Ultrahigh-cycle fatigue testing machine with real-time online monitoring function

Abstract

The invention discloses a real-time on-line monitoring ultra-high cycle fatigue testing machine which is characterized by further comprising a pull-out test holder arranged on a multi-axis alignment platform and used for clamping a test piece and a monitoring system for real-time on-line monitoring of a pull-out fatigue test of the test piece, the monitoring system comprises a scanning electron microscope for monitoring the test piece in real time and a display for displaying data of the test piece; the heater is mounted in the cabinet and is used for heating the test piece; the infrared temperature sensor is used for detecting the temperature of the test piece. The scanning electron microscope is additionally arranged in the ultra-high cycle fatigue test, the test piece is monitored on line in real time in the fatigue test process of the test piece through the scanning electron microscope, monitored data are synchronously displayed in the displayer, the number of times of fracture of the test piece after drawing is accurately measured, and the test accuracy is improved. Therefore, the fatigue strength and the service life of the test piece can be accurately tested.

Description

Technical Field

[0001] The 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 Art

[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 specimen so that the specimen temperature is close to the actual working conditions, while ensuring that the temperature control method does not affect the fatigue test, especially for small specimens, is a technical problem that needs to be solved.

[0003] At present, fatigue tests on some 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 is completed, 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, after the test is completed, the parts that are removed for testing 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 the present invention is to solve the above problems and to provide 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 a test piece; it is characterized in that it also includes a pulling 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 test piece pulling fatigue test, 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 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 in the cabinet, 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] More preferably, it also includes an eddy current cooling structure arranged on the ultrasonic fatigue vibration device to uniformly cool the test piece.

[0008] Further preferably, the eddy current cooling structure comprises a support column mounted on the ultrasonic fatigue vibration device, a cooling shell mounted on the support column, a rotating disk movably mounted in the cooling shell, and a plurality of blades installed in the rotating disk and arranged obliquely.

[0009] Further preferably, it also includes a plurality of blowing joints arranged on the cooling shell for transmitting gas to blow the blades and drive the rotating disk to rotate, and a plurality of blowing ports arranged obliquely on the rotating disk to guide the gas and blow the gas evenly onto the specimen to evenly cool the specimen.

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

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

[0012] Further preferably, it also includes a plurality of air inlets and air outlets arranged on the shell for communicating with the outside world and a plurality of guide grooves arranged in the shell for improving the cooling effect of the transducer, the air inlet is connected to the guide groove, and an air inlet connector is connected to the air inlet.

[0013] Further preferably, the air outlet is divided into an upper air outlet arranged at the upper part of the shell and a lower air outlet arranged at the lower part of the shell, and the guide groove is spirally arranged on the inner wall of the shell and connected to the upper air outlet and the lower air outlet.

[0014] The beneficial effects of the present invention are as follows: by adding a scanning electron microscope in the ultra-high cycle fatigue test, the specimen is monitored online in real time during the fatigue test by the scanning electron microscope, and the monitored data is synchronously displayed on the display, and the number of times the specimen is pulled before breaking is accurately measured, thereby accurately testing the fatigue strength and service life of the specimen; By setting an eddy current cooling structure on the ultrasonic fatigue vibration device, the test piece is evenly cooled during the drawing test, and the air blown out for cooling the test piece acts evenly on the test piece, thus avoiding the test piece being affected by the uneven force of the air blown out. By arranging a plurality of spirally arranged guide grooves on the shell and air outlets at both ends of the guide grooves, the guide grooves guide the air entering the shell to form a spiral in the shell, thereby improving the cooling effect and cooling speed of the transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a schematic diagram of the structure of the present invention; Attached Figure 2 It is a partial structural schematic diagram of the present invention; Attached Figure 3 It is a schematic diagram of the structure of the ultrasonic fatigue vibration device in the present invention; Attached Figure 4 It is a schematic diagram of a partial cross-sectional structure of the ultrasonic fatigue vibration device in the present invention; Attached Figure 5 It is a schematic cross-sectional structure diagram of the eddy current cooling structure in the present invention; Attached Figure 6 It is a structural schematic diagram of the rotating disk in the present invention; Attached Figure 7 It is a schematic diagram of the process control of the present invention.

[0016] Legend: 1. Cabinet; 2. Ultrasonic fatigue vibration device; 21. Housing; 22. Transducer; 3. Multi-axis alignment platform; 4. Pull-out test clamp; 5. Heater; 6. Lifting device; 7. Eddy current cooling structure; 71. Support column; 72. Cooling shell; 73. Rotating disk; 74. Blade; 75. Air blow joint; 76. Air blow port; 77. Composite plate; 78. Bearing; 79. Connecting rod; 710. Adjustment hole; 8. Air inlet; 81. Air outlet; 82. Guide groove; 83. Air inlet joint; 85. Upper air outlet; 86. Lower air outlet. DETAILED DESCRIPTION

[0017] Next, we will further explain the real-time online monitoring ultra-high cycle fatigue testing machine of the present invention with reference to the accompanying drawings.

[0018] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0019] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense; for example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] See also Figure 1-7 As shown in, a real-time online monitoring ultra-high cycle fatigue testing machine 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 aligning a test piece; it is characterized in that 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, 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 5 installed in the cabinet 1 for heating the test piece and an infrared temperature sensor for detecting the temperature of the test piece; The above-mentioned pull-out test holder 4 can be a clamping tool such as a chuck; During the specimen pulling test, the specimen is heated by the heater 5, and the temperature of the specimen is measured by the infrared sensor. According to the measured temperature, the heater 5 is controlled to heat the specimen or the eddy current cooling structure 7 is controlled to evenly cool the specimen, so that the specimen is within the set temperature range; The heater 5 may be heated by an electromagnetic coil; During the pulling test, the specimen is monitored online in real time through a scanning electron microscope, and the monitoring data is transmitted to the display for display. Online real-time monitoring can accurately know the number of pulling times when the specimen cracks or breaks, thereby accurately knowing the service life of the specimen.

