contact the sample (5);
step 4, setting the pressure of the servo press (7) as a target pressure, and heating the sample (5) to a set temperature by using the heating element (2) under the condition of ensuring that the confining pressure is not changed;
step 5, applying stress waves to the incident rod (8) through a trigger device of the SHPB dynamic loading unit, monitoring and recording the strain changes of the incident rod (8) and the hollow transmission rod (9);
and 6, analyzing the deformation and damage conditions of the sample material by using the measured incident wave, transmitted wave and reflected wave to obtain the dynamic mechanical property data of the sample, wherein the dynamic shear strength of the sample is as follows:
in the formula: t isdDynamic shear strength;
pmaxthe maximum dynamic load is obtained by converting strain gauges and elastic modulus on the incident rod (8) and the transmission rod (9);
r and R are the radius of the inner cavity of the transmission rod and the radius of the incident rod respectively;
d is the thickness of the sample;
the shear strain rate of the sample was:
in the formula:
is the shear strain rate;
vpis the longitudinal wave velocity of the rock;
εI、εRand εTIncident strain, reflection strain and transmission strain are measured by a strain gauge on the incident rod (8) in sequence, and the transmission strain is measured by a strain gauge on the transmission rod (9).
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| CN111678806A (en) * | 2020-05-11 | 2020-09-18 | 江苏禹治流域管理技术研究院有限公司 | SHPB rock shear test device and method under normal stress condition |
| CN112284901A (en) * | 2020-10-28 | 2021-01-29 | 贵州大学 | Pseudo-triaxial rock testing machine and using method thereof |
| CN112857965A (en) * | 2021-01-08 | 2021-05-28 | 北京理工大学 | High-temperature heating system for SHPB test |
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| CN113588460A (en) * | 2021-07-27 | 2021-11-02 | 中南大学 | High-temperature triaxial SHPB device for rock and assembling method and testing method thereof |
| CN113776961A (en) * | 2021-08-31 | 2021-12-10 | 重庆交通大学 | Temperature and pressure synchronous loading device and method suitable for rock dynamics test |
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| CN114965019A (en) * | 2022-06-16 | 2022-08-30 | 山东科技大学 | Dynamic load shear test device and method based on Hopkinson bar system |
| CN114965099A (en) * | 2022-05-18 | 2022-08-30 | 合肥工业大学 | Device and method for testing interlaminar shear strength of fiber reinforced composite material |
| CN116818557A (en) * | 2022-12-07 | 2023-09-29 | 天津大学 | Mechanical test device and test method |
| US11821874B1 (en) | 2022-06-16 | 2023-11-21 | Shandong University Of Science And Technology | Dynamic load shearing test device and method based on hopkinson bar system |
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