STP1110

    Effects of Stacking Sequence on Impact Damage Resistance and Residual Strength for Quasi-Isotropic Laminates

    Published: Jan 1991


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    Abstract

    Residual strength of an impacted composite laminate is dependent on details of the damage state. Stacking sequence was varied to judge its effect on damage caused by low-velocity impact. This was done for quasi-isotropic layups of a toughened composite material. Experimental observations on changes in the impact damage state and post-impact compressive performance were presented for seven different laminate stacking sequences. The applicability and limitations of analysis compared to experimental results were also discussed.

    Post-impact compressive behavior was found to be a strong function of the laminate stacking sequence. This relationship was found to depend on thickness, stacking sequence, size, and location of sublaminates that comprise the impact damage state. The post-impact strength for specimens with a relatively symmetric distribution of damage through the laminate thickness was accurately predicted by models that accounted for sublaminate stability and in-plane stress redistribution. An asymmetric distribution of damage in some laminate stacking sequences tended to alter specimen stability. Geometrically nonlinear finite element analysis was used to predict this behavior.

    Keywords:

    composite materials, impact, graphite/epoxy, stacking sequence, residual strength prediction, compression after impact strength, toughened matrix, pulse-echo ultrasonics, fracture, fatigue (materials)


    Author Information:

    Dost, EF
    Specialist engineer, senior specialist engineer, and senior specialist engineer, The Boeing Company, Seattle, WA

    Ilcewicz, LB
    Specialist engineer, senior specialist engineer, and senior specialist engineer, The Boeing Company, Seattle, WA

    Avery, WB
    Specialist engineer, senior specialist engineer, and senior specialist engineer, The Boeing Company, Seattle, WA

    Coxon, BR
    Director of research, Integrated Technologies, Inc., Bothell, WA


    Paper ID: STP17733S

    Committee/Subcommittee: D30.02

    DOI: 10.1520/STP17733S


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