STP969: Use of R-Curves for Design in the Elastic-Plastic Fracture Mechanics Regime

    Turner, CE
    Professor of materials in mechanical engineering and postdoctoral research assistant, Mechanical Engineering Department, Imperial College, London,

    Etemad, MR
    Professor of materials in mechanical engineering and postdoctoral research assistant, Mechanical Engineering Department, Imperial College, London,

    Pages: 18    Published: Jan 1988


    Abstract

    Prediction of initiation and maximum pressure was made for two geometrically similar pressure vessels with a fivefold difference in size for two choices of steel. The vessels were supposed to contain a semielliptical axial defect in the outer surface of the cylindrical section and were subjected to internal pressure. Discussion is offered on the choice of data from plane-sided or side-grooved pieces and on the definition and geometric variability of the R-curves. Use of a normalized R-curve to allow transfer of data from a sample to the structure, beyond J-controlled growth, is examined and a comparison is made of all these cases. For these examples, the main effect of the choice of toughness data is on the extent of stable growth prior to maximum load.

    Keywords:

    fracture mechanics, crack propagation, J, -integral, mechanical properties, R, -curves, elastic-plastic fracture mechanics, fracture-safe engineering design


    Paper ID: STP33083S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP33083S


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