A tensile strength testing device under ultra-high temperature oxidation environment

Abstract

The utility model discloses a kind of tensile strength testing devices for ultrahigh temperature oxidation environment, it includes base and the cantilever of being arranged on base, the top of cantilever and the top of base are respectively equipped with the two pull rods of opposite arrangement, and the end of pull rod is respectively equipped with the fixture of being clamped to sample;The horizontal center of cantilever is equipped with the main heating part that is extended to between two fixtures, and the cantilever above and below the main heating part is also respectively equipped with the sub-heating part of sliding up and down;When sample is clamped between two fixtures, the main heating part heats the middle part of sample, and the sub-heating part heats the both ends of sample.It uses the structure of induction heating, heating sample in combination with heating body, and also designed multi-section heating mode, avoid the fracture risk of sample due to temperature difference while ensuring test effect.

Description

Technical Field

[0001] This utility model relates to a tensile strength testing device for materials, specifically a tensile strength testing device for ultra-high temperature oxidation environment. Background Technology

[0002] Tensile strength testing is a test method for testing the properties of materials under axial tensile load. The data obtained from tensile tests can be used to determine the material's elastic limit, elongation, elastic modulus, proportional limit, yield point, and other performance indicators. Tensile tests conducted at high temperatures can also obtain creep data.

[0003] Conventional tensile strength testing is conducted on a dedicated tensile testing machine, mainly used for testing material properties under normal conditions. For materials with special application requirements, it is necessary to add a simulation device for the application scenario, such as high temperature or low temperature scenarios, on the basis of conventional tensile testing. During the tensile test operation, the test sample needs to be heated or cooled accordingly, and the corresponding high temperature or low temperature environment needs to be maintained during the test.

[0004] For tensile strength testing in high-temperature environments, a heating furnace is typically placed around the test sample to maintain a corresponding high temperature during the test. However, for more demanding ultra-high temperature requirements, conventional heating furnaces are insufficient to reach the ultra-high temperature state. The limited number of materials capable of withstanding ultra-high temperatures means the equipment itself cannot meet the requirements. Even if the material itself can withstand the high temperature, the ultra-high temperature environment generally requires a sealed chamber with low oxygen content, creating a relatively oxygen-free environment that cannot fully simulate the material's actual operating environment. Induction heating can also be considered, but this has certain requirements for the test sample material. While this method is suitable for metals, metal-based composite materials may experience uneven heating when directly subjected to induction heating, affecting the actual test results. Furthermore, unstable fractures are prone to occur at the interface between the locally ultra-high temperature of the sample and the relatively low temperature of the clamping part.

[0005] The above-mentioned problems are the shortcomings of current methods for tensile strength testing of metal matrix composites under ultra-high temperature oxidation conditions. Summary of the Invention

[0006] This utility model is a tensile strength testing device for ultra-high temperature oxidation environment. It adopts an induction heating structure and combines a heating element to heat the sample. It also designs a multi-stage heating method to ensure the test effect while avoiding the risk of sample breakage due to temperature difference.

[0007] The present invention adopts the following technical solution: A tensile strength testing device for ultra-high temperature oxidation environment includes a base and a cantilever mounted on the base. The cantilever is an inverted L-shaped structure. Two opposing tie rods are respectively provided at the top of the cantilever and above the base. The ends of the tie rods are respectively provided with clamps for holding the sample. A main heating part is provided at the horizontal center of the cantilever, extending between the two clamps. A secondary heating part that slides up and down is provided on the cantilever above and below the main heating part. When the sample is clamped between the two clamps, the main heating part heats the middle part of the sample, and the secondary heating part heats the two ends of the sample.

[0008] The main heating part includes a bracket and a heating element located at the end of the bracket. The heating element is connected to the cantilever via the bracket. The heating element is an annular tungsten tube and is vertically arranged with its center corresponding to the clamps above and below. An induction coil is provided on the outside of the heating element.

