STP868: Strain-Rate Dependence of the Deformation at the Tip of a Stationary Crack

    Hoff, R
    Graduate Assistant, Associate Professor, and Professor, Vanderbilt University, Nashville, TN

    Assistant Professor, University of Waterloo, Waterloo, Ontario

    Rubin, CA
    Graduate Assistant, Associate Professor, and Professor, Vanderbilt University, Nashville, TN

    Hahn, GT
    Graduate Assistant, Associate Professor, and Professor, Vanderbilt University, Nashville, TN

    Pages: 22    Published: Jan 1985


    Abstract

    A new analytical technique is presented whereby the Hutchinson-Rice-Rosengren singularity solutions can be used, in certain cases, to determine the stresses and strains near a crack tip for a dynamically loaded, strain rate-dependent material. This technique involves a simple modification of the constant, α, and the strain hardening exponent, n, in the power stress-strain law. Elastoplastic, dynamic finite element computations are in close agreement with this analytical technique.

    Stresses and strains are generally higher in a dynamically loaded rate sensitive material than in a rate insensitive material. Also, J1c increases correspond to increases in the flow stress in rate-sensitive materials, provided that δc is rate-insensitive.

    Keywords:

    fracture, cracks, plastic fracture mechanics, dynamic, strain rate, J, -integral, crack opening displacement, finite element models, compact tension specimen, steels, power-law hardening materials


    Paper ID: STP34266S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP34266S


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