CN118655024A - A special ultra-high frequency response tension-torsion composite force loading platform under ray field and operation method - Google Patents

Abstract

The present invention discloses a special ultra-high frequency response tension-torsion composite force loading platform and an operation method under a ray field, which are applied in the field of material mechanical property testing and detection. The technical scheme thereof mainly comprises: a ray detection device is provided, and a fatigue loading system is fixedly connected to a rotating platform of the ray detection device; the fatigue loading system comprises a static pressure loading unit fixedly connected to one end of the rotating platform for providing a tensile or compressive load to a sample, and a torsion loading unit fixedly connected to the other end of the rotating platform, a lower clamp and an upper clamp are fixedly provided on the static pressure loading unit and the torsion loading unit respectively, a bearing cylinder is fixedly connected between the static pressure loading unit and the torsion loading unit, and an environmental module for simulating fatigue tests of samples under various environments is fixedly connected in the bearing cylinder; the technical effects thereof are: diversified test functions and high test accuracy.

Description

A special ultra-high frequency response tension-torsion composite force loading platform under ray field and operation method

Technical Field

The invention relates to the field of material mechanical property testing and detection, and in particular to a special ultra-high frequency response tension-torsion composite force loading platform under a ray field and an operation method thereof.

Background Art

Material fatigue testing is the process of evaluating the performance and life of a material under cyclic loading conditions. This test simulates the situation in which the material is subjected to repeated stress or strain in actual use to determine its fatigue strength and life. It is widely used in aerospace, automotive, machinery, civil engineering and other fields to ensure that materials and structures have sufficient safety and reliability in long-term service. Through fatigue testing, engineers can predict the performance of materials in actual use and improve material selection and design to improve product durability and safety.

The tension-torsion composite fatigue test is a test method for evaluating the fatigue performance of materials under conditions of simultaneous tension (or compression) and torsion cyclic loading. This test simulates the actual working conditions of materials under complex stress states. Combined with high-temperature and low-temperature environment modules, the test process is closer to the stress conditions and working environment of some mechanical and structural parts during use. Combined with X-ray field nuclear imaging technology, it can clearly and intuitively display the internal structure, defects and crack conditions of the tested object in the form of two-dimensional or three-dimensional images without damaging the material, providing intuitive and reliable data for material analysis.

At present, a Chinese invention with a publication number of CN116296931A discloses a static pressure zero-friction in-situ fatigue loading device, including a frame with an oil inlet pipeline and an oil outlet pipeline, the oil inlet pipeline and the oil outlet pipeline are commonly connected to a servo valve, a detection area is provided in the middle of the frame, a load detection mechanism is installed in the detection area, and a loading mechanism is installed on the frame. The loading mechanism drives the load detection mechanism to load the sample in-situ at high frequency through the external hydraulic oil through the servo valve, the oil inlet pipeline and the oil outlet pipeline inside the frame.

The existing invention forms a closed-loop oil circuit through a servo valve, an external servo hydraulic cylinder, and a high-pressure oil through an oil inlet and an oil outlet. The use of the servo valve enables its loading mechanism to achieve high-frequency reversing + in-situ loading of the sample. Finally, the load value of the sample is detected by the load detection mechanism in the process to achieve high-frequency fatigue load on the sample, thereby saving the test time. However, on the one hand, the existing invention can only achieve tensile and compressive fatigue testing of the sample, with a single loading method and few test functions, and the existing invention can only be applied to microscopic detection fields such as metallographic microscopes and electron microscopes, and cannot be applied to detection under a ray field; on the other hand, the existing invention positively controls the oil pressure value of the high-pressure oil in the servo hydraulic cylinder through the oil inlet and the oil outlet through the servo valve, thereby enabling the loading mechanism to achieve high-frequency reversing, but cannot accurately control the stability of the force applied to the sample by each servo hydraulic cylinder during the high-frequency loading process, which reduces the accuracy of the test and needs improvement.

Summary of the invention

The first object of the present invention is to provide a special ultra-high frequency response tension-torsion composite force loading platform under a ray field, which has the advantages of diversified test functions and high test accuracy.

The above technical objectives of the present invention are achieved through the following technical solutions: a special ultra-high frequency response tension-torsion composite force loading platform under a ray field, comprising a ray detection device, a fatigue loading system is fixedly connected to the rotating platform of the ray detection device; the fatigue loading system comprises a static pressure loading unit fixedly connected to one end of the rotating platform for providing a tensile or compressive load to the sample, and a torsion loading unit fixedly connected to the other end of the rotating platform for providing a torsion load to the sample, the static pressure loading unit and the torsion loading unit are respectively fixedly provided with a lower clamp and an upper clamp for positioning and fixing the two ends of the sample, a bearing cylinder is fixedly connected between the static pressure loading unit and the torsion loading unit, and an environmental module for simulating fatigue tests of the sample under various environments is fixedly connected in the bearing cylinder. .

