Micro-power biaxial micro-sample long-time mechanical property testing device in corrosion environment

Abstract

The invention relates to a micro-power biaxial micro-sample long-time mechanical property testing device in a corrosion environment. The micro-power biaxial micro-sample long-time mechanical property testing device comprises a container with an opening in the top; the sample is arranged in the container; a plurality of pull-out mechanisms are arranged outside the container, and pull rods penetrate through the side wall of the container and are connected with the end part of the sample; the locking force locking mechanism is arranged between the corresponding outward pulling mechanism and the side wall of the container, and after the pull rod of the outward pulling mechanism pulls the sample outwards, the locking force locking mechanism locks the pulling force of the pull rod on the sample; the DIC observation device is arranged at the opening of the container; when a mechanical test is carried out, the device can act in two directions at the same time, compared with a traditional hydraulic servo single-shaft stretching system, the device ingeniously combines a spring and a stepping motor to form micro-power stretching, the corrosion environment of raw materials in service is highly reduced, and the service life of the raw materials is prolonged. The material can be subjected to long-time mechanical testing under the condition of almost zero energy consumption, the result is closer to the real condition, and meanwhile, the energy consumption of the device can be reduced by arranging the locking force locking mechanism.

Description

Technical Field

[0001] The invention relates to a sample mechanical testing device, in particular to a micro-dynamic biaxial micro-sample long-time mechanical performance testing device under a corrosive environment. Background Art

[0002] In fields such as aerospace, weapons and defense, and automotive manufacturing, equipment materials are subjected to long-term operation in extreme environments, inevitably subjecting them to cracks, fatigue, and other damage, which can reduce equipment safety. When equipment fails to meet operational requirements, it can lead to failure. Failure to promptly identify potential hazards can compromise safety, and premature replacement increases company costs. Therefore, to maximize the use of equipment, simulation of the material's service environment is crucial to estimate equipment life and explore more suitable materials. However, traditional mechanical testing devices have the following shortcomings:

[0003] 1. Single loading direction: It can only simulate uniaxial tension and cannot restore the biaxial stress state of the material in actual service.

[0004] 2. Strong dependence on power: Most equipment uses motors or hydraulic drives, which consumes high energy and is expensive during long-term testing;

[0005] 3. Insufficient environmental simulation: Traditional devices have the problem of limited coupling testing in extreme environments, and the comprehensive simulation technology for complex service environments such as corrosion and temperature is not mature.

[0006] 4. The experimental results are not intuitive: the data collection and analysis are not real-time enough, and the strain distribution diagram cannot be directly drawn. The subsequent data collection and analysis are more troublesome.

[0007] 5. High system complexity and cost: The independent design of conventional dual-axis drive units results in a bloated structure, large footprint, and high maintenance costs.

[0008] Therefore, developing a testing device with low energy consumption, dual-axis synchronous loading, and the ability to intuitively analyze data results has become an urgent problem that researchers in this field need to solve. Summary of the Invention

[0009] The technical problem to be solved by the present invention is: how to realize biaxial detection of a sample and reduce energy consumption during detection.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0011] The present invention is a micro-dynamic biaxial micro-sample long-term mechanical property testing device under a corrosive environment, comprising: a container with an open top; a sample arranged in the container; a plurality of external pulling mechanisms arranged outside the container, wherein the pull rods thereof pass through the side wall of the container and are connected to the ends of the sample; a locking force locking mechanism arranged between the corresponding external pulling mechanisms and the side wall of the container, wherein after the pull rods of the external pulling mechanisms pull the sample outward, the locking force locking mechanism locks the pulling force of the pull rods on the sample; and a DIC observation device arranged at the opening of the container and suitable for taking pictures of the sample while in service.

[0012] Furthermore, the external pulling mechanism includes: a load sensor, which is fixed on the outer wall of the container, and the middle part of which is for the pull rod to pass through; a force plate, which is arranged on the outside of the load sensor and connected to the detection end of the load sensor; a spring, which is sleeved on the pull rod, and one end of which abuts against the force plate; a stepper motor, which is connected to the pull rod; and a support plate, which is fixed on one side of the stepper motor and abuts against the other end of the spring.

[0013] Furthermore, the locking force locking mechanism includes: a fixed disk, which is fixed at the side wall of the stepper motor and is connected to the support disk through a plurality of support columns; a plurality of spaced contraction clips arranged around the pull rod, and the end surface of the fixed disk is provided with the contraction clips extending toward the support disk; a sleeve, which is fixed on the fixed disk; a contraction fixing sleeve, which is located radially outside the plurality of contraction clips and is connected to the sleeve through a contraction assembly; when the contraction assembly works, it drives the contraction fixing sleeve to move toward the sleeve, gathers the plurality of contraction clips and holds the pull rod tightly.

[0014] Furthermore, the contraction component is a micro hydraulic press.

