Miniature creep test sample detection clamp device and creep testing machine
By designing a micro creep specimen testing fixture device, the deformation of the micro specimen is directly measured using an extensometer and fixture assembly, which solves the problem of large indirect measurement error in traditional creep testing machines and achieves higher measurement accuracy and stability.
Patent Information
- Application Number
- CN202422888490.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Traditional creep testing machines use lead-out rods for indirect measurement, which has the problem of large errors, especially when testing small-sized structures or miniature samples, where the measurement is not accurate enough.
A micro creep specimen testing fixture device is designed, including an extensometer and a fixture assembly. The fixture assembly clamps and fixes both ends of the micro creep specimen, and the extensometer directly measures the deformation of the test section, avoiding the indirect measurement method of the lead-out rod.
By fixing the specimens with a fixture assembly and directly measuring them with an extensometer, the measurement accuracy of micro creep specimens is improved and errors are reduced, making them suitable for long-term testing of oxidation-sensitive materials.
Smart Images
Figure CN223664397U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of creep detection technology, and in particular to a micro creep sample testing fixture device and a creep testing machine. Background Technology
[0002] A creep testing machine is a device used to study the deformation behavior of materials under prolonged high temperature and constant stress, in order to evaluate the deformation characteristics of materials under long-term loads. Its main purpose is to assess the durability and stability of materials under specific conditions, and it is widely used in aerospace, energy, and engineering fields. Creep tests are typically conducted over a relatively long period of time, measuring the amount of deformation of the material by applying a constant load and at a constant temperature.
[0003] The basic principle of creep testing: Creep testing is usually carried out under constant temperature and constant stress conditions to record the deformation behavior of materials over time.
[0004] Structure of the creep testing machine:
[0005] Loading System: The core of a creep testing machine is the loading system, which provides a constant load to the specimen. Loading systems are mainly divided into two types: weight loading and electronic loading. Weight loading is used in mechanical creep testing machines, while electronic loading is used in electronic creep testing machines.
[0006] Loading systems: For mechanical creep testing machines, stress is applied by the gravity of weights. This method is simple in structure and suitable for long-term stability testing, but manual operation is required when changing the load. For electronic creep testing machines, motors and sensors provide precise, constant loads, making them suitable for creep tests requiring high load control accuracy. They are typically integrated with automatic control systems.
[0007] Temperature control system: The temperature control system maintains a constant temperature in the test environment, usually by resistance heating.
[0008] Lead-out rod and clamp: The lead-out rod transmits the force applied by the loading system to the specimen. The clamp is used to fix the specimen and is usually made of high-temperature resistant material to ensure stability and centering at high temperatures.
[0009] Deformation measurement system: used to measure the amount of deformation of a specimen during creep. Traditional systems measure indirectly through an extension rod.
[0010] Data acquisition system: Real-time acquisition and recording of stress, strain and temperature data, generating creep curves.
[0011] Traditional creep testing machines typically use an indirect measurement method with lead-out rods, which reflects creep deformation by measuring the displacement difference between the two ends of the specimen. This indirect measurement method works well for specimens of standard size, but it has certain limitations when testing small structures or miniature specimens.
[0012] Among the patents related to micro-creep testing in China over the past decade, the "Micro-sample Creep Testing System and Method" from the National Energy Group New Energy Technology Research Institute Co., Ltd. is quite typical. This invention belongs to the field of mechanical testing technology and provides a system and method for improving the testing accuracy of micro-creep samples through specific environmental treatment. The system mainly includes a test chamber, a main controller, an environmental treatment device, and a creep testing machine placed inside the chamber. During the test, the main controller is connected to the testing machine through the chamber's wiring harness channel, while the environmental treatment device utilizes the airflow channels inside the chamber to perform vacuuming or inject inert gas into the chamber before the test.
[0013] The main innovation of this method lies in the introduction of a vacuum or inert gas environment within the test chamber, which reduces the risk of oxidation of micro-samples during long-term testing, thereby improving the accuracy of the test results. Furthermore, the chamber seal employs a simple static seal design, making equipment maintenance convenient and reducing equipment costs. This design allows micro-creep samples to be tested for extended periods in a more stable environment, making it suitable for studying the creep properties of oxidation-sensitive materials.
