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    Method and Models for R-Curve Instability Calculations

    Published: 01 January 1990

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    This paper presents a simple method for performing elastic R-curve instability calculations. For a single material-structure combination, the calculations can be done on some pocket calculators. On microcomputers and larger, it enables the development of a comprehensive program having libraries of driving-force equations for different configurations and R-curve model equations for different materials. The paper also presents several model equations for fitting to experimental R-curve data, both linear elastic and elasto-plastic. The models are fit to data from the literature to demonstrate their viability.


    R, -curve, J-R, curves, instability, elastic-plastic fracture, fracture tests, data reduction, mathematical models

    Author Information:

    Orange, TW
    Research Engineer, NASA Lewis Research Center, Cleveland, OH

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP19013S