Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for rapid detection of residual principal stress of polymer material products

A technology of polymer materials and principal stress, applied in the analysis of materials, material analysis using wave/particle radiation, material analysis using radiation diffraction, etc., can solve problems such as sample center offset and calculation result errors

Active Publication Date: 2021-08-03
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for rapid detection of residual principal stress of polymer material products
  • A method for rapid detection of residual principal stress of polymer material products
  • A method for rapid detection of residual principal stress of polymer material products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The polymer material article employed in this embodiment is polyethylene (a grade TR480M). The polyethylene pellets were injected on the sea day MA900 injection into a diaphragm and a size of 60 mm × 60 mm × 2 mm. The screw is 5 segments, and the temperature is 180 ° C, 180 ° C, 170 ° C, 160 ° C, 150 ° C, 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]The residual main stress of the injection diaphragm was quantitatively detected by a two-dimensional X-ray diffraction method. During the detection process, the injection film sheet was first placed in a sample stage of the X-ray diffraction, and the X-ray incident position is adjusted to the surface of the injection film. To be tested, adjust the detector angle to a sample diffraction arc to the intermediate position of the detector (at this time, the X-ray ...

Embodiment 2

[0071] The polymer material articles employed in this example are polypropylene (grades NS06). The polypropylene pellets were injected into a diaphragm on the sea day MA900 injection, and the size was 60 mm × 60 mm × 2 mm. The screw is 5 segments, and the temperature is 190 ° C, 180 ° C, 170 ° C, 160 ° C, 150 ° C, 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] The residual main stress of the film was quantitatively detected by a two-dimensional X-ray diffraction method. During the detection process, the injection film sheet was first placed in a sample stage of the X-ray diffraction instrument, and the X-ray incident position to the surface of the injection film surface. Location, adjustment detector angle to a sample diffraction arc to reach the intermediate position of the detector (at this time, the X-ray inc...

Embodiment 3

[0077] The polymer material articles employed in this example are polypropylene (grades MM20S). The polypropylene pellets were injected into a diaphragm on the sea day MA900 injection, and the size was 60 mm × 60 mm × 2 mm. The screw is 5 segments, and the temperature is 190 ° C, 180 ° C, 170 ° C, 160 ° C, 150 ° C, 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] The residual main stress of the film was quantitatively detected by a two-dimensional X-ray diffraction method. During the detection process, the injection film sheet was first placed in a sample stage of the X-ray diffraction instrument, and the X-ray incident position to the surface of the injection film surface. Location, adjustment detector angle to a sample diffraction arc to reach the intermediate position of the detector (at this time, the X-ray in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Poisson's ratioaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of stress measurement of polymer material products, and specifically discloses a method for quickly detecting the residual principal stress of polymer material products. The polymer material in the polymer material product is an oriented semi-crystalline polymer material. The polymer material includes a crystalline region and an amorphous region, and in the presence of residual stress, the strains of the crystalline region and the amorphous region are equal, and in the X-ray diffraction spectrum of the polymer material, the diffraction angle is 10 In the range of 90° to 90°, there is at least one crystal plane diffraction peak whose half-peak width is less than 10°, wherein the method includes obtaining the X-ray diffraction arc peak position of the polymer material product by using a two-dimensional X-ray diffraction method, and then According to the X-ray diffraction arc peak position fitting, the magnitude and direction of the residual principal stress of the polymer material product to be tested are obtained. The method provided by the invention can quickly and conveniently detect the magnitude and direction of the residual principal stress of the polymer material product.

Description

Technical field [0001] The present invention relates to the field of stress measurement of polymer material, and in particular, to a method of rapidly detecting residual main stress of polymer material articles. Background technique [0002] There will be some residual stress inside the polymer material article, and the residual stress will cause a high molecular product to warp, damage during the release process. Therefore, the residual stress in the test and control articles is particularly important. [0003] At present, the detection method of residual stress of polymer material products mainly has a layer-by-layer removal method, a drilling method, an X-ray diffraction method, and the like, which are calculated according to the strain of detection to detect residual stress. Among them, after layer-by-layer removal method, the material is physically removed, and the stress size can be measured by its curved deformation, which can only be used to determine the residual stress ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00G01N23/2055
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com