corrosion fatigue

Corrosion fatigue is a problem encountered in many aggressive environments.

Thus, it is more useful to evaluate crack-propagation behavior during corrosion fatigue.

The only requirement for corrosion fatigue is that the sample be under tensile stress.

Corrosion fatigue in aqueous media is an electrochemical behavior.

However,their usefulness depends to a large extent on the extent to which they resist corrosion fatigue.

Corrosion fatigue is fatigue in a corrosive environment.

For this reason, emphasis is given to crack-propagation velocity measurements (using fracture mechanics) to study corrosion fatigue.

Corrosion fatigue is what happens when a cyclically stressed structure is subjected to a corrosive environment at the same time.

Corrosion fatigue may be reduced by alloy additions, inhibition and cathodic protection, all of which reduce pitting.

However, in corrosion fatigue crack nucleation is facilitated by corrosion; typically, about 10 percent of life is sufficient for this stage.

The NTSB investigation synopsis pointed to corrosion fatigue as the underlying cause of the catastrophic breach.

Additionally, UIT has proven effective in addressing stress corrosion cracking, corrosion fatigue and related issues.

The diagram on the left is a schematic of crack-growth rate under true corrosion fatigue; the curve shifts to a lower stress-intensity-factor range in the corrosive environment.

In true corrosion fatigue, the fatigue-crack-growth rate is enhanced by corrosion; this effect is seen in all three regions of the fatigue-crack growth-rate diagram.

Metals and alloys exhibit phenomena such as stress corrosion cracking, hydrogen embrittlement, liquid metal embrittlement and corrosion fatigue all coming under this category.

When attempting to analyze the effects of corrosion fatigue on crack growth in a particular, both corrosion type and fatigue load levels affect crack growth in varying degrees.

Uhlig's research interests were broad and included the study of passivation of transition metals, pitting and stress corrosion, hydrogen embrittlement, metal surface properties, corrosion fatigue, and corrosion-resistant alloys.

Comparison of the Improvement in Corrosion Fatigue Strength of Weld Repaired Marine Cu 3-grade Bronze Propellers by Ultrasonic Impact Treatment (UIT) or Heat Treatment.

Improvements in HCF, corrosion fatigue and SCC are documented, with fatigue strength enhancement attributed to improved finish, the development of a compressive surface layer, and the increased yield strength of the cold worked surface.

The LPB process includes a unique and patented way of analyzing, designing, and testing metallic components in order to develop the unique metal treatment necessary to improve performance and reduce metal fatigue, SCC, and corrosion fatigue failures.

Jayaraman, N., Prevey, P. "Case Studies of Mitigation of FOD, Fretting Fatigue, Corrosion Fatigue and SCC Damage by Low Plasticity Burnishing in Aircraft Structural Alloys."

Crack propagation under corrosion fatigue may be classified as a) true corrosion fatigue, b) stress corrosion fatigue or c) a combination of true, stress and corrosion fatigue.