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Method for quickly detecting residual principal stress of polymer material products

A polymer material and principal stress technology, which is used in material analysis using radiation diffraction, measuring devices, force/torque/work measuring instruments, etc. It can solve the problems of sample center offset, calculation result error, etc., and achieve accurate measurement results. , the effect of short data collection time

Active Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN105021331A has provided the measuring method of the polycrystalline material residual stress based on X-ray diffraction full spectrum, and it is to utilize X-ray diffraction spectrum line, on the basis of considering polycrystalline grain orientation, obtains the plane strain of polycrystalline material, in On this basis, combined with the stress-strain relationship of polycrystalline materials, the residual stress value of polycrystalline materials is finally calculated, but this method is only for metal materials.
There are literatures that use multiple inclination angles to collect data for residual stress analysis of polymer products, but the problem of sample center deviation is prone to occur in the process of collecting data at multiple inclination angles, resulting in large errors in calculation results

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  • Method for quickly detecting residual principal stress of polymer material products
  • Method for quickly detecting residual principal stress of polymer material products
  • Method for quickly detecting residual principal stress of polymer material products

Examples

Experimental program
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Embodiment 1

[0064] The polymer material product adopted in this embodiment is polyethylene (brand name is TR480M). The polyethylene pellets were injection-molded on a Haitian MA900 injection machine into a diaphragm with a size of 60mm×60mm×2mm. The screw is divided into 5 sections, the temperature is 180°C, 180°C, 170°C, 160°C, 150°C respectively, and the mold temperature is 40°C. The injection time is 3s, the holding time is 60s, and the cooling time is 10s. The injection pressure is 5 MPa, the screw speed is 45 rpm, and the back pressure is 0.2 MPa.

[0065]Two-dimensional X-ray diffraction method was used to quantitatively detect the residual principal stress of the injected diaphragm. At the position to be measured, adjust the detector rotation angle until a sample diffraction arc reaches the middle position of the detector (at this time, the X-ray incident angle and the detector acceptance angle are both 18°), set the upper and lower thresholds of the X-ray diffractometer paramete...

Embodiment 2

[0071] The polymer material product adopted in this embodiment is polypropylene (brand name is NS06). The polypropylene pellets were injection-molded on a Haitian MA900 injection machine into a diaphragm with a size of 60mm×60mm×2mm. The screw is divided into 5 sections, the temperature is 190°C, 180°C, 170°C, 160°C, 150°C respectively, and the mold temperature is 40°C. The injection time is 3s, the holding time is 60s, and the cooling time is 10s. The injection pressure is 5 MPa, the screw speed is 45 rpm, and the back pressure is 0.2 MPa.

[0072] Two-dimensional X-ray diffraction method is used to quantitatively detect the residual principal stress of the film. During the detection process, firstly, the injected membrane is placed on the sample stage of the X-ray diffractometer, and the X-ray incident position is adjusted to a certain point on the surface of the injected membrane to be tested. Position, adjust the detector rotation angle until a sample diffraction arc rea...

Embodiment 3

[0077] The polymer material product adopted in this embodiment is polypropylene (brand name is MM20S). The polypropylene pellets were injection-molded on a Haitian MA900 injection machine into a diaphragm with a size of 60mm×60mm×2mm. The screw is divided into 5 sections, the temperature is 190°C, 180°C, 170°C, 160°C, 150°C respectively, and the mold temperature is 40°C. The injection time is 3s, the holding time is 60s, and the cooling time is 10s. The injection pressure is 5 MPa, the screw speed is 45 rpm, and the back pressure is 0.2 MPa.

[0078] Two-dimensional X-ray diffraction method is used to quantitatively detect the residual principal stress of the film. During the detection process, firstly, the injected membrane is placed on the sample stage of the X-ray diffractometer, and the X-ray incident position is adjusted to a certain point on the surface of the injected membrane to be tested. Position, adjust the detector rotation angle until a sample diffraction arc re...

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Abstract

The invention belongs to the field of stress measurement of polymer material products, and specifically discloses a method for quickly detecting residual principal stress of polymer material products.The polymer materials in the polymer material products are oriented semi-crystalline polymer materials. The polymer materials include a crystalline region and an amorphous region. In the presence ofresidual stress, the dependent variables of the crystalline region and the amorphous region are equal, and in an X-ray diffraction spectrum of the polymer materials, there is at least one crystal plane diffraction peak with a half peak width of less than 10 degrees in the range of the diffraction angle of 10-90 degrees. The method is characterized by comprising using two-dimensional X-ray diffraction to obtain an X-ray diffraction arc peak position of the polymer material products, and then fitting according to the X-ray diffraction arc peak position to obtain the magnitude and direction of the residual principal stress of the polymer material products under test. The method provided by the invention can be used to quickly and conveniently detect the magnitude and direction of the residualprincipal stress of the polymer material products.

Description

technical field [0001] The invention relates to the field of stress measurement of polymer material products, in particular to a method for quickly detecting the residual principal stress of polymer material products. Background technique [0002] There will be a certain amount of residual stress inside the polymer material product, and the residual stress will cause warping and damage of the polymer product during the release process. Therefore, it is particularly important to detect and control the residual stress in the product. [0003] At present, the detection methods for the residual stress of polymer material products mainly include layer-by-layer removal method, drilling method, X-ray diffraction method, etc., all of which calculate and detect the residual stress based on the detected strain. Among them, the layer-by-layer removal method is to measure the stress through its bending deformation after physically removing one layer of the material. This method can onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00G01N23/20
CPCG01L5/0047G01N23/20
Inventor 任敏巧郑萃刘宣伯唐毓婧姚雪容张韬毅
Owner CHINA PETROLEUM & CHEM CORP
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