Implantable multiple transient high strain rate dynamic load application device and method

Abstract

The present invention relates to an implantable multiple-time transient high-strain-rate dynamic load application device and method, comprising a limiting cylinder, wherein a plurality of loading units are arranged in the limiting cylinder, wherein the loading unit comprises a cylinder body, wherein a conductive impact rod and a kinetic energy impact rod are coaxially arranged in the cylinder body, the external end face of the reaction end of the transmission impact rod extending out of the cylinder body contacts the external end face of the loading end of the kinetic energy impact rod extending out of the cylinder body to provide a reaction force, the conductive impact rod and the kinetic energy impact rod are both provided with a piston to divide the space in the cylinder body into an energy storage chamber, an expansion chamber and a return chamber arranged in sequence from the reaction end to the loading end, a heating element is provided in the expansion chamber, and an air release element is provided on the cylinder wall of the cylinder body, and the air release element is located at a set position on the cylinder wall so that the air release element can be connected to the expansion chamber after the expansion chamber is expanded. By adopting the device of the present invention, transient application of high strain rate dynamic load in a very small test space is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of rock mechanics testing equipment, and in particular to an implantable multiple transient high strain rate dynamic load application device and method. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In deep underground projects, rock masses are frequently subjected to dynamic disturbances, such as tectonic movements, tunnel excavation and support, periodic roof pressure, compression from blasting stress waves, and support lifting and lowering. Unlike shallower depths, the deep environment is more complex, and the dynamic loads to which deep rock masses are subjected are often cyclical, high-strain-rate dynamic loads. Physical model testing, by establishing a model structure corresponding to the prototype structure and recreating the dynamic disturbance process under laboratory conditions, allows for in-depth study of the mechanical characteristics of the surrounding rock under repeated high-strain-rate disturbance loads, which is of great significance for guiding underground engineering practice.

[0004] In deep underground engineering model tests, to ensure the test results, disturbance load simulation has the following requirements: (1) The method is safe and reliable and complies with laboratory safety management requirements; (2) The dynamic load energy is large to achieve high strain rate loading of the model; (3) Multiple dynamic loadings can be performed continuously to accurately simulate the on-site disturbance process; (4) The loading space is small to save experimental space and facilitate safety protection.

[0005] Patent application number 202011467117.2 discloses a multifunctional rock mechanics testing system and method for full-strain rate dynamic and static combined loading. The device can realize multi-strain rate dynamic and static combined loading under multi-physical field surrounding rock conditions, but it applies dynamic loads through the impact rod lifting mechanism and the impact rod, and has the limitations of low dynamic loading frequency and large loading space. Due to its low energy, it is difficult to achieve high strain rate loading.

[0006] In summary, existing devices are unable to achieve multiple transient high strain rate dynamic load application on specimens in a very small space. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an implantable multiple transient high strain rate dynamic load application device and method, which can use the rapid change of gas pressure in the loading device cavity to achieve transient high strain rate dynamic load loading on the test model while applying static load.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] In a first aspect, an embodiment of the present invention provides an implantable multiple transient high strain rate dynamic load application device, comprising a limiting cylinder, wherein a plurality of loading units are disposed within the limiting cylinder, wherein the loading units comprise a cylinder body, wherein a conductive impact rod and a kinetic energy impact rod are coaxially disposed within the cylinder body, wherein an external end face of the reaction end of the transmission impact rod extending from the cylinder body contacts an external end face of the kinetic energy impact rod extending from the loading end of the cylinder body to provide a reaction force, wherein both the conductive impact rod and the kinetic energy impact rod are provided with a piston to divide the space within the cylinder body into an energy storage chamber, an expansion chamber, and a return chamber sequentially disposed from the reaction end to the loading end, wherein a heating element is disposed within the expansion chamber, and an air release element is disposed on the cylinder wall, wherein the air release element is located at a set position on the cylinder wall so that the air release element can communicate with the expansion chamber after the expansion chamber is expanded;

[0010] The heating element can heat the liquid carbon dioxide introduced into the expansion chamber so that the expansion chamber can expand to overcome the medium pressure in the return chamber, and then drive the kinetic energy impact rod to apply load under the reaction force of the transmission impact rod.

