An Analytical and Experimental Evaluation of 0/90 Laminate Tests for Compression Characterization

    Volume 16, Issue 2 (April 1994)

    ISSN: 0884-6804

    CODEN: CTROAD

    Page Count: 8


    Wilson, DW
    ASHRAE, Inc., Atlanta, GA

    Vinckier, D
    CONDAT GmbH, Scheyern-Fernhag,

    Prandy, J
    American Cyanamid, Anaheim, CA

    Thoma, K
    CONDAT GmbH, Scheyern-Fernhag,

    Maier, M
    Institut für Verbundwerkstoffe, Kaiserslautern,

    Altstädt, V
    BASF AG, Ludwigshafen,

    Abstract

    For materials development and specification, accurate compressive property measurement with low variability is important, especially if the accuracy is improved by elimination of premature failure by buckling. Existing compression test methods do not satisfy these needs. For this reason the effectiveness of using 0/90 laminates for the determination of unidirectional (0°) compressive strength of composites was evaluated. The concept of using 0/90 laminates to evaluate lamina compressive strength exploits the transverse constraint provided by the 90° plies in combination with increased buckling stability obtained by positioning the 0° plies away from the neutral axis.

    The studies were conducted using the SACMA SRM-1 compression tests for several material types that represent a broad range of fiber and matrix performance combinations. Laminate configuration and stacking sequence effects were evaluated over a range of temperatures up to 120°C. Additionally, load introduction factors, including tab type, tab design, and adhesive, were examined for effects on strength.

    Under all conditions evaluated, the [90/0/0/90]s configuration was found to measure higher compressive strengths in the 0° plies than that determined for the same material using 0° coupons. The experimental findings could be explained by a numerical simulation of the SACMA type compression test. The simulation was based on a specially developed materials model designated COMPO-D which was implemented in the finite element code of DYNA-3D. The FEM analysis of the [90/0/0/90]s configuration explains the suppression of stress concentrations resulting in a more homogeneous distribution at the point of failure within the gage area.


    Paper ID: CTR10404J

    DOI: 10.1520/CTR10404J

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    Author
    Title An Analytical and Experimental Evaluation of 0/90 Laminate Tests for Compression Characterization
    Symposium , 0000-00-00
    Committee D30