STP632

    Fracture Toughness Testing Using the C-Shaped Specimen

    Published: Jan 1977


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    Abstract

    Fracture toughness testing of material with cylindrical geometry is discussed, and the inherent advantages of the C-shaped specimen in this situation are given. A K calibration equation for the C-shaped specimen is presented which is based on boundary value collocation results. The C-shaped specimen K calibration is compared with those for the standard compact specimen and the single-edge-notched bar specimen.

    Guidelines for measuring plane-strain fracture toughness (KIc) using the C-shaped specimen are described, including (a) a KI calibration which applies over a wide range of diameter ratios and to two load point locations in segments of hollow cylinders, as well as over a range of crack lengths, (b) compliance and crack-mouth-displacement analyses and their use to obtain critical value of KI in a fracture toughness test, and (c) suggested specimen geometries to be used in performing KIc tests with C-shaped specimens.

    The use of C-shaped specimens for performing J-integral fracture toughness tests and fatigue crack growth tests is described, and some preliminary testing guidelines are offered. Included are suggested methods of load-point-displacement measurement for J-integral tests and suggestions for the geometry and K calibration which could be used in fatigue tests.

    Keywords:

    fracture properties, crack propagation, calibration, toughness, fatigue tests


    Author Information:

    Underwood, JH
    Materials research engineer and research mechanical engineer, U.S. Army Benet Weapons Laboratory, Watervliet, N.Y.

    Kendall, DP
    Materials research engineer and research mechanical engineer, U.S. Army Benet Weapons Laboratory, Watervliet, N.Y.


    Paper ID: STP28698S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP28698S


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