Method for controlling whole-course displacement in program-controlled metal material stretching test

A technology of displacement control and tensile test, applied in the direction of electrical program control, program control in sequence/logic controller, using stable tension/pressure to test material strength, etc., can solve the problem of incomparability and influence of test results Accuracy, system flexibility test process complexity and other issues, to achieve the effect of improving work efficiency and simple model

Active Publication Date: 2010-03-03
TIANJIN PIPE GROUP CORP
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Problems solved by technology

The variation of the tensile rate of the high-flexibility test system may even reach hundreds of times, which will inevitably affect the accuracy of the test results
[0005] Because it is generally believed

Method used

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  • Method for controlling whole-course displacement in program-controlled metal material stretching test
  • Method for controlling whole-course displacement in program-controlled metal material stretching test

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Embodiment Construction

[0039] The realization process of the whole process displacement control method of the metal material tensile test for program control of the present invention is described in conjunction with the accompanying drawings and embodiments.

[0040] The whole process displacement control method of the metal material tensile test for program control of the present invention, the test application program of the control method is set in the electro-hydraulic servo or electronic universal testing machine, the control method includes the following steps:

[0041] ①The first stage of displacement control

[0042] At the start of the test, the test application program tells the tester to move the grips by v c1 =0.00025(Lc+C M ES O ) to move toward the elongation direction of the sample until the load on the sample is F=F 2 end of time; C M and E take the default value; when F=F 2 , the program automatically calculates Then automatically calculate ready to C M Calculated values ​...

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Abstract

The invention provides a method for controlling whole-course displacement in a program-controlled metal material stretching test. The control method is arranged is a test application program of an electro-hydraulic servo or electronic universal testing machine; the control method comprises the following steps of: displacement control in the first stage, displacement control in the second stage, displacement control in the third stage and the displacement control in the fourth stage. The method has the effects that the control method provides a mathematic model which automatically computes theflexibility of the system in the testing process, and the model is simple and reliable and aims at the system flexibility computation on each testing sample. The whole test is carried out automatically, great convenience is brought to the testing personnel, and the working efficiency and accuracy of the yield strength test are improved obviously. The method is applicable to the requirements on thestretching rates at different stages of various metal material samples; furthermore, rate conversion is smoothly transitional before the yield stage is finished; and the discontinuity is not introduced on the stress-strain curve. The method is applicable to the production, research and technical reconstruction on a stretching testing machine.

Description

technical field [0001] The invention relates to a test method in the material science test technology, in particular to a method for controlling the whole process displacement of a metal material tensile test under program control. Background technique [0002] The tensile test rate has a significant effect on the yield strength test of metallic materials. Although many national and international standards for tensile tests around the world have stipulated the tensile rate, even if different laboratories use the same tensile rate, for example, enter the yield with a constant 2mm / min beam separation rate before yielding stage, the measured yield strength will have greater dispersion. This is because most laboratories do not consider the effect of system compliance on the actual deformation rate on the specimen. [0003] If the strain rate control method based on the feedback of the extensometer is used to eliminate the influence of the flexibility of the tensile testing mac...

Claims

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Application Information

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IPC IPC(8): G05B19/04G01N3/08
Inventor 苏英群
Owner TIANJIN PIPE GROUP CORP
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