Smooth Surface Possessing Fatigue Strength

Prof. Dr. Mattheck, Dr. Herrmann, Dr. Seidel


The surface possessing fatigue strength has a smooth, convex surface from which protrude regularly shaped protuberances. The sides of each protuberance form a four sided pyramid plane at right angles to the surface and containing all the surface normals of the side surface. The side surface forms an intersecting line. The protuberances have a square base surface and are positioned in a draught board formation. These are grooves in the pyramids and the curved surfaces at the bases of the pyramids fulfill a given mathematical relationship.

USE/ADVANTAGE – Possible notch stresses on the surface are minimised and the surface joined to the material.