Experimental study of stress cracking in high density polyethylene pipes

The experimental study conducted for this article was made using the butt fusion welding procedure for high density polyethylene (HDPE) pipes. PE100 (SDR 17, PN 10) water pipes were used, as for the experimental study parts of around 200 to 300 mm were welded, using different welding parameters. The influence of the welding parameters on the pipes resistance was analyzed, through visual examination and experimental tests such as tensile, bending and pressure tests.

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Stress Crack Resistance of Corrugated High-Density Polyethylene Pipes in Different Test Environments and Temperatures

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198105192800123 ◽

2005 ◽

Vol 1928 (1) ◽

pp. 220-225 ◽

Cited By ~ 2

Author(s):

Y. Grace Hsuan ◽

Jingyu Zhang

Keyword(s):

Crack Resistance ◽

High Density Polyethylene ◽

Stress Test ◽

Standard Test ◽

High Density ◽

Cracking Behavior ◽

Stress Cracking ◽

Polyethylene Pipes ◽

Hdpe Pipe ◽

Cracking Process

Corrugated high-density polyethylene (HDPE) pipe 36 in. (900 mm) in diameter was evaluated for its stress crack resistance with the notched constant ligament stress test (ASTM F 2136). Test specimens were taken directly from the pipe liner to include the processing effects. In addition to the standard test condition of 10% Igepal solution at 50°C, tests were performed in water and air at temperatures of 60°, 70°, and 80°C. The test data were analyzed with the ISO 9080 method to define the transition point and ductile-to-brittle curve. The results indicate that the 10% Igepal solution greatly accelerates the stress cracking process, whereas the stress cracking behavior in water and in air is aggressive and practically the same. Activation energies in both ductile and brittle portions of the curve are in general agreement with the literature for HDPE resins. The results indicate that the rate processing method is an accurate model with which to extrapolate data from elevated test temperatures to lower service temperatures. However, Popelar's shift method tends to overestimate the failure times.

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Effect of flow forming on mechanical properties of high density polyethylene pipes

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2015.06.014 ◽

2015 ◽

Vol 19 ◽

pp. 155-162 ◽

Cited By ~ 9

Author(s):

Amin Abedini ◽

Payam Rahimlou ◽

Taghi Asiabi ◽

Samrand Rash Ahmadi ◽

Taher Azdast

Keyword(s):

Mechanical Properties ◽

High Density Polyethylene ◽

High Density ◽

Flow Forming ◽

Polyethylene Pipes

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MECHANICAL CHARACTERIZATION OF PA 12 AND HDPE PIPES BEFORE AND AFTER AGING IN WATER AT TWO DIFFERENT TEMPERATURES

International Journal of Research -GRANTHAALAYAH ◽

10.29121/granthaalayah.v9.i1.2021.2973 ◽

2021 ◽

Vol 9 (1) ◽

pp. 248-256

Author(s):

J.A. dos Santos ◽

R.C. Tucunduva ◽

J.R.M. D’Almeida

Keyword(s):

High Density Polyethylene ◽

Mechanical Performance ◽

High Density ◽

Effect Of Temperature ◽

Polyamide 12 ◽

Polyethylene Pipes ◽

Before And After ◽

Different Temperatures ◽

Deterioration Process ◽

Combined Action

Polymer pipes are being widely used by many industrial segments. Although not affected by corrosion, the mechanical performance of these pipes can be reduced due to exposure to temperature, UV radiation and by contact with various fluids. Depending on the deterioration process, embrittlement or plasticization may occur, and the service life of the pipe can be severely reduced. In this work, the combined action of temperature and water upon the mechanical performance of polyamide 12 and high-density polyethylene pipes is evaluated. Destructive and non-destructive techniques were used and the performance of both materials was compared. Both polymers were platicized by the effect of water. However, for high density polyethylene the effect of temperature was more relevant than for polyamide. This behavior was attributed to the dependence of the free volume with the markedly different glass transition temperature of the polymers and the temperatures of testing.

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Studies and Research on the Behavior of Polyethylene when Electrofusion Welding Fittings to High Density Polyethylene Pipes

Materiale Plastice ◽

10.37358/mp.21.1.5448 ◽

2021 ◽

Vol 58 (1) ◽

pp. 85-98

Author(s):

Eugen Avrigean

Keyword(s):

High Density Polyethylene ◽

Welding Process ◽

High Density ◽

Polyethylene Pipes ◽

The Way

This aim of this paper is to perform a study on the way the material of the fittings that can be welded through eletrofusion on polyethylene pipes withstands. The process is observed by means of the thermal and fast cameras. Also we intend to analyze the way the assembly consisting of the polyethylene fitting and pipe behaves during welding. The stresses caused by the welding process are observed, as well as the concurrent welding of the tapping tee and the branch saddle tee.

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