Fatigue prediction and life assessment method for metal laser powder bed fusion parts
Wessel W. Wits, Emiel Amsterdam
Abstract
In this paper, an industry-accepted fatigue model based on generalized stress-life (S–N) curves is adapted for metal parts fabricated by laser powder bed fusion (LPBF). Initial defects inherent to the fabrication process, such as part porosity, are related to fatigue life performance. Hereto, additively manufactured test specimens are fatigue tested and used to formulate a function to predict fatigue life based on the size of initial defects. The predictions correlate well with experimental results and provide a quality measure to expel outliers. The method can be used to predict the life expectancy of LPBF parts based on a priori detected defect sizes.
Topics & Concepts
Materials scienceFusionPorosityOverlayFabricationA priori and a posterioriLife expectancyProcess (computing)Structural engineeringComposite materialComputer scienceEngineeringEpistemologyDemographyProgramming languageAlternative medicineLinguisticsPathologySociologyPhilosophyMedicineOperating systemPopulationAdditive Manufacturing Materials and ProcessesAdditive Manufacturing and 3D Printing TechnologiesWelding Techniques and Residual Stresses