Sample, fixture and method for metallic material single-axis creep resistance test

Abstract

The invention relates to the technical field of mechanical property test of metallic materials, specifically to a sample, a fixture and a method for a metallic material single-axis creep resistance test. The main points of the technical scheme are as follows: the sample comprises a test part and clamped parts which are formed integrally with the two ends of the test part; the connections between the test part and the clamped parts are surrounded by bosses; the test part, the clamped parts and the bosses coincide in central axes, of which diameters of cross sections are gradually increased; andthreads in threaded connections with a test fixture are formed on the clamped parts. The fixture fixes the clamped parts. When the tensile creep resistance of the sample is tested, the test result ismore accurate because the threaded connection and fixation help clamp better, and make the possibility to slide small and when the pressure creep resistance of the sample is tested, the threaded connections also play a great role in fixing. The bosses make the clamping and connections stabler, and also play a role in centre alignments, which also results in a more accurate test result. The invention realizes that the pressure creep resistance and the tensile creep resistance of the sample are sequentially tested by a same instrument and the tests are highly efficient.

Description

technical field

[0001] The invention relates to the technical field of metal material mechanical property test, more specifically, it relates to a metal material uniaxial creep resistance test sample, fixture and method. Background technique

[0002] Creep resistance is the ability of a material to maintain no failure under specified creep conditions (at a certain temperature and within a certain period of time, to achieve a certain creep deformation or creep speed), which is expressed by failure stress in the measurement. At a certain temperature, the phenomenon of slow plastic deformation of metal under the action of continuous stress is called creep of metal. As the working temperature increases, the creep phenomenon of the material becomes more and more obvious, and the requirements for the creep strength of the material are getting higher and higher. Different working temperatures require the selection of materials with different creep properties, so accurate determina...

Examples

Embodiment 1

[0054] A metal material uniaxial creep test specimen, such as figure 2 As shown, it includes the test part 2 and the clamping part 1 integrally formed with the two ends of the test part 2. The connection between the test part 2 and the clamping part 1 is surrounded by a boss 3. The central axis of the center axis coincides, and the diameter of the cross section increases sequentially; the clamping part 1 is provided with a screw thread connected with the test fixture 4; the connecting boss 3 of the clamping part 1 is provided with a groove 11, and the groove 11 is connected with the fixture Raised ring 44 in 4 (see image 3 ) are snapped together. The cross-sectional diameter of the test part 2 is 4.5-5 mm, and the cross-sectional diameter of the boss 3 is 2-2.5 times of the cross-sectional diameter of the test part 2 . The radius of the concave arc of the groove 11 is 0.6-0.7 mm, and the junction of the test part 2 and the boss 3 forms an arc 21 transition, and the radius ...

Embodiment 2

[0056] A metal material uniaxial creep resistance test fixture 4, including a clamping hole 42 for clamping the clamping part 1 of the metal material uniaxial creep resistance test sample in Example 1, and the clamping hole 42 is provided with The thread matched with the thread of the clamping part 1 is used to insert the insertion hole 43 of the boss 3; the connection between the clamping hole 42 and the insertion hole 43 is provided with a protruding ring 44 that snaps into the groove 11; on the clamp 4 A pilot hole 41 coaxial with the insertion hole 43 is also provided for centering with the testing machine.

[0057] The sample in Example 1 is used in conjunction with the fixture 4 in Example 2, the matching is higher, and the test data is more accurate.

[0058] The clamp 4 fixes the clamping part 1. When the tensile creep of the test sample needs to be tested, the threaded connection is better for clamping, and it is not easy to slide during the test, and the test result ...

