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Method for detecting permanent set stress of metal material

A residual elongation, metal material technology, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of high detection cost, human error, inappropriate detection, etc., to achieve stable test data, improve test efficiency, and operation process. simple effect

Inactive Publication Date: 2012-06-13
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] First of all, the example only mentions the detection method of a certain material, which is not suitable for the detection of some materials, and is not applicable to samples of different specifications, and there are limitations in the detection
Secondly, manual control has a large human error, and the sample control is not standardized, resulting in a low test success rate, unstable data dispersion, high testing costs, and poor comparability of test results.

Method used

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  • Method for detecting permanent set stress of metal material
  • Method for detecting permanent set stress of metal material
  • Method for detecting permanent set stress of metal material

Examples

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Effect test

Embodiment 1

[0033] Detect the specified residual elongation stress (R r0.2 ):

[0034] The sample adopts R7 (Φ5mm) circular proportion sample, and the extensometer of model SSG25-10 is used to measure the deformation of the sample. The gauge length of the extensometer is 25mm, and the specified residual elongation is 25mm×0.2%=0.05mm. Technical standards require Rr0.2≥820MPa, preload F 0 = R r0.2 ×S 0 ×10%=820×3.14×(5 / 2) 2 ×10%=1609N, take an integer of 1600N. Set to pause when the number of cycles reaches 6, manually remove the extensometer, and then set the peak force of not less than 21000N (to ensure the fracture of the test piece) to continue to apply the load until the sample breaks, and automatically record the test data of each stage . The method for detecting the specified residual elongation stress of metal materials in the present invention, the process is as follows Image 6 As shown, the specific steps are as follows:

[0035] Step 1: Set the preload F 0 =1600N, load...

Embodiment 2

[0052] Detect the specified residual elongation stress (R r0.2 ):

[0053] The sample adopts P4 (specification 2mm×20mm) rectangular proportion sample, and the extensometer of model SSG50-10 is used to measure the deformation of the sample. The gauge length of the extensometer is 50mm, and the specified residual elongation is 50mm×0.2%=0.1 mm. Technical standard requires R r0.2 ≥196MPa, preload F 0 = R r0.2 ×S 0 ×10%=196×2×20×10%=784N, rounded up to 800N. The sample is connected to the testing machine through the fixture, and the extensometer is installed and zeroed. Set to pause when the number of cycles reaches 6, manually remove the extensometer, and then set the peak force of not less than 3000N (to ensure the fracture of the test piece) to continue to apply the load until the sample breaks, and automatically record the test data of each stage . ; Carry out the inventive method as follows:

[0054] Step 1: Set the preload F 0 =800N, loading rate 4mm / min, dwell ti...

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Abstract

The invention provides a method for detecting the permanent set stress of a metal material, belonging to the technical field of metal material detection. The method is as follows: adopting a manual mode for a grouping test, and finding the influence law of the test result caused by the duration time, the loading and unloading circulation times, loading speed ratio, sample sizes and processing quality; finding and controlling key factors, determining the optimal test parameters, compiling test control programs, and changing the manual control into automatic program control. The program control method is adopted for detecting the permanent set stress of the metal material, the operation process is simple and standard, the errors caused by artificial operation are eliminated greatly, the test data is stable, the mechanical properties of the materials can be reflected truly, the test efficiency is improved, and the test requirement of the scientific research and the production can be met.

Description

technical field [0001] The invention belongs to the technical field of metal material detection, and in particular relates to a method for detecting the specified residual elongation stress of metal materials. Background technique [0002] The detection method for the specified residual elongation stress of metal materials is not clearly stipulated in the existing relevant international standards, navigation aids and various industry standards. And GB / T228-2002 standard, only provides a kind of example that can adopt manual control detection method in appendix Ι, and the illustration is more general, therefore, there is certain problem in actual detection: [0003] First of all, the example only mentions the detection method of a certain material, which is not suitable for the detection of some materials, and is not suitable for samples of different specifications, and there are limitations in the detection. Secondly, the use of manual control has a large human error, and t...

Claims

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Application Information

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IPC IPC(8): G01L1/00
Inventor 孙奇闫秀芬滕志强韦廷立张立新
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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