A high-temperature loading experiment device

Abstract

The present application relates to experimental equipment technical field, specifically, it is high temperature loading experimental equipment, including, the pressure rod device can hold test piece and exert the force along the first direction to test piece, the confining pressure device includes confining pressure cylinder and pressurizing assembly, confining pressure cylinder is coaxial with pressure rod device Setting, pressurizing assembly can inject pressure medium to confining pressure chamber;The heating device includes heating coil, metal sleeve and current controller, the metal sleeve is arranged in the confining pressure chamber and is set in the heating part, the metal sleeve is provided with the communication hole, the heating coil is arranged around the metal sleeve, the heating coil is out of one end of the confining pressure cylinder and is connected with current controller, the heating coil includes conductive layer, and the current controller is connected with the conductive layer and can control the high-frequency current of the conductive layer, so that the heating coil can heat test piece.Such has solved the problem that it is difficult to simulate the rock environment under actual conditions in Hopkinson pressure bar experiment.

Description

Technical Field

[0001] This invention relates to the field of experimental equipment technology, and more specifically, to a high-temperature loading experimental device. Background Technology

[0002] With the increasing depletion of shallow surface resources, the exploration of deep rock engineering has become a research hotspot. Research mainly focuses on the impact of high temperatures on the properties of deep rocks, aiming to understand the thermal damage evolution mechanism of rocks under high temperatures and to make reasonable assessments of the safety and stability of underground rock engineering projects, such as ultra-deep well drilling, deep earth laboratories, nuclear waste disposal, and geothermal resource development. Under high temperatures, the physical and mechanical properties of rocks change significantly, such as the changes in parameters like porosity, uniaxial compressive strength, and elastic modulus with temperature. The research background of rock mechanical properties under high-temperature environments involves multiple aspects, including the safety and stability assessment of deep rock engineering, the changing laws of rock physical and mechanical properties, the failure mechanism of thermally damaged rocks, and the development and utilization of hot dry rock resources. These studies are of great significance for understanding and predicting the behavior of rocks under high-temperature environments.

[0003] Traditional methods for heating rock specimens mainly involve direct baking or heat treatment using a constant-temperature electric furnace. In practical applications, this method typically involves heating the specimen separately first, and then quickly placing the heated specimen into a confining pressure cylinder for loading before the experiment. This method results in slow heating and severe oxidation of the specimen surface. Furthermore, in existing equipment, heating and confining pressure are performed separately, failing to effectively couple heating and confining pressure experiments. Summary of the Invention

[0004] To address the challenge of simulating real-world rock environments in the Hopkinson bar test, this invention provides a high-temperature loading experimental apparatus, comprising: a bar device, a confining pressure device, and a heating device. The bar device extends along a first direction and can clamp the specimen and apply a force along the first direction. The confining pressure device includes a confining pressure cylinder and a pressurizing assembly. The confining pressure cylinder is coaxially arranged with the bar device and has a confining pressure cavity inside. Both ends of the bar device extend through the confining pressure cavity along the first direction. The pressurizing assembly injects a pressure medium into the confining pressure cavity. The portion of the bar device located within the confining pressure cavity is the heating section. The heating device includes a heating coil, a metal sleeve, and a current controller. The metal sleeve is located within the confining pressure cavity and fitted onto the heating section. A gap exists between the metal sleeve and the heating section. A connecting hole is provided on the metal sleeve. The heating coil surrounds the metal sleeve and extends through one end of the confining pressure cylinder, connecting to the current controller. The heating coil includes a conductive layer. The current controller is connected to the conductive layer and can control the high-frequency current flowing through the conductive layer, enabling the heating coil to heat the specimen.

[0005] In some embodiments, the heating device further includes a water circulator and a cooling cavity disposed within the heating coil. A conductive layer covers the cooling cavity, which extends along the extension direction of the heating coil. Both ends of the cooling cavity are connected to the water circulator, which is capable of introducing a cooling medium into the cooling cavity and driving the cooling medium to flow unidirectionally along the cooling cavity.

[0006] In some embodiments, the heating device further includes a heat exchanger connected to a cooling chamber, wherein a cooling medium can flow into the heat exchanger and the heat exchanger can reduce the temperature of the cooling medium.