[0015] Furthermore, a through hole is opened on the side wall of the container, a sealing ring is arranged in the through hole, and the pull rod passes through the through hole and is sealed and connected to the through hole.

[0016] Furthermore, a discharge port is provided at the bottom of the container.

[0017] Furthermore, the end of the sample is a trapezoidal piece, and one end of the pull rod located in the container is provided with a trapezoidal groove matching the trapezoidal piece; the pressing sheet is detachably fixed to the end of the sample located in the container.

[0018] The beneficial effects of the present invention are as follows: the present invention is a micro-power biaxial micro-specimen long-term mechanical performance testing device under a corrosive environment. When conducting mechanical tests, it can act in two directions simultaneously. Compared with the traditional hydraulic servo uniaxial stretching system, the present invention not only cleverly combines the spring and the stepper motor to form micro-power stretching, but also highly restores the corrosive environment when the material is in service, so that the material can complete long-term mechanical testing under conditions of almost zero energy consumption, making the results closer to the actual situation. At the same time, the provision of a locking force locking mechanism can reduce the energy consumption of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1 is a top view of the device;

[0021] Figure 2 is a three-dimensional diagram of the device;

[0022] Figure 3 This is the coordination diagram of the external pulling mechanism and the locking force locking mechanism;

[0023] Figure 4 It is a structural diagram of the fixed disk in the locking mechanism;

[0024] Figure 5 It is a structural diagram of the sleeve in the locking force locking mechanism;

[0025] Figure 6 It is a structural diagram of the container. DETAILED DESCRIPTION

[0026] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0027] See also Figure 1 , Figure 1 This is a top view of the device. In the figure, a sample 01 is placed in the container 1. The sample 01 is a cross structure. Corrosive liquid can be injected into the container 1 to simulate the situation where the sample is in a corrosive environment.

[0028] Four external pulling mechanisms 2 are respectively arranged on the upper, lower, left and right sides of the container 1. The pull rod 21 of the external pulling mechanism 2 passes through the side wall of the container 1 and is connected to the end of the sample 01; the external pulling mechanism 2 controls the outward pulling of the sample 01. For example, the external pulling mechanism 2 on the left controls the left end of the sample 01 to pull to the left to simulate the service conditions of the sample in a corrosive environment.

[0029] A locking force locking mechanism 3 is provided between the external pulling mechanism 2 and the container 1. Through the locking force locking mechanism 3, when the external pulling mechanism 2 pulls the sample 01 outward, the locking force locking mechanism 3 will lock the pulling force of the pull rod 21, even if the external pulling mechanism 2 does not act on the pull rod 21. This can reduce the energy consumption generated by the external pulling mechanism 2 due to the continuous generation of pulling force.

[0030] See also Figure 2 , Figure 2 This is a three-dimensional diagram of the device. A DIC observation device 4 is installed directly above the sample 01. The DIC observation device 4 is connected to the side wall of the container 1 through a frame. The DIC observation device 4 is used to take pictures of the sample 01 at certain time intervals and transmit the pictures to a computer program. The computer program analyzes and fits the pictures to form a strain field distribution diagram.

[0031] See also Figure 3 , Figure 3 This is a structural diagram of the outward pulling mechanism 2 and the locking force locking mechanism 3 on the left side of the device. In the figure, the locking force locking mechanism 3 is located between the container 1 and the outward pulling mechanism 2.

[0032] See also Figure 2 、 Figure 3 One end of the pull rod 21 in the external pulling mechanism 2 is connected to the sample 01, and the other end is connected to the stepper motor 22. The load sensor 23 is fixed on the side wall of the container 1. The detection end of the load sensor 23 is connected to the force disk 24. The stepper motor 22 is provided with a support disk 25 at the end close to the container 1, and a spring 26 is provided between the support disk 25 and the force disk 24; when the stepper motor 22 is started, the stepper motor 22 will move the support disk 25 close to the force disk 24 under the reaction force of the pull rod 21. At this time, the spring 26 is under pressure, and the spring 26 needs to release the elastic force, and at this time it drives the corresponding end of the sample 01 to be pulled outward.

[0033] The locking mechanism 3 includes a fixed plate 31, which is fixed to the side wall of the stepper motor 22. A support column 32 is provided between the fixed plate 31 and the support plate 25. Figure 4 The fixed plate 31 extends to the right and is provided with a retractable clip 33, which is arranged at intervals around the pull rod 21. When the locking force locking mechanism 3 is not working, the retractable clip 33 does not act on the pull rod 21. At this time, the pull rod 21 can move freely relative to the retractable clip 33.

[0034] See also Figure 5 The sleeve 34 in the locking force locking mechanism 3 is fixed on the fixed disk 31; the shrinkage fixing sleeve 35 is located radially outside the multiple shrinkage clips 33 and is connected to the sleeve 34 through a shrinkage component 36, and the shrinkage component 36 can adopt a micro hydraulic press.

