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A study of fatigue crack closure using electric potential and compliance techniques

✍ Scribed by C.K. Clarke; G.C. Cassatt

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
909 KB
Volume
9
Category
Article
ISSN
0013-7944

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✦ Synopsis

The objective of this study was to compare closure data obtained on the same specimen with crack tip compliance gage and electric potential techniques. Equivalent results on closure using the two techniques were obtained on 7075-T651 aluminum center cracked panels. The results also indicated that closure was a function of stress ratio, specimen thickness and maximum applied stress intensity. Maximum stress intensity had a particularly strong effect on closure in the range of applied stresses used. This observed dependence of closure on specimen thickness and maximum stress intensity should account for many of the discrepancies in closure behavior found in the literature. Observations on potential system behavior during closure measurements are also reported.

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