[0007] In some embodiments, an insulating layer is provided outside the heating coil, the insulating layer covering the outer peripheral surface of the conductive layer, and the insulating layer is made of insulating material.

[0008] In some embodiments, the wall thickness t of the conductive layer is set as follows:

[0009]

[0010] Where I is the effective current, f is the chassis operating frequency, and σ cu ρ is the conductivity of the conductive layer material. cu ΔT represents the resistivity of the conductive layer material, and ΔT represents the temperature rise of the conductive layer.

[0011] In some embodiments, the flow rate Q of the cooling medium in the cooling chamber is set as follows:

[0012]

[0013] Where I is the effective current, f is the chassis operating frequency, and σ cu ρ is the conductivity of the conductive layer material. cu Let be the resistivity of the conductive layer material, ΔT be the temperature rise of the conductive layer, and c be the temperature at which the conductive layer rises. p ρ is the specific heat capacity of the cooling medium, d is the diameter of the cooling cavity, L is the length of the heating coil, and ρ is the specific heat capacity of the cooling medium. w This represents the density of the cooling medium.

[0014] In some embodiments, the high-temperature loading experimental device further includes a temperature probe, which is communicatively connected to a current controller. The temperature probe is fixed on a metal sleeve, and the detection end of the temperature probe passes through the side wall of the metal sleeve and is positioned close to the specimen.

[0015] In some embodiments, the heating power of the heating coil is controlled based on the temperature detected by the temperature probe, and the heating rate of the specimen is controlled to be 1℃ / min-3℃ / min.

[0016] In some embodiments, the confining cylinder includes a cylinder body and a cylinder cover, the cylinder body having an opening, the cylinder cover being capable of being sealed to the opening, and a metal sleeve being fixedly connected to the side of the cylinder cover facing the opening.

[0017] In some embodiments, multiple connecting holes are provided.

[0018] To address the problem of difficulty in simulating actual rock environments in the Hopkinson bar test, this invention has the following advantages:

[0019] In the above technical solution, the specimen is usually a rock sample. A pressure bar device can clamp the specimen and apply a predetermined force along its extension direction to simulate the stress situation of the rock. The metal sleeve in the heating device can be set around the specimen in the circumferential direction. Since the specimen itself is rock, it is a solid aggregate with a stable shape composed of one or more minerals and natural glass. It can receive heat but cannot generate heat. Therefore, by using the metal sleeve and the heating coil surrounding the metal sleeve, the principle of electromagnetic induction is used to generate a high-speed changing alternating magnetic field by making a high-frequency current flow through the coil. When the metal sleeve is placed in it, the metal sleeve itself will cut the alternating magnetic field lines and generate an alternating current (i.e., eddy current) inside it, thereby achieving the heating effect of the metal sleeve. The rock specimen is indirectly heated by heating the metal sleeve. By controlling the high-frequency current, the temperature can be precisely controlled. Furthermore, on the basis of the heated metal sleeve, the heated specimen can be uniformly heated. Meanwhile, the confining pressure device utilizes a confining pressure cylinder to accommodate the specimen, the heating element of the pressure rod device, and a metal sleeve. By injecting a pressure medium into the confining pressure chamber, the pressure medium can enter the space inside the metal sleeve through a connecting hole, thereby applying a pressure environment that simulates actual conditions to the specimen. This allows the specimen to be heated under pressure during the experiment, achieving coupling between heating and confining pressure. Furthermore, the pressure medium can expel the air around the specimen, preventing oxidation of the specimen surface during heating. No additional transfer or treatment of the specimen is required, avoiding heat loss during transfer, reducing operational difficulty, and improving experimental repeatability. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of a high-temperature loading experimental device according to one embodiment is shown;

[0021] Figure 2 A schematic cross-sectional view of the lateral portion of a high-temperature loading experimental device according to one embodiment is shown.

[0022] Figure 3 A schematic diagram of the structure of a metal sleeve according to one embodiment is shown;

[0023] Figure 4 It shows Figure 3 Schematic diagram of the middle section of the structure;

[0024] Figure 5 A cross-sectional view of a heating coil according to one embodiment is shown.

