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    Statistical Design and Analysis of an Interlaboratory Program on the Fatigue Properties of Welded Joints in Structural Steels

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    The constant-amplitude fatigue behavior of welded joints in two types of normalized structural high-strength steel has been studied in an interlaboratory program within the European community. The statistical design and analysis of a part of that program is described. This part was aimed at establishing complete S-N curves for three types of fillet welded joints with reference to a comprehensive statistical test plan. The test plan closely linked the activities of six laboratories involved in testing and three welding institutes fabricating the specimens under specified conditions, and it organized the repartition of the specimens to the stress levels to be applied and to the laboratories. Some restrictions, however, were imposed on the test plan due to limitations in test load capacity in some of the laboratories and to limitations in time and costs.

    The results were evaluated according to the concept followed in planning, using various methods of analysis that were outlined and compared in treating the 753 test results available and in deducing characteristic figures of the fatigue strength at 2·106 cycles. The assumption of a “uniform” slope of S-N curves for welded joints in structural steel proved to be reasonable. Moreover, it was possible to analyze the additional variability of the results caused by sharing the tests at each stress level among several laboratories or caused by fabricating equal portions of the specimens in three welding institutes.


    fatigue tests, (complete) , S-N, curves, welded joints, structural steel, statistical test plan, (comparative) statistical analysis, laboratory effects, welding effects, material effects, fatigue

    Author Information:

    Haibach, E
    Director and research fellow, Fraunhofer-Institut für Betriebsfestigkeit (LBF), Darmstadt,

    Olivier, R
    Director and research fellow, Fraunhofer-Institut für Betriebsfestigkeit (LBF), Darmstadt,

    Rinaldi, F
    Head of research laboratory, Dalmine SpA, Laboratori di Ricerca, Bergamo,

    Committee/Subcommittee: E08.01

    DOI: 10.1520/STP29327S