STP1044: Thermoplastic Matrix Composites: Finite-Element Analysis of Mode I and Mode II Failure Specimens

    Bankert, RJ
    Center for Composite Materials and Structures, Rensselaer Polytechnic Institute, Troy, NY

    Lambropoulos, ND
    Center for Interactive Computer Graphics, Rensselaer Polytechnic Institute, Troy, NY

    Shephard, MS
    Center for Interactive Computer Graphics, Rensselaer Polytechnic Institute, Troy, NY

    Sternstein, SS
    Center for Composite Materials and Structures, Rensselaer Polytechnic Institute, Troy, NY

    Pages: 18    Published: Jan 1989


    Abstract

    A finite-element analysis was conducted to evaluate the stress distributions within Mode I and Mode II failure specimens, assuming both isotropic and orthotropic elastic material properties. The effects of anisotropy on both the magnitude and the location of the highest stress concentration at the vicinity of the crack tip are significant. The results from modeling realistic blunt crack tip geometry and resin-rich zones imply that local variations in the microstructure strongly influence the stress state near the crack tip and therefore the measured fracture properties. In addition, the features of a viscoelastic model for thermoplastic matrices are described. This model will be used in future investigations of matrix-dominated failure phenomena.

    Keywords:

    Mode I failure, Mode II failure, anisotropy, orthotropic model, isotropic matrix material, fiber waviness, matrix viscoelasticity, resin-rich zones


    Paper ID: STP24596S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP24596S


    CrossRef ASTM International is a member of CrossRef.