[0025] Reference numerals: 10-Specimen; 20-Pressure rod device; 21-Fixing rod; 22-Incident rod; 30-Containing pressure device; 31-Containing pressure cylinder; 311-Cylinder body; 312-Cylinder head; 313-Base; 40-Heating device; 41-Heating coil; 411-Conductive layer; 412-Insulating layer; 413-Cooling chamber; 42-Metal sleeve; 421-Connecting hole; 43-Current controller; 50-Temperature probe. Detailed Implementation

[0026] 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, and are not intended to imply any limitation on the scope of the disclosure.

[0027] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based 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 terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. 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 a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, 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 or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0028] This embodiment discloses a high-temperature loading experimental device, such as... Figure 1-5As shown, it may include: a pressure rod device 20, a confining pressure device 30, and a heating device 40. The pressure rod device 20 extends along a first direction and is capable of clamping the specimen and applying a force to the specimen along the first direction. The confining pressure device 30 includes a confining pressure cylinder 31 and a pressurizing assembly. The confining pressure cylinder 31 is coaxially arranged with the pressure rod device 20 and has a confining pressure cavity inside. Both ends of the pressure rod device 20 extend through the confining pressure cavity along the first direction. The pressurizing assembly is capable of injecting a pressure medium into the confining pressure cavity. The portion of the pressure rod device 20 disposed within the confining pressure cavity is a heating part. The heating device 40 includes: The heating coil 41, the metal sleeve 42, and the current controller 43 are arranged. The metal sleeve 42 is disposed in the confining cavity and sleeved on the heating part. There is a gap between the metal sleeve 42 and the heating part. The metal sleeve 42 is provided with a through hole 421. The heating coil 41 is arranged around the metal sleeve 42. The heating coil 41 extends through one end of the confining cylinder 31 and is connected to the current controller 43. The heating coil 41 includes a conductive layer 411. The current controller 43 is connected to the conductive layer 411 and can control the high-frequency current passed into the conductive layer 411 so that the heating coil 41 can heat the specimen 10.

[0029] In the above technical solution, the specimen is typically a rock sample. The pressure bar device 20 can clamp and apply a predetermined force along its extension direction to the specimen to simulate the stress conditions of the rock. The metal sleeve 42 in the heating device 40 can be arranged circumferentially around the specimen. Since the specimen itself is rock, a solid aggregate composed of one or more minerals and natural glass with a stable shape, it can receive heat but cannot generate heat. Therefore, the heating coil 41 surrounding the metal sleeve 42 is used to... Utilizing the principle of electromagnetic induction, a high-frequency current is passed through the heating coil 41 to generate a rapidly changing alternating magnetic field. When the metal sleeve 42 is placed inside, the metal sleeve 42 itself cuts the alternating magnetic field lines, generating an alternating current (i.e., eddy current) inside it, thereby achieving the heating effect on the metal sleeve 42. Heating the rock specimen 10 is indirectly achieved by heating the metal sleeve 42. By controlling the high-frequency current, the temperature can be precisely controlled. Furthermore, based on the heating of the metal sleeve 42, the heated specimen 10 can achieve a uniform heating effect. Meanwhile, the confining pressure cylinder 31 in the confining pressure device 30 can accommodate the specimen 10, the heating part of the pressure rod device 20, and the metal sleeve 42. By injecting a pressure medium into the confining pressure chamber, the pressure medium can enter the space inside the metal sleeve 42 through the connecting hole 421 provided on the metal sleeve 42, thereby applying a pressure environment that simulates the actual situation to the specimen 10. During the experiment, the specimen 10 can be heated under pressure, realizing the coupling of heating and confining pressure. On this basis, the pressure medium can expel the air around the specimen 10, preventing oxidation of the surface of the specimen 10 during the heating process. No additional transfer or treatment of the specimen 10 is required, which can avoid heat loss of the specimen 10 during the transfer process, reduce the difficulty of operation, and improve the repeatability of the experiment.

