operating-influenced-by-surface-damagesBurrs (e.g. from finishing or assembly) Roughness due to machining (e.g. turninggrooves, grinding grooves)Cracks (e.g. comma cracks) Notches (e.g. FOD, assembly damage) Structural changes (e.g. re-solidified, hardened,annealed, coagulated, solution annealed)Reactions and diffusion (e.g. oxidation, depletion)Fused molten particles (e.g. welding splash)Residual stress conditions (e.g. high residualstresses have a negative effect on operating strength)Corrosion scars (e.g. pitting)Cracking due to corrosion (e.g. intergranular corrosion)Foreign particles (e.g. blasting media, erosion particles,grinding grit)Smeared foreign material (e.g. from the finishingprocess, from assembly tools, FOD)Strain hardening (e.g. shot peening, FOD)Embrittled surface zones (e.g. diffusion zones)Friction oxidation (fretting)Surfaces can have a large variety of damages and changes that can decisively influence the operatingbehavior of the parts.Plastic deformations (e.g. due to external forces)ca 1 mm