Hopkinson torsion bar high and low temperature test equipment

Abstract

The invention relates to the technical field of experimental equipment, in particular to Hopkinson torsion bar high and low temperature test equipment, which comprises a temperature adjusting device, a temperature control device, a Hopkinson torsion bar, a Hopkinson torsion bar, a Hopkinson torsion bar, a Hopkinson torsion bar, a Hopkinson torsion bar and a Hopkinson torsion bar, the testing device comprises a fixing assembly and an incident rod which are coaxially arranged, the fixing assembly is provided with a sample fixing groove, the sample fixing groove is formed in the testing space, a first to-be-tested sample can be fixed in the sample fixing groove, a sample fixing part is arranged at the first end of the incident rod, and a second to-be-tested sample can be fixed to the sample fixing part. A mud breaking layer is further arranged between the first to-be-tested sample and the second to-be-tested sample, the first end of the incident rod can drive the second to-be-tested sample to extend into the sample fixing groove, and the first to-be-tested sample rotates while applying pressure towards the fixing assembly to the first to-be-tested sample. Therefore, the problems that the experiment needs to be transferred after being subjected to high-temperature and low-temperature treatment in the friction experiment and the experiment result is influenced are solved.

Description

Technical Field

[0001] The invention relates to the technical field of experimental equipment, in particular to a Hopkinson torsion bar high and low temperature test equipment. Background Art

[0002] In friction experiments, the dynamic friction and sliding properties of rock faults under high temperature or ice avalanches under low temperature must be treated with high or low temperature samples. At present, many researchers have developed a variety of high and low temperature test chambers, mainly including test chamber bodies, test chamber doors, heating control systems, refrigeration control systems and electrical control systems, which can independently achieve high and low temperature environments and even intelligent continuous temperature control.

[0003] In the prior art, the high temperature or low temperature treatment of the sample and the friction test are carried out in two independent devices. When conducting the high and low temperature test, the sample is placed in a high and low temperature test chamber in advance, heated or cooled to a preset temperature, and then placed in a mechanical testing device for testing. When conducting the above tests, the sample can only be loaded after being subjected to high and low temperature treatment in the high and low temperature test chamber. The temperature of the sample after temperature treatment will inevitably change during the transfer process, affecting the final test effect. Summary of the invention

[0004] In order to solve the problem that the high and low temperature treatment of the experiment needs to be transferred and affects the experimental results in the friction experiment, the present invention provides a Hopkinson torsion bar high and low temperature test equipment, including: an insulation box, a temperature regulating device and a test device; a test space that can be closed is arranged in the insulation box, the temperature regulating device is connected to the test space and can increase or decrease the temperature of the test space to reach the set test temperature; the test device includes a coaxially arranged fixing component and an incident rod, the test device is arranged to extend in the horizontal direction, the fixing component is provided with a sample fixing groove, the sample fixing groove is arranged in the test space, a first sample to be tested can be fixed in the sample fixing groove, a first end of the incident rod is provided with a sample fixing part, a second sample to be tested can be fixed to the sample fixing part, a broken mud layer is also arranged between the first sample to be tested and the second sample to be tested, the first end of the incident rod can drive the second sample to be tested to extend into the sample fixing groove, and apply pressure toward the fixing component to the first sample to be tested while rotating.

[0005] In some embodiments, the temperature control device includes a cooling component, which includes an air inlet channel, an exhaust channel, a circulating fan and a refrigerator. The air outlet end of the air inlet channel is arranged at the bottom of the test space, and the air inlet end of the exhaust channel is arranged at the top of the test space. The circulating fan is arranged in the air inlet channel and can introduce external air into the air inlet channel. The refrigerator is used to cool the gas flowing into the air inlet channel.

[0006] In some embodiments, a filter screen and a wind direction regulator are sequentially arranged at the air outlet end of the air inlet channel along the gas flow direction, and the wind direction regulator includes a swingable adjustment baffle to adjust the flow direction of the gas entering the test space through the adjustment baffle.

