Intrinsic Lifetime of Polyethylene Pipelines
نویسنده
چکیده
An equation was developed for calculating the time to failure by slow crack growth (SCG) failure in any polyethylene structure. The equation requires the following experimental inputs: (1) the resistance to SCG as measured by the PENT test (ASTM F1473), (2) the stress intensity of the defect from which failure originates, and (3) the temperature. A simple experiment for determining the stress intensity is presented. The equation was applied to SCG failures that are associated with the inherent random defects that occur in the wall of all pipes. The size of the inherent random defect that exists in commercial gas pipes was found to be 0.14 mm. Comments Postprint version. Published in Polymer Engineering and Science, Volume 47, Issue 4, April 2007, 477-480. Publisher URL: http://dx.doi.org/10.1002/pen.20696 This journal article is available at ScholarlyCommons: http://repository.upenn.edu/mse_papers/131 Intrinsic Lifetime of Polyethylene Pipelines * Norman Brown ** Department of Materials Science and Engineering University of Pennsylvania Abstract An equation was developed for calculating slow crack growth [SCG] failure in any polyethylene structure. The equation requires the following experimental inputs: (1) the resistance to SCG as measured by the PENT test (ASTM F1473), (2) the stress intensity of the defect from which failure originates, (3) the temperature. A simple experiment for determining the stress intensity is presented. The equation was applied to SCG failures that are associated with the inherent random defects that occur in the wall of all pipes. The size of the inherent random defect that exists in commercial gas pipes was found to be 0.14 mm.An equation was developed for calculating slow crack growth [SCG] failure in any polyethylene structure. The equation requires the following experimental inputs: (1) the resistance to SCG as measured by the PENT test (ASTM F1473), (2) the stress intensity of the defect from which failure originates, (3) the temperature. A simple experiment for determining the stress intensity is presented. The equation was applied to SCG failures that are associated with the inherent random defects that occur in the wall of all pipes. The size of the inherent random defect that exists in commercial gas pipes was found to be 0.14 mm. * Peer reviewed for publication in journal of Polymer Engineering and Science ** Professoremail [email protected] 1
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