[0011] Optionally, the air outlet end of the air leaking member is communicated with a ventilation channel provided in the limiting cylinder.

[0012] Optionally, a first air inlet is provided on the side of the air-deflating member close to the reaction end of the cylinder body. The first air inlet is connected to the air outlet channel inside the air-deflating member through an annular channel provided in the air-deflating member. The air outlet channel is provided along the radial direction of the cylinder body. The inner end of the air outlet channel serves as the second air inlet, and the outer end of the air outlet channel serves as the air outlet. The area of ​​the first air inlet is smaller than the area of ​​the second air inlet.

[0013] Optionally, sealing rings are provided between the pistons of the transmission impact rod and the kinetic energy impact rod and the inner side surfaces of the cylinder body.

[0014] Optionally, inlets are provided on the cylinder walls corresponding to the energy storage chamber, the expansion chamber and the return chamber, and one-way valves are provided at the inlets.

[0015] Optionally, a limiting platform is provided on the inner side surface of the cylinder wall corresponding to the expansion chamber.

[0016] Optionally, sealing rings are provided between the transmission impact rod and the kinetic energy impact rod and the cylinder body.

[0017] Optionally, the limiting cylinder includes a cylinder body, one end of which is detachably provided with a reaction force installation cover for contacting the end of the conductive impact rod of the loading unit extending outside the reaction force end of the cylinder body, and the other end of the cylinder body is detachably provided with a bottom cover, the bottom cover being provided with an opening for the end of the kinetic energy impact rod of the loading unit extending outside the loading end of the cylinder body to pass through.

[0018] In the second aspect, an embodiment of the present invention provides a method for an implantable multiple transient high strain rate dynamic and static application device as described in the first aspect, wherein a medium of set pressure is injected into the energy storage chamber and the return chamber, and liquid carbon dioxide is injected into the expansion chamber, wherein the pressure of the liquid carbon dioxide is less than the set pressure, the heating element works, the liquid carbon dioxide is gasified, and under the action of the reaction force of the conductive impact rod, the expansion of the expansion chamber drives the kinetic energy impact rod to overcome the pressure movement of the medium in the return chamber and apply an impact load. When the expansion chamber expands to connect with the deflation element, the carbon dioxide gas in the expansion chamber is released, and under the action of the medium pressure in the return chamber, the kinetic energy impact rod is reset.

[0019] Optionally, the medium is nitrogen.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The dynamic load application device of the present invention has an expansion chamber, a return chamber and an energy storage chamber in the cylinder body. Liquid carbon dioxide can be introduced into the expansion chamber. The expansion chamber is provided with a heating element, which can heat the liquid carbon dioxide, causing it to rapidly vaporize and expand, thereby driving the kinetic energy impact rod to move under the reaction force of the conductive impact rod to apply an impact load. The liquid carbon dioxide blasting technology is applied to the application of high strain rate dynamic load. Compared with the use of an impact rod lifting mechanism and an impact rod to apply dynamic load, the kinetic energy impact rod has greater energy and a smaller movement space for the kinetic energy impact rod, thereby realizing the transient application of high strain rate dynamic load in a very small test space.

[0022] 2. When the dynamic load applying device of the present invention has multiple loading units in the limiting cylinder, high strain rate and multiple high frequency transient impact loading can be achieved by controlling the different action times and time intervals of the heating element.

[0023] 3. The dynamic load applying device of the present invention has a limiting cylinder on the outside. The limiting cylinder is a columnar structure and can be directly implanted in the gas-liquid composite fast following cylinder, thereby realizing the coupled loading of high strain rate dynamic load and static load.