[0035] The contraction component 36 is started to move the contraction fixing sleeve 35 closer to the sleeve 34. At this time, the contraction clip 33 is deformed inward and holds the pull rod 21 under the translation of the contraction fixing sleeve 35, limiting the axial movement of the pull rod 21. At this time, when the stepper motor 22 does not act on the pull rod, it can also keep the pull rod 21 in a relative position. The spring 26 needs to release the elastic force to continue to generate tension on the sample 01.

[0036] See also Figure 3 In the figure, the end of the pull rod 21 is flat, and a trapezoidal groove 211 is opened at the flat position. The trapezoidal part 02 at the end of the sample 01 is placed in the trapezoidal groove 211. A pressing piece 212 is set at the end of the pull rod 21. The pressing piece 212 is detachably fixed on the end face of the trapezoidal groove 211 to limit the detachment of the trapezoidal part 02 and the trapezoidal groove 211.

[0037] See also Figure 6 , Figure 6 Schematic diagram of the structure of the container, in which the container 1 is an open rectangular structure, a through hole 11 is provided on the side wall of the container 1, and when the pull rod 21 passes through the through hole 11, it is connected to the through hole 11 through a sealing ring, thereby preventing the leakage of the corrosive liquid in the container 1; a discharge port 13 is provided at the bottom of the container 1, which is convenient for discharging the corrosive liquid in the container 1 and adjusting the liquid level of the corrosive liquid.

[0038] It should be noted that when the external pulling mechanism 2 works on the pull rod 21, the load sensor 23 will detect the elastic force generated by the compression of the spring 26; subsequently, the pull rod 21 is driven to remain relatively stationary through the locking force locking mechanism 3. After a certain period of time, when the elastic force value detected by the load sensor 23 decreases by 5%, the locking force locking mechanism 3 is unlocked, and the external pulling mechanism 2 continues to work to control the elastic force value to recover. This cycle continues until the material breaks. During this process, the DIC observation device takes pictures of the sample at intervals.

[0039] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. Micro-dynamic biaxial micro-specimen long-term mechanical properties test device under corrosive environment, characterized by: include: A container with an open top; a sample disposed in the container; A plurality of external pulling mechanisms, which are arranged outside the container, and whose pulling rods pass through the side wall of the container and are connected to the ends of the specimens; A locking force locking mechanism is provided between the corresponding external pulling mechanism and the side wall of the container. After the pull rod of the external pulling mechanism pulls the sample outward, the locking force locking mechanism locks the pulling force of the pull rod on the sample. A DIC observation device is arranged at the opening of the container and is suitable for taking pictures of the sample during service.

2. The micro-dynamic biaxial micro-specimen long-term mechanical properties testing device under a corrosive environment according to claim 1 is characterized in that: The external pulling mechanism comprises: a load sensor fixed to the outer wall of the container, with the tie rod passing through the middle thereof; a force-bearing plate, which is arranged outside the load sensor and connected to the detection end of the load sensor; a spring, which is sleeved on the pull rod and has one end in contact with the force-bearing disk; a stepping motor connected to the pull rod; A supporting plate is fixed on one side of the stepping motor and abuts against the other end of the spring.

3. The micro-dynamic biaxial micro-specimen long-term mechanical properties testing device under a corrosive environment according to claim 2 is characterized in that: The locking force locking mechanism comprises: A fixed plate, which is fixed to the side wall of the stepping motor and is connected to the supporting plate via a plurality of supporting columns; A plurality of spaced contraction clips are arranged around the pull rod, and the contraction clips are extended from the end surface of the fixed plate toward the support plate; a sleeve fixed on the fixed disk; a shrinkage fixing sleeve, located radially outside the plurality of shrinkage clips and connected to the sleeve via a shrinkage assembly; The shrinking assembly works to drive the shrinking fixing sleeve to move toward the sleeve, so as to gather the plurality of shrinking clips and hold the pull rod tightly.

4. The micro-dynamic biaxial micro-specimen long-term mechanical properties testing device under a corrosive environment according to claim 3 is characterized in that: The contraction component is a micro hydraulic press.

5. The micro-dynamic biaxial micro-specimen long-term mechanical properties testing device under a corrosive environment according to claim 1 is characterized in that: A through hole is opened on the side wall of the container, a sealing ring is arranged in the through hole, and the pull rod passes through the through hole and is sealed and connected to the through hole.

6. The micro-dynamic biaxial micro-specimen long-term mechanical properties testing device under a corrosive environment according to claim 1 is characterized in that: The bottom of the container is provided with a discharge port.

7. The micro-dynamic biaxial micro-specimen long-term mechanical properties testing device under a corrosive environment according to claim 1 is characterized in that: The end of the sample is a trapezoidal piece, and one end of the pull rod located in the container is provided with a trapezoidal groove matching the trapezoidal piece; the pressing sheet is detachably fixed to the end of the sample located in the container.

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