STP937

    The Characterization of Edge Delamination Growth in Laminates Under Fatigue Loading

    Published: Jan 1987


      Format Pages Price  
    PDF Version (300K) 20 $25   ADD TO CART
    Complete Source PDF (8.2M) 20 $76   ADD TO CART


    Abstract

    It is generally accepted that the onset and stable growth of edge delaminations under quasi-static loading can be characterized using the strain energy release rate G and delamination resistance curves (R curves). This study addresses the problem of edge delamination growth under fatigue loading. To characterize the fatigue growth successfully, it is shown that it is not sufficient to consider only the maximum energy (Gmax) released as the delamination grows. Instead, the energy released must be compared to the increasing resistance to further growth. This increasing resistance to delamination grwoth GR can be explained best in terms of the associated matrix cracking, which is observed under both static and fatigue loading. Using results from a [±30/±30/90/9¯0]s T300-5208 and a [45/0/−45/90]s XAS-914 graphite-epoxy laminate, separate power law correlations between the edge delamination fatigue growth rates and the term (Gmax/GR) are obtained. The measured exponents are in the range 4.1 to 6.

    Keywords:

    composite materials, graphite-epoxy, delamination, matrix cracking, stiffness loss, fracture mechanics, strain energy release rate, R, curve, fatigue, growth law


    Author Information:

    Poursartip, A
    Assistant professor, The University of British Columbia, Vancouver, B.C.,


    Paper ID: STP24380S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP24380S


    CrossRef ASTM International is a member of CrossRef.