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Method for rapidly evaluating slow crack growth resistance of plastic pipe material

A slow-crack-resistant, plastic-pipe technology, applied in strength characteristics, analysis materials, preparation of test samples, etc., can solve the problems of long test time, harsh experimental conditions, high cost, etc., and achieve low test cost and good reproducibility , high precision effect

Pending Publication Date: 2018-07-24
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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Problems solved by technology

[0005] Existing conventional test methods such as notched tube test, fully notched tensile creep test, Pennsylvania tensile test, cone test, and notched ring test have harsh experimental conditions, high cost, long test time, poor test result stability, and inability to Defining the failure mode is the brittle failure mode caused by the slow crack growth of the pipe, which seriously hinders the development speed of the new generation of special resin

Method used

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  • Method for rapidly evaluating slow crack growth resistance of plastic pipe material

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Embodiment Construction

[0029] The method for quickly evaluating the slow crack growth resistance of plastic pipes in this embodiment includes two steps of sample preparation and tensile testing.

[0030] The equipment used in the sample preparation process includes plastic injection molding machines, slicers, and crack presetting machines. The specific preparation process is as follows:

[0031] (1) Put the raw material of the plastic pipe into the plastic injection molding machine, and inject to make a cylindrical rod.

[0032] (2) Use a slicer to cut the cylindrical rod. The size of the cut cylindrical rod is: 12-20mm in diameter and 80-130mm in length. The preferred size is: 13-15mm in diameter and 95-110mm in length .

[0033] (3) Utilize the crack presetting machine to preset notch cracks on the cylindrical rod, the speed of the blade feed is 0.05~0.06mm / circle, preferably, the direction of the notch crack is perpendicular to the axial direction of the cylindrical rod, and the depth is 1.3 ~ ...

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Abstract

The invention relates to a method for rapidly evaluating the slow crack growth resistance of a plastic pipe material. The method comprises two steps of preparing a test sample and performing tensile test, wherein a cylindrical test sample is obtained by performing injection molding and presetting notch crack, the cylindrical test sample is subjected to cyclic tensile test by a tensile force changed in sinusoidally, and a relation function of failure time and stress range is obtained and is used for evaluating the slow crack growth resistance of the cylindrical test sample. The method providedby the invention has the advantages of short test time, low cost and high result reproducibility.

Description

technical field [0001] The invention relates to a method for evaluating the performance of plastic pipes, in particular to a method for rapidly evaluating the slow crack growth resistance of plastic pipes. Background technique [0002] At present, more and more pipe products represented by polyethylene, polyvinyl chloride, and polypropylene are used in municipal and construction fields. These materials have the characteristics of good flexibility, strong ductility, corrosion resistance, easy construction, and earthquake resistance. , as water and gas pipeline materials have been widely recognized. As the modern industry has higher and higher requirements on the service life and pressure resistance level of plastic pipe products, raw material manufacturers and production enterprises have been exploring and developing plastic raw materials and pipe products with higher pressure resistance level and better comprehensive performance. The resistance to damage caused by slow crac...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N1/28
CPCG01N1/286G01N3/08G01N2203/0017G01N2203/0274
Inventor 杨波翟伟李茂东王志刚黄国家丁金森张双红李仕平伍振凌何颖怡喻文笪菁
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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