STP1207

    Resistance Curve Analysis of Surface Cracks

    Published: Jan 1994


      Format Pages Price  
    PDF (500K) 21 $25   ADD TO CART
    Complete Source PDF (16M) 21 $219   ADD TO CART


    Abstract

    In this work, elastic-plastic fracture mechanics (EPFM) methods are extended to study the behavior of surface cracks. The material used is a tungsten inert gas (TIG) welded 2219-aluminum alloy, welded with 2319 weld wire. Calibration and a crack-growth test were performed. A multiple specimen R-curve technique was used. A group of specimens with the same initial crack geometry was tested to different deformation values. Several different groups were considered. Crack extension as a function of position along the crack front was determined and digitized into data files. A method to estimate values of the J integral as a function of position is presented. Local resistance curves were obtained. A parameter to characterize constraint is proposed. It is only based on the elastic solution for G. It is shown that the slopes of the resistance curves are uniquely related to the constraint parameter for all cases considered.

    Keywords:

    materials, elastic, plastic, fracture, mechanics, surface, cracks, J, resistance, curves


    Author Information:

    Ernst, HA
    Professor and graduate research assistant, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    Rush, PJ
    Professor and graduate research assistant, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    McCabe, DE
    Senior engineer, Oak Ridge National Laboratory, Oak Ridge, TN


    Paper ID: STP13717S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP13717S


    CrossRef ASTM International is a member of CrossRef.