A real-time online monitoring ultra-high cycle fatigue testing machine

Abstract

The present invention discloses a real-time online monitoring ultra-high cycle fatigue testing machine, which is characterized by also including a pull-out test clamp arranged on a multi-axis alignment platform for clamping a test piece and a monitoring system for real-time online monitoring of the test piece pull-out fatigue test, wherein the monitoring system is a scanning electron microscope for real-time monitoring of the test piece and a display for displaying the test piece data; it also includes a heater installed in a cabinet for heating the test piece and an infrared temperature sensor for detecting the temperature of the test piece. The invention adds a scanning electron microscope in the ultra-high cycle fatigue test, and monitors the test piece online and in real time during the fatigue test by the scanning electron microscope. The monitored data is synchronously displayed on the display, and the number of times the test piece is pulled before breaking is accurately measured, thereby accurately testing the fatigue strength and service life of the test piece.

Description

Technical Field

[0001] The present invention relates to an ultra-high cycle fatigue testing machine, in particular to an ultra-high cycle fatigue testing machine with real-time online monitoring. Background Technology

[0002] In major engineering applications such as aviation, aerospace, and nuclear power, metal structural materials often face high-temperature and high-frequency fatigue failure. This is a failure mode in which a material is damaged under the combined action of alternating loads and high-temperature environments. It is essentially the result of the synergistic effect of high temperature and fatigue. The fatigue strength of components in high-temperature environments is greatly reduced, and fatigue cracks are prone to occur. Therefore, it is very necessary to study the effect of high temperature on the fatigue behavior of components. In ultrasonic fatigue testing, especially for materials with relatively large damping, controlling the heat generated by the sample so that the sample temperature is close to the actual working conditions, while ensuring that the temperature control method does not affect the fatigue test, especially for small samples, is a technical problem that needs to be solved.

[0003] And currently, fatigue tests on certain structures and parts are generally performed offline. Ultrasonic fatigue vibration devices are used to perform ultra-high cycle fatigue tests on them. After the test, the completed parts are tested by scanning electron microscopes and other methods to test whether they are broken. However, cracks may have occurred inside the parts during the fatigue test, but they cannot be seen by the naked eye. In fact, cracks have already appeared from a microscopic point of view. Only after the ultra-high cycle test is completed, the parts are removed and then tested by scanning electron microscopes and other methods. However, when the parts are removed after the test is completed, they may have healed, resulting in inaccurate fatigue detection of the parts. At the same time, it is also impossible to accurately detect how many times the parts are pulled to produce cracks or breakage. For this reason, a real-time online monitoring ultra-high cycle fatigue testing machine is proposed. SUMMARY OF THE INVENTION

[0004] The purpose of this invention is to solve the above problems and to propose a real-time online monitoring ultra-high cycle fatigue testing machine.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a real-time online monitoring ultra-high cycle fatigue testing machine, comprising a control system, a cabinet, an ultrasonic fatigue vibration device arranged in the cabinet, and a multi-axis alignment platform for aligning the test piece; it is characterized in that it also comprises a pull-out test clamp arranged on the multi-axis alignment platform for clamping the test piece and a monitoring system for real-time online monitoring of the pull-out fatigue test of the test piece, the monitoring system is a scanning electron microscope for real-time monitoring of the test piece and a display for displaying the test piece data; it also comprises a heater installed in the cabinet for heating the test piece and an infrared temperature sensor for detecting the temperature of the test piece.

[0006] Further preferably, a lifting device is provided inside the cabinet, and a multi-axis alignment platform is also installed on the lifting device, and the ultrasonic fatigue vibration device is installed on the multi-axis alignment platform.

[0007] Further preferably, an eddy current cooling structure for uniformly cooling the specimen is also provided on the ultrasonic fatigue vibration device.

[0008] Further preferably, the eddy current cooling structure includes support columns installed on the ultrasonic fatigue vibration device, a cooling housing installed on the support columns, a rotating disk movably installed inside the cooling housing, and a number of blades obliquely arranged inside the rotating disk.