[0014] However, the implementation of this invention is based on a systematic modification of the traditional creep testing machine, which adds many accessories (such as sealed chambers, airflow channels, vacuum equipment, etc.), resulting in high modification costs and complexity. Furthermore, it cannot solve the error caused by indirect measurement using lead-out rods. Utility Model Content
[0015] The technical problem to be solved by this utility model embodiment is the large error in the indirect measurement method of traditional creep testing machine using lead-out rods.
[0016] To address the aforementioned problems, in a first aspect, this utility model provides a micro creep specimen testing fixture for testing micro creep specimens, wherein the micro creep specimen includes a test section; the micro creep specimen testing fixture includes an extensometer and a fixture assembly, the fixture assembly clamping and fixing both ends of the micro creep specimen; the extensometer is disposed on one side of the test section of the micro creep specimen, and the extensometer is used to measure the deformation of the test section of the micro creep specimen.
[0017] A further technical solution is that the micro creep specimen also includes two clamping sections, which are respectively located at both ends of the test section.
[0018] A further technical solution is that the clamping assembly includes two clamps, which respectively clamp the two clamping sections of the micro creep sample.
[0019] A further technical solution is that one end of the fixture is provided with a clamping groove, and the clamping section of the micro creep sample is embedded in the clamping groove.
[0020] A further technical solution is that the fixture also includes two pin holes, which are respectively opened on the two side walls of the clamping groove, and the axes of the two pin holes are collinear.
[0021] A further technical solution is that the clamping section of the micro creep specimen is provided with a fixing hole, and when the clamping section of the micro creep specimen is embedded in the clamping groove, the fixing hole is aligned with the two pin holes of the fixture.
[0022] A further technical solution is that the clamp also includes a pin, which passes through the two pin holes and the fixing hole.
[0023] A further technical solution is that the extensometer includes two measuring rods, one end of which contacts both sides of the test section of the micro creep specimen.
[0024] Secondly, this utility model provides a creep testing machine, which includes a micro creep sample testing fixture device as described in the first aspect.
[0025] A further technical solution is that the creep testing machine also includes a loading system, which is connected to the two clamps of the clamping assembly. The loading system is used to provide a constant load for the micro creep specimen.
[0026] Compared with the prior art, the technical effects achieved by the embodiments of this utility model include:
[0027] In the technical solution of this utility model embodiment, the micro creep specimen testing fixture device includes an extensometer and a fixture assembly. The fixture assembly clamps and fixes both ends of the micro creep specimen. The extensometer is disposed on one side of the test section of the micro creep specimen and is used to measure the deformation of the test section of the micro creep specimen. The fixture assembly can reliably fix both ends of the micro creep specimen, and the extensometer can directly measure the deformation of the test section of the micro creep specimen, which is more accurate and effectively avoids the problem of large errors caused by indirect measurement using an extender rod. Attached Figure Description
[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.
[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0031] Figure 1 This is a schematic diagram of the structure of a micro creep sample testing fixture device proposed in an embodiment of the present invention;
[0032] Figure 2 This is a schematic diagram of the structure of a fixture for a micro creep sample testing fixture device according to an embodiment of the present invention;
[0033] Figure 3 This is a schematic diagram of the pin structure of a micro creep sample testing fixture device according to an embodiment of the present invention;
[0034] Figure 4 This is a schematic diagram of the structure of a micro creep sample used in a micro creep sample testing fixture device proposed in an embodiment of this utility model.
[0035] Figure 5 This is a schematic diagram of the extensometer of a miniature creep sample testing fixture device proposed in an embodiment of this utility model.
[0036] Figure Labels
[0037] Miniature creep specimen 10, test section 11, clamping section 12, fixing hole 13, extensometer 20, measuring rod 21, clamping assembly 30, clamp 31, pin 32, clamping groove 311, pin hole 312. Detailed Implementation
[0038] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Similar component reference numerals in the drawings represent similar components. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0039] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.