[0007] In some embodiments, the temperature control device further includes a heating component, the heating component includes a plurality of heating resistors, and the plurality of heating resistors are evenly distributed on the inner wall of the test space.

[0008] In some embodiments, the Hopkinson torsion bar high and low temperature test equipment also includes a base, and the insulation box includes a main body and a reaction seat assembly; the main body can be fixed on the base, the test space is arranged in the main body, and an opening connected to the test space is also arranged on one side of the main body, and the reaction seat assembly can be fixed at the opening and close the test space; the reaction seat assembly has a relatively high weight, and the fixing assembly is arranged on the side of the reaction seat assembly facing the test space.

[0009] In some embodiments, a slide rail is provided on the base, and the reaction force seat assembly includes a first state and a second state. In the first state, the reaction force seat assembly is fixed at the opening. In the second state, the reaction force seat assembly is away from the main body and drives the fixed assembly to leave the test space through the opening. The reaction force seat assembly can slide along the extension direction of the slide rail so that the reaction force seat assembly can be converted between the first state and the second state.

[0010] In some embodiments, the reaction seat assembly includes a reaction seat and a fixed seat, the fixed seat is cylindrical, the first end of the fixed seat is arranged at the center of the side of the reaction seat facing the main body, and the second end of the fixed seat is connected to the fixed assembly; the shape of the opening matches the fixed seat, and the fixed seat can be sealed in the opening.

[0011] In some embodiments, the fixing assembly includes a fixing rod, a fixing sleeve and a center block assembly, the first end of the fixing rod is connected to the reaction force seat assembly, the end of the fixing rod facing away from the reaction force seat assembly is provided with a sample bonding surface, the fixing sleeve is arranged around the sample bonding surface, the center block assembly is fixedly arranged at the center position of the sample bonding surface, there is a gap between the center block assembly and the inner side wall of the fixing sleeve, and a sample fixing groove is formed, and an annular strain gauge is provided at the position where the inner circumferential surface of the fixing sleeve contacts the first sample to be tested and the second sample to be tested.

[0012] In some embodiments, the fixed sleeve is provided with a connection port corresponding to the broken mud layer, the connection port passes through the side wall of the fixed sleeve, and the connection port is used to connect to a water inlet system, and the water inlet system can introduce pressurized liquid into the broken mud layer through the connection port.

[0013] In some embodiments, the fixed component also includes a temperature sensor, which includes a sensor body and a connecting line connected to the sensor body, and the sensor body is arranged at the intersection of the broken mud layer and the central block assembly; the fixed component also includes a temperature measuring channel, which passes through the fixed rod and the central block assembly in sequence, so that the connecting line can extend to the outside of the insulation box through the temperature measuring channel.

[0014] In some embodiments, a door is provided on the side of the body, which can be opened to connect the test space with the outside of the body; the body is also provided with an observation window for observing the test space; the test space is also provided with an illumination light source and a high-speed camera, which can record the experimental process.

[0015] In some embodiments, the Hopkinson torsion bar high and low temperature test equipment further includes a control device, which is electrically connected to the temperature regulating device, the water inlet system, and the temperature sensor.

[0016] In order to solve the problem that the high and low temperature treatment in the friction experiment needs to be transferred and affects the experimental results, the present invention has the following advantages:

[0017] In the above technical solution, a closed heat-insulating box is used to form a stable test space isolated from the outside world, and a temperature regulating device is used to adjust the temperature of the test space, thereby realizing temperature regulation of the sample arranged therein so that it reaches the set test temperature; the test device arranged therein can perform a friction test after the sample reaches the set test temperature. Since the entire test process is carried out in the test space, the need to transfer the sample after it reaches the set temperature can be avoided. Therefore, the impact on the experiment can be minimized. The installation process of the test sample used in the experiment is relatively cumbersome, which is aggravated when it reaches the set temperature. It is difficult for the experimenter to quickly install it on the test device. The Hopkinson torsion bar high and low temperature test equipment in the above technical solution avoids the step of installing the sample during the test, effectively reduces the operating difficulty of the experimenter, and improves the experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the external structure of a Hopkinson torsion bar high and low temperature test device according to an embodiment is shown;

[0019] Figure 2 A schematic cross-sectional view of a Hopkinson torsion bar high and low temperature test device according to an embodiment is shown;

[0020] Figure 3 Shows Figure 2 A partial enlarged view of the middle A part;

[0021] Figure 4A schematic diagram of the external structure of a heat preservation box according to an embodiment is shown;

[0022] Figure 5 A schematic structural diagram of a reaction seat assembly according to an embodiment is shown.

