STP676

    Crack Growth Retardation in Two Low-Strength Materials Under Displacement Controlled Cyclic Loading

    Published: Jan 1979


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    Abstract

    Several experiments have been performed to determine the tolerance to defects of two low-strength materials used on cannon tube components subjected to displacement-controlled fatigue loading. The study was initiated to determine acceptable flaw sizes for hoops used to stabilize large cannons during recoil. A simple specimen was devised to approximate the axisymmetric, displacement-controlled actual loading of hoops. The results show that under this loading, a fatigue failure is not possible in either material because of the combination of the reduced stiffness of the structure containing fatigue cracks and general cross-sectional yielding.

    Keywords:

    fatigue (materials), crack propagation, fracture mechanics, stress relaxation


    Author Information:

    Kapp, JA
    Mechanical engineer, materials engineer, and mechanical engineering technician, Benet Weapons Laboratory, U.S. Army Armament Research and Development Command, LCWSL Watervliet Arsenal, Watervliet, N.Y.

    Underwood, JH
    Mechanical engineer, materials engineer, and mechanical engineering technician, Benet Weapons Laboratory, U.S. Army Armament Research and Development Command, LCWSL Watervliet Arsenal, Watervliet, N.Y.

    Zalinka, JJ
    Mechanical engineer, materials engineer, and mechanical engineering technician, Benet Weapons Laboratory, U.S. Army Armament Research and Development Command, LCWSL Watervliet Arsenal, Watervliet, N.Y.


    Paper ID: STP37423S

    Committee/Subcommittee: E28.11

    DOI: 10.1520/STP37423S


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