MULTIAXIAL MECHANICAL PROPERTIES OF ADDITIVE MANUFACTURED TITANIUM GYROID

Advances in additive manufacturing permit the fabrication of parts with great geometric complexity and relatively small dimensions, and allow the creation of topologies that are not possible by using conventional manufacturing techniques. Due to the excellent biocompatibility of titanium metal, the high stiffness ratio as well as the good energy absorption of porous structures, additively manufactured porous titanium has a promising future in the medical field. The established method of gyroid finite element modeling and various types of parameter settings are introduced first, after which Ls-Dyna is adopted as the finite element calculation tool. The mechanical behaviors of additively manufactured porous titanium under multiaxial compressive stress state are investigated by changing the boundary conditions of the 3D fine view finite element model. The multiaxial large deformation compression process of three volume fraction porous titanium specimens is performed by laterally coupling two boundary conditions, that is, the uniaxial compression and the hydrostatic compression. The initial platform stress, the true stress with the logarithmic strain curve, the plastic Poisson's ratio with the axial strain, and the Cauchy's stress-volume strain curve of porous titanium specimens under each stress state are obtained. The above numerical results give some guidance for the study of the triaxial covariance ontological relationship of porous titanium.