CN114965244A - Method for evaluating fatigue performance of magnesium alloy welding joint in corrosive environment - Google Patents
Method for evaluating fatigue performance of magnesium alloy welding joint in corrosive environment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 44
- 238000003466 welding Methods 0.000 title claims abstract description 30
- 238000005260 corrosion Methods 0.000 claims abstract description 46
- 230000007797 corrosion Effects 0.000 claims abstract description 46
- 238000011156 evaluation Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims description 40
- 238000001514 detection method Methods 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 35
- 239000000523 sample Substances 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- 238000009825 accumulation Methods 0.000 description 9
- 239000011780 sodium chloride Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000001931 thermography Methods 0.000 description 2
- 229920000426 Microplastic Polymers 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/267—Welds
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Abstract
The invention provides a method for evaluating fatigue performance of a magnesium alloy welding joint in a corrosion environment, which comprises a base and supporting pads, wherein the supporting pads are fixedly arranged at four corners of the lower surface of the base, one end of the upper surface of the base is fixedly provided with a base plate, and the top end of the base plate is fixedly provided with a display screen. On the other hand, the acoustic emission characteristic information (acoustic energy) can represent the fatigue plasticity damage evolution rule of the magnesium alloy welding joint in the corrosion environment, and the fatigue limit evaluation result is that the actual corrosion fatigue S-N curve fitting results are matched. The fatigue performance of the magnesium alloy welding joint in a liquid corrosion environment can be reliably evaluated through an acoustic emission analysis system, and the method has important significance for safe and reliable application of the magnesium alloy welding joint in the corrosion environment.
Description
Technical Field
The invention relates to the technical field of fatigue performance evaluation of magnesium alloy welding joints, in particular to a fatigue performance evaluation method of a magnesium alloy welding joint in a corrosion environment.
Background
At present, the common evaluation method for the fatigue performance of the magnesium alloy welding joint mainly comprises the following steps: (1) IIW recommends a notch stress method, a structural stress method, a fracture mechanics method and a nominal stress method; (2) finite element numerical simulation local method; (3) x-ray imaging techniques; (4) infrared thermal imaging method. However, these methods have limitations, particularly for components that are in service in corrosive environments. The traditional various stress evaluation methods have long test period, belong to destructive analysis methods and are not suitable for complex components. The numerical simulation local method is to simulate the bearing state of the actual service environment of the component by using finite element software, and the accuracy and the precision are often different from the actual environment and lack of reliability. The X-ray imaging technology adopts X-ray to track the fatigue crack initiation and propagation process of the component, and performs imaging analysis, but the method has high cost and limited light source moving range, and is not suitable for complex components in service in a corrosive environment. Finally, the infrared thermography is used for evaluating and analyzing the fatigue performance by utilizing the surface temperature change in the service bearing deformation process of the component, but the method is not suitable for evaluating and analyzing the service component in a liquid corrosion environment. Comprehensive analysis, the evaluation methods are not suitable for the fatigue performance evaluation of the service component of the magnesium alloy welding joint in the liquid corrosion environment, and the wide and reliable application of the magnesium alloy welding joint is severely limited.
Therefore, there is a need to provide a new method for evaluating fatigue properties of a magnesium alloy welded joint in a corrosive environment to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for evaluating the fatigue performance of a magnesium alloy welding joint in a corrosion environment.
