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Puncture resistance of pressurized and unpressurized glass reinforced Epoxy (GRE) pipes : a phenomenological model of failure mechanisms

Griffiths, James & Gudimetla, Prasad V. (2008) Puncture resistance of pressurized and unpressurized glass reinforced Epoxy (GRE) pipes : a phenomenological model of failure mechanisms. AIJST -Asian International Journal of Science and Technology : Production and Manufacturing, 1(2), pp. 41-50.

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Abstract

Glass reinforced ethylene (GRE) pipes are widely used in the oil and gas sector in Australia owing to their economical/competitive life cycle costs. However, as with all pipelines, GRE pipes face significant risks of external interference by earthmoving equipment where mechanical insult is the result of approximately 50% of pipeline failures. Mechanical tests on un-pressurised pipes were conducted on thick and thin walled GRE pipe samples rated to ANSI Class 600 at different loading rates to study the failure mechanisms. Localised failures due to combined bending and shear with severe delamination under the indenter were observed in thick wall GRE whereas thin walled GRE pipes failed due to buckling away from the point of impact. The finite element analyses results show that GRE pipes fail due to a combination of bending and direct shear at the p oint of impact. Further, the failures are functions of the angle of impact and the tip geometry. The magnitude of puncture resistance as well as the location of failure and failure mechanisms were all found to be highly dependent on the pipe wall thickness and applied internal pressure. GRE pipes exhibited 55 to 75% less resistance to puncture as compared with steel pipes of same wall thickness. Hence, most commercially available excavators have the potential to penetrate GRE pipes, so alternative methods must be employed to reduce this risk.

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ID Code: 16821
Item Type: Journal Article
Additional Information: Access to the author-version is currently restricted pending permission from the publisher. For more information, please refer to the journal's website (see hypertext link) or contact the author.
Keywords: Glass Reinforced Epoxy (GRE), Puncture Resistance, Internal Pressure, Point Loading, Finite Element Analysis
ISSN: 1906-151X
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Composite and Hybrid Materials (091202)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2008 King Mongkut's University of Technology North Bangkok
Deposited On: 12 Dec 2008 07:17
Last Modified: 09 Jun 2010 23:14

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