A Crack Detection Technique for Use With Brittle Materials

[+] Author and Article Information
W. S. Sampath

Colorado State University, Ft. Collins, CO

T. C. Ramaraj, M. C. Shaw

Arizona State University, Tempe, AZ

J. Eng. Ind 108(3), 232-235 (Aug 01, 1986) (4 pages) doi:10.1115/1.3187070 History: Received April 22, 1986; Online July 30, 2009


Crack gages are sensors designed to monitor crack initiation and growth in engineering structures by alteration of electrical conductance. Present gages involve a thick (5 μm) metal foil on an even thicker polymer substrate and are not suitable for use on brittle materials where the crack opening is small. The new technique employs a very thin (300 Å) gold film sputtered on a nonconducting brittle specimen. The method also enables crack propagation velocity to be estimated.

Copyright © 1986 by ASME
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