[0024] 4. The dynamic load applying device of the present invention has an air release member with a first air inlet and a second air inlet. The area of ​​the second air inlet is larger than that of the first air inlet. After the expansion chamber expands, air is first taken in through the first air inlet. The gas entering the first air inlet is adsorbed on the surface of the air outlet channel, forming a low-pressure area in the air outlet channel. When the expansion chamber further expands, allowing the second air inlet to take in air, the airflow from the first air inlet and the airflow from the second air inlet merge to form a high-speed, high-capacity airflow discharge, thereby achieving rapid pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0027] Figure 2 This is a schematic cross-sectional view of a limiting cylinder according to embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the loading unit in Example 1 of the present invention;

[0029] Figure 4 This invention Figure 3 A local enlarged view of point A in FIG;

[0030] Figure 5 This is a schematic structural diagram of the air release member in accordance with embodiment 1 of the present invention;

[0031] Figure 6 This is a schematic diagram of the deflation principle of the deflation member in embodiment 1 of the present invention;

[0032] Figure 7 This is a schematic diagram of the working process of Example 2 of the present invention;

[0033] Figure 8 This is a schematic diagram of the assembly of the dynamic load applying device and the gas-liquid composite fast following cylinder in Example 2 of the present invention;

[0034] Among them, 1. Cylinder body, 2. Limiting platform, 3. Deflation part, 4. Cylinder body, 5. Ventilation channel, 6. First inlet, 7. Second inlet, 8. Third inlet, 9. Bottom cover, 10. Loading plate, 11. Reaction force installation cover, 12. Transmission impact rod, 13. Energy storage chamber, 14. Expansion chamber, 15. Heater, 16. Kinetic energy impact rod, 17. Return chamber, 18. Sealing ring, 19. Gas-liquid composite fast following cylinder, 20. Connecting channel. DETAILED DESCRIPTION

[0035] For the convenience of description, if the words "upper" and "lower" appear in the present invention, they only indicate that they are consistent with the upper and lower directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0036] In this embodiment, high strain rate dynamic load means that the strain rate of the dynamic load is higher than the strain rate of the dynamic load in the patent application number 202011467117.2, and there is no specific restriction on the size of the strain rate.

[0037] Example 1

[0038] This embodiment provides an implantable multiple transient high strain rate dynamic load application device, such as Figure 1 As shown, including the limiting cylinder, such as Figure 2 As shown, the limiting cylinder adopts a cylindrical structure, including a cylinder 4, one end of the cylinder 4 is detachably connected to a reaction force installation cover 11, which is used as a reaction force end. Preferably, the reaction force installation cover 11 is detachably fixedly connected to the cylinder 4 by bolts to provide a reaction force for the load applied to the loading unit inside it, and the other end is detachably provided with a bottom cover 9, and an opening is provided in the center of the bottom cover 9. Preferably, the bottom cover 9 is detachably fixedly connected to the cylinder 4 by bolts.

[0039] The reaction force adding cover 11 and the bottom cover 9 are both fixed to the cylinder 4 in a detachable connection manner, so as to facilitate the insertion of the loading unit into the cylinder 4 .

[0040] The limiting cylinder is provided with multiple loading units, which are used to limit the loading units installed therein. In this embodiment, the limiting cylinder is provided with two loading units, which have identical structures and are arranged along the axis of the limiting cylinder. The loading unit closest to the reaction force cover is the first loading unit, and the other loading unit is the second loading unit.

[0041] like Figure 3 As shown, the loading unit includes a cylinder body 1, one end of the cylinder body 1 close to the reaction force cover 11 is the reaction end, and the other end is the loading end. The cylinder body 1 is a sealing structure, and the cylinder body 1 is placed inside the limiting cylinder. The cylinder body 1 and the limiting cylinder are coaxially arranged. A transmission impact rod 12 and a kinetic energy impact rod 16 are arranged in the cylinder body 1. The transmission impact rod 12 and the kinetic energy impact rod 16 are coaxially arranged, and the transmission impact rod 12 is arranged close to the reaction force end of the limiting cylinder.

