Abstract
The cryogenic temperature near-threshold fatigue crack growth behavior of several structural materials: aluminum alloys, copper, steels, nickel alloys and titanium alloys, was reviewed. It was observed that the resistance to near-threshold fatigue crack propagation in the alloy systems investigated generally improved with decreasing temperature. Environmental effects were not responsible for the influence of temperature on near-threshold crack growth rate behavior. Furthermore, crack closure alone could not account for this temperature effect. The dislocation dynamics model appears to offer a possible rationale to explain the improved near-threshold crack growth performance typically exhibited at cryogenic temperatures by the variety of materials examined herein. Crack closure, on the other hand, rationalized the influence of load ratio on low temperature near-threshold crack propagation behavior.
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