Development of fatigue crack closure mechanism maps - Part 2 - Construction of maps for various materials

Crack closure mechanism maps are constructed for a variety of ferrous and n on-ferrous alloys using the boundary equations derived in Part 1. Extensive fatigue crack growth studies involving crack closure measurements and frac tography were performed to validate the predictions of the crack closure me chanism maps developed in this way. It is demonstrated that the dominance o f a particular mechanism under a given set of loading conditions is depende nt on the deformation behaviour; controlling microstructure unit, yield str ength, texture, and component thickness. Finally, some possible engineering applications of crack closure mechanism maps are suggested.