[0009] The auxiliary heating unit includes a support arm and a metal tube at the end of the support arm. A vertically arranged sliding groove is provided on the cantilever, and a slider is provided in the sliding groove. The metal tube is connected to the slider through the support arm. Two symmetrical sets of slider, support arm and corresponding metal tube are provided above and below the main heating unit. An induction coil is provided on the outside of the metal tube. The metal tube and the corresponding induction coil slide up and down in the sliding groove under the drive of the slider. The metal tube and the heating element have a concentric structure.

[0010] Furthermore, the cantilever is also equipped with a sample detection unit, which includes two sets corresponding to each other, and the two sets of sample detection units detect the changes on both sides and front and back of the sample, respectively.

[0011] The sample testing unit includes a bracket with a U-shaped sliding part on one side and a slide rail on the cantilever corresponding to the sliding part. The slide rails correspond to the two ends of the sliding part, and the bracket slides up and down within the slide rails. The bracket has through holes corresponding to the pull rod and the clamp, which pass through the through holes. A testing plate is installed inside the through holes.

[0012] Each detection unit has two detection plates. The through hole is square in structure. The two detection plates are respectively located on opposite sides of the through hole. The detection plates of the upper and lower detection units are located on different sides.

[0013] Furthermore, a mounting base is provided at the edge of the through hole, one end of the detection plate is hinged in the mounting base, and a torsion spring is provided between the detection plate and the mounting base. The torsion spring drives the detection plate to bring its free end closer to the center. The detection plates of the upper and lower detection units correspond to the four sides of the sample respectively. The free ends of the detection plates are provided with columnar sliding columns, which are attached to the surface of the sample. The detection plates and sliding columns are made of ultra-high temperature resistant materials. An angle detection module for detecting the tilt angle of the detection plates is also provided in the mounting base.

[0014] Furthermore, the top and bottom of the heating element are respectively provided with annular air outlet and drainage section, the end face of the air outlet and drainage section are U-shaped structure and are respectively inserted into the top and bottom of the heating element, and the air outlet and drainage section are respectively provided with air guide pipe and drainage pipe.

[0015] The present invention, by adopting the above-described technical solution, has the following beneficial effects: This device employs a combination of main and auxiliary heating elements, which reduces the temperature difference experienced by the sample in practical use, resulting in a relatively small temperature difference and avoiding the risk of sample damage caused by large temperature differences. Furthermore, the device uses an induction coil combined with a high-temperature-resistant heating element to form a non-contact heating structure. While ensuring heating effectiveness, it allows the sample to come into contact with the outside air, creating a normal environment under ultra-high temperature conditions, which effectively guarantees the authenticity of the tested structure. A detection plate is used to collect data on changes in the sample, avoiding the drawbacks of conventional sensors being unable to achieve accurate detection under ultra-high temperature conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention.

[0017] Figure 2 A cross-sectional view of the main heating section.

[0018] Figure 3 This is a schematic diagram of the heating element.

[0019] Figure 4 This is a schematic diagram of the detection unit.

[0020] Figure 5 This is a diagram showing the disassembly of the detection plate and bracket. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the following embodiments are only one or more manifestations of the present invention and are not a complete limitation on the invention content recorded in this application. Any improvements made based on the invention content or technical solution recorded in this application that are known to those skilled in the art should fall within the scope of protection claimed in this application.

[0022] Furthermore, the descriptions of directions such as up, down, left, right, front, and back presented in the specific embodiments are merely for the purpose of describing the technical solutions and are not absolute limitations unless otherwise stated.

[0023] like Figures 1-5The device shown is a tensile strength testing device for ultra-high temperature oxidation environment. It includes a base 1 and a cantilever 2 mounted on the base 1. The cantilever 2 is an inverted L-shaped structure. Two opposing tie rods 301 are respectively provided on the top of the cantilever 2 and the top of the base 1. The ends of the tie rods 301 are respectively provided with clamps 302 for holding the sample. A main heating part 4 is provided at the horizontal center of the cantilever 2, extending between the two clamps 302. A secondary heating part 5 that slides up and down is also provided on the cantilever 2 above and below the main heating part. When the sample is clamped between the two clamps 302, the main heating part 4 heats the middle part of the sample, and the secondary heating part 5 heats the two ends of the sample.

