Testing method and testing system of effective stress of polyethylene under ideal non-damage state

A technology of effective stress and testing method, applied in the direction of applying stable tension/pressure to test material strength, measuring devices, instruments, etc., can solve the problems of complex implementation and inapplicable damage testing, and achieve simple implementation and overcome the range of sampling size restrictions, high economic efficiency

Active Publication Date: 2019-01-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

But its significant disadvantage is: the implementation is more complicated, and it is not suitable for damage testing of polyethylene (PE) materials
However, for PE materials, the stress-strain relationship under tension and compression conditions is very different, so the existing methods cannot be directly used to measure PE materials

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Embodiment Construction

[0018] Certain terms are used, for example, in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred implementation mode for implementing the application, but the description is for the purpose of illustrating the general principle of the application, and is not intended...

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Abstract

The invention discloses a testing method and a testing system of effective stress of polyethylene under an ideal non-damage state. The method comprises the following steps: quantificationally introducing polyethylene material damage through a tensile testing machine; testing a damage parameter of the polyethylene material according to the damage, and consequently determining effective stress underthe ideal non-damage state. The method and the system provided by the invention has the advantages of being simple to realize, introducing the polyethylene material damage through the tensile testingmachine, testing the damage parameter of the polyethylene material according to the damage and consequently determining the effective stress under the non-damage state. Limit to a range of sampling size in the conventional microscopic damage test method is overcome, and dependence on a microscopic technology with high precision, complex operations and high cost is avoided. A defect of being not suitable for the polyethylene of the conventional method is remedied, a polyethylene material damage and failure mechanism and evolution law research especially suitable for the polyethylene material is used, and reliable method support can be provided for polyethylene damage and fracture representation and calculation simulation in the fields, such as experimental mechanics and numerical simulation.

Description

technical field [0001] The invention relates to a method and system for testing the effective stress of polyethylene in an ideal non-destructive state. Background technique [0002] Polyethylene (PE) material is widely used in the manufacture of drainage and gas pipelines due to its excellent corrosion resistance, ductility, and low manufacturing and maintenance costs. According to statistics from the Pipeline and Hazardous Materials Safety Administration of the U.S. Department of Transportation, more than 90% of newly installed gas pipelines in the United States are made of PE materials in 2017, which has produced huge economic and social benefits, but also faces a series of serious safety issues. Due to material defects, third-party damage, and pipeline foundation movement, PE pipeline failures, damages, and even explosions and other serious accidents occur from time to time. [0003] The finite element method based on the continuum damage model is an effective means to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0676
Inventor 张毅薛世峰李琳韩丽美贾朋朱秀星叶贵根
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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