[0023] Figure markings: 10-insulation box; 11-test space; 12-main body; 121-box door; 122-observation window; 13-reaction seat assembly; 131-reaction seat; 132-fixed seat; 14-plug; 21-cooling assembly; 211-air inlet channel; 2111-wind direction regulator; 212-exhaust channel; 22-heating assembly; 30-test device; 31-fixing assembly; 312-fixing rod; 3121-avoidance port; 313-fixing sleeve; 3131-connecting port; 314-center block assembly; 316-temperature measurement channel; 32-incident rod; 321-sample fixing part; 41-first sample to be tested; 42-second sample to be tested; 43-broken mud layer; 50-base; 51-slide rail; 60-control device. DETAILED DESCRIPTION

[0024] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0025] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0026] This embodiment discloses a Hopkinson torsion bar high and low temperature test device, such as Figures 1 to 5As shown, it may include an insulation box 10, a temperature regulating device and a test device 30; a test space 11 that can be closed is arranged in the insulation box 10, the temperature regulating device is connected to the test space 11 and can increase or decrease the temperature of the test space 11 to reach the set test temperature; the test device 30 includes a coaxially arranged fixing component 31 and an incident rod 32, the test device 30 is arranged to extend in the horizontal direction, the fixing component 31 is provided with a sample fixing groove, the sample fixing groove is arranged in the test space 11, the first sample to be tested 41 can be fixed in the sample fixing groove, the first end of the incident rod 32 is provided with a sample fixing portion 321, the second sample to be tested 42 can be fixed to the sample fixing portion 321, and a mud layer 43 is also arranged between the first sample to be tested 41 and the second sample to be tested 42, the first end of the incident rod 32 can drive the second sample to be tested 42 to extend into the sample fixing groove, and apply pressure toward the fixing component 31 to the first sample to be tested 41 while rotating.

[0027] It should be noted that the Hopkinson torsion bar is a device that can perform dynamic experimental tests. The basic principle is to place the sample between two long rods, borrow the characteristics of elastic one-dimensional stress waves, apply dynamic load (incident wave) to the sample through the incident rod 32, and then detect its dynamic response results in the transmission rod. This device has significant advantages in studying high strain rate related issues of materials. This test method has been widely used in the field of tribology, especially high-speed friction experiments based on the Hopkinson torsion bar. The Hopkinson torsion bar high and low temperature test equipment in the above technical solution of this application is mainly used in high-speed friction experiments. The incident rod 32 is a homogeneous solid rod-shaped structure, and the cross-sectional shape of each position is the same. The incident rod 32 can be driven by the loading system to drive the second sample 42 to be tested set thereon to rotate relative to the first sample 41 to be tested, and apply pressure to the sample to be tested.

[0028] In the above technical solution, a closed heat-insulating box 10 is used to form a stable test space 11 isolated from the outside world, and a temperature control device is used to adjust the temperature of the test space 11, thereby realizing temperature adjustment of the sample arranged therein so that it reaches the set test temperature; the test device 30 arranged therein can perform a friction test after the sample reaches the set test temperature. Since the entire test process is carried out in the test space 11, the need to transfer the sample after it reaches the set temperature can be avoided. Therefore, the impact on the experiment can be minimized. The installation process of the test sample used in the experiment is relatively cumbersome, which is aggravated when it reaches the set temperature. It is difficult for the experimenter to quickly install it on the test device 30. The Hopkinson torsion bar high and low temperature test equipment in the above technical solution avoids the step of installing the sample during the test process, effectively reduces the operating difficulty of the experimenter, and improves the experimental efficiency.

