Surface roughness effect of SLM and EBM Ti-6Al-4V on multiaxial high cycle fatigue
Theoretical and Applied Fracture Mechanics(2020)
Abstract
•Surface roughness drastically reduce fatigue strength.•High resolution 3D surface measurements allow to model near surface stress field.•Stress gradients induced by surface micro-notches are of hundreds MPa/micron.•A non local fatigue indicator parameter is needed capture gradient effects.•The proposed statistical methodology is able to predict tension and torsion fatigue tests of as built SLM specimens.
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Key words
Additive manufacturing,Ti-6Al-4V,Fatigue,Roughness,Finite element modelling
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