[0042] In this embodiment, in the first loading unit near the reaction end of the limiting cylinder, the upper end of the transmission impact rod 12 extends to the outside of the cylinder body 1 and contacts the reaction force installation cover 11, and the lower end of the kinetic energy impact rod 16 extends to the outside of the cylinder body 1 and contacts the upper end of the transmission impact rod 12 of the second loading unit. In the second loading unit near the bottom cover 9 of the limiting cylinder, the upper end of the transmission impact rod 12 extends to the outside of the cylinder body 1 and contacts the lower end of the kinetic energy impact rod 16 of the first loading unit, and the lower end of the kinetic energy impact rod 16 extends to the outside of the bottom cover 9 through the opening in the center of the bottom cover 9 for applying load.

[0043] Among them, sealing rings 18 are provided between the transmission impact rod 12 and the kinetic energy impact rod 16 of the two loading units and the cylinder body 1 to prevent gas leakage in the cylinder body 1.

[0044] The rod sections of the transmission impact rod 12 and the kinetic energy impact rod 16 located in the cylinder body are both provided with a portion with a larger diameter to form a piston, and a sealing ring is provided between the piston and the inner side surface of the cylinder body 1.

[0045] Therefore, the pistons of the transmission impact rod 12 and the kinetic energy impact rod 16 divide the space inside the cylinder 1 into an energy storage chamber 13, an expansion chamber 14 and a return chamber 17. The energy storage chamber 13, the expansion chamber 14 and the return chamber 17 are arranged in sequence along the direction from the reaction end to the loading end.

[0046] The cylinder wall areas corresponding to the energy storage chamber 13, the expansion chamber 14 and the return chamber 17 are all provided with inlets, the energy storage chamber 13 corresponds to the first inlet 6, the expansion chamber 14 corresponds to the second inlet 7, and the return chamber 17 corresponds to the third inlet 8. A one-way valve is provided at the inlet, and the inlets of the energy storage chamber 13 and the return chamber 17 are used to introduce a medium into the energy storage chamber 13 and the return chamber 17. Preferably, the medium is nitrogen, and the one-way valve allows nitrogen to flow only from the outside of the cylinder 1 into the energy storage chamber 13 and the return chamber 17 without backflow. The inlet of the expansion chamber 14 is used to introduce liquid carbon dioxide into the expansion chamber 14, and the one-way valve allows liquid carbon dioxide to enter the expansion chamber 14 only from the outside of the cylinder 1 without backflow.

[0047] like Figure 4-Figure 6 As shown, a gas relief member 3 is provided in the cylinder wall of the cylinder body 1, and the axis of the gas relief member 3 is arranged along the radial direction of the cylinder body. An air outlet channel coaxial with the gas relief member 3 is provided inside the gas relief member 3, and the air outlet channel includes a conical first channel portion and a second channel portion. The ends of the first channel portion and the second channel portion with smaller areas are connected, the end with a larger area of ​​the first channel portion is arranged toward the space inside the cylinder body, and the end with a larger area of ​​the second channel portion is arranged toward the cylinder body 4 of the limiting cylinder. A ventilation channel 5 is opened on the inner surface of the cylinder body 4, and the ventilation channel 5 is arranged along the axial direction of the cylinder body 4, and the top end of the ventilation channel 5 extends to the cylinder body 4 to install the reaction force installation cover 1 1, the air outlet end of the second channel portion is connected to the ventilation channel 5, and the end of the first channel portion facing the space inside the cylinder body serves as a second air inlet. The first air inlet is also provided on the side of the air-deflating member 3 close to the reaction end. The first air inlet is connected to one end of the connecting channel 20, and the other end of the connecting channel extends to the inner side of the cylinder body 1. The first air inlet is arranged perpendicular to the axial direction of the air outlet channel, and the first air inlet is connected to the annular channel provided by the air-deflating member. The annular channel is connected to the second channel portion, and an annular guide portion is provided between the annular channel and the second channel portion for guiding the airflow entering from the first air inlet.

