Brunner, A. J.

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Brunner, A. J.
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Brunner, A. J.

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  • Publication
    Mode I delamination fatigue crack growth in unidirectional fiber reinforced composites: development of a standardized test procedure
    (Elsevier, 2012-06)
    Stelzer, S. 
    ;
    Brunner, A. J. 
    ;
    Argüelles, A. 
    ;
    et al. 
    Selected mode I fatigue data from five different types of fiber-reinforced, polymer-matrix composites tested in two round robins organized by the American Society for Testing and Materials subcommittee D30.06 and European Structural Integrity Society Technical Committee 4, respectively, are analyzed and discussed. The focus is on experimental scatter (inlaboratory and inter-laboratory) and on schemes for quantitative data analysis. It is shown that in spite of considerable scatter different composites can be distinguished and, under certain assumptions, a relative ranking be established. Further, effects from limited experimental measurement resolution are noted and implications for the test procedure and use of the test data in design of composite structures discussed. For comparative purposes, a rough ranking of different composites is feasible with test data generated within 24 hours per specimen in an industrial test environment.
      1096Scopus© Citations 66
  • Publication
    Mode I delamination fatigue crack growth in unidirectional fiber reinforced composites: Results from ESIS TC4 round-robins
    (Elsevier, 2014-01)
    Stelzer, S. 
    ;
    Brunner, A. J. 
    ;
    Argüelles, A. 
    ;
    et al. 
    Two round robins on mode I fatigue delamination propagation organized by Technical Committee 4 of the European Structural Integrity Society compared three unidirectional carbon fiber reinforced composites, one with thermoplastic (poly-ether-ether-ketone) and two with thermoset (epoxy) matrix tested at five laboratories. Different approaches for data evaluation and their effect on the in- and inter-laboratory scatter are discussed and compared. Calculated delamination rates da/dN and applied GImax from displacement controlled tests are sensitive to small scatter in the load signal, and, therefore, a new route to evaluate the crack growth rate from pairs of load and displacement data is presented.
      742Scopus© Citations 70