SYMPOSIA PAPER Published: 01 January 1985
STP32889S

An Automated Fatigue Crack Growth Rate Test System

Source

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.

Author Information

Cheng, Y-W
Fracture and Deformation Division, National Bureau of Standards, Boulder, CO
Read, DT
Fracture and Deformation Division, National Bureau of Standards, Boulder, CO
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Details
Developed by Committee: E08
Pages: 213–223
DOI: 10.1520/STP32889S
ISBN-EB: 978-0-8031-4942-7
ISBN-13: 978-0-8031-0421-1