protection-of-dynamic-fatigue-by-surface-hardeningThe hardening of a surface is an important protectionagainst unallowable decreases in dynamic fatiguestrength caused by surface damage. Standardized vibration-resistant stress amplitudeShot peenedCold rolledReference values* for acceptable scratch depths [mm] in surfaces with different treatments.*no guarantee!1.2 1.10.90.80.71The dynamic fatiguestrength of a disk madefrom a titanium alloy, over a specified life span with an estimatedabsolute scratch depth0.050.10.2Chipping-machinedScratch depthZone with compressiveresidual stress