Method for detecting high-temperature viscoelastic parameters of glass material

A technology for parameter detection and glass materials, applied in the direction of analyzing materials, using stable bending force to test the strength of materials, measuring devices, etc., can solve the problems that the test pieces are easy to break, cannot be reached, and glass viscoelastic parameters cannot be obtained. The effect of achieving effective and reliable viscoelastic parameters

Pending Publication Date: 2021-06-01
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

Existing dynamic thermomechanical analyzers cannot reach such high temperatures
If a material testing machine with a heating module is used, the specimen is easily broken during clamping, and the viscoelastic parameters of the glass at high temperature cannot be obtained

Method used

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  • Method for detecting high-temperature viscoelastic parameters of glass material
  • Method for detecting high-temperature viscoelastic parameters of glass material
  • Method for detecting high-temperature viscoelastic parameters of glass material

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example

[0068]A specific example of determining the high temperature relaxation modulus of the glass material is determined below.

[0069]Step 1: Three-point bending experiments for the glass material measuring the high temperature creep strength of the glass material using a thermomechanical analyzer (TMA).

[0070]Such asfigure 2 As shown, a three-point bending experiment is used, and the glass sample is warmed to the test temperature. In this example, the temperature is 730 ° C, and the glass sample is applied to the glass sample, and the experiment is started to last for 30 min until the deformation is too large. Record the curve of the sample curved shape varies.

[0071]Step 2: High temperature creep pushing of the glass material.

[0072]The resulting data is obtained according to the measured data processing, and the glass creep is changed with time, such asimage 3 Indicated. It is found that this curve is approximately a straight line, so it can be regarded as a Maxwell's constitutive model. ...

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Abstract

A method for detecting high-temperature viscoelastic parameters of a glass material comprises the following steps: A, heating a glass test piece to a test temperature, applying force to the glass test piece for a preset time, and recording a curve of bending deformation of the glass test piece along with time; B, processing the measured data to obtain a curve of the creep compliance of the glass test piece along with time, and fitting the creep compliance of the glass test piece; C, performing Laplace transformation on the creep compliance obtained by fitting, obtaining Laplace transformation of the relaxation modulus according to a conversion relation between the creep compliance and the relaxation modulus, and then performing inverse Laplace transformation to obtain an expression equation of the relaxation modulus in a time domain; and D, judging whether the expression equation of the relaxation modulus is a Prony series expression form of the relaxation modulus or not, if yes, taking the expression equation as a detection result, otherwise, fitting the expression equation by using the Prony series, and taking the expression equation as a high-temperature viscoelastic parameter detection result. According to the invention, the defects of temperature limitation and easy breakage of the glass test piece can be overcome, and the viscoelastic parameters of the glass material in a high-temperature state can be effectively and reliably measured.

Description

Technical field[0001]The present invention relates to a high temperature viscoelastic parameter detection method for glass material.Background technique[0002]3D glass is widely used in smartphones, computer tablets such as smartphones, computer tablets. Glass hot bending technology is one of the currently used 3D glass processing methods. With the development of computer technology, in order to further optimize the thermal bending process of the glass, save process R & D cost, finite element simulation technology has become an important research method. To ensure the reliability of simulation analysis results, it is necessary to obtain the material of the material of the glass. The glass is characterized by brittleness at normal temperature, and when the temperature is higher than the softening point of the material, the glass is viscous. Glass is usually considered viscoelastic between transition points and softening points. The glass material in this state is suitable for hot bend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
CPCG01N3/20G01N2203/0023
Inventor 冯平法查慧婷徐赵博许超马原冯峰
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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