STP536

    Effect of a Loading Sequence on Threshold Stress Intensity Determination

    Published: Jan 1973


      Format Pages Price  
    PDF (180K) 11 $25   ADD TO CART
    Complete Source PDF (7.0M) 11 $125   ADD TO CART


    Abstract

    The effect of a loading sequence on the stress corrosion cracking of AISI 4340 steel and Ladish D6AC steel in an aqueous environment has been studied with double-cantilever beam specimens. The loading sequence was found to influence an incubation time period for the initiation of crack propagation as the stress intensity (K) changed. When the stress intensity was decreased during stress-corrosion testing, the incubation time was dependent upon the change in stress intensity and the final stress intensity (Kf). When the stress intensity was increased, an incubation time was not found. However, the loading sequence did not influence the steady-state crack growth rates. The loading sequence effect is shown to cause interpretation problems when specific time periods are used for the determination of the threshold stress intensity (KIscc), especially after the specimens have been prestressed.

    Keywords:

    fracture properties, mechanical properties, crack propagation, loads(forces), sequencing, stress corrosion tests, stresses, evaluation


    Author Information:

    Harrigan, W. C.
    Members of the Technical Staff, The Aerospace Corporation, Los Angeles, Calif.

    Dull, D. L.
    Members of the Technical Staff, The Aerospace Corporation, Los Angeles, Calif.

    Raymond, L.
    Members of the Technical Staff, The Aerospace Corporation, Los Angeles, Calif.


    Paper ID: STP49641S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP49641S


    CrossRef ASTM International is a member of CrossRef.