STP568

    Comparison of Residual Strength of Composite and Metal Structures after Ballistic Damage

    Published: Jan 1975


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    Abstract

    The residual static and impact fracture strengths of boron/epoxy laminates were obtained from tests using .30 and .50-caliber AP and 23-mm API projectiles. These strengths were compared to the static fracture and impact fracture strengths of 6A1-4V titanium, 7075-T6 aluminum, and 2024-T81 aluminum. Results have shown that the boron/epoxy system possesses residual and impact fracture tension strengths as high or higher than those exhibited by metals of similar strength, when maximum structural damage envelopes are considered. All testing was performed using composite panel thicknesses and projectile diameters which resulted in thickness to diameter ratios in the range, 0.051 < T/D < 0.153.

    Keywords:

    composite materials, damage, impact tests, ballistics, aircraft, composite structures


    Author Information:

    Suarez, JA
    Grumman Aerospace Corporation, Bethpage, N.Y.

    Whiteside, JB
    Grumman Aerospace Corporation, Bethpage, N.Y.


    Paper ID: STP33151S

    Committee/Subcommittee: D30.02

    DOI: 10.1520/STP33151S


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