Quasi-static compression and compression-compression fatigue behavior of regular and irregular cellular biomaterials

摘要

The main aim of the current study is to evaluate the compressive quasi-static and fatigue properties of titanium alloy (Ti6Al4V) cellular materials, with different topologies, manufactured via laser powder bed fusion (LPBF) process. The topologies herein considered are lattice-based regular and irregular configurations of cubic, star, and cross-shaped unit cell along with trabecular-based topology. The results have indicated that the effective stiffness of all configurations are in the range of 0.3-20 GPa, which is desirable for implant applications. The morphological irregularities in the structures induce bending-dominated behavior affecting more the topologies with vertical struts. The S-N curves normalized with respect to the yield stress indicate that the behavior of star regular structures is between purely stretching-dominated cubic and purely bending-dominated cross-based structures. Trabecular structures have shown desirable quasi-static and fatigue properties despite the random distribution of struts.