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    STP1285

    On the Determination of Tensile and Compressive Strengths of Unidirectional Fiber Composites

    Published: 0


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    Abstract

    Stress fields in tabbed unidirectional composite coupons and in cross-ply specimens are examined with a goal towards improving the methods for determining the axial strengths of the unidirectional material. Results of parametric studies for evaluation of the influence of tab materials and geometries as well as adhesive properties on the stress peaks in unidirectional tension coupons are presented. Use of ductile (but tough) adhesives, soft tabs, and low taper angles is recommended to reduce failures near tab ends.

    Data reduction schemes for evaluation of cross-ply test data are critically examined with due consideration to subcritical damages (such as ply cracks) and expected failure modes. Test results from cross-ply and unidirectional tension and compression specimens of carbon and glass-fiber composites are compared. Some recommendations are made based on the results reported. Tests and data correlations for other composites are suggested for selecting a data reduction scheme acceptable to the composites community.

    Keywords:

    unidirectional fiber composites, tensile strength, tab effects, adhesive nonlinearity, cross-ply tension, ply cracks, cross-ply compression, data analysis, fatigue (materials), fracture (materials), composite materials


    Author Information:

    Chatterjee, SN
    Staff scientist and research engineer, Materials Sciences Corporation, Fort Washington, PA

    Yen, C-F
    Staff scientist and research engineer, Materials Sciences Corporation, Fort Washington, PA

    Oplinger, DW
    Federal Aviation Administration, FAA Technical Center, Atlantic City International Airport, NJ


    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP19929S