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A microcomputer control system for the measurement of fatigue crack growth data

✍ Scribed by K.R. Abbott; P. Doig

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 899 KB
Volume: 23
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(86)90140-2

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✦ Synopsis

A microcomputer-based system for the measurement of fatigue crack growth dnldn versus cyclic stress intensity factor AK data using compact-tension test specimens is described. The procedure has been developed to allow automatic measurement of crack growth rate under any specified combination and sequence of load conditions, i.e. AK and R (stress ratio) and includes the capability of establishing the threshold cyclic stress intensity factor A Ko. Crack extension measurement is effected from the elastic compliance evaluated from the AC component of the load and displacement signals to an accuracy of =3 +rn every 1000 load cycles. Results from a typical low-alloy-steel rotor forging are presented to illustrate the use of the system.

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