A Test Fixture for Fully Reversed Axial Fatigue Characterization of Composites

    Volume 36, Issue 4 (July 2008)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 25 March 2008

    Page Count: 6


    Strauch, E. C.
    Applied Research Laboratory, The Pennsylvania State University, State College, PA

    Associate & Assistant Research Engineer,

    Rachau, C. L.
    Applied Research Laboratory, The Pennsylvania State University, State College, PA

    Associate & Assistant Research Engineer,

    Koudela, K. L.
    Applied Research Laboratory, The Pennsylvania State University, State College, PA

    Head,

    (Received 13 June 2007; accepted 19 February 2008)

    Abstract

    Fatigue of fiber-reinforced polymer matrix composites has been studied exhaustedly over the years. However, most fully reversed fatigue testing has concentrated on flexural fatigue. The resulting stress state through the laminate thickness is non-uniform and as such may give rise to unconservative life estimates. Fully reversed (R=−1) axial testing has not been heavily reported due to the difficulties associated with precluding local or global buckling of the axial specimen. The few reported fully reversed axial tests utilize either cylindrical specimens or fixturing that is very large, expensive to fabricate, and difficult to handle. Herein we report on a simple side support fixture that allows the use of standard ASTM tensile test specimens (D3039 or D638, depending on test material), which are readily prepared. The fixture allows fully reversed axial fatigue testing as well as static baseline compression and residual compression strength characterization. Also presented herein are tension-tension (R=0.1) and fully reversed tension-compression (R=−1) S-N diagrams for an E-glass/epoxy composite.


    Paper ID: JTE101288

    DOI: 10.1520/JTE101288

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    Author
    Title A Test Fixture for Fully Reversed Axial Fatigue Characterization of Composites
    Symposium , 0000-00-00
    Committee D30