Experimental Determination Technique of Stress Intensity Factor and Its Application

[+] Author and Article Information
Y. Z. Itoh, T. Murakami, H. Kashiwaya

Heavy Apparatus Engineering Laboratory, Toshiba Corporation, Tsurumi-ku, Yokohama, 230 Japan

J. Eng. Mater. Technol 111(1), 81-86 (Jan 01, 1989) (6 pages) doi:10.1115/1.3226437 History: Received December 10, 1987; Online September 15, 2009


The proportional extrapolation technique is proposed for determining experimentally and accurately stress intensity factors, using the crack tip stresses measured by strain gage. The technique is based on the assumption that the effects of gage length and width on the measurement of the crack tip stresses are corrected by comparing with standard problems, and the corrected results are only accurate in the limit as r→0 (r; distance from crack tip). A special strain gage pattern was developed for applying the proportional extrapolation technique. The stress intensity factors of a two-dimensional crack problem were analyzed using this strain gage, and as an application example, the fracture behavior under mixed mode loading was investigated on notched polymer sheets.

Copyright © 1989 by ASME
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