A testing device for non-standard micro-size creep deformation
By designing a testing device that includes a tie rod, a creep clamp head, and a detection part, and using a force sensor and a grating ruler for precise measurement, the problem of traditional devices being unable to measure the creep deformation of non-standard micro-sized samples is solved, and high-precision creep performance evaluation is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NCS JIANGSU TESTING TECH CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional creep testing devices are difficult to accurately measure the creep deformation of non-standard, small-sized samples. Existing non-contact measurement methods have low accuracy and poor performance at high temperatures, which cannot meet the precise evaluation needs of new material research and development and engineering applications.
A testing device comprising a tie rod, a creep clamp head, and a detection unit was designed. It employs a force sensor and a grating ruler for precise measurement and utilizes upper and lower extension plate assemblies and adjustment components to achieve high-precision deformation measurement of non-standard micro-sized samples.
It enables high-precision measurement of creep deformation of non-standard micro-sized samples, provides accurate performance data, is suitable for the research and development and engineering applications of new materials, and improves the accuracy and reliability of the test.
Smart Images
Figure CN224535616U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of material deformation technology, and in particular relates to a testing device for non-standard micro-sized creep deformation. Background Technology
[0002] Creep testing is a material mechanical property test that measures the slow plastic deformation of metallic materials under prolonged constant temperature and stress. The higher the temperature or the greater the stress, the more pronounced the creep phenomenon. Creep can occur under a single stress (tensile, compressive, or torsional) or under combined stress. Typical creep tests are conducted under uniaxial tensile conditions.
[0003] With the continuous emergence of new materials, such as 3D printing materials and other novel materials, creep durability tests are often required for small-sized or thin-walled samples during research and application. For example, materials used in key components of aerospace engines and gas turbines, due to their complex thin-walled structures (such as hollow turbine blades with a minimum wall thickness of only a few tenths of a millimeter), cannot meet design requirements with creep performance data from traditional standard samples. Therefore, creep tests on non-standard small samples are necessary to obtain performance data suitable for the component's overall size range. Traditional creep testing methods and equipment are mostly designed for standard-sized samples (gauge length greater than 25 mm or sample cross-sectional area greater than 7 mm²). 2 (For plate-shaped samples). For non-standard micro-sized samples, mechanical extensometers have high requirements for sample size, making it difficult to accurately measure the creep deformation of micro-sized samples; while existing non-contact measurement methods suffer from low accuracy and poor performance at high temperatures, resulting in great difficulty in measuring the creep deformation of small samples. In industrial production, the requirements for accurate evaluation of material properties are becoming increasingly stringent. Accurately testing the displacement or strain values of non-standard micro-sized materials under creep conditions is of great significance for accurately evaluating the mechanical properties of materials and the long-term storage reliability and structural integrity of structural components.
[0004] In summary, due to the needs of new material research and development, engineering applications, and teaching and research, traditional creep testing techniques and devices can no longer meet the requirements for measuring the creep deformation of non-standard micro-sized samples. There is an urgent need to develop new testing devices to solve key technical problems such as sample loading alignment, strain measurement accuracy, and temperature control precision, so as to achieve accurate testing and evaluation of the creep performance of non-standard micro-sized samples. Summary of the Invention
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A testing device for non-standard micro-sized creep deformation includes a pull rod connected to a testing device and a creep clamp head fixedly connected to the pull rod. The pull rod is also connected to a detection part for detecting deformation. The test sample is placed between the creep clamp heads.
[0007] The pull rod includes an upper pull rod and a lower pull rod, which are respectively connected to both ends of the testing equipment. The bottom of the lower pull rod is connected to a creep linkage, and the other end of the creep linkage is connected to a first sensor.
[0008] The creep clamp head includes an upper clamp and a lower clamp. The upper clamp is fixedly connected to the upper pull rod, and the lower clamp is fixedly connected to the upper clamp. The two ends of the test sample are respectively connected to the upper clamp and the lower clamp.
[0009] The detection unit includes an upper extension plate assembly and a lower extension plate assembly, which are connected by an adjustment assembly. A second sensor is also provided on the side of the lower extension plate assembly away from the adjustment assembly.
[0010] Furthermore, the upper extension plate assembly includes at least two sets of upper extension plate seats and an upper extension plate fixedly connected to the upper extension plate seats. The two sets of upper extension plate seats are symmetrically arranged on both sides of the creep connecting rod. The upper extension plate seats are also provided with at least two sets of first bearings. The upper extension plate seats are slidably connected to the creep connecting rod through the first bearings.
[0011] Furthermore, the two sets of upper extension plate seats are also provided with first adjusting rods, and the two sets of first adjusting rods are connected by a first elastic element.
