title: Numerical simulation of the fatigue behavior of additive manufactured titanium porous lattice structures.
abstract: In this paper, the effects of cell geometry and relative density on the high-cycle fatigue behavior of Titanium scaffolds produced by selective laser melting and electron beam melting techniques were numerically investigated by finite element analysis. The regular titanium lattice samples with three different unit cell geometries, namely, diamond, rhombic dodecahedron and truncated cuboctahedron, and the relative density range of 0.1-0.3 were analyzed under uniaxial cyclic compressive loading. A failure event based algorithm was employed to simulate fatigue failure in the cellular material. Stress-life approach was used to model fatigue failure of both bulk (struts) and cellular material. The predicted fatigue life and the damage pattern of all three structures were found to be in good agreement with the experimental fatigue investigations published in the literature. The results also showed that the relationship between fatigue strength and cycles to failure obeyed the power law. The coefficient of power function was shown to depend on relative density, geometry and fatigue properties of the bulk material while the exponent was only dependent on the fatigue behavior of the bulk material. The results also indicated the failure surface at an angle of 45° to the loading direction.
authors.affiliation: Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Zargarian
authors.affiliation: Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Esfahanian
authors.affiliation: Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran; Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), University of Stuttgart, Stuttgart, Germany. Electronic address: j.kad@srttu.edu.
authors.forename: J
authors.initials: J
authors.lastname: Kadkhodapour
authors.affiliation: Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Ziaei-Rad
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D020342:Finite Element Analysis; D008422:Materials Testing; D016062:Porosity; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D014025:Titanium
keywords: Additive manufacturing; Cellular solids; Fatigue; Finite element; Ti6Al4V ELI