[0048] An area of ​​the second air inlet is larger than an area of ​​the first air inlet.

[0049] In this embodiment, the air-deflation component 3 is arranged at a set position between the corresponding inlets of the expansion chamber 14 and the return chamber 17, so that after the expansion chamber expands due to the heating and vaporization of the liquid carbon dioxide in the expansion chamber, the first air inlet and the second air inlet of the air-deflation component 3 can be connected to the expansion chamber, thereby deflation of the gaseous carbon dioxide in the expansion chamber.

[0050] A limit platform 2 is provided on the inner side surface of the cylinder body corresponding to the expansion chamber. The limit platform 2 adopts an annular structure. The limit platform 2 is provided between the deflation component 3 and the inlet of the expansion chamber 14, and is used to limit the return movement of the kinetic energy impact rod 16 under the action of the nitrogen pressure in the return chamber 17 after the expansion chamber 14 is deflated.

[0051] The inner ring surface of the limiting platform 2 is provided with a heating element, and the heating element can be an existing heater 15, which will not be described in detail here. It can be understood that the heating element can also be provided on the inner side surface of the cylinder body.

[0052] The heating element can heat the liquid carbon dioxide in the expansion chamber to gasify it.

[0053] The dynamic load applying device of this embodiment has a simple structure, high transmission efficiency, and is easy to manufacture and maintain.

[0054] Example 2

[0055] This embodiment provides a method for applying a transient high strain rate dynamic load to the implantable device described in embodiment 1, such as Figure 7 As shown, the following steps are included:

[0056] Arrange the test site, check the device components and confirm whether each component is in working condition, and make preparations for the test;

[0057] In the two loading units, a medium of set pressure is introduced into the energy storage chamber 13 and the return chamber 17 through the inlet and the one-way valve. In this embodiment, nitrogen can be used as the medium. Liquid carbon dioxide is introduced into the expansion chamber 14 through the inlet and the one-way valve. The pressure of the liquid carbon dioxide is lower than that of nitrogen, which can limit the position of the kinetic energy impact rod before dynamic load loading.

[0058] Place two loading units into the cylinder body 4 of the limiting cylinder, the two loading units are the first loading unit and the second loading unit respectively, and then install the reaction force installation cover 11 and the bottom cover 9 at both ends of the limiting cylinder, wherein the end of the transmission impact rod 12 of the first loading unit close to the reaction force installation cover 11 contacts the reaction force installation cover 11, and the end of the kinetic energy impact rod 16 contacts the end of the transmission impact rod 12 of the second loading unit, and the end of the kinetic energy impact rod 16 of the second loading unit extends to the outside of the bottom cover 9.

[0059] The limiting cylinder is implanted into the interior of the gas-liquid composite fast following oil cylinder 19 or other loading supporting equipment.

[0060] The heating element of the second loading unit is controlled to heat the liquid carbon dioxide, causing the liquid carbon dioxide in the expansion chamber to quickly gasify and expand rapidly to generate a high-pressure shock wave. The original equilibrium state is broken, and the kinetic energy impact rod 16 is subjected to a geometric equivalent shock wave to overcome the nitrogen pressure in the return chamber 17 and is rapidly propelled outward under the reaction force of the transmission impact rod 12, generating an impact load applied to the loading plate 10. The loading plate 10 is in direct contact with the loaded object, and the kinetic energy impact rod 16 applies a dynamic load to the object through the loading plate 10.

