STP877

    An Automated Fatigue Crack Growth Rate Test System

    Published: Jan 1985


      Format Pages Price  
    PDF Version (176K) 11 $25   ADD TO CART
    Complete Source PDF (4.5M) 11 $55   ADD TO CART


    Abstract

    An automated fatigue crack growth rate (FCGR) test system has been developed that can be used for tests of constant-load-amplitude FCGR above 10−8 m/cycle [ASTM Test Method for Constant-Load-Amplitude Fatigue Crack Growth Rates Above 10−8 m/Cycle (E 647-83)] at normal (∼ 10 Hz) or low (∼ 0.1 Hz) cyclic frequencies and for tests of near-threshold and variable-load-amplitude FCGR. The test system consists of a minicomputer, a programmable arbitrary waveform generator, a servo-hydraulic test frame, and a programmable digital oscilloscope. The crack length is measured using the compliance technique; the FCGR and the stress-intensity factor range are calculated and plotted automatically during the test.

    Keywords:

    automated test system, compliance technique, fatigue crack growth rate, fatigue of materials, near-threshold fatigue test, variable-load-amplitude fatigue test


    Author Information:

    Cheng, Y-W
    Metallurgist and physicist, Fracture and Deformation Division, National Bureau of Standards, Boulder, CO

    Read, DT
    Metallurgist and physicist, Fracture and Deformation Division, National Bureau of Standards, Boulder, CO


    Paper ID: STP32889S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP32889S


    CrossRef ASTM International is a member of CrossRef.