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TECHNICAL PAPERS

Methodology for Durability Analysis of HDPE Pipe

[+] Author and Article Information
A. Chudnovsky

Department of CME, The University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607

K. Sehanobish, S. Wu

The Dow Chemical Company, Freeport, TX 77541

J. Pressure Vessel Technol 122(2), 152-155 (Dec 15, 1999) (4 pages) doi:10.1115/1.556165 History: Received August 15, 1999; Revised December 15, 1999
Copyright © 2000 by ASME
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References

Lang, R. W., Stern, A., and Doerner, G., 1996, “Applicability and Limitations of Current Lifetime Prediction Models for Thermoplastics Pipes Under Internal Pressure,” 8th Annual International Conference on Advances in the Stabilization and Degradation of Polymers, Switzerland.
Scheirs,  J., , 1996, “PE100 Resins for Pipe Application,” Trends Polym. Sci. 4, No. 12, pp. 408–415.
ISO, 1994, “Thermoplastic Pipes for the Transport of Fluids—Methods of Extrapolation of Hydrostatic Stress Rupture Data to Determine the Long Term Hydrostatic Strength of Thermoplastic Pipe Materials,” ISO/TR 9080, International Organization for Standardization, Geneva, Switzerland.
ISO, 1995, “Thermoplastic Pipes for the Conveyance of Fluids—Determination of the Resistance to Rapid Crack Propagation—Small Scale Steady State (s4),” Draft International standard DIS 13477, International Organization for Standardization, Geneva, Switzerland.
Lang,  R. W., Stern,  A., and Doerner,  G., 1997, “Applicability and Limitations of Current Lifetime Predication Models for Thermoplastics Pipes Under Internal Pressure,” Angew. Makromol. Chem., 247, pp. 131–145.
Sehanobish,  K. , 1985, “Fractographic Analysis of Field Failure in Polyethylene Pipe,” J. Mater. Sci. Lett., 4, pp. 890–894.
Kadota,  K., and Chudnovsky,  A., 1992, “Constitutive Equations of Crack Layer Growth,” Polym. Eng. Sci. 32, 1097.
Chudnovsky,  A., Shulkin,  Y., Baron,  D., and Lin,  K. P., 1995, “New Method of Lifetime Predication for Brittle Fracture of Polyethylene,” J. Appl. Polym. Sci. 56, pp. 1465–1478.
Lu,  X., Qian,  R., and Brown,  N., 1991, “Discontinuous Crack Growth in Polyethylene Under a Constant Load,” J. Mater, Sci. 26, p. 917.
Hertzberg, R. W., and Manson, J. A. 1980, Fatigue of Engineering Plastics, Academic Press, New York, NY.

Figures

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SEM image of fracture surface in pipe HG-900529-1. The primary crack initiation site is located at bottom-center in the figure and is near the inner wall of the pipe.
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Large (∼75-μm-dia) particle located at center of main crack initiation site shown in Fig. 1
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Particle size distribution of defect particles observed from fracture surfaces of two pipes with quite different lifetimes (six times difference) under test
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The defect sizes versus the crack sizes in tested pipes
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Optical and SEM pictures of defects and their interfacial adhesion with the matrix; (a) good interfacial adhesion, and (b) poor interfacial adhesion
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Creep behavior of an HDPE material under the stress of drawing stress
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The creep behavior of the original material separated from Fig. 5
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The creep behavior of the drawn material separated from Fig. 5
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Computer simulation of stress dependence of discontinuous crack layer growth: (a) low stress level of σ=0.25σdr, (b) high stress level of σ=0.75σdr

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