[0030] It should be noted that different experimental specimens 10 can be set for different experimental situations. There can be one or more specimens 10. For example, when conducting simulation experiments of friction between rocks, multiple specimens 10 can be included to simulate the friction between rocks. Specifically, the pressure rod device 20 can include a fixed rod 21 and an incident rod 22. The fixed rod 21 is fixedly set, and the incident rod 22 can be connected to the loading component. The loading component can drive the incident rod 22 to apply a force to the specimen 10 clamped between the incident rod 22 and the fixed rod 21. To prevent leakage of the pressure medium in the confining cavity, an oily sealing ring can be set at the position where the incident rod 22 and the fixed rod 21 pass through the confining cylinder 31. To prevent affecting the loading action of the incident rod 22, the oily sealing ring and the incident rod 22 can be fully lubricated to reduce the influence of friction. Hydraulic oil is typically chosen as the pressure medium injected into the confining pressure chamber. Additionally, a thermally conductive and high-temperature resistant protective film can be applied to the outside of the specimen 10. This film is made of a flexible material and can transmit the pressure applied within the confining pressure chamber. Simultaneously, the protective film prevents the hydraulic oil from corroding the specimen 10. A base 313 can be provided on the lower side of the confining pressure cylinder 31 to fix it in place.

[0031] In the above solution, compared with resistance heating, in order to achieve real-time high-temperature loading with thermo-coupling, the above technical solution sets the heating coil 41 inside the confining cylinder 31. The space required for the heating coil 41 inside the confining cylinder is much smaller than that of the traditional resistance heater, and it can withstand pressure. The traditional resistance heater is difficult to work in the high-temperature and high-pressure environment filled with hydraulic oil.

[0032] Because the heating coil 41 will experience a temperature increase due to the eddy current self-heating effect during the heating process, in order to prevent it from overheating and melting, ... Figure 2 as well as Figure 5 As shown, the heating device 40 also includes a water circulator and a cooling cavity 413 disposed in the heating coil 41. The conductive layer 411 covers the cooling cavity 413. The cooling cavity 413 extends along the extension direction of the heating coil 41. Both ends of the cooling cavity 413 are connected to the water circulator. The water circulator can introduce cooling medium into the cooling cavity 413 and drive the cooling medium to flow unidirectionally along the cooling cavity 413.

[0033] By forming a cooling chamber 413 inside the heating coil 41 for the flow of cooling medium, heat exchange is carried out between the flow of cooling medium and the heating coil 41. By raising the temperature of the cooling medium, heat is carried away, which can effectively prevent the heating coil 41 from overheating during operation.

[0034] To conserve cooling medium and reduce volume, a circulating cooling medium solution can be adopted. However, the temperature of the cooling medium will gradually rise during prolonged use, eventually leading to low or even stopped heat dissipation efficiency. To avoid this, the heating device 40 can be further equipped with a heat exchanger connected to the cooling chamber 413. The cooling medium can flow into the heat exchanger, which can lower the temperature of the cooling medium. Through the heat exchanger, the cooling medium flowing out of the cooling chamber 413 can exchange heat and be cooled, thus maintaining a highly efficient cooling effect.

[0035] As a specific implementation method, such as Figure 5 As shown, an insulating layer 412 is also provided outside the heating coil 41. The insulating layer 412 covers the outer peripheral surface of the conductive layer 411 and is made of insulating material.

[0036] Since the heating coil 41 needs to penetrate the side wall of the confining cylinder 31 and extend into the confining cavity, the insulating layer 412 covering the outer layer of the heating coil 41 prevents leakage when it comes into contact with the confining cylinder 31. For the part exposed outside the confining cylinder 31, the insulating layer 412 prevents electric shock caused by accidental contact by the operator. The insulating layer 412 also protects the inner conductive layer 411. The cooling cavity 413 and the conductive layer 411 can be optionally insulated. When not insulated, the cooling cavity 413 is a closed environment, and the cooling medium flows inside the cooling cavity 413, isolating it from the external environment. The outer surface of the conductive layer 411 is covered with the insulating layer 412, ensuring complete isolation between the conductive layer 411 and the external environment. Even if current is conducted through the conductive layer 411 to the cooling medium, because the cooling water circuit is a closed circulation system and the entire water circuit equipment is grounded, no external leakage path will be formed.

[0037] Specifically, the wall thickness t of the conductive layer 411 is set as follows:

[0038]

[0039] Where I is the effective current, f is the chassis operating frequency, and σ cu The conductivity of the conductive layer 411 material is ρ. cu ΔT represents the resistivity of the conductive layer 411 material, and ΔT represents the temperature rise of the conductive layer 411.

[0040] As a relatively simple implementation method, considering both economy and safety, the copper tube wall thickness should be 0.7mm ≤ t ≤ 1mm. The metal sleeve 42 thickness δ should meet the requirement of 3mm ≤ δ ≤ 4mm to avoid local burn-through caused by an excessively thin sleeve wall, or thermal stress damage caused by a large internal and external temperature gradient due to an excessively thick sleeve wall.