[0029] As a specific implementation, the first sample to be tested 41 and the second sample to be tested 42 are bonded to the fixing assembly 31 and the incident rod 32 by an adhesive. The adhesive is preferably epoxy resin. During the implementation, the epoxy resin bonding thickness is required to be consistent to avoid uneven friction surfaces. The shear strength of the epoxy resin must meet the friction test requirements to avoid friction failure due to insufficient shear strength. In particular, for the second sample to be tested 42, if friction failure occurs, it will cause inconsistent rotation between it and the incident rod 32. Specifically, the minimum shear strength τ required for the epoxy resin is s To meet:

[0030]

[0031] Wherein, r1 and r2 are the inner and outer radii of the annular sample, respectively, l is the thickness of the annular sample, μ is the friction coefficient of polytetrafluoroethylene, τ is the shear stress on the sliding surface, and the shear stress on the sliding surface is considered to be approximately uniformly distributed, and p is the side pressure exerted on the second sample 42 to be tested during the experiment.

[0032] A sliding bearing may also be provided in the hole through which the incident rod 32 passes through the side wall of the heat preservation box 10. Specifically, the sliding bearing may be a polytetrafluoroethylene block sliding bearing. Polytetrafluoroethylene has excellent physical and chemical properties, can maintain stable performance in various harsh environments, has a wide operating temperature range, and has an extremely low friction coefficient, which helps to reduce the friction and wear of the incident rod 32 during operation and improve the service life of the incident rod 32. The use of polytetrafluoroethylene has good self-lubrication and does not require additional lubricants, which can effectively reduce maintenance costs. When the Hopkinson torsion bar test is not performed, the through hole for the incident rod 32 to extend can also be plugged with a special plug 14. Specifically, the plug 14 may be a truncated cone structure, the main body of which is made of melamine fireproof sponge, in a truncated cone shape, with a larger diameter on the side facing the test space 11, so that the through hole can be more stable when plugged.

[0033] The minimum temperature of the low temperature test is not less than -10°C. Generally speaking, the low temperature test temperature is about 0 degrees. In order to cool the test space 11 and the first sample 41 and the second sample 42 to be tested therein and meet the temperature requirements of the low temperature test, Figure 2 As shown, the temperature control device includes a cooling component 21, and the cooling component 21 includes an air inlet channel 211, an exhaust channel 212, a circulating fan and a refrigerator. The air outlet end of the air inlet channel 211 is arranged at the bottom of the test space 11, and the air inlet end of the exhaust channel 212 is arranged at the top of the test space 11. The circulating fan is arranged in the air inlet channel 211 and can introduce external air into the air inlet channel 211. The refrigerator is used to cool the gas flowing into the air inlet channel 211.

[0034] In this embodiment, the gas flowing into the test space 11 is cooled by air cooling. When these low-temperature gases flow through the test device 30, heat exchange can occur, and the heat in the test device 30 is taken away with the airflow. Since cold air has a higher density than hot air, the air inlet is set at the bottom of the test space 11, and the air outlet for discharging high-temperature gas is set on the upper side of the test space 11, so that the colder air flows from bottom to top, so that the gas in the test space 11 can be completely replaced by the lower temperature gas flowing in, thereby improving the efficiency of lowering the temperature. The circulating fan is used to actively suck the outside air into the air inlet channel 211, and the refrigerator can exchange heat with the air flowing into the air inlet channel 211 and reduce its temperature, so that the test space 11 can reach the predetermined temperature requirement. The refrigerator can be integrated into the thermal insulation box 10. In order to ensure the heat dissipation of the refrigerator, a grille or other structure for heat dissipation can be set at the corresponding position.

[0035] As an implementation method, in order to keep the gas entering the test space 11 clean, Figure 2 As shown, a filter screen and a wind direction regulator 2111 are sequentially arranged at the air outlet end of the air inlet channel 211 along the gas flow direction. The wind direction regulator 2111 includes a swingable adjustment baffle to adjust the flow direction of the gas entering the test space 11 through the adjustment baffle.

