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Small punch test friction coefficient determination method based on inverse finite element method

A technology of friction coefficient and finite element method, which is applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of small punch samples and fixtures, and the friction coefficient of small punches has not been measured yet. Achieving the effect of reliable fracture toughness

Inactive Publication Date: 2017-05-31
EAST CHINA UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

However, the size of the small punch sample and the fixture is very small, and the existing method of installing sensors to directly measure the parameters related to the friction coefficient from the test process cannot be realized
Therefore, there is almost no method for measuring the friction coefficient of the small punch test.

Method used

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  • Small punch test friction coefficient determination method based on inverse finite element method
  • Small punch test friction coefficient determination method based on inverse finite element method
  • Small punch test friction coefficient determination method based on inverse finite element method

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Embodiment 1

[0041] see Figure 1 to Figure 7 , the present invention discloses a method for determining the friction coefficient of a small punch test based on the reverse finite element method, which is applied to the parameters of the material obtained by the finite element simulation of the small punch test, and the method includes:

[0042] Step S1: Determine the test friction coefficient; specifically include:

[0043] - Step S11: determine the change law of the small punch load-displacement curve when the friction coefficient changes;

[0044] In the finite element numerical simulation of the small punch test, the main factors affecting the load-displacement curve of the small punch are: true stress-strain curve, friction coefficient, and GTN model parameters; To obtain the true stress-strain curve, it is necessary to ensure that there is a unique correspondence between the two, that is, the small punch load-displacement curve cannot be affected by the friction coefficient and the ...

Embodiment 2

[0053] A method for determining the friction coefficient of a small plunger test based on the reverse finite element method, which is applied to the finite element simulation of the small plunger test to obtain material parameters, said method comprising:

[0054] Step S1: Determine the test friction coefficient; specifically include:

[0055] - Step S11: determine the change law of the small punch load-displacement curve when the friction coefficient changes;

[0056] - Step S12: law analysis of the contact pressure of the small punch test;

[0057] - Step S13: Design of the friction coefficient measurement system for the small punch test;

[0058] According to the results obtained in step S11 and step S12, a small punch sample with a central opening is designed, and the contact pressure between the steel ball and the sample is adjusted by adjusting the diameter of the central hole of the sample, and finally the aperture is determined;

[0059] - Step S14: measurement of th...

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Abstract

The invention discloses a small punch test friction coefficient determination method based on an inverse finite element method which is applied to finite element simulation of material parameters obtained through a small punch test. The method comprises the steps that 11, when the friction coefficient changes, a change rule of a small punch load-displacement curve is determined; 12, the small punch contact pressure rule is analyzed; 13, a small punch test friction coefficient measurement system is designed; 14, the small punch test friction coefficient is measured; finite element simulation is conducted on a small punch specimen which is obtained in the step 13 and provided with a circular hole of a certain diameter in the center; simulation curves under different friction coefficients are compared with an experimental curve, target functions are set through neural networks, when the definition meets one target function, the simulation curve and the experimental are the closest, and at the moment, the friction coefficient corresponding to the simulation curve is the friction coefficient in the test.

Description

technical field [0001] The invention belongs to the field of computer-aided technology and relates to a test method, in particular to a method for determining the friction coefficient of a small punch test based on the reverse finite element method. Background technique [0002] The mechanical properties of materials will deteriorate for pressure-bearing equipment that has been working in harsh environments such as high temperature, high pressure, low temperature and radiation for a long time. In order to ensure that the equipment can operate normally and will not cause safety accidents, it is very important to conduct reliable safety assessments, life predictions and regular inspections of degraded materials. Compared with the standard tensile, impact, and fracture toughness tests, the small punch test has attracted widespread attention and developed rapidly due to its less consumables and minimal damage sampling that will not damage the structural integrity of the equipmen...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 关凯书许立萌郭林灵黄瑞彬付明雪周腾飞
Owner EAST CHINA UNIV OF SCI & TECH
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