[0041] In addition, to achieve a better cooling effect, the flow rate Q of the cooling medium in the cooling chamber 413 is set as follows:

[0042]

[0043] Where I is the effective current, f is the chassis operating frequency, and σ cu The conductivity of the conductive layer 411 material is ρ. cu Here, ΔT represents the resistivity of the conductive layer 411 material, and ΔT represents the temperature rise of the conductive layer 411. p ρ is the specific heat capacity of the cooling medium, d is the diameter of the cooling cavity 413, L is the length of the heating coil 41, and ρ is the specific heat capacity of the cooling medium. w This represents the density of the cooling medium.

[0044] As one implementation method, considering the typical volume of experimental equipment and the space and feasibility within the metal sleeve 42, the diameter of the cooling chamber 413 can be set to 6mm. In this case, the flow rate Q of the cooling medium must be greater than 10L / min, and the flow velocity of the cooling medium should be greater than or equal to 2m / s. Naturally, the faster the flow velocity, the greater the heat transfer coefficient and the better the cooling effect.

[0045] To better control the heating of specimen 10, such as Figure 2 As shown, the high-temperature loading experimental device also includes a temperature probe 50, which is connected to the current controller 43. The temperature probe 50 is fixed on the metal sleeve 42, and the detection end of the temperature probe 50 passes through the side wall of the metal sleeve 42 and is set close to the specimen 10.

[0046] In this embodiment, the temperature probe 50 can be an insulated (non-contact) probe, which extends into the metal sleeve 42 near the center of the specimen 10. The contact area between the temperature probe 50 and the inner wall of the metal sleeve 42 needs to be treated with a high-temperature resistant insulating material to prevent affecting the measurement accuracy or damaging the probe. Specifically, the temperature probe 50 can monitor temperature changes in real time and transmit the collected data to the current controller 43. The current controller 43 can automatically adjust the heating power of the electromagnetic induction heating device 40 casing 5 according to the preset heating program and target temperature.

[0047] As a method of using the aforementioned high-temperature loading experimental equipment, in the initial stage, a lower heating power is used for preheating to ensure uniform heating of the rock specimen 10 and avoid internal stress concentration due to excessive temperature differences. As the temperature rises,

[0048] Based on the temperature detected by the temperature probe 50, the heating power of the heating coil 41 is controlled, and the heating rate of the specimen 10 is controlled to be 1℃ / min-3℃ / min. Preferably, the heating rate can be selected as 2℃ / min to ensure that the specimen 10 is heated uniformly. When the target temperature is reached, the heating power is automatically adjusted to ensure that the temperature is stable within the target range. In actual use, after the specimen 10 is installed in the experimental device, the pressure medium is first injected into the confining chamber, and the pressure medium can flow into the internal space of the metal sleeve 42 through the connecting hole 421 provided on the metal sleeve 42, so that it wraps the specimen 10. Then the heating device 40 is started to heat, and the heating rate is adjusted based on the temperature monitoring of the temperature probe 50.

[0049] By optimizing the above heating strategies, heating accuracy and experimental efficiency can be effectively improved, simulating the high-temperature environment of deep rocks. After creating a high-temperature environment for specimen 10, the specimen 10 is loaded using the confining pressure cylinder 31, thereby completing the mechanical response test of rocks under high-temperature conditions in deep rock engineering. This device creates a high-temperature environment for specimen 10 within the confining pressure cylinder 31 through electromagnetic induction heating, achieving thermo-mechanical coupling to more effectively simulate the relatively realistic state of rocks in deep rock engineering under high-temperature conditions.

[0050] To ensure that the metal sleeve 42 and the specimen 10 are coaxially positioned and do not contact each other, specifically, as follows: Figure 2 As shown, the confining cylinder 31 includes a cylinder body 311 and a cylinder cover 312. The cylinder body 311 has an opening, and the cylinder cover 312 is sealed to the opening. A metal sleeve 42 is fixedly connected to the side of the cylinder cover 312 facing the opening.

