TC10 - Lecture 8
Environmentally-assisted fatigue crack growth in gaseous atmospheres
Although the magnitude of the fatigue crack growth enhancement induced by the gaseous atmosphere in which the material is stressed, including ambient air, is sometimes much greater than that generated by other influencing factors, force is to note that these effects are generally if not completely ignored, at least taken into account in a largely empirical way in the fatigue crack propagation models. This talk provides phenomenological illustrations of these effects, but also discusses the mechanisms proposed. An emphasis is also placed on methodological approaches aimed at isolating these environmental effects, in particular by going back to intrinsic resistance in an inert environment. Some extensions to the case of fatigue crack growth under high pressure gaseous hydrogen gas are also presented.