[0009] Further preferably, a number of air blowing joints for blowing transmission gas to drive the blades and drive the rotating disk to rotate are provided on the cooling housing, and a number of air blowing ports obliquely arranged on the rotating disk for guiding the gas and uniformly blowing the gas onto the specimen to uniformly cool the specimen are also provided.

[0010] Further preferably, a cladding plate is installed on the cooling housing, and a bearing is installed between the cladding plate and the rotating disk; a number of connecting rods connected to the support columns are installed on the cladding plate, and a number of adjustment holes for adjusting the connection position between the connecting rods and the support columns are provided on the support columns.

[0011] Further preferably, the ultrasonic fatigue vibration device includes a housing and a transducer installed inside the housing; the eddy current cooling structure is connected to the housing.

[0012] Further preferably, a number of air inlets and air outlets for communicating with the outside are provided on the housing, and a number of flow guiding grooves for improving the cooling effect of the transducer are provided inside the housing. The air inlets are connected to the flow guiding grooves, and an air inlet joint is connected to the air inlets.

[0013] Further preferably, the air outlets are divided into an upper air outlet provided on the upper part of the housing and a lower air outlet provided on the lower part of the housing. The flow guiding grooves are spirally arranged on the inner wall of the housing and are connected to the upper air outlet and the lower air outlet.

[0014] The beneficial effects of the present invention: By adding a scanning electron microscope in the ultra-high cycle fatigue test, the specimen is monitored online and in real time during the fatigue test by the scanning electron microscope, and the monitored data is synchronously displayed on the display, accurately measuring how many times the specimen breaks after pulling, so as to accurately test the fatigue strength and service life of the specimen;

[0015] By providing an eddy current cooling structure on the ultrasonic fatigue vibration device, it is used to uniformly cool the test piece during the drawing test, and make the air blown for cooling the test piece act uniformly on the test piece, avoiding the influence on the test of the test piece caused by the uneven acting force of the blown air on the test piece;

[0016] By providing a number of spiral diversion grooves on the outer shell and air outlets provided at both ends of the diversion grooves, the diversion grooves are used to guide the air entering the outer shell, making it form a spiral inside the outer shell, thereby improving the cooling effect and cooling speed of the transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 is a schematic structural diagram of the present invention;

[0018] Attached Figure 2 is a schematic partial structural diagram of the present invention;

[0019] Attached Figure 3 is a schematic structural diagram of the ultrasonic fatigue vibration device in the present invention;

[0020] Attached Figure 4 is a schematic partial sectional structural diagram of the ultrasonic fatigue vibration device in the present invention;

[0021] Attached Figure 5 is a schematic sectional structural diagram of the eddy current cooling structure in the present invention;

[0022] Attached Figure 6 is a schematic structural diagram of the rotating disk in the present invention;

[0023] Attached Figure 7 is a schematic flow control diagram of the present invention.

[0024] Legend: 1, cabinet; 2, ultrasonic fatigue vibration device; 21, outer shell; 22, transducer; 3, multi-axis alignment platform; 4, drawing test gripper; 5, heater; 6, lifting device; 7, eddy current cooling structure; 71, support column; 72, cooling housing; 73, rotating disk; 74, blade; 75, air blowing joint; 76, air blowing port; 77, double plate; 78, bearing; 79, connecting rod; 710, adjustment hole; 8, air inlet; 81, air outlet; 82, diversion groove; 83, air inlet joint; 85, upper air outlet; 86, lower air outlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, we will further explain a real-time online monitoring ultra-high cycle fatigue testing machine according to the present invention with reference to the accompanying drawings.

[0026] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back... are only used to explain the relative positional relationship and movement conditions between components in a specific posture as shown in the drawings. If the specific posture changes, the directional indications will also change accordingly.