The invention provides a method for evaluating fatigue performance of a magnesium alloy welding joint in a corrosive environment, which is completed by matching a detection mechanism, and comprises the following steps:
(1) and material preparation: firstly, placing a corrosion solution in a corrosion box mechanism by a worker, and then clamping a material to be detected (the geometric shape and the size of a corrosion fatigue sample are 260 multiplied by 20 multiplied by 5mm, and the length of a sample gauge length part is 40 mm) to be detected by a detection mechanism;
(2) and material detection: then, the position of the corrosion box mechanism starts to move upwards, the material to be detected is soaked, the working environment of the material to be detected is simulated, then, the detection equipment starts to work, and the detection mechanism starts to carry out fatigue detection on the material clamped at the clamping end of the detection equipment;
wherein, check out test set in step (2) includes base and supporting pad, and the equal fixed mounting in lower surface four corners of base has the supporting pad, and the upper surface one end fixed mounting of base has the backing plate, and the top fixed mounting of backing plate has the display screen, and the upper surface central authorities fixed mounting of base has detection mechanism, and detection mechanism includes: the servo driving device is characterized in that two mounting bottom plates are arranged on one side of the servo driving device and are respectively and fixedly mounted on the upper surface of the base, a guide rail is fixedly mounted on the upper surface of one of the mounting bottom plates, a sliding seat is connected onto the guide rail in a sliding mode, and a corrosion box mechanism is mounted in the center of the base.
Preferably, the detection mechanism further comprises:
go up anchor clamps, go up anchor clamps fixed mounting at mounting plate's upper surface, interconnect between the one end of going up anchor clamps and servo drive device's the output, another one end fixed mounting that servo drive device was kept away from to mounting plate's upper surface has a fixing base, fixing base one side is installed tension sensor, tension sensor keeps away from one side of fixing base and one side fixed connection of anchor clamps down, mutual sliding connection between anchor clamps and mounting plate's the upper surface down, go up anchor clamps and the equal threaded connection of anchor clamps output down has the threaded rod, the one end of a plurality of threaded rods all runs through the lateral wall rotation that goes up anchor clamps and anchor clamps down and is connected with splint, the equal fixed mounting in upper surface of going up anchor clamps and anchor clamps down has the connecting wire, the equal fixed mounting in one end of two connecting wires has acoustic emission signal acquisition probe.
Preferably, one side of each clamping plate is provided with a protective line.
Preferably, the output ends of the upper clamp and the lower clamp are both arranged in a C shape.
Preferably, the rotating grooves are formed in the ends, far away from the clamping plate, of the threaded rods.
Preferably, the etching box mechanism comprises:
the mounting groove, the mounting groove is seted up at the upper surface central authorities of base, and sliding connection has the bearing box in the upper surface mounting groove of base, and bottom end fixed mounting has the lift cylinder in the mounting groove of base, and the output of lift cylinder rotates and is connected with the connecting block, and the output of lift cylinder passes through the bottom threaded connection of connecting block and bearing box.
Preferably, the lug has all been seted up to the both sides of bearing box, and the use groove has all been seted up to the lug department of bearing box.
Preferably, the bearing box is close to both sides of the upper clamp and the lower clamp and are provided with matching grooves.
Preferably, the bottom center of the bearing box is provided with a threaded lug which is matched with the connecting block.
Preferably, the center of the top end of the connecting block is provided with a thread groove which is matched with the thread lug at the bottom end of the bearing box.
Compared with the related technology, the method for evaluating the fatigue performance of the magnesium alloy welding joint in the corrosive environment has the following beneficial effects:
the invention provides a method for evaluating fatigue performance of a magnesium alloy welding joint in a corrosive environment, which comprises the following steps:
compared with the existing method for evaluating the fatigue performance of the magnesium alloy welding joint, the acoustic emission technology has the unique advantage of monitoring the corrosion fatigue test process in real time on line without damage, particularly permeable to a corrosion environment. On the other hand, the acoustic emission characteristic information (acoustic energy) can represent the fatigue plasticity damage evolution rule of the magnesium alloy welding joint in the corrosion environment, and the fatigue limit evaluation result is that the actual corrosion fatigue S-N curve fitting results are matched. The fatigue performance of the magnesium alloy welding joint in a liquid corrosion environment can be reliably evaluated through an acoustic emission analysis system, and the method has important significance for safe and reliable application of the magnesium alloy welding joint in the corrosion environment.
