Abstract
In order to investigate effects of frequency ratio on fatigue crack growth behavior in a gas-pressure sintered silicon nitride, fatigue crack growth tests under two kinds of repeated two-step loading were carried out using compact tension specimens. Fatigue crack growth rate and macroscopic crack closure were measured by means of the unloading elastic compliance method. Crack growth rate at low level loading, (da/dn)L, was found to be accelerated in comparison with that under constant amplitude loading having same ΔK value. Effect of frequency ratio on crack growth behavior under repeated two-step loading holding K_<min> constant is remarkable, but under repeated two-step loading holding K_<max> constant is small.
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