[0040] It should also be understood that the terminology used in this specification of embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the present invention. As used in this specification of embodiments of the present invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0041] See Figures 1-5 This utility model provides a micro creep specimen testing fixture device, which can accurately measure the deformation of the micro creep specimen 10 during creep testing, avoiding the errors associated with indirect measurement using the lead-out rod 21. To achieve the above technical objective, the micro creep specimen testing fixture device includes an extensometer 20 and a fixture assembly 30, the specific structure of which is described below:
[0042] The micro creep specimen 10 is the specimen to be tested. The micro creep specimen 10 includes a test section 11. The test section 11 is located in the middle of the micro creep specimen 10. The micro creep specimen 10 can specifically be a specimen of an aero-engine blade.
[0043] In this embodiment of the invention, due to the size limitations of thin-walled components such as blades, conventional standard creep specimens cannot be used, while the creep performance of blades is crucial to the performance of aero-engines. This invention designs a miniature creep specimen 10 specifically for the dimensional characteristics of thin-walled components such as blades. The miniature creep specimen 10 includes a test section 11. The test section 11 is located in the middle of the miniature creep specimen 10, and this test section 11 is the part whose deformation needs to be measured.
[0044] In this embodiment of the present invention, the clamping assembly 30 clamps and fixes the two ends of the micro creep specimen 10; the clamping assembly 30 is used to fix the two ends of the micro creep specimen 10, and the loading system provides a constant force to the micro creep specimen 10.
[0045] The extensometer 20 is disposed on one side of the test section 11 of the micro creep specimen 10, and the extensometer 20 is used to measure the deformation of the test section 11 of the micro creep specimen 10.
[0046] The extensometer 20 may specifically be a high-temperature extensometer 20, used to accurately measure the deformation of the test section 11 of the micro creep specimen 10 at high temperatures.
[0047] In the technical solution of this utility model embodiment, the micro creep specimen testing fixture device includes an extensometer 20 and a fixture assembly 30. The fixture assembly 30 clamps and fixes both ends of the micro creep specimen 10. The extensometer 20 is disposed on one side of the test section 11 of the micro creep specimen 10, and the extensometer 20 is used to measure the deformation of the test section 11 of the micro creep specimen 10. The fixture assembly 30 can reliably fix both ends of the micro creep specimen 10, and the extensometer 20 can directly measure the deformation of the test section 11 of the micro creep specimen 10, which is more accurate and effectively avoids the problem of large errors in indirect measurement by using an extender rod.
[0048] Furthermore, in some embodiments, such as this embodiment, the micro creep specimen 10 further includes two clamping sections 12, which are respectively disposed at both ends of the test section 11.
[0049] Specifically, the two clamping sections 12 of the micro creep specimen 10 are located at both ends of the test section 11 and are integrally formed with the test section 11. The width of the clamping section 12 is greater than the width of the test section 11 so as to facilitate reliable clamping by the clamp 31.
[0050] Furthermore, the clamping assembly 30 includes two clamps 31, which respectively clamp the two clamping segments 12 of the micro creep specimen 10.
[0051] By using two clamps 31 to clamp the two clamping sections 12 of the micro creep specimen 10 respectively, reliable fixation of the two clamping sections 12 of the micro creep specimen 10 can be achieved.
[0052] Furthermore, one end of the clamp 31 is provided with a clamping groove 311, and the clamping section 12 of the micro creep sample 10 is embedded in the clamping groove 311. The clamping groove 311 may be specifically located on the line of symmetry of the end of the clamp 31. The depth of the clamping groove 311 matches the length of the clamping section 12.
[0053] Furthermore, the clamp 31 also includes two pin holes 312, which are respectively opened on the two side walls of the clamping groove 311, and the axes of the two pin holes 312 are collinear.
[0054] Specifically, the two pin holes 312 are spatially aligned, meaning their axes are collinear. The two pin holes 312 are used for the insertion pin 32 to pass through.