[0012] Furthermore, the lower extension plate assembly includes at least two sets of lower extension plate seats and a lower extension plate fixedly connected to the lower extension plate seats. The two sets of lower extension plate seats are symmetrically arranged on both sides of the creep connecting rod. The lower extension plate seats are also provided with at least two sets of second bearings. The lower extension plate seats are slidably connected to the creep connecting rod through the second bearings.
[0013] Furthermore, the two sets of lower extension plate seats are also provided with second adjusting rods, and the two sets of second adjusting rods are connected by a second elastic element.
[0014] Furthermore, the detection unit also includes a jaw ring for connecting to the creep clamp head.
[0015] Furthermore, the first sensor is a force sensor, and the second sensor is a grating ruler.
[0016] The beneficial effects of this utility model are:
[0017] This utility model has the following advantages:
[0018] 1. Precise measurement of deformation: For non-standard, small-sized samples, it overcomes the limitations of traditional measurement methods and achieves high-precision measurement of creep deformation, providing reliable data for accurately evaluating the performance of materials under creep conditions.
[0019] 2. Meets special material testing needs: Adapts to the creep testing requirements of small-sized or thin-walled structural samples in new material research and development, such as special materials used in key components of 3D printing materials, aerospace engines and gas turbines, to obtain their real creep performance data and provide support for the engineering application of materials.
[0020] 3. Improved experimental accuracy and reliability: Addressing issues with traditional apparatus regarding sample loading alignment, strain measurement accuracy, and temperature control precision, ensuring the accuracy and reliability of experimental results, and facilitating in-depth research into the creep and fracture mechanisms of materials. Attached Figure Description
[0021] 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, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model (red represents the sample to be tested);
[0023] Figure 2 This is a schematic diagram of the upper extension plate assembly of this utility model;
[0024] Figure 3 This is a schematic diagram of the lower extension plate assembly of this utility model;
[0025] Explanation of reference numerals in the attached figures:
[0026] 1. Pull rod; 11. Upper pull rod; 12. Lower pull rod; 13. Creep linkage; 2. Creep clamp head; 21. Upper clamp; 22. Lower clamp; 3. Detection unit; 31. Upper extension plate assembly; 32. Lower extension plate assembly; 33. Second sensor; 34. Adjustment assembly; 35. Jaw ring; 4. Test sample; 5. First sensor. Detailed Implementation
[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention. Specific Implementation Example 1:
[0029] like Figures 1 to 3 As shown, a non-standard micro-sized creep deformation testing device includes a pull rod 1 connected to the testing equipment and a creep clamp head 2 fixedly connected to the pull rod 1. The pull rod 1 is also connected to a detection part 3 for detecting deformation. The test sample 4 is placed between the creep clamp heads 2.
[0030] The pull rod part 1 includes an upper pull rod 11 and a lower pull rod 12. The upper pull rod 11 and the lower pull rod 12 are respectively connected to the two ends of the testing equipment. The bottom of the lower pull rod 12 is connected to a creep connecting rod 13, and the other end of the creep connecting rod 13 is connected to a first sensor 5. The first sensor 5 is a force sensor.
[0031] The creep clamp head 2 includes an upper clamp 21 and a lower clamp 22. The upper clamp 21 is fixedly connected to the upper pull rod 11, and the lower clamp 22 is fixedly connected to the upper clamp 21. The two ends of the test sample 4 are respectively connected to the upper clamp 21 and the lower clamp 22.
[0032] The detection unit 3 includes an upper extension plate assembly 31 and a lower extension plate assembly 32, which are connected by an adjustment assembly 34. A second sensor 33 is also provided on the side of the lower extension plate assembly 32 away from the adjustment assembly 34. Preferably, the second sensor 33 is a grating ruler. Preferably, the detection unit 3 also includes a jaw ring 35 for connecting to the creep clamp head 2.
[0033] Specifically, the upper extension plate assembly 31 includes at least two sets of upper extension plate seats 311 and upper extension plates 312 fixedly connected to the upper extension plate seats 311. The two sets of upper extension plate seats 311 are symmetrically arranged on both sides of the creep connecting rod 13. Each upper extension plate seat 311 is also provided with at least two sets of first bearings 313, and the upper extension plate seat 311 is slidably connected to the creep connecting rod 13 through the first bearings 313. Specifically, each set of upper extension plate seats 311 is also provided with a first adjusting rod 314, and the two sets of first adjusting rods 314 are connected by a first elastic element 315. Specifically, the lower extension plate assembly 32 includes at least two sets of lower extension plate seats 321 and lower extension plates 322 fixedly connected to the lower extension plate seats 321. The two sets of lower extension plate seats 321 are symmetrically arranged on both sides of the creep connecting rod 13. At least two sets of second bearings 323 are also provided on each lower extension plate seat 321, and the lower extension plate seats 321 are slidably connected to the creep connecting rod 13 through the second bearings 323. It can be understood that the two sets of lower extension plate seats 321 are also provided with second adjusting rods 324, and the two sets of second adjusting rods 324 are connected by a second elastic element 325.