[0024] The main heating part 4 includes a bracket 401 and a heating element 402 disposed at the end of the bracket 401. The heating element 402 is connected to the cantilever 2 through the bracket 401. The heating element 402 is an annular tungsten tube. The heating element 402 is vertically arranged, and the center corresponds to the clamps 302 above and below. A first induction coil 403 is provided on the outside of the heating element 402.

[0025] The auxiliary heating unit 5 includes a support arm 501 and a metal tube 502 located at the end of the support arm 501. A vertically arranged sliding groove 201 is provided on the cantilever 2, and a slider 202 is provided in the sliding groove 201. The metal tube 502 is connected to the slider 202 through the support arm 501. Two symmetrical sets of slider 202, support arm 501 and corresponding metal tube 502 are arranged above and below the main heating unit 4. A second induction coil 503 is provided on the outside of the metal tube 502. The metal tube 502 and the corresponding second induction coil 503 slide up and down in the sliding groove 201 under the drive of the slider 202. The metal tube 502 and the heating element 402 have a concentric structure.

[0026] Furthermore, the cantilever 2 is also provided with a sample detection unit 6, which includes two sets of corresponding units, one above the other, which respectively detect changes on both sides and the other front and back of the sample.

[0027] The sample testing unit 6 includes a bracket 601. A U-shaped sliding part 602 is provided on one side of the bracket 601. A slide rail 203 corresponding to the sliding part 602 is provided on the cantilever 2. The slide rail 203 is respectively corresponding to the two ends of the sliding part 602, and the bracket 601 slides up and down in the slide rail 203. The bracket 601 is provided with a through hole 603 corresponding to the pull rod 301 and the clamp 302. The pull rod 301 and the clamp 302 are provided through the through hole 603. A testing plate 604 is provided in the through hole 603.

[0028] Each detection unit 6 is provided with two detection plates 604. The through hole 603 is a square structure. The two detection plates 604 are respectively located on opposite sides of the through hole 603. The detection plates 604 corresponding to the upper and lower detection units 6 are located on different sides.

[0029] Furthermore, a mounting base 605 is provided at the edge of the through hole 603, one end of the detection plate 604 is hinged in the mounting base 605, and a torsion spring 606 is provided between the detection plate 604 and the mounting base 605. The torsion spring 606 drives the detection plate 604 so that its free end moves towards the center. The detection plates 604 corresponding to the upper and lower sets of detection units 6 are respectively associated with the four sides of the sample. The free ends of the detection plates 604 are respectively provided with columnar sliding columns 608, which are attached to the surface of the sample. The detection plates 604 and sliding columns 606 are made of materials resistant to ultra-high temperatures. An angle detection module 607 for detecting the tilt angle of the detection plates 604 is also provided in the mounting base 605.

[0030] Furthermore, the heating element 402 is provided with annular air outlet 404 and drainage section 405 at its top and bottom, respectively. The end faces of the air outlet 404 and drainage section 405 are U-shaped and are inserted into the top and bottom of the heating element 402, respectively. The air outlet 404 and drainage section 405 are provided with air guide pipe 406 and drainage pipe 407, respectively.

[0031] The tungsten tube structure in the main heating section of this device can achieve ultra-high temperature conditions. In order to ensure the service life of the tungsten tube, an outlet and a drainage section are set up to introduce inert gas into both sides of the tungsten tube wall, which can prevent the tungsten tube from oxidizing during the heating process. This structure does not affect the structure of the sample at the center and the ambient air.

[0032] The heating element on the main heating section heats the sample at the center, while the upper and lower auxiliary heating sections can slide to both ends of the sample to apply high temperature to both ends, forming a gradient cooling structure of ultra-high temperature and high temperature, thus avoiding a large temperature difference between ultra-high temperature and normal temperature.

