Strain-gage methods for measuring the opening-mode stress-intensity factor,K I |
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Authors: | J. W. Dally R. J. Sanford |
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Affiliation: | (1) Department of Mechanical Engineering, University of Maryland, 20742 College Park, MD |
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Abstract: | Measurements of strain near a crak tip with electrical-resistance strain gages do not usually provide a reliable measure ofK I because of local yielding, three-dimensional effects and limited regions for strain-gage placement. This paper develops expressions for the strains in a valid region removed from the crack tip, and indicates procedures for locating and orienting the gages to accurately determineK I from one or more strain-gage readings. |
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