[0027] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense; for example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Refer to Figure 1-7 As shown in [[REF]], a very high cycle fatigue testing machine for real-time online monitoring includes a control system, a cabinet 1, an ultrasonic fatigue vibration device 2 arranged in the cabinet 1, and a multi-axis alignment platform 3 for centering the test piece; it is characterized in that it further includes a drawing test gripper 4 arranged on the multi-axis alignment platform 3 for clamping the test piece and a monitoring system for real-time online monitoring of the drawing fatigue test of the test piece. The monitoring system is a scanning electron microscope for real-time monitoring of the test piece and a display for displaying the data of the test piece; it also includes a heater 5 installed in the cabinet 1 for heating the test piece and an infrared temperature sensor for detecting the temperature of the test piece;

[0029] The above-mentioned drawing test gripper 4 can be a clamping tool such as a chuck;

[0030] During the drawing test of the test piece, the test piece is heated by the heater 5, the temperature of the test piece is measured by the infrared sensor, and according to the measured temperature, the heater 5 is controlled to heat the test piece or the eddy current cooling structure 7 is controlled to uniformly cool the test piece, so that the test piece is within the set temperature range;

[0031] The above-mentioned heater 5 can adopt the heating method of an electromagnetic coil;

[0032] During the process of the drawing test, the test piece is monitored online in real time by the scanning electron microscope, and the monitored data is transmitted to the display for display. Through real-time online monitoring, the drawing times when cracks or fractures occur in the test piece can be accurately known, so as to accurately know the service life of the test piece.

[0033] In one embodiment, a lifting device 6 is provided in the cabinet 1, and a multi-axis alignment platform 3 is also installed on the lifting device 6, and the ultrasonic fatigue vibration device 2 is installed on the multi-axis alignment platform 3; the lifting device 6 is a column arranged in the cabinet 1 and a horizontal column placed on the column, and the multi-axis alignment platform 3 is installed on the horizontal column. The lifting device 6 can be a motor installed on the column and a screw rod connected to the motor, and the horizontal column is movably connected to the screw rod or a nut seat movably connected to the screw rod is installed on the horizontal column; during the lifting action, the screw rod can be driven to rotate by the motor, and during the rotation process, the screw rod drives the horizontal column to move up and down by cooperating with the thread of the horizontal column or the nut seat installed on the horizontal column; the setting of the lifting device 6 is used to drive the ultrasonic fatigue vibration device 2 to move up and down to adapt to test pieces of different sizes.

[0034] In one embodiment, it also includes an eddy current cooling structure 7 arranged on the ultrasonic fatigue vibration device 2 to evenly cool the test piece; through the arrangement of the eddy current cooling structure 7, the test piece can be evenly cooled when cooling the test piece, and the force of the blowing air also acts evenly on the test piece.

[0035] In one embodiment, the eddy current cooling structure 7 comprises a support column 71 mounted on the ultrasonic fatigue vibration device 2, a cooling shell 72 mounted on the support column 71, a rotating disk 73 movably mounted in the cooling shell 72, and a plurality of blades 74 installed in the rotating disk 73 and arranged obliquely;

[0036] It also includes a plurality of blowing joints 75 arranged on the cooling shell 72 for blowing the blades 74 with the transmission gas to drive the rotating disk 73 to rotate, and a plurality of blowing ports 76 arranged obliquely on the rotating disk 73 to guide the gas and blow the gas evenly onto the specimen to evenly cool the specimen;

[0037] Through the arrangement of the rotating disk 73 and the plurality of blades 74, the air is introduced into the cooling shell 72 through the air blowing joint 75, and the air blown into the cooling shell 72 blows the blades 74, thereby driving the rotating disk 73 to rotate. During the rotation of the rotating disk 73, the plurality of inclined air blowing ports 76 are driven to rotate. During the rotation, the air blowing ports 76 blow air evenly onto the specimen, and the plurality of air blowing ports 76 are arranged in a uniform array, so that the specimen is subjected to the air blown out of the air blowing ports 76 in all directions, and the effect of uniform heat dissipation can be achieved. At the same time, the force of the air blowing on the specimen is also uniformly applied to the specimen, thereby preventing the specimen from being subjected to uneven force and affecting the accuracy of the pulling test;

[0038] Through the arrangement of a plurality of air blowing joints 75, it is ensured that at least one of them can blow air onto the blades 74 to drive the rotating disk 73 to rotate.

