Low Cycle Fatigue Crack Propagation Characteristics of Monel 400 and Monel K-500 Alloys

摘要

Tests were conducted on Monel 400 and Monel K-500 plate bend fatigue specimens. Rapid crack initiation was achieved by means of a mechanical surface notch, and crack growth rates were monitored under constant-totalstrain-range full-reverse cycling. Test conditions included a variety of strain range values in both air and simulated slat water environments. It was found that low cycle fatigue crack growth rates can be expressed as an exponential function of applied total strain range. Based on this function a method was devised for comparing the low cycle fatigue crack propagation characteristics of a variety of materials. This method takes into account yield strength level, elastic modulus, and the effects of a corrosive environment. (Author)