[0061] When the expansion chamber 14 expands to be connected with the first air inlet, the carbon dioxide gas in the expansion chamber 14 enters the annular channel through the first air inlet, and then enters the air outlet channel to form a primary airflow. The primary airflow is adsorbed on the surface of the air outlet channel, and a low-pressure area is generated in the center of the air outlet channel. At this time, the gas flow is relatively small. When the expansion chamber 14 continues to expand, the second air inlet is connected with the expansion chamber 14. Since the area of ​​the second air inlet is larger, a large amount of gas in the expansion chamber 14 is sucked into the air outlet channel through the second air inlet. The formed airflow merges with the primary airflow to form a high-speed, high-capacity airflow, which enters the ventilation channel 5 of the cylinder through the air outlet channel and is then discharged, so that the expansion chamber 14 reaches a lower gas pressure in a shorter time, thereby achieving the purpose of rapid pressure relief.

[0062] Before the kinetic energy impact rod of the second loading unit returns to its position, the heating element of the first loading unit is controlled to work, and the same method is used to push the kinetic energy impact rod 16 of the first loading unit outward to apply a load to the transmission impact rod 12 of the second loading unit. The transmission impact rod 12 of the second loading unit transfers the load to the kinetic energy impact rod 16, and then the kinetic energy impact rod 16 is used to apply a second load to the loading plate 10.

[0063] In this embodiment, the first loading unit and the second loading unit do not affect each other when applying dynamic loads, thereby achieving the application of high strain rate dynamic loads on both sides and ensuring the safety and controllability of the test process.

[0064] The kinetic energy impact rod 16 of the first loading unit is reset under the action of the nitrogen in the return chamber 17 , and correspondingly, the kinetic energy impact rod 16 of the second loading unit is reset under the action of the nitrogen in the return chamber 17 .

[0065] The dynamic load application device and method of this embodiment apply liquid carbon dioxide blasting technology to high strain rate dynamic load application. Compared with the dynamic load application through the impact rod lifting mechanism and the impact rod, the kinetic energy impact rod has large energy and a small movement space of the kinetic energy impact rod, which realizes the transient application of high strain rate dynamic load in an extremely small test space. Moreover, by setting the number of loading units and controlling the working time interval of the heating element of each loading unit, multiple high strain rate dynamic loads can be applied at a high frequency.

[0066] In this embodiment, Figure 8As shown, since the limit cylinder adopts a cylindrical structure, it can cooperate with the gas-liquid composite fast following cylinder to realize the coupled loading of multiple high strain rate dynamic loads and static loads on the test model. The gas-liquid composite fast following cylinder can adopt the gas-liquid composite fast following cylinder disclosed in patent CN112697615B, and its specific structure will not be described in detail here.