[0036] The mesh size of the filter can be appropriately selected according to the laboratory environment. Furthermore, multiple filters can be set to intercept different pollutants. In addition, the setting of the adjustment baffle of the wind direction regulator 2111 can change the flow direction of the gas. More specifically, the wind direction regulator 2111 may include a driver that can drive the adjustment baffle to swing, so that the adjustment baffle can swing automatically, so that the airflow flowing through can blow a larger range when it flows into the test space 11. On the one hand, the airflow flowing through can fully surround the test device 30, so that the entire test device is cooled evenly. On the other hand, it avoids the formation of temperature dead corners to improve the cooling efficiency. At the same time, the air inlet channel 211 can be respectively provided with multiple, or a main channel can be divided into multiple sub-channels during the extension process. These sub-channels can be arranged around the test device 30 to improve the uniformity of the cooling process.

[0037] In some embodiments, Figure 2 As shown, the temperature control device further includes a heating component 22 , and the heating component 22 includes a plurality of heating resistors, and the plurality of heating resistors are evenly distributed on the inner wall of the test space 11 .

[0038] Through multiple evenly distributed heating resistors, the test space 11 can be evenly heated as a whole, thereby fully heating the test device 30 therein and meeting the temperature requirements of the high temperature experiment. It should be noted that in order to prevent heat loss, when the heating component 22 is working, the air inlet channel 211 and the exhaust channel 212 of the cooling component 21 need to be closed.

[0039] At the same time, in order to prevent the test space 11 from exchanging heat with the outside through the heat preservation box 10, resulting in low temperature control efficiency, it is understandable that a heat insulation material is provided on the side wall of the heat preservation box 10. As a preferred embodiment, the heat insulation material can be selected from melamine fireproof sponge, which is a highly flexible high and low temperature resistant foam plastic.

[0040] Since the incident rod 32 is driven by the loading system during the test, the fixing assembly 31 will be subjected to a large force exerted by the incident rod 32, which may cause the experimental equipment to move. To avoid this situation, Figure 1 , Figure 5 As shown, the Hopkinson torsion bar high and low temperature test equipment also includes a base 50, and the insulation box 10 includes a main body 12 and a reaction seat assembly 13; the main body 12 can be fixed on the base 50, and the test space 11 is arranged in the main body 12, and an opening connected to the test space 11 is also arranged on one side of the main body 12, and the reaction seat assembly 13 can be fixed at the opening and close the test space 11; the reaction seat assembly 13 has a relatively high weight, and the fixing assembly 31 is arranged on the side of the reaction seat assembly 13 facing the test space 11.

[0041] First, fixing the body 12 on the base 50 can offset the force applied by the incident rod 32 to a certain extent. At the same time, the reaction seat assembly 13 with a relatively high weight can further offset the force generated when the incident rod 32 moves. In addition, a rigid wall with a relatively high weight (i.e., the reaction seat assembly 13) can reduce the mass and volume of the fixed assembly 31. This is because after friction occurs, the signal mainly propagates along the direction of the incident rod 32, and the setting of the rigid wall will not affect the analysis of the dynamic friction response, thereby achieving a better experimental effect.

[0042] Since the reaction seat assembly 13 has a large weight, in order to be able to open the reaction seat assembly 13 and install the first to-be-tested sample 41 on the fixing assembly 31 disposed thereon, and to perform maintenance and debugging on the fixing assembly 31 and other equipment, such as Figure 1As shown, a slide rail 51 is provided on the base 50, and the reaction seat assembly 13 includes a first state and a second state. In the first state, the reaction seat assembly 13 is fixed at the opening. In the second state, the reaction seat assembly 13 is away from the body 12 and drives the fixing assembly 31 to leave the test space 11 through the opening. The reaction seat assembly 13 can slide along the extension direction of the slide rail 51 so that the reaction seat assembly 13 can be converted between the first state and the second state.

