Journal Published Online: 01 June 2006
Volume 35, Issue 1

Influence of the Calibration Points on the Parameter Behavior



The present work studies the separability parameter Spb behavior to estimate crack lengths when two or three calibration points are used. A set of precracked and blunt notched specimens with three-point bend ASTM-SE(B) geometry were prepared from three materials: AA 6061-T6 aluminum alloy with different side groove ratio, high-strength low-alloy welded steel, and 2.25Cr-1Mo steel. For each precracked specimen, initial and final crack length were measured on the crack surface. Intermediate crack lengths were determined by two methodologies: the standard elastic unloading and the Spb parameter method using two and three calibration points. The Spb crack lengths were very close to those estimated using the standard methodology; differences between them were less than 15 % Δa, suggested as a difference limit value in ASTM E 1820-99 to alternative methods for measuring crack extension. The performance of Spb parameter was evaluated using two and three calibration points. J-R curves were constructed. The JIQ values obtained by the standard methodology and the Spb method were similar.

Author Information

Wainstein, JE
Facultad de Ingenitería, Universidad Nacional del Comahue, Neuquen Capital
Cocco, RG
Facultad de Ingeniería, Universidad Nacional de Mar del Plata, Mar del Plata
de Vedia, LA
Instituto de Technología Jorge A. Sábato (UNSAM-CNEA), CIC, Buenos Aires, Argentina
Cassanelli, AN
Instituto de Technología Jorge A. Sábato (UNSAM-CNEA), CIC, Buenos Aires, Argentina
Pages: 9
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Stock #: JTE100131
ISSN: 0090-3973
DOI: 10.1520/JTE100131