Embodiment 3

[0062] A metal material uniaxial creep resistance test method, comprising a compressive creep test and a tensile creep test;

[0063] Compressive creep involves the following steps:

[0064] S1 The metal material uniaxial creep resistance test sample in embodiment 1 is vertically installed between the upper and lower two metal material uniaxial creep resistance test fixtures in embodiment 2 of the creep endurance test machine, and the sample is adjusted so that it is vertically The axis coincides with the longitudinal axis of the pressure plate;

[0065] S2 Heating the sample to the specified test temperature;

[0066] S3 Apply the test force in the axial direction of the sample;

[0067] S4 When the load corresponding to the test force is fully applied on the sample, the creep test starts and the creep deformation is recorded, the compressive creep test is performed, and the data is recorded.

[0068] The procedure for tensile creep is the same as for compressive creep, bu...

technical field

[0001] The invention relates to the technical field of metal material mechanical property test, more specifically, it relates to a metal material uniaxial creep resistance test sample, fixture and method. Background technique

[0002] Creep resistance is the ability of a material to maintain no failure under specified creep conditions (at a certain temperature and within a certain period of time, to achieve a certain creep deformation or creep speed), which is expressed by failure stress in the measurement. At a certain temperature, the phenomenon of slow plastic deformation of metal under the action of continuous stress is called creep of metal. As the working temperature increases, the creep phenomenon of the material becomes more and more obvious, and the requirements for the creep strength of the material are getting higher and higher. Different working temperatures require the selection of materials with different creep properties, so accurate determina...

Examples

Embodiment 1

[0054] A metal material uniaxial creep test specimen, such as figure 2 As shown, it includes the test part 2 and the clamping part 1 integrally formed with the two ends of the test part 2. The connection between the test part 2 and the clamping part 1 is surrounded by a boss 3. The central axis of the center axis coincides, and the diameter of the cross section increases sequentially; the clamping part 1 is provided with a screw thread connected with the test fixture 4; the connecting boss 3 of the clamping part 1 is provided with a groove 11, and the groove 11 is connected with the fixture Raised ring 44 in 4 (see image 3 ) are snapped together. The cross-sectional diameter of the test part 2 is 4.5-5 mm, and the cross-sectional diameter of the boss 3 is 2-2.5 times of the cross-sectional diameter of the test part 2 . The radius of the concave arc of the groove 11 is 0.6-0.7 mm, and the junction of the test part 2 and the boss 3 forms an arc 21 transition, and the radius ...

Embodiment 2

[0056] A metal material uniaxial creep resistance test fixture 4, including a clamping hole 42 for clamping the clamping part 1 of the metal material uniaxial creep resistance test sample in Example 1, and the clamping hole 42 is provided with The thread matched with the thread of the clamping part 1 is used to insert the insertion hole 43 of the boss 3; the connection between the clamping hole 42 and the insertion hole 43 is provided with a protruding ring 44 that snaps into the groove 11; on the clamp 4 A pilot hole 41 coaxial with the insertion hole 43 is also provided for centering with the testing machine.

[0057] The sample in Example 1 is used in conjunction with the fixture 4 in Example 2, the matching is higher, and the test data is more accurate.

[0058] The clamp 4 fixes the clamping part 1. When the tensile creep of the test sample needs to be tested, the threaded connection is better for clamping, and it is not easy to slide during the test, and the test result ...

Embodiment 3

[0062] A metal material uniaxial creep resistance test method, comprising a compressive creep test and a tensile creep test;

[0063] Compressive creep involves the following steps:

[0064] S1 The metal material uniaxial creep resistance test sample in embodiment 1 is vertically installed between the upper and lower two metal material uniaxial creep resistance test fixtures in embodiment 2 of the creep endurance test machine, and the sample is adjusted so that it is vertically The axis coincides with the longitudinal axis of the pressure plate;

[0065] S2 Heating the sample to the specified test temperature;

[0066] S3 Apply the test force in the axial direction of the sample;

[0067] S4 When the load corresponding to the test force is fully applied on the sample, the creep test starts and the creep deformation is recorded, the compressive creep test is performed, and the data is recorded.

[0068] The procedure for tensile creep is the same as for compressive creep, bu...

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