STP1334: Laboratory Cyclic fatigue Test of Silicone Sealant Mini-Specimens

    Lacasse, MA
    Research officer, Laboratory assistant, and Technical officer, National Research Council Canada, Institute for Research in Construction, Materials Laboratory, Ottawa, Ontario

    Giffïn, GB
    Research officer, Laboratory assistant, and Technical officer, National Research Council Canada, Institute for Research in Construction, Materials Laboratory, Ottawa, Ontario

    Margeson, JC
    Research officer, Laboratory assistant, and Technical officer, National Research Council Canada, Institute for Research in Construction, Materials Laboratory, Ottawa, Ontario

    Pages: 15    Published: Jan 1998


    Abstract

    Mini-specimens of silicone based construction sealant having dimensions 2.5x2.5x10-mm were subjected to cyclical movements using manually adjusted vises according to a procedure previously used to assess the performance of standard model sealant specimens. Failure probability analysis using Weibull probability plots allowed quantitative prediction of sealant lifetime. Comparison of the results to those obtained with standard model sealant specimens demonstrated that the fatigue behavior of the smaller samples is reasonably similar to that of the standard and larger specimens, although further work would be required to perfect the technique. Additional work to enhance the method would be warranted since the mini-specimen methodology is shown to offer preparation ease, reduced curing time, increased sample numbers for enhanced reliability results, and greater flexibility for adaptation to completely automated testing procedures.

    Keywords:

    accelerated testing, cyclic fatigue testing, mini-specimens, reliability analysis, silicone, sealants, sealant fatigue behavior, Weibull distribution, Weibull analysis


    Paper ID: STP15666S

    Committee/Subcommittee: C24.40

    DOI: 10.1520/STP15666S


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