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Faculty of Mechanical Engineering, Lj. (FSLJ)
  • Determination of tensile fatigue life of unidirectional CFRP specimens by strand testing
    Miyano, Yasushi ...
    This paper is concerned with the determination of time and temperature dependent uniaxial static-strength and fatigue life of unidirectional carbon fiber reinforced plastics (CFRPs). A novel test ... system has been designed with fan-shaped grip ends to secure the CFRP strands. Constant temperature is maintained in a chamber surrounding the central portion of the CFRP strand only. Tensile strengths for carbon fiber reinforced by epoxy resin (CF/Ep) strands under constant strain-rate (CSR) and fatigue loading were measured at various loading-rates and temperatures. Corresponding experiments were conducted also by the conventional split-disk method using the CF/Ep ring as the specimen. Experimental results from these two methods are compared and discussed. The strand-testing method described in this study provided excellent results of tensile fatigue life in the longitudinal direction of unidirectional CFRPs. Advantages of this method are the small size of the apparatus and its uniaxial state of stress in the test portion of the specimen. Fatigue lives in tension of CF/Ep strands were measured at a single frequency and various temperatures. Assuming the validity of the time-temperature superposition principle, a scheme is presented to draw two sets of master curves for tensile failure stress in fatigue from data measured as previously described. In addition, evidence is presented to support the concept that tensile failure stress in fatigue follows the principle; the shift factor is the same with the matrix resin studied in this work. Further, evidence is presented to support that the tensile failure stress in fatigue obeys the principle with the shift factor for the matrix resin.
    Source: Mechanics of time-dependent materials : an international journal devoted to the time-dependent behaviour of materials and structures. - ISSN 1385-2000 (Vol. 4, no. 2, 2000, 127-137)
    Type of material - article, component part
    Publish date - 2000
    Language - english
    COBISS.SI-ID - 3846939

    Link(s):

    http://dx.doi.org/10.1023/A:1009882709870

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