Crack Propagation in Notched Mild Steel Plates Subjected to Cyclic Inelastic Strains

    Published: Jan 1971

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    Mild steel (SAE 1015) plate specimens with central circular holes were used to study crack propagation in the inelastic strain region. These thin plates were subjected to completely reversed constant amplitude cyclic strains in a servocontrolled testing machine. Fatigue crack propagation results in the inelastic strain region showed that the rate of crack growth is a polynomial function of the equivalent stress intensity factor developed in this work. The relation is similar to the equation proposed by Paris and Erdogan for an elastic case and describes crack propagation rates for both elastic and inelastic strain levels. The equivalent (or modified) stress intensity factor indirectly represents actual crack tip stresses and strains and reduces to the elastic stress intensity factor. With the aid of the results of the present study, other methods proposed by various investigators for predicting crack propagation rates are also discussed.


    fatigue (materials), stresses, strains, fracture properties, crack propagation, stress intensity factor, cracks, steels

    Author Information:

    Gowda, CVB
    Assistant professor and professor, University of Waterloo, Waterloo, Ontario

    Topper, TH
    Assistant professor and professor, University of Waterloo, Waterloo, Ontario

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP38030S

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