Journal Published Online: 01 November 1990
Volume 18, Issue 6

Imaging Short Fatigue Cracks with the Gel Electrode



A new non-destructive inspection tool is described for tracking and recording crack growth in test coupons and structural components. The current state of development of this device, the gel electrode, is reviewed. This hand-held inspection probe can image surface fatigue cracks in iron, titanium, magnesium, and aluminum alloys. Fatigue cracks only ∼10−2 mm long can be detected, a sensitivity which surpasses that of commercially available techniques by a factor of 100. Images of short fatigue cracks are shown for each of the above alloy systems. The examples are selected to illustrate the good visibility and repeatability of the images, as is required to monitor crack growth. Included are quantitative measurements of the growth kinetics of a short (10−1 to 1 mm) crack in a prototype component.

Author Information

Baxter, WJ
General Motors Research Laboratories, Warren, MI
Pages: 9
Price: $25.00
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Stock #: JTE12512J
ISSN: 0090-3973
DOI: 10.1520/JTE12512J