Journal Published Online: 01 March 1993
Volume 21, Issue 2

Minimization and Quantification of Error Associated with the Gradient and the Interval of Crack Length Measurement in Fatigue Crack Growth Testing

CODEN: JTEVAB

Abstract

Analytical method has been developed to minimize and quantify the effect of crack length measurement interval Δa on the error due to the K gradient in the interpretation of da dN derived from crack growth test data using the secant method. The associated error has been quantified in a general form and used to demonstrate the specific errors due to the selection of average crack length a per ASTM E 647-91. Test Method for Measurements of Fatigue Crack Growth Rates. It is shown that the selection of the geometric mean (a¯=a1a2) in the data analysis will reduce the associated error in the crack growth rate interpretation. It is recommended that ASTM E 647-91 be revised accordingly.

Author Information

Oore, M
IMP AEROSPACE, Halifax, Nova Scotia, Canada
Pages: 7
Price: $25.00
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Details
Stock #: JTE11752J
ISSN: 0090-3973
DOI: 10.1520/JTE11752J