The present invention is further configured as follows: the hydrostatic loading unit includes a hydrostatic actuator cylinder fixedly connected to the rotating table and a piston rod slidably connected to the hydrostatic actuator cylinder, which is used to apply a tensile or compressive load to the lower clamp along the rotation center line direction of the rotating table. The hydrostatic actuator cylinder is provided with a piston chamber for the piston ring to slide, and the flow direction and pressure of the high-pressure oil in the piston chamber are controlled by a servo valve so that the piston rod can achieve displacement and force output.

The present invention is further configured as follows: a tension-torsion composite force measuring sensor for measuring the torsion force and axial force of the sample is fixedly connected between the lower clamp and the piston rod, and a displacement measuring sensor for measuring the displacement distance is fixedly connected to the piston rod. By feeding back the measurement data of the tension-torsion composite force measuring sensor and the displacement measuring sensor to the measurement and control system, the measurement and control system controls the servo valve to achieve closed-loop control of the loading force and displacement of the piston rod.

The present invention is further configured as follows: the torsion loading unit includes a fixedly arranged servo motor, the rotating shaft of the servo motor is connected to the input end of the reducer, the upper clamp is connected to the output end of the reducer, and the servo motor is provided with an angle measurement sensor for measuring the torsion angle of the sample.

The present invention is further configured as follows: the environmental module generates a high temperature environment or a low temperature environment by radiation or conduction, thereby realizing fatigue testing of the sample in a high temperature environment or a low temperature environment, and at the same time, different atmosphere environments are generated by injecting inert gas, carbon dioxide and water vapor into the environmental module, thereby realizing fatigue testing of the sample in different atmosphere environments.

The present invention is further configured such that: the supporting tube is made of a metal or non-metal material having sufficient rigidity and good radiation transmittance, so as to achieve the effect of imaging and cleaning the sample by absorbing less radiation.

The present invention is further configured such that: the supporting tube is made of carbon fiber composite material.

The second object of the present invention is to provide an operation method of a special ultra-high frequency response tension-torsion composite force loading platform under a ray field, which has the advantages of diversified test functions and high test accuracy.

The above technical objectives of the present invention are achieved through the following technical solutions: an operation method of a special ultra-high frequency response tension-torsion composite force loading platform under a ray field, using a special ultra-high frequency response tension-torsion composite force loading platform under a ray field as described in the above technical solution, and also including a host computer and a multi-channel controller; including:

Step 1: The host computer issues a control command, and the multi-channel controller receives the command for processing and sends the control command to the static pressure loading unit and the torsion loading unit respectively, so that the corresponding static pressure loading unit and the torsion loading unit respectively stretch, compress and torsion the sample according to the command;

Step 2: The displacement measuring sensor arranged on the static pressure loading unit measures the displacement data, and the angle measuring sensor arranged on the torsion loading unit measures the torsion angle data, and the tension-torsion composite force measuring sensor measures the torsion force and axial force of the torsion loading unit and the static pressure loading unit;

Step 3: Feedback the displacement measurement results, torsion measurement results and force measurement results to the multi-channel controller. The multi-channel controller continues to control the static pressure loading unit and the torsion loading unit according to the measurement data so that the actual output results are consistent with the host computer command, and realizes displacement torsion and load dual closed-loop control. At the same time, the multi-channel controller transmits the actual displacement, torsion angle and load data to the host computer, and the host computer analyzes and draws the test curve according to the received data;

Step 4: The host computer customizes the segmented test. After completing a certain cycle of tension-torsion (tension, compression, twisting, etc.) fatigue test, the test is paused or the current state is maintained for a certain period of time. At the same time, the X-ray detection device performs a scan. After completing the scan, the next cycle of tension-torsion (tension, compression, twisting, etc.) fatigue test is performed (that is, after stretching to a certain force value, the sample is allowed to remain stable for clear imaging under X-rays), and then the next scan is performed through the X-ray detection device, and this cycle is repeated.

