A methodology has been proposed to improve the prediction of long-term hydrostatic strength in loop stress testing of plastic pipe. The methodology consists of diagnostic methods for assessing the adequacy of stresslife relationships. For an inadequate log-log relationship it proposes a systematic variable transformation methodology for finding the most appropriate model to be used for extrapolating hoop stress over time. The proposed methodology may appear to require an excessive amount of data treatment. With adequate computer software, however, this is not the case. A state of the art regression program will not only enable a number of regression analyses to be run on a single pass, but will also generate all necessary graphics, including various residual plots for each fitted regression equation. Even with less sophisticated computer software, however, the cost of generating stress rupture data is high enough to warrant a considerable expenditure of time for data analysis.


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    Title :

    A reassessment of the strength-failure time regression extrapolation for estimating the long-term strength of plastic pipe


    Additional title:

    Eine Wiederberechnung der Festigkeitsverlustzeit-Regressionsextrapolation zur Abschaetzung der Langzeitfestigkeit von Kunststoffrohr


    Contributors:


    Publication date :

    1980


    Size :

    5 Seiten, 7 Bilder, 2 Tabellen, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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