Drawings
FIG. 1 is a graph of acoustic energy evolution law of a fatigue test of a magnesium alloy welded joint in a 3.5 wt.% NaCl solution corrosive environment;
FIG. 2 is a graph of acoustic energy accumulation for a magnesium alloy weld joint under different fatigue loads in a 3.5 wt.% NaCl solution corrosive environment;
FIG. 3 is a graph of the relationship between the acoustic emission steady-state accumulated energy and different fatigue loads of a magnesium alloy welded joint in a corrosive environment;
FIG. 4 is a fatigue S-N curve of a magnesium alloy welded joint in a corrosive environment;
FIG. 5 is a schematic structural view of a detecting mechanism provided in the present invention;
FIG. 6 is a schematic structural view of an upper clamp and a lower clamp provided by the present invention;
FIG. 7 is a schematic structural diagram of a corrosion chamber according to the present invention;
FIG. 8 is a schematic structural diagram of an etching chamber according to the present invention.
Reference numbers in the figures: 1. a base; 2. a support pad; 3. a base plate; 4. a display screen; 5. a detection mechanism; 6. a servo drive device; 7. mounting a bottom plate; 8. a guide rail; 9. a sliding seat; 10. a corrosion box mechanism; 11. an upper clamp; 12. a fixed seat; 13. a tension sensor; 14. a lower clamp; 15. a threaded rod; 16. a splint; 17. connecting wires; 18. an acoustic emission signal acquisition probe; 19. a rotating groove; 20. mounting grooves; 21. a carrying case; 22. a lifting cylinder; 23. connecting blocks; 24. using a trough; 25. a mating groove; 26. a threaded projection; 27. and (4) a thread groove.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
In the concrete implementation process, as shown in fig. 5 and 6, a method for evaluating the fatigue performance of a magnesium alloy welded joint in a corrosion environment is completed by matching a detection mechanism, and the method for evaluating the fatigue performance is as follows:
(1) and material preparation: firstly, a worker places a corrosion solution in the corrosion box mechanism 10, and then clamps a material to be detected (the geometric shape and the size of a corrosion fatigue sample are 260 multiplied by 20 multiplied by 5mm, and the length of a sample gauge length part is 40 mm) through the detection mechanism 5;
(2) and material detection: then, the position of the corrosion box mechanism 10 starts to move upwards, the material to be detected is soaked, the working environment of the material to be detected is simulated, then, the detection equipment starts to work, and the detection mechanism 5 starts to carry out fatigue detection on the material clamped at the clamping end of the detection equipment;
wherein, the check out test set in step (2) includes base 1 and supporting pad 2, and the equal fixed mounting in lower surface four corners of base 1 has supporting pad 2, and the upper surface one end fixed mounting of base 1 has backing plate 3, and the top fixed mounting of backing plate 3 has display screen 4, and the upper surface central authorities fixed mounting of base 1 has detection mechanism 5, and detection mechanism 5 includes: the corrosion box comprises a servo driving device 6, wherein two mounting bottom plates 7 are arranged on one side of the servo driving device 6, the two mounting bottom plates 7 are respectively and fixedly mounted on the upper surface of a base 1, a guide rail 8 is fixedly mounted on the upper surface of one mounting bottom plate 7, a sliding seat 9 is connected onto the guide rail 8 in a sliding manner, and a corrosion box mechanism 10 is mounted in the center of the base 1.
It should be noted that: when the fatigue evaluation needs to be performed on a material to be detected (the geometric shape and the size of a corrosion fatigue sample is 260 multiplied by 20 multiplied by 5mm, and the length of a sample gauge length part is 40 mm) by using the device, a worker places the material to be detected on the detection mechanism 5, the detection mechanism 5 clamps two ends of the material, and then the corrosion box mechanism 10 starts to ascend (the solution in the corrosion box mechanism 10 adopts 3.5 wt.% NaCl solution to simulate seawater as a corrosion environment), so that the material to be detected is immersed in the corrosion box mechanism 10, at the moment, the detection mechanism 5 starts the fatigue performance evaluation work, and then the detection structure is displayed through the display screen 4.
