Detection of 1 mm Fatigue Crack Initiation Using Strain Waveform

[+] Author and Article Information
Chobin Makabe, Hideo Kaneshiro

Mechanical Engineering Department, University of the Ryukyus, Okinawa, Japan

Shin-ichi Nishida

Mechanical Engineering Department, Saga University, Saga, Japan

Chikayuki Urashima

Yawata R&D Laboratory, Nippon Steel Corp., Kita-kyushu, Japan

J. Eng. Mater. Technol 116(4), 483-487 (Oct 01, 1994) (5 pages) doi:10.1115/1.2904317 History: Received August 06, 1993; Revised December 07, 1993; Online April 29, 2008


It is very difficult to monitor fatigue crack initiation at all parts of machine equipment day after day. In this study, a method of continuous monitoring for fatigue crack initiation is examined which uses the strain waveform of running machine. A notched section of the equipment is taken as the inspection point because many fracture accidents originate in fatigue cracks initiated from such a notch. Fatigue crack initiation can easily be detected by observation of the waveform of a strain function composed of the strains in the vicinity of the notch, because it changes shape on crack initiation. This change of the waveform is brought about by the change of the compliance of the material due to the crack closure behavior. It is found that crack initiation detection is improved by spectral analysis of the waveform.

Copyright © 1994 by The American Society of Mechanical Engineers
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