[0067] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for implanting a multiple transient high strain rate dynamic load application device, characterized in that: The implantable multiple transient high strain rate dynamic load application device includes a limiting cylinder, a plurality of loading units are arranged in the limiting cylinder, and the loading units include a cylinder body, a conductive impact rod and a kinetic energy impact rod are coaxially arranged in the cylinder body, the external end surface of the reaction end of the transmission impact rod extending out of the cylinder body contacts the external end surface of the kinetic energy impact rod extending out of the loading end of the cylinder body to provide a reaction force, the conductive impact rod and the kinetic energy impact rod are both provided with a piston to divide the space in the cylinder body into an energy storage chamber, an expansion chamber and a return chamber arranged in sequence from the reaction end to the loading end, a heating element is provided in the expansion chamber, and an air release element is provided on the cylinder wall of the cylinder body, and the air release element is located at a set position on the cylinder wall so that the air release element can communicate with the expansion chamber after the expansion chamber is expanded; Place two loading units into the cylinder body of the limiting cylinder, the two loading units being the first loading unit and the second loading unit respectively; A first air inlet is provided on one side of the air release member close to the reaction end of the cylinder body. The first air inlet is connected to an air outlet channel inside the air release member through an annular channel provided on the air release member. The air outlet channel is provided along the radial direction of the cylinder body. The inner end of the air outlet channel serves as the second air inlet, and the outer end of the air outlet channel serves as the air outlet. The area of ​​the first air inlet is smaller than that of the second air inlet. The heating element is capable of heating the liquid carbon dioxide introduced into the expansion chamber so that the expansion chamber expands to overcome the pressure of the medium in the return chamber, thereby driving the kinetic energy impact rod to apply a load under the reaction force of the transmission impact rod; The heating element of the second loading unit is controlled to heat the liquid carbon dioxide, causing the liquid carbon dioxide in the expansion chamber to quickly gasify and expand rapidly to generate a high-pressure shock wave. The original equilibrium state is broken, and the kinetic energy impact rod is subjected to a geometric equivalent shock wave, overcoming the nitrogen pressure in the return chamber and rapidly propelling outward under the reaction force of the transmission impact rod, generating an impact load that is applied to the loading plate. The loading plate is in direct contact with the loaded object, and the kinetic energy impact rod applies a dynamic load to the object through the loading plate. Before the kinetic energy impact rod of the second loading unit returns to its position, the heating element of the first loading unit is controlled to work, and the same method is used to push the kinetic energy impact rod of the first loading unit outward to apply a load to the transmission impact rod of the second loading unit. The transmission impact rod of the second loading unit transfers the load to the kinetic energy impact rod, and then the kinetic energy impact rod is used to apply a second load to the loading plate.

2. The method of implanting a multiple transient high strain rate dynamic load application device according to claim 1, characterized in that: The air outlet end of the air-deflating member is communicated with a vent channel arranged in the limiting cylinder.

3. The method of implanting a multiple transient high strain rate dynamic load application device according to claim 1, characterized in that: Sealing rings are provided between the pistons of the transmission impact rod and the kinetic energy impact rod and the inner side surfaces of the cylinder body.

4. The method of implanting a multiple transient high strain rate dynamic load application device according to claim 1, characterized in that: Inlets are provided on the cylinder walls corresponding to the energy storage chamber, the expansion chamber and the return chamber, and a one-way valve is provided at the inlet.

5. The method of implanting a multiple transient high strain rate dynamic load application device according to claim 1, characterized in that: A limiting platform is provided on the inner side surface of the cylinder wall corresponding to the expansion chamber.

6. The method of implanting a multiple transient high strain rate dynamic load application device according to claim 1, characterized in that: Sealing rings are provided between the transmission impact rod, the kinetic energy impact rod and the cylinder body.

7. The method of implanting a multiple transient high strain rate dynamic load application device according to claim 1, characterized in that: The limiting cylinder includes a cylinder body, one end of which is provided with a reaction force mounting cover for contacting the end of the conductive impact rod of the loading unit extending outside the reaction force end of the cylinder body, and the other end of the cylinder body is provided with a bottom cover, which is provided with an opening for the end of the kinetic energy impact rod of the loading unit extending outside the loading end of the cylinder body to pass through.

8. The method of implanting a multiple transient high strain rate dynamic load application device as claimed in claim 1, characterized in that: A medium with a set pressure is injected into the energy storage chamber and the return chamber, and liquid carbon dioxide is injected into the expansion chamber, where the pressure of the liquid carbon dioxide is lower than the set pressure. The heating element works and the liquid carbon dioxide gasifies. Under the action of the reaction force of the conductive impact rod, the expansion of the expansion chamber drives the kinetic energy impact rod to overcome the pressure of the medium in the return chamber and move, applying an impact load. When the expansion chamber expands to connect with the deflation element, the carbon dioxide gas in the expansion chamber is released, and under the action of the medium pressure in the return chamber, the kinetic energy impact rod is reset.

9. The method of implanting a multiple transient high strain rate dynamic load application device according to claim 8, characterized in that: The medium is nitrogen.

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