STP787: Durability/Life of Fiber Composites in Hygrothermomechanical Environments

    Chamis, CC
    Aerospace Structures and Composites Engineer, and Materials Engineer, NASA Lewis Research Center, Cleveland, Ohio

    Sinclair, JH
    Aerospace Structures and Composites Engineer, and Materials Engineer, NASA Lewis Research Center, Cleveland, Ohio

    Pages: 15    Published: Jan 1982


    Abstract

    Statistical analysis and multiple regression were used to determine and quantify the significant hygrothermomechanical (HGTM) variables which influence the tensile durability/life (cyclic loading, fatigue) of boron-fiber/epoxy-matrix (B/E) and high-modulus-fiber/epoxy-matrix (HMS/E) composites. The use of the multiple regression analysis reduced the variables from 15, assumed initially, to 6 or less with a probability of greater than 0.999. The reduced variables were used to derive predictive models for compression and intralaminar shear durability/life of B/E and HMS/E composites assuming isoparametric fatigue behavior. The predictive models were subsequently “generalized” to predict the durability/life of graphite-fiber/resin-matrix composites. The “generalized” model is of simple form, predicts conservative values compared with measured data, and should be adequate for use in preliminary designs.

    Keywords:

    durability, service life, hygrothermomechanical behavior, boron-fiber composites, graphite-fiber composites, moisture, temperature, cyclic loading, fatigue, predictive models


    Paper ID: STP28497S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP28497S


    CrossRef ASTM International is a member of CrossRef.