[0043] The setting of the slide rail 51 can relatively easily move the reaction seat assembly 13. Specifically, the slide rail 51 can be set to extend in a straight line direction, simply moving the reaction seat assembly 13 away from the body 12, but the slide rail 51 can also be set in a curve, so that the reaction seat assembly 13 moves to one side of the body 12 and opens in a manner similar to opening a door. This movement method can reduce the moving distance of the reaction seat assembly 13 and reduce the footprint of the experimental equipment.

[0044] As a specific implementation method, Figure 5 As shown, the reaction seat assembly 13 includes a reaction seat 131 and a fixed seat 132. The fixed seat 132 is cylindrical. The first end of the fixed seat 132 is arranged at the center of the side of the reaction seat 131 facing the body 12, and the second end of the fixed seat 132 is connected to the fixing assembly 31; the shape of the opening matches the fixed seat 132, and the fixed seat 132 can be sealed in the opening.

[0045] By setting the fixed seat 132 at the center of the reaction seat 131, the fixed seat 132 is designed to be cylindrical and fixed on the baffle. The diameter can be 5-7 times that of the fixed rod 312 included in the fixed assembly 31. The wave impedance of the incident rod 32 and the fixed seat 132 differs by more than 20 times. After the friction event occurs, it will theoretically propagate in two directions respectively. However, due to the constraint of the wave impedance, it can be approximately considered that all the friction behavior information is transmitted to the incident rod 32.

[0046] In some embodiments, Figure 2 , Figure 3 As shown, the fixing assembly 31 includes a fixing rod 312, a fixing sleeve 313 and a center block assembly 314. The first end of the fixing rod 312 is connected to the reaction seat assembly 13. The end of the fixing rod 312 facing away from the reaction seat assembly 13 is provided with a sample bonding surface. The fixing sleeve 313 is arranged around the sample bonding surface. The center block assembly 314 is fixedly arranged at the center position of the sample bonding surface. There is a gap between the center block assembly 314 and the inner side wall of the fixing sleeve 313 to form a sample fixing groove. The outer peripheral surface of the fixing sleeve 313 is provided with annular strain gauges at the position in contact with the first sample 41 to be tested and the second sample 42 to be tested.

[0047] The fixing rod 312 is used to connect with the reaction seat assembly 13, so as to be fixed on the reaction seat 131. The sample bonding surface can be used to bond the sample to be tested. Since the first sample to be tested 41 and the second sample to be tested 42 are both annular, a center block assembly 314 can be set at their center positions. Specifically, the center block assembly 314 can include a plurality of cylindrical center blocks made of polytetrafluoroethylene. The plurality of center blocks are arranged in sequence and fixed on the sample bonding surface. The fixing method can be bolts, pins and other appropriate methods. The setting of the annular strain gauge is used to measure the annular tensile strain ε of the fixed sleeve 313 during the friction test. During the experiment, the sample to be tested in the experiment will be subjected to the pressure issued by the loading system. When subjected to the pressure transmitted from the incident rod 32, the sample will expand in the radial direction and squeeze the inner circumferential wall of the fixed sleeve 313. In order to resist this squeezing effect, the inner circumferential wall will apply a confining pressure to the sample to be tested under the action of elastic deformation. According to the relevant theory of thick-walled sleeves, the compressive stress p of the inner wall of the fixed sleeve 313 can be obtained by:

[0048]

[0049] In the formula, R1 is the radius of the inner wall of the fixed sleeve 313, R2 is the radius of the outer wall of the fixed sleeve 313; E is the elastic modulus of the fixed sleeve 313; ε is the Poisson's ratio of the fixed sleeve 313 (only ordinary positive Poisson's ratio materials are considered). In the whole process, it can be considered that the inner wall of the fixed sleeve 313 and the circular ring sample to be tested inside are tightly closed, and it is considered that the confining pressure stress of the circular ring sample is equal to the compressive stress p of the inner wall of the sleeve.

[0050] Under some experimental conditions, it is necessary to be able to pass a pressurized liquid into the fault mud layer 43. The liquid is usually water, such as Figure 2 , Figure 3 As shown, the experimental equipment may also include: a connecting port 3131 is provided on the fixed sleeve 313 corresponding to the broken mud layer 43, the connecting port 3131 passes through the side wall of the fixed sleeve 313, and the connecting port 3131 is used to connect to a water inlet system, and the water inlet system can introduce pressurized liquid into the broken mud layer 43 through the connecting port 3131.

