STP687: Surface Crack K-Estimates and Fatigue Life Calculations in Cannon Tubes

    Underwood, JH
    Materials engineer and mechanical engineer, U.S. Army Armament Research and Development Command, Benet Weapons Laboratory, LCWSL, Watervliet, N.Y.

    Throop, JF
    Materials engineer and mechanical engineer, U.S. Army Armament Research and Development Command, Benet Weapons Laboratory, LCWSL, Watervliet, N.Y.

    Pages: 16    Published: Jan 1979


    Abstract

    K solutions for internal surface cracks in pressurized cylinders are compared, including Smith's photoelastic results, Hussain's collocation and compliance results, and Underwood's estimates. Fatigue crack growth observations from cannon tubes are described, particularly in relation to surface crack growth and multiple cracks.

    A method is proposed for describing quantitatively the effect of residual stress on K in cylinders with shallow cracks. The combination of compressive residual stress with applied stress reduces ΔK and thus increases fatigue life.

    Keywords:

    fracture mechanics, surface crack, fatigue life, residual stress, pressurized cylinder, crack propagation, fatigue (material)


    Paper ID: STP35040S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP35040S


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