In summary, the present invention has the following beneficial effects:

1. By setting a static pressure loading unit and a torsion loading unit on the rotating table at the same time, the sample can be subjected to static tests and dynamic fatigue tests of multiple working conditions such as tension, compression, torsion, tension and compression, tension and torsion, and compression and torsion at the same time. At the same time, by setting an environmental module in the bearing tube, a high temperature environment or a low temperature environment is generated by radiation or conduction, and different atmosphere environments are generated by injecting inert gas, carbon dioxide and water vapor into the environmental module, so as to realize fatigue testing of the sample in different atmosphere environments. The function is diversified, and fatigue testing of the sample in multiple working conditions can be realized in different environmental atmospheres. At the same time, by setting the bearing tube, the ray field can penetrate the bearing tube within 360° to realize detection of the sample;

2. By feeding back the displacement measurement results, torsion measurement results and force measurement results to the multi-channel controller, the multi-channel controller continues to control the static pressure loading unit and the torsion loading unit according to the measurement data so that the actual output results are consistent with the host computer commands, realizing displacement torsion and load dual closed-loop control, thereby improving the accuracy of the test.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of the present embodiment;

FIG2 is a cross-sectional view of the overall structure of this embodiment;

FIG3 is a cross-sectional view of the overall structure of the present embodiment;

FIG4 is an enlarged schematic diagram of part A of FIG3 ;

FIG5 is a cross-sectional view of the structure of the static pressure loading unit of this embodiment;

FIG. 6 is a cross-sectional view of the structure of the torsion loading unit of this embodiment.

Figure numerals: 1. X-ray detection device; 11. Rotating table; 12. Lower fixture; 13. Upper fixture; 2. Hydrostatic loading unit; 21. Hydrostatic actuator cylinder; 22. Piston rod; 23. Piston chamber; 24. Servo valve; 25. Tension-torsion combined force measurement sensor; 26. Displacement measurement sensor; 3. Torsion loading unit; 31. Servo motor; 32. Reducer; 33. Angle measurement sensor; 4. Carrying cylinder; 5. Environmental module.

DETAILED DESCRIPTION

The present invention is further described in detail below in conjunction with the accompanying drawings.

Embodiment 1:

Referring to Figures 1 to 6, a special ultra-high frequency response tension-torsion composite force loading platform under a ray field includes a ray detection device 1, and a fatigue loading system is fixedly connected to a rotating table 11 of the ray detection device 1. By installing the fatigue loading system on the rotating table 11, the rotating table 11 drives the fatigue loading system to rotate as a whole during imaging, thereby realizing 360-degree scanning imaging of the sample installation position by the ray. The fatigue loading system includes a static pressure loading unit 2 fixedly connected to one end of the rotating table 11 for providing a tensile or compressive load to the sample, and a torsion unit fixedly connected to the other end of the rotating table 11 for providing a torsion load to the sample. The loading unit 3, the static pressure loading unit 2 and the torsion loading unit 3 are respectively fixed with a lower clamp 12 and an upper clamp 13 for positioning and fixing the two ends of the sample. The static pressure loading unit 2 and the torsion loading unit 3 cooperate to realize the static test and dynamic fatigue test of multiple working conditions such as tension, compression, torsion and tension-compression, tension-twist, compression-twist, etc. on the sample at the same time. A bearing cylinder 4 is fixedly connected between the static pressure loading unit 2 and the torsion loading unit 3. The bearing cylinder 4 is mainly used to bear the tension, compression and torsion loads of the fatigue loading system. An environmental module 5 for simulating fatigue tests of the sample under various environments is fixedly connected in the bearing cylinder 4. In this embodiment, the ray detection device 1 uses CT to scan the sample by X-rays to obtain the internal structure, defects and crack conditions of the sample.

Referring to Figures 2 and 5, specifically, the static pressure loading unit 2 includes a static pressure actuator cylinder 21 fixedly connected to the rotating table 11 and a piston rod 22 slidably connected to the static pressure actuator cylinder 21, which is used to apply a tensile or compressive load to the lower fixture 12 along the direction parallel to the rotation centerline of the rotating table 11. A piston chamber 23 for the piston ring to slide is provided on the static pressure actuator cylinder 21. The flow direction and pressure of the high-pressure oil in the piston chamber 23 are controlled by a servo valve 24 so that the piston rod 22 can achieve displacement and force output. The power source of the piston rod 22 is a constant pressure oil source to provide stable pressure. A tension-torsion composite force measurement sensor 25 for measuring the torsional force and axial force of the sample is fixedly connected between the lower fixture 12 and the piston rod 22. Since the force is mutual, the tension-torsion composite force The force measurement sensor 25 measures the torsional force of the sample on the lower fixture 12 under the torsion state to obtain the torsional force of the torsion loading unit 3 on the sample. A displacement measurement sensor 26 for measuring the displacement distance is fixedly connected to the piston rod 22. By feeding back the measurement data of the tension-torsion composite force measurement sensor 25 and the displacement measurement sensor 26 to the measurement and control system (i.e., the multi-channel controller in Example 2), the measurement and control system controls the servo valve 24 to achieve closed-loop control of the loading force and displacement of the piston rod 22. At the same time, the static pressure loading unit 2 adopts static pressure support technology. Based on the effect of liquid pressure, a liquid pressure film is formed between the piston rod 22 and the piston cavity 23 to provide support and lubrication, so that the piston rod 22 can operate with high precision, low friction and long life, thereby realizing high-frequency response loading.