[0051] Specifically, the water inlet system includes a water pressure device, a water inlet pipe and a water outlet pipe. The water inlet and outlet pipes can be extended into the test space 11 through the grooves provided on the fixed rod 312 and connected to the connection port 3131. The grooves provided on the fixed rod 312 are provided at the place where the fixed rod 312 passes through the side wall of the heat preservation box, wherein the connection port 3131 can be divided into a water inlet and a water outlet. The water pressure device can adjust and control the amount and pressure of the pressure liquid input into the water inlet and outlet pipes, thereby realizing the controllable regulation of pore water pressure and quantitative simulation of osmotic pressure in the deep environment. At the same time, the water outlet pipe is used for drainage, so as to discharge the pressure liquid after the experiment.

[0052] To accurately monitor the experimental process, Figure 1 , Figure 2 , Figure 3 As shown, the fixed component 31 also includes a temperature sensor, which includes a sensor body 12 and a connecting line connected to the sensor body 12, and the sensor body 12 is arranged at the intersection of the broken mud layer 43 and the central block component 314; the fixed component 31 also includes a temperature measuring channel 316, and the temperature measuring channel 316 passes through the fixed rod 312 and the central block component 314 in sequence, so that the connecting line can extend to the outside of the insulation box 10 through the temperature measuring channel 316.

[0053] In this embodiment, the temperature sensor needs to be fixedly arranged on the inner circumference of the annular sample to be tested, specifically, it can be arranged corresponding to the broken mud layer 43, and is used to accurately measure the temperature of the friction interface during the test. The setting of the temperature measuring channel 316 is convenient for the wire of the temperature sensor to extend from the experimental device on the one hand, and on the other hand, it can also play a role in protecting the wire. In addition, the temperature sensor can be fixed between two adjacent central blocks. When these central blocks are disassembled, it is convenient to disassemble and maintain the temperature sensor. At the same time, the fixing rod 312 can also be provided with a avoidance port 3121 for the inlet and outlet pipes of the water supply system to extend into.

[0054] As a specific implementation method, Figure 1 , Figure 4 As shown, a box door 121 is provided on the side of the body 12, and the box door 121 can be opened to connect the test space 11 with the outside of the body 12; the body 12 is also provided with an observation window 122 for observing the test space 11; and an irradiation light source and a high-speed camera are also provided in the test space 11, and the high-speed camera can shoot the experimental process. The observation window 122 can be made of double-layer transparent glass material, which is used to observe the test process in the box in real time. The irradiation light source provides an appropriate light environment for observation and the operation of the high-speed camera, so as to facilitate observation.

[0055] At the same time, if Figure 1 As shown, the Hopkinson torsion bar high and low temperature test equipment also includes a control device 60, which is electrically connected to the temperature control device, the water inlet system and the temperature sensor. The control device 60 can be integrated on the insulation box 10 to facilitate the operator to control and operate. The control device 60 can be a computer, an industrial computer or other equipment with computing and data storage functions.

[0056] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A Hopkinson torsion bar high and low temperature test equipment, characterized in that: The Hopkinson torsion bar high and low temperature test equipment includes: Insulation box, temperature control device and test device; The heat preservation box is provided with a closable test space, and the temperature regulating device is connected to the test space and can increase or decrease the temperature of the test space to reach a set test temperature; The test device includes a coaxially arranged fixing component and an incident rod. The test device is arranged to extend in a horizontal direction. The fixing component is provided with a sample fixing groove, and the sample fixing groove is arranged in the test space. The first sample to be tested can be fixed in the sample fixing groove. The first end of the incident rod is provided with a sample fixing portion, and the second sample to be tested can be fixed to the sample fixing portion. A broken mud layer is also provided between the first sample to be tested and the second sample to be tested. The first end of the incident rod can drive the second sample to be tested to extend into the sample fixing groove, and apply pressure toward the fixing component to the first sample to be tested while rotating it.

