SYMPOSIA PAPER Published: 01 January 1978
STP26546S

Effect of Specimen Width on Fracture Toughness of Ti-6A1-4V Plate

Source

From a group of 96 specimens ranging in thickness from 15 to 38 mm (0.60 to 1.50 in.), a regression equation was obtained for Ti-6A1-4V plate relating the fracture toughness, KQ, of 205-mm (8-in.) wide specimens to the variables of specimen thickness and fracture toughness, KQ, for 76-mm (3-in.) width. The fracture toughness value of Ti-6A1-4V plate can be increased appreciably in thin specimens by using an oversized width specimen. The magnitude of this toughness increase diminishes as the thickness increases and approaches 38-mm (1.5-in.). Oversizing the specimen results in a significant reduction in the stress at instability at 2 percent crack extension. The specimen strength ratio, Rsc, essentially remains the same while Kmax and the Pmax/PQ ratio increase.

Crack-growth-resistance curves constructed from load versus crack-opening-displacement curves for the two different width specimens are similar. This indicates the fracture behavior is the same and not altered with increased specimen width. Furthermore, K values for oversized specimens can be calculated from the loads at the appropriate crack extension in smaller standard size specimens, and vice versa.

Author Information

Hall, GS
RMI Company, Niles, Ohio
Seagle, SR
RMI Company, Niles, Ohio
Bomberger, HB
RMI Company, Niles, Ohio
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Details
Developed by Committee: E08
Pages: 227–245
DOI: 10.1520/STP26546S
ISBN-EB: 978-0-8031-4721-8
ISBN-13: 978-0-8031-0591-1