[0033] The sample testing unit collects information from all four sides of the sample. The sliding part slides within the slide rail, causing the sliding column at the free end of the testing plate to move on the sample. The rotation angle of the testing plate is detected by the angle detection module. When the sample is stretched, both its thickness and width decrease. At this point, the specific data can be calculated from the tilt angle of the testing plate. In practical applications, additional electronic sensors can be combined with this device for data acquisition. However, the measurement results of electronic sensors under ultra-high temperature conditions exhibit some instability; combining both methods can achieve more accurate measurement results.

Claims

1. A tensile strength testing device for ultra-high temperature oxidation environment, characterized in that: It includes a base and a cantilever mounted on the base. The cantilever is an inverted L-shaped structure. Two opposing tie rods are provided at the top of the cantilever and above the base, respectively. The ends of the tie rods are respectively provided with clamps for holding the sample. A main heating part is provided at the horizontal center of the cantilever, extending between the two clamps. A secondary heating part that slides up and down is provided on the cantilever above and below the main heating part. When the sample is clamped between the two clamps, the main heating part heats the middle part of the sample, and the secondary heating part heats the two ends of the sample.

2. The tensile strength testing device for ultra-high temperature oxidation environment according to claim 1, characterized in that: The main heating part includes a bracket and a heating element located at the end of the bracket. The heating element is connected to the cantilever via the bracket. The heating element is an annular tungsten tube and is vertically arranged with its center corresponding to the clamps above and below. An induction coil is provided on the outside of the heating element.

3. The tensile strength testing device for ultra-high temperature oxidation environment according to claim 2, characterized in that: The auxiliary heating unit includes a support arm and a metal tube at the end of the support arm. A vertically arranged sliding groove is provided on the cantilever, and a slider is provided in the sliding groove. The metal tube is connected to the slider through the support arm. Two symmetrical sets of slider, support arm and corresponding metal tube are provided above and below the main heating unit. An induction coil is provided on the outside of the metal tube. The metal tube and the corresponding induction coil slide up and down in the sliding groove under the drive of the slider. The metal tube and the heating element have a concentric structure.

4. The tensile strength testing device for ultra-high temperature oxidation environment according to claim 3, characterized in that: The cantilever is also equipped with a sample detection unit, which includes two sets of corresponding units, one above the other, which detect changes on both sides and the other front and back of the sample.

5. The tensile strength testing device for ultra-high temperature oxidation environment according to claim 4, characterized in that: The sample testing unit includes a bracket with a U-shaped sliding part on one side and a slide rail on the cantilever corresponding to the sliding part. The slide rails correspond to the two ends of the sliding part, and the bracket slides up and down within the slide rails. The bracket has through holes corresponding to the pull rod and the clamp, which pass through the through holes. A testing plate is installed inside the through holes.

6. The tensile strength testing device for ultra-high temperature oxidation environment according to claim 5, characterized in that: Each detection unit has two detection plates. The through hole is square in structure. The two detection plates are respectively located on opposite sides of the through hole. The detection plates of the upper and lower detection units are located on different sides.

7. The tensile strength testing device for ultra-high temperature oxidation environment according to claim 6, characterized in that: A mounting base is provided at the edge of the through hole. One end of the detection plate is hinged in the mounting base, and a torsion spring is provided between the detection plate and the mounting base. The torsion spring drives the detection plate so that its free end moves towards the center. The detection plates of the upper and lower detection units correspond to the four sides of the sample respectively. The free ends of the detection plates are provided with columnar sliding columns, which are attached to the surface of the sample. The detection plates and sliding columns are made of ultra-high temperature resistant materials. An angle detection module is also provided in the mounting base to detect the tilt angle of the detection plate.

8. The tensile strength testing device for ultra-high temperature oxidation environment according to claim 7, characterized in that: The heating element is provided with annular air outlet and drainage section at the top and bottom, respectively. The end face of the air outlet and drainage section is U-shaped and is inserted into the top and bottom of the heating element, respectively. The air outlet and drainage section are provided with air guide pipe and drainage pipe, respectively.

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