2. The Hopkinson torsion bar high and low temperature test equipment according to claim 1, characterized in that: The temperature control device includes a cooling component, which includes an air inlet channel, an exhaust channel, a circulating fan and a refrigerator. The air outlet end of the air inlet channel is arranged at the bottom of the test space, and the air inlet end of the exhaust channel is arranged at the top of the test space. The circulating fan is arranged in the air inlet channel and can introduce external air into the air inlet channel. The refrigerator is used to cool the gas flowing into the air inlet channel.

3. The Hopkinson torsion bar high and low temperature test equipment according to claim 2, characterized in that: The air outlet end of the air inlet channel is provided with a filter screen and a wind direction regulator in sequence along the gas flow direction. The wind direction regulator includes a swingable regulating baffle to regulate the flow direction of the gas entering the test space through the regulating baffle.

4. The Hopkinson torsion bar high and low temperature test equipment according to claim 1, characterized in that: The temperature regulating device further comprises a heating component, wherein the heating component comprises a plurality of heating resistors, and the plurality of heating resistors are evenly distributed on the inner wall of the test space.

5. The Hopkinson torsion bar high and low temperature test equipment according to claim 1, characterized in that: The Hopkinson torsion bar high and low temperature test equipment also includes a base, and the heat preservation box includes a main body and a reaction seat assembly; The body can be fixed on the base, the test space is arranged in the body, one side of the body is also provided with an opening connected to the test space, and the reaction seat assembly can be fixed at the opening and close the test space; The reaction seat assembly has a relatively high weight, and the fixing assembly is arranged on a side of the reaction seat assembly facing the test space.

6. The Hopkinson torsion bar high and low temperature test equipment according to claim 5, characterized in that: A slide rail is provided on the base, and the reaction force seat assembly includes a first state and a second state. In the first state, the reaction force seat assembly is fixed at the opening. In the second state, the reaction force seat assembly is away from the body and drives the fixed assembly to leave the test space through the opening. The reaction force seat assembly can slide along the extension direction of the slide rail so that the reaction force seat assembly can be converted between the first state and the second state.

7. The Hopkinson torsion bar high and low temperature test equipment according to claim 6, characterized in that: The reaction seat assembly includes a reaction seat and a fixed seat, the fixed seat is cylindrical, the first end of the fixed seat is arranged at the center of the side of the reaction seat facing the body, and the second end of the fixed seat is connected to the fixed assembly; The shape of the opening matches the fixing seat, and the fixing seat can be sealed to the opening.

8. The Hopkinson torsion bar high and low temperature test equipment according to claim 5, characterized in that: The fixing assembly includes a fixing rod, a fixing sleeve and a center block assembly. The first end of the fixing rod is connected to the reaction seat assembly. The end of the fixing rod facing away from the reaction seat assembly is provided with a sample bonding surface. The fixing sleeve is arranged around the sample bonding surface. The center block assembly is fixedly arranged at the center position of the sample bonding surface. There is a gap between the center block assembly and the inner side wall of the fixing sleeve to form the sample fixing groove. The inner circumferential surface of the fixing sleeve is provided with an annular strain gauge at a position where it contacts the first sample to be tested and the second sample to be tested.

9. The Hopkinson torsion bar high and low temperature test equipment according to claim 8, characterized in that: The fixed sleeve is provided with a connection port corresponding to the broken mud layer, the connection port penetrates the side wall of the fixed sleeve, and the connection port is used to connect to a water inlet system, and the water inlet system can introduce pressurized liquid into the broken mud layer through the connection port.

10. The Hopkinson torsion bar high and low temperature test equipment according to claim 8, characterized in that: The fixing assembly further comprises a temperature sensor, the temperature sensor comprising a sensor body and a connecting line connected to the sensor body, the sensor body being arranged at the intersection of the broken mud layer and the central block assembly; The fixing assembly also includes a temperature measuring channel, which passes through the fixing rod and the central block assembly in sequence, so that the connecting line can extend to the outside of the thermal insulation box through the temperature measuring channel.

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