[0051] The confining cylinder 31 is used to fix the metal sleeve 42 to it. When the cylinder body 311 and cylinder cover 312 of the confining cylinder 31 are closed, the metal sleeve 42 can be stably fixed and ensured to surround the specimen 10. The cylinder body 311 and cylinder cover 312 can be connected by fixing bolts to prevent the cylinder body 311 and cylinder cover 312 from separating under the action of pressure medium during use. A base 313 can also be provided to support and fix the confining cylinder 31.

[0052] In order to ensure that the pressure medium can flow fully into the metal sleeve 42, such as Figure 3-4 As shown, multiple connecting holes 421 are provided. Among them, the connecting holes 421 can be provided on the upper side of the metal sleeve 42 to prevent the formation of cavities inside the metal sleeve 42.

[0053] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A high-temperature loading experimental apparatus, characterized in that, The high-temperature loading experimental equipment includes: Compression rod device, confining pressure device, and heating device. The pressure bar device extends along a first direction and is capable of clamping the specimen and applying a force along the first direction to the specimen. The confining pressure device includes a confining pressure cylinder and a pressurizing assembly. The confining pressure cylinder is coaxially arranged with the pressure bar device. A confining pressure cavity is provided inside the confining pressure cylinder. The two ends of the pressure bar device along the first direction respectively pass through the confining pressure cavity. The pressurizing assembly is capable of injecting a pressure medium into the confining pressure cavity. The part of the pressure bar device disposed in the confining pressure cavity is a heating part. The heating device includes a heating coil, a metal sleeve, and a current controller. The metal sleeve is disposed inside the confining pressure cavity and fitted onto the heating part. A gap is provided between the metal sleeve and the heating part. A through hole is provided on the metal sleeve. The heating coil is disposed around the metal sleeve. The heating coil extends through one end of the confining pressure cylinder and is connected to the current controller. The heating coil includes a conductive layer. The current controller is connected to the conductive layer and can control the high-frequency current flowing into the conductive layer, so that the heating coil can heat the specimen. The heating device further includes a water circulator and a cooling cavity disposed within the heating coil. The conductive layer covers the cooling cavity, which extends along the extension direction of the heating coil. Both ends of the cooling cavity are connected to the water circulator. The water circulator can introduce a cooling medium into the cooling cavity and drive the cooling medium to flow unidirectionally along the cooling cavity. The wall thickness t of the conductive layer is set as follows: ； Where I is the effective current and f is the chassis operating frequency. The conductivity of the material of the conductive layer is given by [insert value here]. The resistivity of the material of the conductive layer is given by [insert value here]. The temperature at which the conductive layer is raised; The flow rate Q of the cooling medium in the cooling chamber is set as follows: ； Where I is the effective current and f is the chassis operating frequency. The conductivity of the material of the conductive layer is given by [insert value here]. The resistivity of the material of the conductive layer is given by [insert value here]. The temperature at which the conductive layer is raised. d is the specific heat capacity of the cooling medium, d is the diameter of the cooling cavity, and L is the length of the heating coil. The density of the cooling medium is given.

2. The high-temperature loading experimental device according to claim 1, characterized in that, The heating device also includes a heat exchanger connected to the cooling chamber, wherein the cooling medium can flow into the heat exchanger and the heat exchanger can reduce the temperature of the cooling medium.

3. The high-temperature loading experimental apparatus according to claim 1, characterized in that, An insulating layer is also provided outside the heating coil. The insulating layer covers the outer peripheral surface of the conductive layer and is made of insulating material.

4. The high-temperature loading experimental device according to claim 1, characterized in that, The high-temperature loading experimental device also includes a temperature probe, which is communicatively connected to the current controller. The temperature probe is fixed on the metal sleeve, and the detection end of the temperature probe passes through the side wall of the metal sleeve and is positioned close to the specimen.

5. The high-temperature loading experimental apparatus according to claim 4, characterized in that, Based on the temperature detected by the temperature probe, the heating power of the heating coil is controlled, and the heating rate of the specimen is controlled to be 1℃ / min-3℃ / min.

6. The high-temperature loading experimental apparatus according to claim 1, characterized in that, The confining cylinder includes a cylinder body and a cylinder cover. The cylinder body has an opening, and the cylinder cover is capable of being sealed to the opening. The metal sleeve is fixedly connected to the side of the cylinder cover facing the opening.

7. The high-temperature loading experimental apparatus according to claim 1, characterized in that, Multiple connecting holes are provided.

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