2 and 6 , specifically, the torsion loading unit 3 includes a fixedly arranged servo motor 31, the rotating shaft of the servo motor 31 is connected to the input end of the reducer 32, the upper fixture 13 is connected to the output end of the reducer 32, and the servo motor 31 is provided with an angle measuring sensor 33 for measuring the torsion angle of the sample. The servo motor 31 drives the sample to twist through the reducer so as to perform a torsional fatigue test on the sample. The torsion angle of the sample is obtained through the angle measuring sensor 33, and the measurement data of the tension-torsion composite force measurement sensor 25 and the angle measurement sensor 33 are fed back to the measurement and control system, so that the measurement and control system controls the closed-loop control of the torsion loading force and the torsion angle of the servo motor 31.

Referring to Figures 3 and 4, specifically, the environmental module 5 realizes a high temperature environment or a low temperature environment through radiation or conduction, thereby realizing fatigue testing of the sample in a high temperature environment or a low temperature environment. At the same time, different atmosphere environments are generated by injecting inert gas, carbon dioxide, and water vapor into the environmental module 5, thereby realizing fatigue testing of the sample in different environmental atmospheres.

Specifically, the carrier tube 4 is made of metal or non-metal material with sufficient rigidity and good radiation penetration, so as to absorb less radiation and achieve the effect of cleaning the sample imaging. In this embodiment, the carrier tube 4 is made of, but not limited to, carbon fiber composite material.

Embodiment 2:

An operating method of a special ultra-high frequency response tension-torsion composite force loading platform under a ray field, using a special ultra-high frequency response tension-torsion composite force loading platform under a ray field as shown in the embodiment, and also including a host computer and a multi-channel controller, including:

Step 1: The host computer issues a control command, and the multi-channel controller receives the command for processing and sends the control command to the static pressure loading unit 2 and the torsion loading unit 3 respectively, so that the corresponding static pressure loading unit 2 and the torsion loading unit 3 respectively stretch, compress and torsion the sample according to the command;

Step 2, the displacement measurement sensor 26 arranged on the static pressure loading unit 2 measures the displacement data, and the angle measurement sensor 33 arranged on the torsion loading unit 3 measures the torsion angle data, and the tension-torsion composite force measurement sensor 25 measures the torsion force and axial force of the torsion loading unit 3 and the static pressure loading unit 2;

Step 3, feeding back the displacement measurement results, torsion measurement results and force measurement results to the multi-channel controller, and the multi-channel controller continues to control the static pressure loading unit 2 and the torsion loading unit 3 according to the measurement data so that the actual output result is consistent with the host computer command, and realizes displacement torsion and load double closed-loop control. At the same time, the multi-channel controller transmits the actual displacement, torsion angle and load data to the host computer, and the host computer analyzes and draws the test curve according to the received data;

Step 4: The host computer customizes the segmented test. After completing a certain cycle of tension-torsion (tension, compression, twisting, etc.) fatigue test, the test is paused or the current state is maintained for a certain period of time. At the same time, the ray detection device 1 performs a scan. After completing the scan, the next cycle of tension-torsion (tension, compression, twisting, etc.) fatigue test is performed (that is, after stretching to a certain force value, the sample is allowed to remain stable for clear imaging under X-rays), and then the next scan is performed through the ray detection device 1, and this cycle is repeated.

This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims (8)

1. The special ultrahigh frequency response tension torsion compound force loading table comprises a ray detection device (1), wherein a fatigue loading system is fixedly connected to a rotary table (11) of the ray detection device (1); the fatigue loading system is characterized by comprising a static pressure loading unit (2) fixedly connected to one end of a rotating table (11) and used for providing tensile or compressive load for a sample, and a torsion loading unit (3) fixedly connected to the other end of the rotating table (11) and used for providing torsion load for the sample, wherein a lower clamp (12) and an upper clamp (13) used for positioning and fixing two ends of the sample are respectively fixedly arranged on the static pressure loading unit (2) and the torsion loading unit (3), a bearing cylinder (4) is fixedly connected between the static pressure loading unit (2) and the torsion loading unit (3), and an environment module (5) used for simulating the fatigue test of the sample in various environments is fixedly connected in the bearing cylinder (4).

