Volume 28, Issue 6 (November 2000)

    Effects of Fixturing Mass on Dynamic Strain Errors in Structural Fatigue Testing

    (Received 22 September 1999; accepted 30 June 2000)

    CODEN: JTEOAD

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    Abstract

    Improvements in control systems have allowed significant increases in testing frequencies for full-scale aircraft structural fatigue tests. This means that it is possible to be testing at frequencies that result in significant dynamic strains, with consequent over-testing.

    This paper presents an analysis of a simple cantilever beam as a representation of a test on an aircraft wing. Using a state space formulation and the MatLab mathematical programming system, comparisons between static and dynamic strains for various locations on the beam are made for a variety of loading arrangements.

    It is shown that significant dynamic strain errors will occur at testing frequencies above about 10% of the first natural frequency of the specimen itself. The errors can increase significantly due to the mass of the fixturing, and are further exacerbated by static counterbalancing.


    Author Information:

    Hewitt, RL
    Senior research officer,, Institute for Aerospace Research, National Research Council of Canada,, Ottawa,, Ontario,


    Stock #: JTE12137J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12137J

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    Author
    Title Effects of Fixturing Mass on Dynamic Strain Errors in Structural Fatigue Testing
    Symposium , 0000-00-00
    Committee D30