STP527

    R-Curve Determination Using a Crack-Line-Wedge-Loaded (CLWL) Specimen

    Published: Jan 1973


      Format Pages Price  
    PDF Version (408K) 19 $25   ADD TO CART
    Complete Source PDF (2.1M) 19 $55   ADD TO CART


    Abstract

    A procedure is described for determining crack-growth-resistance curves, R-curves, using crack-line-wedge-loaded (CLWL) specimens. In testing high-strength sheets, a compliance procedure has been used to determine the applied load, and the effective crack length is taken as the visible crack length plus the Irwin plastic zone correction. For lower strength, higher toughness sheets and light plates, the effective crack length is determined by a double compliance technique. For these materials the ry = 1/2π × (KYS)2 plastic zone radius was found to overcorrect the crack length.

    Currently a plastic hinge model is being investigated as a means of extending R-curve determinations well into the plastic deformation range.

    A comparison of R-curves determined by CLWL specimens and by center-cracked tension specimens of high-strength sheets shows quite good agreement. There is little information of this type on the tougher materials. Present work is directed at R-curve determinations on low-alloy, high-toughness light-plate material.

    Keywords:

    crack propagation, fracture toughness, aluminum alloys, structural steels, loads (forces), strains, stresses, stainless steels, measurement, tests, evaluation, fracture strength


    Author Information:

    McCabe, DE
    Senior research metallurgist and principal research associate, Research and Technology Center, Armco Steel Corp., Middletown, Ohio

    Heyer, RH
    Senior research metallurgist and principal research associate, Research and Technology Center, Armco Steel Corp., Middletown, Ohio


    Paper ID: STP34705S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP34705S


    CrossRef ASTM International is a member of CrossRef.