K Calibration for 'C' Shaped Fracture Toughness Specimens of Various Geometries.
WATERVLIET ARSENAL N Y
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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 r sub 2r sub 1, 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, xt, as well as the usual crack depth to specimen thickness ratio, at. 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 xt. Modified author abstract