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Biaxial failure envelope and creep testing of fibre reinforced plastic pipes in high temperature aqueous environments

Lookup NU author(s): Dr Jack Hale, Professor Geoff Gibson, Dr Stephen Speake


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Results are presented for a series of tests on filament wound glass fibre reinforced pipes which have been subject to prolonged exposure to high temperature water. Two materials systems in common use in offshore piping applications are tested: continuous fibre e-glass in a phenolic and an epoxy resin matrix, respectively. This is the first work on this type on water saturated GRP at very high temperatures up to 160degreesC. The results of water absorption tests on the two material systems at 95degreesC are presented. It is shown that saturated conditions can be achieved within seven days at this temperature. Creep modulus test results for the two material systems as a function of temperature up to 160degreesC are presented. The reduction in T-G for the epoxy material in the saturated state is quantified and it is shown that the phenolic material is largely unaffected by water absorption. The results of biaxial tensile loading tests for the two material systems are presented in the form of failure envelopes at temperatures from 20 to 160degreesC The considerable weakening of the epoxy system, particularly under the matrix dominated loading conditions, is quantified and it is shown that the failure envelope for the phenolic system is largely unaffected by temperature. Finally, a comparison is made between the two materials as a function of loading condition and temperature as a design guide.

Publication metadata

Author(s): Hale J; Speake SD; Gibson AG

Publication type: Article

Publication status: Published

Journal: Journal of Composite Materials

Year: 2002

Volume: 36

Issue: 3

Pages: 257-270

Print publication date: 01/01/2002

ISSN (print): 0021-9983

ISSN (electronic): 1530-793X

Publisher: Sage Publications Ltd.


DOI: 10.1106/002199802023516


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