SYMPOSIA PAPER Published: 01 January 1974

Calibration for C-Shaped Specimens of Various Geometries


Prior collocation results are combined with new collocation data and analyzed using two parameter data approximation methods and fracture mechanics methods. A general K calibration is obtained for C-shaped specimens which have outer to inner radius ratios, W = r2/r1, between 1.4 and 2.5.

The K calibration for C-shaped specimens is found to depend on the load eccentricity to specimen thickness ratio, x/t, as well as the usual crack depth to specimen thickness ratio, a/t. The K results are presented as tabular and plotted values from a cubic spline surface used to approximate the collocation data and as a polynomial approximation of the collocation data over a more limited range of x/t.

Author Information

Underwood, JH
Benet Weapons Laboratory, Watervliet, N. Y.
Scanlon, RD
Benet Weapons Laboratory, Watervliet, N. Y.
Kendall, DP
Benet Weapons Laboratory, Watervliet, N. Y.
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Developed by Committee: E08
Pages: 81–91
DOI: 10.1520/STP33134S
ISBN-EB: 978-0-8031-4645-7
ISBN-13: 978-0-8031-0361-0