STP995V1

    An Advanced Procedure for J-R Curve Testing Using a Drop Tower

    Published: Jan 1988


      Format Pages Price  
    PDF Version (248K) 20 $25   ADD TO CART
    Complete Source PDF (9.5M) 20 $140   ADD TO CART


    Abstract

    An improved method to obtain J-R curves from drop-tower fracture mechanics specimens is described in detail. New features include aluminum absorbers to smooth the load versus time record, a double-capacitance gage to locate the crack initiation point, and an analytic key curve to obtain the J-R curve from a test on a single full-size fracture mechanics specimen. The absorbers are shown to slow the initial loading rate but not to affect the displacement rate near crack initiation or during the ductile tearing portion of the drop test.

    Drop-tower J-R curves are obtained for a 3% nickel structural steel and compared with static results and results obtained by earlier test methods.

    Keywords:

    J-R, curves, dynamic fracture, ductile fracture, elastic-plastic fracture, crack propagation, J, -integral fracture mechanics, drop-tower testing, fracture mechanics, nonlinear fracture mechanics


    Author Information:

    Joyce, JA
    Professor of Mechanical Engineering, U.S.,

    Hackett, EM
    Research engineer, David Taylor Naval,


    Paper ID: STP26781S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP26781S


    CrossRef ASTM International is a member of CrossRef.