STP1321: Finite Element Analysis on the Fracture of Rubber Toughened Polymer Blends

    Wu, Y
    Visiting Scholar and Professor, University of Sydney, Sydney, NSW

    Wu, J
    Lecturer, Hong Kong University of Science & Technology,

    Mai, Y-W
    Visiting Scholar and Professor, University of Sydney, Sydney, NSW

    Pages: 14    Published: Jan 1997


    Abstract

    The effect of rubber particle volume fraction on the constitutive relation and fracture toughness of polymer blends was studied using elastic-plastic Finite Element Analysis (FEA). The effect of rubber particle cavitation on the stress-strain state at a crack tip was also investigated. Stress analysis reveals that because of the high rubber bulk modulus, the hydrostatic stress inside the rubber particle is close to that in the adjacent matrix material element. As a result, the rubber particle imposes a severe plastic constraint to the surrounding matrix and limits its plastic strain. Rubber particle cavitation can effectively release the constraint and enable large scale plastic strain to occur. Different failure criteria were used to determine the optimum rubber particle volume fraction for the polymer blends studied in this paper.

    Keywords:

    polymer blends, rubber cavitation, plastic constraint, matrix shear yielding, hydrostatic stress, fracture toughness, finite element analysis


    Paper ID: STP12336S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP12336S


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