The processing data is further analyzed and extracted to obtain an evolution law curve of the change of the acoustic energy along with the fatigue cycle life of the magnesium alloy welding joint in a 3.5 wt.% NaCl solution corrosion environment, as shown in figure 1 (sigma max is 100 MPa). It can be seen that, with the increase of the corrosion fatigue cycle life, the fatigue sound energy evolution of the magnesium alloy welding joint in the corrosion environment presents three-stage change characteristics: stage I, generating plastic deformation along with the application of fatigue load at the beginning, and exciting an acoustic emission signal with certain intensity to generate; stage II, then, with the continuous loading of the fatigue load, the fatigue plasticity damage is stably accumulated, the acoustic emission energy generated in the process is relatively stable, and a horizontal segment appears in the acoustic energy evolution law curve; stage III, when fatigue damage is accumulated to a certain limit degree (fracture), which is a stage of rapid accumulation of acoustic energy, a large number of acoustic emission signals are excited
According to the curve of the acoustic energy evolution law of fig. 1, the acoustic energy accumulation law of the first two stages (I, II) of the curve is further analyzed with emphasis. FIG. 2 is a graph showing the acoustic energy buildup for a magnesium alloy weld joint under different fatigue loads in a 3.5 wt.% NaCl solution corrosive environment. It can be seen that, overall, the acoustic emission cumulative energy of a magnesium alloy weld joint in a corrosive environment decreases with decreasing fatigue-applied loads. Along with the application of the fatigue load, the plastic deformation is generated, the acoustic emission signal is excited, the acoustic energy starts to accumulate, and a certain acoustic energy rising stage is formed on the corrosion fatigue acoustic energy accumulation curve of the magnesium alloy welding joint under the action of no fatigue load, and the stage is consistent with the stage I in the figure 1. As the fatigue plastic deformation of the material enters a steady accumulation phase, the acoustic energy also enters a steady accumulation phase, and a horizontal segment appears on the curve, which is consistent with the phase II in fig. 1. Specifically, when the fatigue applied load is lower than a certain value (as shown in fig. 2, when the fatigue load is reduced to 30MPa, the red sound energy accumulation curve is kept horizontal without rising change), the plastic deformation amount of the material is little, and the sound energy accumulation energy is very low (17 mv ms), which is basically kept unchanged.
According to fig. 2, the relationship curve of the steady-state cumulative energy of acoustic emission and different fatigue loads of the magnesium alloy welded joint in a 3.5 wt.% NaCl solution corrosion environment can be obtained, as shown in fig. 3. The steady state sound energy of the magnesium alloy welding joint in a corrosion environment is increased along with the increase of the load (namely a curve C 'D' section) within a certain fatigue application load (40-140 MPa), the plastic deformation of the material is larger at a higher stress level, and the sound energy accumulation is increased. When the fatigue applying load is lower than 40MPa, the material is in a micro plastic deformation stage, and the sound energy hardly changes (namely, the curve B 'C' section). The applied fatigue load corresponding to the fitting intersection point C' is 45.04MPa, and the error is 8.5 percent, which is in good agreement with the fatigue limit (corresponding to the fatigue life of 107 times) measured by an actual test of 41.53MPa (as shown in figure 4). Therefore, the acoustic emission signal characteristic analysis system can be used for evaluating the fatigue performance of the magnesium alloy welding joint in service in a corrosion environment, and has important practical significance for safe and reliable service application of magnesium alloy materials and welding members in the corrosion environment and under the action of alternating load.
In a specific implementation process, as shown in fig. 6, the detection mechanism 5 further includes:
go up anchor clamps 11, go up anchor clamps 11 fixed mounting at mounting plate 7's upper surface, interconnect between the one end of going up anchor clamps 11 and servo drive device 6's output, another so one end fixed mounting that servo drive device 6 was kept away from to mounting plate 7's upper surface has fixing base 12, force sensor 13 is installed to fixing base 12 one side, force sensor 13 keeps away from one side of fixing base 12 and one side fixed connection of lower anchor clamps 14, mutual sliding connection between lower anchor clamps 14 and mounting plate 7's the upper surface, go up anchor clamps 11 and the equal threaded connection of lower anchor clamps 14 output has threaded rod 15, the one end of a plurality of threaded rods 15 all runs through the lateral wall rotation that goes up anchor clamps 11 and lower anchor clamps 14 and is connected with splint 16, the equal fixed mounting in upper surface of going up anchor clamps 11 and lower anchor clamps 14 has connecting wire 17, the equal fixed mounting in one end of two connecting wire 17 has acoustic emission signal acquisition probe 18.