2. The ultra-high frequency response pull torsion compound force loading table special for a radiation field according to claim 1, wherein the static pressure loading unit (2) comprises a static pressure actuator cylinder barrel (21) fixedly connected to the rotary table (11) and a piston rod (22) slidingly connected to the static pressure actuator cylinder barrel (21) and used for applying tensile or compressive load to the lower clamp (12) along the direction parallel to the rotation center line of the rotary table (11), a piston cavity (23) for sliding of the piston ring is formed in the static pressure actuator cylinder barrel (21), and the circulation direction and pressure of high-pressure oil in the piston cavity (23) are controlled through a servo valve (24) so that the piston rod (22) can realize displacement and force output.

3. The ultrahigh frequency response tension-torsion combined force loading table special for a radiation field according to claim 2, wherein a tension-torsion combined force measuring sensor (25) for measuring torsion force and axial force of a sample is fixedly connected between the lower clamp (12) and the piston rod (22), a displacement measuring sensor (26) for measuring displacement distance is fixedly connected on the piston rod (22), and the tension-torsion combined force measuring sensor (25) and the displacement measuring sensor (26) are fed back to a measurement and control system, so that the measurement and control system controls the servo valve (24) to realize closed loop control of loading force and displacement of the piston rod (22).

4. A special ultrahigh frequency response pull torsion compound force loading table under a radiation field according to claim 3, wherein the torsion loading unit (3) comprises a servo motor (31) which is fixedly arranged, a rotating shaft of the servo motor (31) is connected to an input end of a speed reducer (32), the upper clamp (13) is connected with an output end of the speed reducer (32), and an angle measuring sensor (33) for measuring a torsion angle of a sample is arranged on the servo motor (31).

5. The ultra-high frequency response tension torsion compound force loading table special for the radiation field according to claim 1, wherein the environment module (5) is used for realizing the generation of a high-temperature environment or a low-temperature environment in a radiation or conduction mode, so that the fatigue test of the sample in the high-temperature environment or the low-temperature environment is realized, and meanwhile, the fatigue test of the sample in different atmosphere environments is realized by injecting inert gas, carbon dioxide, water vapor and the like into the environment module (5).

6. The ultrahigh frequency response tension torsion combined force loading table special for the radiation field according to claim 1, wherein the bearing cylinder (4) is made of a metal or nonmetal material with sufficient rigidity and good radiation penetrability so as to realize the effect of absorbing less radiation to achieve the imaging cleaning effect of a sample.

7. The ultra-high frequency response tension torsion composite force loading table special for a radiation field according to claim 6, wherein the bearing cylinder (4) is made of carbon fiber composite materials.

8. An operation method of a special ultrahigh frequency response tension torsion combined force loading table under a ray field, which is applied to the special ultrahigh frequency response tension torsion combined force loading table under the ray field as claimed in claim 4, and further comprises an upper computer and a multichannel controller; characterized by comprising the following steps:

Step 1, an upper computer sends out a control command, a multichannel controller receives the command for processing and sends the control command to a static pressure loading unit (2) and a torsion loading unit (3) respectively, so that the corresponding static pressure loading unit (2) and the torsion loading unit (3) stretch, compress and twist a sample respectively according to the command;

Step 2, a displacement measuring sensor (26) arranged on the static pressure loading unit (2) measures displacement data, and an angle measuring sensor (33) arranged on the torsion loading unit (3) measures torsion angle data, and a tension-torsion compound force measuring sensor (25) measures torsion force and axial force of the torsion loading unit (3) and the static pressure loading unit (2);

Step 3, feeding back the displacement measurement result, the torsion measurement result and the force measurement result to a multi-channel controller, wherein the multi-channel controller continuously controls the static pressure loading unit (2) and the torsion loading unit (3) according to the measurement data so that the actual output result is consistent with the command of the upper computer, displacement torsion and load double closed-loop control is realized, and meanwhile, the multi-channel controller transmits the actual displacement, torsion angle and load data to the upper computer, and the upper computer analyzes and draws a test curve according to the received data;

and 4, carrying out self-defined sectional test by an upper computer, suspending or maintaining the current state for a certain time after the fatigue test of a certain period of tension torsion (tension, compression, torsion and the like) is finished, simultaneously carrying out one-time scanning by a ray detection device (1), carrying out the fatigue test of the tension torsion (tension, compression, torsion and the like) of the next period after the completion of the scanning (namely, keeping the sample stably and clearly imaged under X rays after the sample is stretched to a certain force value), and carrying out the next scanning by the ray detection device (1) so as to reciprocate.