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Method of detecting residual principal stress of polymer product

A technology of polymer materials and principal stress, which is applied in the fields of analyzing materials, using wave/particle radiation for material analysis, measuring devices, etc. wide range of effects

Active Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for detecting the residual principal stress of polymer material products in order to overcome the limitations, large errors, and complicated operations of the existing polymer stress detection technology. The method is a non-destructive test and has a wide range of applications. , to a large extent make up for the shortcomings of existing polymer stress detection methods

Method used

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  • Method of detecting residual principal stress of polymer product
  • Method of detecting residual principal stress of polymer product

Examples

Experimental program
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Effect test

Embodiment 1

[0052] After the polypropylene material is extruded into a sheet at 230°C, it is cut into a polypropylene material of 7cm×7cm×0.2cm (length×width×height), and the polypropylene material is stretched using a biaxial stretching machine, and the polypropylene material is stretched at 155°C The bottom is stretched to five times along the machine direction (MD) at a rate of 300% deformation per second, and the size of the central position of the stretched polypropylene material is 5cm * 5cm * 0.03cm (length * width * height ) sample, adsorbed on the sample stage with deionized water, adjust the X-ray incident angle and the detector receiving angle to be 13 degrees, collect the X-ray diffraction ring spectrum of the sample, and select the second highest angle diffraction peak corresponding to the The (060) crystal plane was used as the diffraction crystal plane for testing. The sample stage is then rotated around S 3 Axis, according to the rotation azimuth angle in the plane of the...

Embodiment 2

[0054] After the polypropylene material is extruded into a sheet at 230°C, it is cut into a polypropylene material of 7cm×7cm×0.0025cm (length×width×height), and the polypropylene material is stretched using a biaxial stretching machine, and the polypropylene material is stretched at 155°C It is stretched to five times along the machine direction (MD) at a rate of 300% deformation per second, and then heated to 173°C, and then stretched to seven times at the same stretching speed perpendicular to the machine direction (TD). Biaxially stretched film, the size of the central position of the stretched polypropylene material is taken as a sample of 5cm × 5cm × 0.0025cm (length × width × height), adsorbed on the sample stage with deionized water, and adjust the X-ray Both the incident angle and the detector receiving angle are 13 degrees. For the sample diffraction ring collected, the (060) crystal plane corresponding to the second highest angle diffraction peak in the field of view...

Embodiment 3

[0056] Cut a PE100 polyethylene pipe with an outer diameter of 4 cm into 12 cm long pieces and fix it on the sample stage so that the highest point of the pipe wall is at the incident point of X-rays. Adjust the X-ray incident angle and the detector receiving angle to be 18 degrees, collect the sample diffraction ring, and select the (040) crystal plane corresponding to the highest angle diffraction peak in the field of view as the diffraction crystal plane for testing. Then tilt the sample stage 22.5° clockwise around the S1 axis, rotate the sample stage around the S3 axis in the plane of the sample stage according to the rotation azimuth angle 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315° are rotated sequentially and the diffraction ring data is collected to obtain 8 diffraction ring data maps, and import the obtained 8 diffraction ring data maps into Bruker DIFFRAC.LEPTOS stress calculation software, set the calculation range of data selection: the start angle of integral ...

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Abstract

The invention relates to the field of stress measurement of polymer materials and discloses a method of detecting the residual principal stress of a polymer product. The method adopts a two-dimensional X-ray diffraction method to quantitatively detect the residual principal stress of the polymer product, the polymer material adopts a crystalline region and an amorphous region, and in the presenceof the residual stress, the crystalline region and the amorphous region have the same strain. The method provided in the invention succeeds in application of the two-dimensional X-ray diffraction method to the residual principal stress detection on a polymer engineering material, the limitations that the traditional two-dimensional X-ray diffraction method can only be applied to detection on the residual stress of a polycrystalline metal material are broken, and the detection method is simple and controllable, the application range is wide, the detection errors are small, and the application prospect is broad.

Description

technical field [0001] The invention relates to the field of polymer material stress measurement, in particular to a method for detecting residual principal stress of polymer material products. Background technique [0002] At present, there are mainly four methods for the research on the residual stress of polymers: one is the birefringence method, which can directly observe the distribution of stress through optical means, but this method is limited to transparent materials, especially transparent films, and its application is very limited The second is the layer removal method. After physically removing a layer of the material, the stress can be measured by its bending deformation. However, this method can only be applied to flat materials, and there are few applications for analyzing the stress of the sheet in practical applications; It is a chemical probe method. In this method, materials are soaked in chemical reagents. Since materials with high stress are more likely ...

Claims

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Application Information

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IPC IPC(8): G01L5/00G01N23/207
CPCG01L5/0047G01N23/207
Inventor 史颖郑萃任敏巧刘立志
Owner CHINA PETROLEUM & CHEM CORP
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