It should be noted that: when the detection mechanism 5 is required to clamp the material to be detected, the servo driving device 6 moves the position of the upper clamp 11, then the material to be detected is clamped by the mutual matching between the upper clamp 11 and the lower clamp 14, then the two acoustic emission signal acquisition probes 18 are respectively attached to the material to be detected, and then the servo driving device 6 starts to adjust the position of the upper clamp 11 and starts to evaluate the fatigue of the material to be detected.
In the specific implementation process, as shown in fig. 6, the protective lines are formed on one side of each of the plurality of clamping plates 16, so that the clamping of the to-be-detected materials is facilitated.
In the specific implementation process, as shown in fig. 6, the output ends of the upper clamp 11 and the lower clamp 14 are both in a C-shaped arrangement, so that a space is reserved for clamping a material to be detected.
In the specific implementation process, as shown in fig. 6, the ends of the plurality of threaded rods 15, which are far away from the clamping plate 16, are all provided with a rotating groove 19, so that the position of the clamping plate 16 can be conveniently adjusted.
In a specific embodiment, as shown in fig. 7 and 8, the etching chamber mechanism 10 includes:
mounting groove 20, mounting groove 20 is seted up at base 1's upper surface central authorities, and sliding connection has bearing box 21 in base 1's the upper surface mounting groove 20, and bottom end fixed mounting has lift cylinder 22 in base 1's the mounting groove 20, and lift cylinder 22's output rotates and is connected with connecting block 23, and lift cylinder 22's output passes through connecting block 23 and bearing box 21's bottom threaded connection.
It should be noted that: after the detection mechanism 5 finishes clamping the material to be detected, at this time, the lifting cylinder 22 starts to work, and ascends to drive the bearing box 21 to ascend, so that the material to be detected is soaked in the bearing box 21, and the working environment where the material to be detected is located is simulated.
In the specific implementation process, as shown in fig. 7 and 8, the two sides of the carrying box 21 are both provided with a bump, and the bump of the carrying box 21 is provided with a use groove 24, so that the carrying box 21 can be conveniently lifted.
In the specific implementation process, as shown in fig. 7 and 8, the two sides of the carrying box 21 close to the upper clamp 11 and the lower clamp 14 are both provided with matching grooves 25, which is convenient for placing the material to be detected.
In the specific implementation process, as shown in fig. 7 and 8, the center of the bottom end of the bearing box 21 is provided with a threaded protrusion 26 which is matched with the connecting block 23, so that the bearing box 21 and the connecting block 23 can be detached conveniently.
In the specific implementation process, as shown in fig. 7 and 8, the center of the top end of the connecting block 23 is provided with a threaded groove 27 which is matched with the threaded projection 26 at the bottom end of the bearing box 21, so that the connection between the bearing box 21 and the connecting block 23 is facilitated.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fatigue performance evaluation method for a magnesium alloy welding joint in a corrosion environment is completed by matching a detection mechanism, and is characterized by comprising the following steps:
(1) and material preparation: the working personnel firstly place the corrosive solution in the corrosion box mechanism (10) and then clamp the corrosive solution through the detection mechanism (5);
(2) and material detection: then, the position of the corrosion box mechanism (10) starts to move upwards, the material to be detected is soaked, the working environment of the material to be detected is simulated, then, the detection equipment starts to work, and the detection mechanism (5) starts to carry out fatigue detection on the material clamped at the clamping end of the detection equipment;
wherein, check out test set in step (2) includes base (1) and supporting pad (2), the equal fixed mounting in lower surface four corners of base (1) has supporting pad (2), its characterized in that, the upper surface one end fixed mounting of base (1) has backing plate (3), the top fixed mounting of backing plate (3) has display screen (4), the upper surface central authorities fixed mounting of base (1) has detection mechanism (5), detection mechanism (5) include: servo drive device (6), one side of servo drive device (6) is equipped with two mounting plate (7), and two mounting plate (7) respectively fixed mounting at the upper surface of base (1), one of them the last fixed surface of mounting plate (7) installs guide rail (8), sliding connection has sliding seat (9) on guide rail (8), the central authorities of base (1) install and corrode case mechanism (10).