[0021] 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 transmission, 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.

[0022] In one embodiment, it also includes an eddy current cooling structure 7 arranged on the ultrasonic fatigue vibration device 2 to uniformly cool the test piece; through the arrangement of the eddy current cooling structure 7, the test piece can be uniformly cooled when cooling the test piece and the force of the blowing air is also uniformly applied to the test piece.

[0023] 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; It also includes a plurality of air blowing joints 75 arranged on the cooling housing 72 for blowing the blades 74 with the transmission gas to drive the rotating disk 73 to rotate, and a plurality of air 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; By setting the rotating disk 73 and the plurality of blades 74, 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 process, the rotating disk 73 drives the plurality of inclined air blowing ports 76 to rotate. During the rotation process, the air blowing ports 76 blow air evenly onto the test piece, and the plurality of air blowing ports 76 are evenly arranged in an array, so that the test piece is evenly exposed to the air blown out of the air blowing ports 76, which can achieve the effect of even heat dissipation. At the same time, the force of the air blowing on the test piece is also evenly applied to the test piece, thereby preventing the test piece from being subjected to uneven force and affecting the accuracy of the pulling test. By disposing 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 during air blowing.

[0024] In one embodiment, a composite plate 77 is installed on the cooling shell 72, and a bearing 78 is installed between the composite plate 77 and the rotating disk 73; a plurality of connecting rods 79 connected to the support column 71 are installed on the composite 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; by setting the connecting rods 79 and the support column 71, the eddy current cooling structure 7 and the outer shell 21 are connected, and by setting a plurality of adjustment holes 710 on the support column 71, the height of the cooling shell 72 can be adjusted by adjusting the connection fixing position of the connecting rods 79 and the support column 71 according to the size of the specimen, so as to be suitable for specimens of different sizes.

[0025] In one embodiment, the ultrasonic fatigue vibration device 2 includes a housing 21 and a transducer 22 installed in the housing 21 ; the eddy current cooling structure 7 is connected to the housing 21 .

[0026] In one embodiment, it also includes a plurality of air inlets 8 and air outlets 81 disposed on the housing 21 for communicating with the outside world, and a plurality of guide grooves 82 disposed 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; By arranging a plurality of guide grooves 82 in a spiral shape on the inner wall of the shell 21, and the air inlet 8 is connected to the guide groove 82, the gas entering the shell 21 through the air inlet 8 moves along the guide groove 82, thereby performing a spiral motion in the shell 21, thereby improving the cooling comprehensiveness and cooling speed of the transducer 22, thereby improving the cooling effect and increasing the service life of the transducer 22.

[0027] In one embodiment, 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. The guide groove 82 is spirally arranged on the inner wall of the outer shell 21 and is connected to the upper air outlet 85 and the lower air outlet 86. The gas entering the outer shell 21 forms a spiral airflow in the outer shell 21 under the action of the guide groove 82. The transducer 22 is cooled by heat exchange through the spiral airflow and then discharged through the upper air outlet 85 and the lower air outlet 86, and the cooling effect is good.

[0028] Working process of the present invention: The multi-axis alignment platform 3 described below is a conventional adjustment device for adjusting position in the prior art; First, the control system controls the multi-axis alignment platform 3 to adjust the positions of the ultrasonic fatigue vibration device 2 and the drawing test holder 4 so that the two are on the same center line, and then the height of the ultrasonic fatigue vibration device 2 is adjusted by the lifting device 6 according to the size of the test piece; Then one end of the test piece is fixed to the pull-out test holder 4, and the other end is fixedly connected to the ultrasonic fatigue vibration device 2; After moving the heater 5 to the specimen, start the heater 5 to heat the specimen; At the same time, the temperature of the test piece is detected in real time through the infrared temperature sensor and the data is transmitted to the display, and the heating is stopped when the time temperature reaches the set temperature; 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; During the pull-out test, the specimen is monitored online and in real time by scanning electron microscopy; 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. During the drawing test, the temperature of the test piece is monitored in real time by an infrared temperature sensor; 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 the cooling stops; The pulling test is stopped until the scanning electron microscope detects cracks and the specimen is about to break, and the data is transmitted to the display for recording and storage. The operator can check the data on the display to know the number of times the specimen is pulled, and the precise fatigue strength and service life of the specimen; after the test is completed, the specimen can be removed.

[0029] 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, 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 (5) installed in the cabinet (1) for heating the test piece and an infrared temperature sensor for detecting the temperature of 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).

3. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 2, characterized in that: It also includes an eddy current cooling structure (7) arranged on the ultrasonic fatigue vibration device (2) for uniformly cooling the test piece.

4. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 3 is characterized in that: 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 in an inclined manner.

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 blowing joints (75) arranged on the cooling housing (72) for blowing the blades (74) with the transmission gas to drive the rotating disk (73) to rotate, and a plurality of air blowing ports (76) arranged obliquely on the rotating disk (73) to guide the gas so as to evenly blow the gas onto the test piece to evenly cool the test piece.

6. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 5, 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).

7. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 4, 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).

8. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 7, 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).

9. The real-time online monitoring ultra-high cycle fatigue testing machine according to claim 8, 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).

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