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A neutron measurement method for studying the microstructure of brittle materials

A measurement method and technology of microstructure, applied in the direction of material analysis, measurement device, analysis material, etc. using wave/particle radiation, which can solve problems such as inability to conduct, camera blocking neutron beam, etc.

Active Publication Date: 2020-10-23
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using a speckle strain gauge, the camera needs to face the surface of the object to be measured, and this surface is also the measurement surface that the neutron beam of the neutron small-angle scattering measurement faces. Therefore, when carrying out the Brazilian experiment in the neutron small-angle scattering measurement The placement position coincides with the neutron beam, causing the camera to block the neutron beam. For the above reasons, the Brazilian experiment cannot be carried out in the neutron small-angle scattering experiment.

Method used

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  • A neutron measurement method for studying the microstructure of brittle materials
  • A neutron measurement method for studying the microstructure of brittle materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 2 As shown, the mechanical loading device 3 of the neutron measurement method used in the study of the microstructure of brittle materials in this embodiment is a fixed upper end loading method, and the sample table 6 has a lifting function. The measurement method includes the following steps:

[0026] a. Parameter initialization and sample initial state measurement: set the number of single-step neutron measurements measured by the neutron small-angle scattering spectrometer, and the sample diameter D s The sample information parameter and the sample thickness, initialize the current strain parameter T of the measured sample 4 c and control the current position A of the horizontal turntable 5 r be zero; start the neutron monitor 9 to count the measured neutrons, start the neutron detector 7 to measure the scattering signal of the tested sample 4, and obtain the measurement result of the initial state of the sample;

[0027] b. Control the horizontal ro...

Embodiment 2

[0036] The neutron measurement method used in the study of the microstructure of brittle materials in this embodiment is basically the same as that in Embodiment 1, except that the camera 8 of the speckle strain gauge in this embodiment is placed on the right side of the sample stage 6 , The mechanical loading device 3 is a loading mode with the lower end fixed and the upper end loaded.

[0037] Step b is: control the horizontal rotary table 5 to the strain loading position: control the horizontal rotary table 5 to rotate to the right at a fixed angle θ, so that the sample surface faces the lens of the camera 8 of the speckle strain gauge;

[0038] Step d is: strain loading and measurement: set T c The value of is assigned to the nearest dependent variable T c-last ; Control the mechanical loading device 3 to perform mechanical loading on the tested sample 4, and the loading displacement is L Δ , during the loading process, the speckle strain gauge measures and feeds back th...

Embodiment 3

[0040] The implementation of the neutron measurement method for studying the microstructure of brittle materials in this embodiment is basically the same as that in Embodiment 1, except that the mechanical loading device is a double-end simultaneous loading method.

[0041] Step d is: strain loading and measurement: set T c The value of is assigned to the nearest dependent variable T c-last ; Control the mechanical loading device 3 to perform mechanical loading on the tested sample 4, and the loading displacement is L Δ , during the loading process, the speckle strain gauge measures and feeds back the actual deformation L of the tested sample 4 r ; After the loading is complete, update the current strain T c parameter, the calculation formula is: T c = T c-last +L r / D s .

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Abstract

The invention discloses a neutron measurement method for studying the microstructure of a brittle material. The method realizes the measurement of a small-angle neutron scattering signal of the brittle material under different strains in a Brazilian test developing process by reasonably configuring multiple measuring devices, arranging a relative positional relationship among the measurement devices and introducing a discrete strain calculation technology, and can effectively ensure the consistence of a neutron measurement area in a measured sample in different strain states. The method is used together with a small-angle neutron scattering spectrometer to carry out the Brazilian test on ceramics, polymers and other brittle materials and online detect the microscopic deformation, crackingdamage and damage process of the material, so the analytic study of the mechanical properties and the damage mechanism of the material are facilitated.

Description

technical field [0001] The invention belongs to the technical field of environmental loading in neutron small-angle scattering applications, and in particular relates to a neutron measurement method for microstructure research of brittle materials. Background technique [0002] Neutron small-angle scattering technology has non-destructive detection and deep penetration characteristics, and is an effective method for studying the internal microstructure information of materials such as the precipitated phase of metals, the configuration of polymers and biomolecules, and dopants inside materials. The Brazilian test is a common experimental method for studying the tensile strength, fracture strain, creep, fatigue and other characteristics of brittle materials, and is widely used to measure the mechanical properties of ceramics and polymers. The difficulty of the Brazilian experiment lies in the measurement of the small strain of brittle materials. The speckle strain gauge is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/202
CPCG01N23/202
Inventor 庞蓓蓓闫冠云潘建孙光爱刘栋孙良卫陈良王云
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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