Fracture of Defects Approaching a Free Surface

[+] Author and Article Information
W. G. Gibbons

Gas Turbine Products Division, General Electric, Schenectady, N. Y.

W. R. Andrews

Materials and Process Laboratory, General Electric, Schenectady, N. Y.

G. A. Clarke

Large Steam Turbine and Generator Dept., General Electric, Schenectady, N. Y.

J. Pressure Vessel Technol 97(4), 270-277 (Nov 01, 1975) (8 pages) doi:10.1115/1.3454307 History: Received March 26, 1975; Online October 25, 2010


A testing program has been run using off-centered-cracked (OCC) plate specimens to demonstrate the fracture characteristics of tunnel defects in specimens with various ligament lengths between the near surface crack tip and a free surface. Measured strain values and the fracture results compared favorably with theory up to the limits of the analyses. An empirical equation which calculates the near surface stress intensity provides extended calculational capabilities. In addition, fatigue crack growth and fracture velocities plus fracture toughness were measured for a Cr-Mo-V steel.

Copyright © 1975 by ASME
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