2. The method for evaluating fatigue properties of a magnesium alloy welded joint in a corrosive environment according to claim 1, wherein the detecting means (5) further comprises:
the upper fixture (11) is fixedly arranged on the upper surface of the mounting base plate (7), one end of the upper fixture (11) is connected with the output end of the servo driving device (6), the other end of the upper surface of the mounting base plate (7) far away from the servo driving device (6) is fixedly provided with a fixed seat (12), one side of the fixed seat (12) is provided with a tension sensor (13), one side of the tension sensor (13) far away from the fixed seat (12) is fixedly connected with one side of a lower fixture (14), the lower fixture (14) is slidably connected with the upper surface of the mounting base plate (7), the output ends of the upper fixture (11) and the lower fixture (14) are both in threaded connection with a threaded rod (15), and one ends of a plurality of the threaded rods (15) penetrate through the side walls of the upper fixture (11) and the lower fixture (14) and are rotatably connected with a clamping plate (16), the upper surface of the upper clamp (11) and the upper surface of the lower clamp (14) are both fixedly provided with connecting wires (17), and one ends of the connecting wires (17) are both fixedly provided with acoustic emission signal acquisition probes (18).
3. The method for evaluating the fatigue performance of the magnesium alloy welded joint in the corrosive environment according to claim 2, wherein one side of each of the plurality of clamping plates (16) is provided with a protective line.
4. The method for evaluating the fatigue performance of the magnesium alloy welding joint in the corrosive environment according to claim 2, wherein the output ends of the upper clamp (11) and the lower clamp (14) are arranged in a C shape.
5. The method for evaluating the fatigue performance of the magnesium alloy welded joint in the corrosive environment according to claim 2, wherein the ends of the threaded rods (15) far away from the clamping plate (16) are provided with rotating grooves (19).
6. The method for evaluating fatigue properties of a magnesium alloy welded joint in a corrosive environment according to claim 1, wherein said corrosion case mechanism (10) comprises:
mounting groove (20), the upper surface central authorities at base (1) are seted up in mounting groove (20), sliding connection has bearing box (21) in upper surface mounting groove (20) of base (1), bottom end fixed mounting has lift cylinder (22) in mounting groove (20) of base (1), the output of lift cylinder (22) rotates and is connected with connecting block (23), the output of lift cylinder (22) passes through the bottom threaded connection of connecting block (23) and bearing box (21).
7. The method for evaluating the fatigue performance of the magnesium alloy welded joint in the corrosive environment according to claim 6, wherein the bearing box (21) is provided with bumps at both sides, and the bearing box (21) is provided with service grooves (24) at the bumps.
8. The method for evaluating the fatigue performance of the magnesium alloy welding joint in the corrosive environment according to claim 6, wherein the two sides of the bearing box (21) close to the upper clamp (11) and the lower clamp (14) are respectively provided with a matching groove (25).
9. The method for evaluating the fatigue performance of the magnesium alloy welding joint in the corrosive environment according to claim 6, wherein a threaded bump (26) matched with the connecting block (23) is formed in the center of the bottom end of the bearing box (21).
10. The method for evaluating the fatigue performance of the magnesium alloy welding joint in the corrosive environment according to claim 6, wherein the center of the top end of the connecting block (23) is provided with a threaded groove (27) which is matched with the threaded lug (26) at the bottom end of the bearing box (21).
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