[0039] In one embodiment, a backing plate 77 is mounted on the cooling housing 72, and a bearing 78 is mounted between the backing plate 77 and the rotating disk 73; a plurality of connecting rods 79 connected to the support columns 71 are mounted on the backing plate 77, and a plurality of adjustment holes 710 for adjusting the connection position between the connecting rods 79 and the support columns 71 are provided on the support columns 71; through the arrangement of the connecting rods 79 and the support columns 71, it is used for connecting between the eddy current cooling structure 7 and the outer shell 21. By providing a plurality of adjustment holes 710 on the support columns 71, the connection and fixing position between the connecting rods 79 and the support columns 71 can be adjusted according to the size of the specimen, so as to adjust the height position of the cooling housing 72, thus being applicable to specimens of different sizes.

[0040] In one embodiment, the ultrasonic fatigue vibration device 2 includes an outer shell 21 and a transducer 22 mounted inside the outer shell 21; the eddy current cooling structure 7 is connected to the outer shell 21.

[0041] In one embodiment, it further includes a plurality of air inlets 8 and air outlets 81 provided on the outer shell 21 for communicating with the outside and a plurality of flow guiding grooves 82 provided inside the outer shell 21 for improving the cooling effect of the transducer 22. The air inlets 8 are connected to the flow guiding grooves 82, and an air inlet joint 83 is connected to the air inlets 8;

[0042] By providing a plurality of flow guiding grooves 82 spirally arranged on the inner wall of the outer shell 21 and the air inlets 8 being communicated with the flow guiding grooves 82, the gas entering the outer shell 21 through the air inlets 8 moves along the flow guiding grooves 82, so as to perform a spiral movement inside the outer shell 21, thereby improving the overall cooling and cooling speed of the transducer 22, thus improving the cooling effect and the service life of the transducer 22.

[0043] In one embodiment, the air outlets 81 are divided into an upper air outlet 85 provided on the upper part of the outer shell 21 and a lower air outlet 86 provided on the lower part of the outer shell 21. The flow guiding grooves 82 are spirally arranged on the inner wall of the outer shell 21 and are connected to the upper air outlet 85 and the lower air outlet 86. The gas entering the outer shell 21 forms a spiral air flow inside the outer shell 21 under the action of the flow guiding grooves 82, and after heat exchange cooling the transducer 22 through the spiral air flow, it is discharged through the upper air outlet 85 and the lower air outlet 86, and the cooling effect is good.

[0044] The working process of the present invention: The following multi-axis alignment platform 3 is a conventional adjustment device for adjusting positions in the prior art;

[0045] First, the multi-axis alignment platform 3 is controlled by the control system to adjust the positions of the ultrasonic fatigue vibration device 2 and the drawing test gripper 4 so that they are on the same center line, and then the height position of the ultrasonic fatigue vibration device 2 is adjusted through the lifting device 6 according to the size of the specimen;

[0046] Then fix one end of the test piece to the pull-out test holder 4, and the other end to the ultrasonic fatigue vibration device 2;

[0047] Move the heater 5 to the specimen and start the heater 5 to heat the specimen;

[0048] At the same time, the infrared temperature sensor detects the temperature of the specimen in real time and transmits the data to the display until the time temperature reaches the set temperature and stops heating;

[0049] Then the ultrasonic fatigue vibration device 2 is controlled to start the pulling test on the specimen and transmit the pulling times to the display for recording;

[0050] During the pulling test, the specimen is monitored online in real time through a scanning electron microscope;

[0051] During the operation of the ultrasonic fatigue vibration device 2, the air inlet connector 83 is connected to the air source through a pipeline, and the air source supplies air. The air inlet connector 83 guides the air to the air inlet 8 and then enters the housing 21 to evenly dissipate heat and cool the transducer 22;

[0052] During the pulling test, the temperature of the test piece is monitored in real time through an infrared temperature sensor;

