STP969: On the Application of R-Curves and Maximum Load Toughness to Structures

    Anderson, TL
    Assistant professor, Texas A & M University, College Station, TX

    Gordon, JR
    Senior research engineer and department head, Fracture Department, The Welding Institute, Abington, Cambridge,

    Garwood, SJ
    Senior research engineer and department head, Fracture Department, The Welding Institute, Abington, Cambridge,

    Pages: 27    Published: Jan 1988


    Abstract

    An approximate procedure is presented which allows a ductile fracture analysis to be performed with a single fracture toughness value measured at maximum load in a small-scale test. This maximum load toughness value is used to predict an R-curve which is then used to predict maximum stress and crack extension. Predictions from this approach are compared with experimental data from 20 wide-plate specimens made from various ductile materials. A limited number of these specimens are also analyzed using experimental R-curves in order to investigate the effect of the assumed shape of the R-curve on predictions. In addition, an analysis is presented which allows one to determine the critical tearing modulus required for a structure to exhibit collapse controlled failure. Potential applications of these analyses are discussed.

    Keywords:

    crack-tip opening displacement, ductile fracture, elastic-plastic fracture, J, -integral, R, -curves, structural analysis, weldments, wide-plate tests, fracture mechanics


    Paper ID: STP33080S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP33080S


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