[0034] Operating instructions:
[0035] (1) Install the upper and lower tie rods on the testing machine. When using the fixture, first put the creep jaw ring on the clamp on the fixture, and then install it on the matching tie rod. All are connected with coarse thread.
[0036] (2) The small-sized sample (taking φ3mm diameter, M6 coarse thread as an example) is threaded and clamped on the fixture according to the assembly drawing;
[0037] (3) After the specimen is installed, apply an initial load to the testing machine to ensure the coaxiality of the specimen. Then, clamp the upper and lower lead-out devices at the tool lugs and use creep jaw rings to clamp the lead-out devices so that they cannot move up and down, so as to ensure that a more accurate deformation is measured.
[0038] (4) There are two holes for installing extensometers on the furnace exterior part of the upper and lower lead-out devices. Insert the left and right grating rulers into the corresponding holes and lock them with studs.
[0039] (5) After the above steps are completed, use a testing machine to pull the specimen with a force of about 10% of the total load, and use a wooden mallet to tap the upper and lower creep jaw rings to adjust the left and right deformation values so that the left and right values do not exceed 8% of the average deformation to meet the standard requirements.
[0040] (6) After the test begins, the deformation can be read at any time during the test. Then, the strain can be converted into the corresponding strain at any time by using the gauge length adjustment in the ASTM E139-24 test standard as the denominator.
[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A testing device for non-standard micro-sized creep deformation, characterized in that: It includes a pull rod (1) connected to the testing equipment and a creep clamp head (2) fixedly connected to the pull rod (1). The pull rod (1) is also connected to a detection part (3) for detecting deformation. The test sample (4) is placed between the creep clamp heads (2). The pull rod part (1) includes an upper pull rod (11) and a lower pull rod (12). The upper pull rod (11) and the lower pull rod (12) are respectively connected to both ends of the test equipment. The bottom of the lower pull rod (12) is connected to a creep connecting rod (13), and the other end of the creep connecting rod (13) is connected to a first sensor (5). The creep clamp head (2) includes an upper clamp (21) and a lower clamp (22). The upper clamp (21) is fixedly connected to the upper pull rod (11), and the lower clamp (22) is fixedly connected to the upper clamp (21). The two ends of the test sample (4) are connected to the upper clamp (21) and the lower clamp (22) respectively. The detection unit (3) includes an upper extension plate assembly (31) and a lower extension plate assembly (32). The upper extension plate assembly (31) and the lower extension plate assembly (32) are connected by an adjustment assembly (34). A second sensor (33) is also provided on the side of the lower extension plate assembly (32) away from the adjustment assembly (34).
2. The testing device for non-standard micro-sized creep deformation according to claim 1, characterized in that: The upper extension plate assembly (31) includes at least two sets of upper extension plate seats (311) and an upper extension plate (312) fixedly connected to the upper extension plate seats (311). The two sets of upper extension plate seats (311) are symmetrically arranged on both sides of the creep connecting rod (13). The upper extension plate seats (311) are also provided with at least two sets of first bearings (313). The upper extension plate seats (311) are slidably connected to the creep connecting rod (13) through the first bearings (313).
3. The testing device for non-standard micro-sized creep deformation according to claim 2, characterized in that: The two sets of upper extension plate seats (311) are also provided with first adjusting rods (314), and the two sets of first adjusting rods (314) are connected by a first elastic element (315).
4. The testing device for non-standard micro-sized creep deformation according to claim 1, characterized in that: The lower extension plate assembly (32) includes at least two sets of lower extension plate seats (321) and a lower extension plate (322) fixedly connected to the lower extension plate seats (321). The two sets of lower extension plate seats (321) are symmetrically arranged on both sides of the creep connecting rod (13). The lower extension plate seats (321) are also provided with at least two sets of second bearings (323). The lower extension plate seats (321) are slidably connected to the creep connecting rod (13) through the second bearings (323).
5. The testing device for non-standard micro-sized creep deformation according to claim 4, characterized in that: The two sets of lower extension plate seats (321) are also provided with second adjusting rods (324), and the two sets of second adjusting rods (324) are connected by a second elastic element (325).
6. The testing device for non-standard micro-sized creep deformation according to claim 1, characterized in that: The detection unit (3) also includes a jaw ring (35) for connecting the creep clamp head (2).
7. The testing device for non-standard micro-sized creep deformation according to claim 1, characterized in that: The first sensor (5) is a force sensor, and the second sensor (33) is a grating ruler.