Fatigue Crack Growth in Large Specimens With Various Stress Ratios

[+] Author and Article Information
F. Ellyin

Department of Mechanical Engineering, The University of Alberta, Edmonton, Alberta, Canada

H.-P. Li

Petroleum Machinery Research Institute, Lanzhou, Gansu, People’s Republic of China

J. Pressure Vessel Technol 106(3), 255-260 (Aug 01, 1984) (6 pages) doi:10.1115/1.3264340 History: Received May 23, 1984; Online November 05, 2009


An experimental investigation has been carried out on large plates made of pressure vessel steel A516 Gr.70, to determine the fatigue crack growth rate. The specimen size was 914.4 × 304.8 × 12.7 mm (36 × 12 × 0.5 in.) with an initial central through crack of about 92 mm (3.6 in.). The stress ratio, R , applied to the specimens varied from zero to 0.4. This ratio was maintained constant during a test, but the stress amplitude, Δσ, at times was increased in order to obtain data under a large range of stress intensity factor, ΔK . The crack growth rate, da /dN , is expressed in terms of stress intensities, ΔK and K max , through a power-law-type equation. The variation of material constants with the applied stress ratio is discussed. From the data analysis, a general equation for the crack propagation rate is suggested in the form of da /dN = C (K max )n where C and n are functions of ΔK , K max and material parameters. The results are also compared with the recommended ASME Code formula and are found to be in fairly good agreement.

Copyright © 1984 by ASME
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