life-span-estimation Base material - Casting, - Forging - Joining Welding, soldering, etc. Surface - Machining - Coating - Hardening, etc. Environmental conditions - Corrosion - Erosion - Foreign objects, etc. Assembly, handling Safely detectable - Flaw size Part being dimensionedExternal forcesConstructive designCollective andtemporal loadprogressionLoads of axialflexure, torsionDetermining thecritical sectionsPartpropertiesNominal stressForm factorCollective nominal stress inthe critical cross-sectionWoehler lineDamage accumulation (e.g. Miner)Estimated life spanInfluence ofmaterial, finishing,and environment(using data from D. Schuetz)Life span estimation procedure and influences that must be taken into consideration:Work processesAsking the manufacturer oroperator of the equipmentUse profileResulting load causesStatistic offrequenciesEnvironmentalinfluencesTemporal progression ofthe loads of the equipmentVibration behaviorof the equipmentTemporal progression of the nominalstress in the critical cross-section of the partCollective nominal stress ExperienceInfluences