[0053] When the temperature of the specimen exceeds the set temperature value, air is supplied to the air outlet 76 through the air source, and the air is blown into the cooling shell 72 through the air outlet 76 to blow the blades 74, and the blades 74 drive the rotating disk 73 to rotate. At the same time, during the rotation process, the air is driven to blow evenly from the plurality of air outlets 76 to the specimen, and the specimen is evenly cooled until the temperature of the specimen reaches the set temperature value and then the cooling is stopped;

[0054] The pull-out test will be stopped until the SEM detects cracks in the specimen and it will break. The data will be transmitted to the display for recording and storage. The operator can check the data on the display to know the number of pull-outs of the specimen, and the accurate fatigue strength and service life of the specimen. After the test is completed, the specimen can be removed.

[0055] The protection scope of the present invention is not limited to the above embodiments and their variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment all fall within the protection scope of the present invention.​

Claims

1. A real-time online monitoring ultra-high cycle fatigue testing machine, comprising a control system, a cabinet (1), an ultrasonic fatigue vibration device (2) arranged in the cabinet (1), and a multi-axis alignment platform (3) for aligning a test piece; wherein the test piece is It also includes a pull-out test clamp (4) arranged on the multi-axis alignment platform (3) for clamping the test piece and a monitoring system for real-time online monitoring of the test piece pull-out fatigue test. One end of the test piece is fixed on the pull-out test clamp, and the other end is fixedly connected to the ultrasonic fatigue vibration device. The monitoring system is a scanning electron microscope for real-time monitoring of the test piece and a display for displaying the test piece data. The monitored data is synchronously displayed on the display. It also includes a heater (5) installed in the cabinet (1) for heating the test piece and an infrared temperature sensor for detecting the temperature of the test piece. It also includes an eddy current cooling structure arranged on the ultrasonic fatigue vibration device (2) for uniformly cooling the test piece. (7); the eddy current cooling structure (7) comprises a support column (71) mounted on the ultrasonic fatigue vibration device (2), a cooling shell (72) mounted on the support column (71), a rotating disk (73) movably mounted in the cooling shell (72), and a plurality of blades (74) mounted in the rotating disk (73) and arranged in an inclined manner; it also comprises a plurality of blowing joints (75) arranged on the cooling shell (72) for transmitting gas and blowing the blades (74) to drive the rotating disk (73) to rotate, and a plurality of blowing ports (76) arranged in an inclined manner on the rotating disk (73) for guiding the gas and blowing the gas evenly onto the test piece, thereby evenly cooling the test piece.

2. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 1, characterized in that: The cabinet (1) is provided with a lifting device (6), a multi-axis alignment platform (3) is also installed on the lifting device (6), and the ultrasonic fatigue vibration device (2) is installed on the multi-axis alignment platform (3) on the lifting device.

3. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 1, characterized in that: A double plate (77) is installed on the cooling shell (72), and a bearing (78) is installed between the double plate (77) and the rotating disk (73); a plurality of connecting rods (79) connected to the support column (71) are installed on the double plate (77), and a plurality of adjustment holes (710) for adjusting the connection position between the connecting rods (79) and the support column (71) are provided on the support column (71).

4. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 1, characterized in that: The ultrasonic fatigue vibration device (2) comprises a housing (21) and a transducer (22) installed in the housing (21); the eddy current cooling structure (7) is connected to the housing (21).

5. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 4, characterized in that: It also includes a plurality of air inlets (8) and air outlets (81) arranged on the housing (21) for communicating with the outside, and a plurality of guide grooves (82) arranged in the housing (21) for improving the cooling effect of the transducer (22), wherein the air inlet (8) is connected to the guide groove (82), and an air inlet connector (83) is connected to the air inlet (8).

6. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 5, characterized in that: The air outlet (81) is divided into an upper air outlet (85) arranged at the upper part of the outer shell (21) and a lower air outlet (86) arranged at the lower part of the outer shell (21), and the guide groove (82) is arranged in a spiral shape on the inner wall of the outer shell (21) and is connected to the upper air outlet (85) and the lower air outlet (86).

Images