Abstract
A direct mathematical method to determine the important geometrical parameters relative to surface roughness has been discussed. The surface-roughness characteristics that were produced on low-cycle fatigue specimens of Type 304 stainless steel by a silicon carbide grinding technique have been evaluated. An attempt has been made to establish a correlation between the shape and depth of the surface grooves and the fatigue crack-initiation life determination from fatigue specimens with well-characterized surface roughness. This analysis has been extended to existing measurements of the surface topography developed in initially smooth specimens of aluminum subjected to torsional fatigue. The quantitative description of the kinetics of such surface topographical changes is expected to yield valuable information pertinent to the crack-initiation process.
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