[0055] Furthermore, the clamping section 12 of the micro creep specimen 10 is provided with a fixing hole 13. When the clamping section 12 of the micro creep specimen 10 is embedded in the clamping groove 311, the fixing hole 13 is aligned with the two pin holes 312 of the clamp 31.
[0056] Specifically, the fixing hole 13 is located in the middle of the clamping section 12, and the fixing hole 13 is also used for the pin 32 to pass through.
[0057] Furthermore, the clamp 31 also includes a pin 32, which passes through the two pin holes 312 and the fixing hole 13.
[0058] Specifically, the clamping section 12 can be fixed by passing the pin 32 through the two pin holes 312 and the fixing hole 13. The outer diameter of the pin 32 matches the diameter of the two pin holes 312 and the fixing hole 13 to prevent the pin 32 from wobbling within the two pin holes 312 and the fixing hole 13.
[0059] For thin-walled components such as blades, it is difficult to fix them by clamping due to their thinness. Therefore, in this embodiment of the invention, a fixing hole 13 is provided in the clamping section 12 of the micro creep sample 10 and two pin holes 312 are provided on the clamp 31. The micro creep sample 10 is fixed by passing a pin 32 through the two pin holes 312 and the fixing hole 13, thereby solving the problem that the micro creep sample 10 is too thin to be fixed by clamping.
[0060] Furthermore, the extensometer 20 includes two measuring rods 21, one end of which contacts both sides of the test section 11 of the miniature creep specimen 10. The two measuring rods 21 abut against both sides of the test section 11 of the miniature creep specimen 10, thereby enabling accurate measurement of the deformation of the test section 11 during the creep test.
[0061] This utility model provides a creep testing machine, which includes a micro creep sample testing fixture device as described in any of the above embodiments.
[0062] Furthermore, the creep testing machine also includes a loading system connected to the two clamps 31 of the clamp assembly 30. The loading system provides a constant load to the micro-creep specimen 10. This constant load ensures the accuracy of the creep test.
[0063] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0064] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0066] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.
[0069] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
[0070] The above description describes specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.
Claims
1. A micro creep sample testing fixture device, characterized in that, The device is used to test micro-creep specimens, the micro-creep specimens including test sections; the micro-creep specimen testing fixture includes an extensometer and a fixture assembly, the fixture assembly clamping and fixing both ends of the micro-creep specimen; the extensometer is located on one side of the test section of the micro-creep specimen, the extensometer being used to measure the deformation of the test section of the micro-creep specimen.
2. The micro creep sample testing fixture device according to claim 1, characterized in that, The micro creep specimen also includes two clamping sections, which are respectively located at both ends of the test section.
3. The micro creep sample testing fixture device according to claim 2, characterized in that, The clamping assembly includes two clamps, each clamping one of the clamping segments of the micro creep specimen.
4. The micro creep sample testing fixture device according to claim 3, characterized in that, One end of the fixture is provided with a clamping groove, and the clamping section of the micro creep specimen is embedded in the clamping groove.
5. The micro creep sample testing fixture device according to claim 4, characterized in that, The fixture also includes two pin holes, which are respectively opened on the two side walls of the clamping groove, and the axes of the two pin holes are collinear.
6. The micro creep sample testing fixture device according to claim 5, characterized in that, The clamping section of the micro creep specimen has a fixing hole. When the clamping section of the micro creep specimen is embedded in the clamping groove, the fixing hole is aligned with the two pin holes of the fixture.
7. The micro creep sample testing fixture device according to claim 6, characterized in that, The clamp also includes a pin that passes through the two pin holes and the fixing hole.
8. The micro creep sample testing fixture device according to claim 1, characterized in that, The extensometer includes two measuring rods, one end of which contacts both sides of the test section of the micro creep specimen.
9. A creep testing machine, characterized in that, Includes the micro creep sample testing fixture device as described in any one of claims 1-8.
10. The creep testing machine according to claim 9, characterized in that, The creep testing machine also includes a loading system connected to two clamps of the clamping assembly, which is used to provide a constant load for the micro creep specimen.