STP1220

    Shear Fatigue Crack Growth in Large Grain Polycrystals

    Published: Jan 1995


      Format Pages Price  
    PDF Version (448K) 17 $25   ADD TO CART
    Complete Source PDF (14M) 17 $143   ADD TO CART


    Abstract

    Fatigue cracks are often nucleated as small shear cracks. The propagation of such a crack often results in a crack plane that is inclined to the loading axis in such a manner to induce a mixed Mode I, Mode II, and Mode III crack-tip field. In this study, crack growth rates of Mode II and Mode III shear cracks as well as Mode I cracks in large-grain Al 7029 aluminum alloy were measured. The crack-tip resolved shear stress intensity factor, KRSS, was defined and calculated for each slip system in a crystal. The result of the study shows that KRSS is capable of characterizing the shear decohesion mechanism of crack growth, explaining the morphological features of a crack surface, and correlating with shear crack growth rate.

    Keywords:

    shear fatigue crack, mixed-mode crack, fatigue crack growth, resolved shear stress, crystals


    Author Information:

    Chen, Q
    Solid State Science and Technology, Syracuse University, Syracuse, NY

    Liu, HW
    Solid State Science and Technology, Syracuse University, Syracuse, NY


    Paper ID: STP14610S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP14610S


    CrossRef ASTM International is a member of CrossRef.