Predictions of Poisson's Ratio in Cross-Ply Laminates Containing Matrix Cracks and Delaminations

    Volume 11, Issue 2 (June 1989)

    ISSN: 0884-6804

    CODEN: CTROAD

    Page Count: 6


    Harris, CE
    Branch head, Mechanics of Materials Branch, NASA Langley Research Center, Hampton, VA

    Allen, DH
    Professor and graduate assistant, Texas A&M University, College Station, TX

    Nottorf, EW
    Professor and graduate assistant, Texas A&M University, College Station, TX

    Abstract

    A damage-dependent constitutive model for laminated composites has been developed for the combined damage modes of matrix cracks and delaminations. The model is based on the concept of continuum damage mechanics and uses second-order tensor valued internal state variables to represent each mode of damage. The internal state variables are defined as the local volume average of the relative crack face displacements. Since the local volume for delaminations is specified at the laminate level, the constitutive model takes the form of laminate analysis equations modified by the internal state variables. Model implementation is demonstrated for Ex and vxy of quasi-isotropic and cross-ply laminates. The model predictions are in close agreement to experimental results obtained for graphite/epoxy laminates.


    Paper ID: CTR10152J

    DOI: 10.1520/CTR10152J

    ASTM International is a member of CrossRef.

    Author
    Title Predictions of Poisson's Ratio in Cross-Ply Laminates Containing Matrix Cracks and Delaminations
    Symposium , 0000-00-00
    Committee D30