Characterization of the deformation behavior of intermediate porosity interconnected Ti foams using micro-computed tomography and direct finite element modeling

摘要: Under load-bearing conditions metal-based foam scaffolds are currently the preferred choice as bone/cartilage implants. In this study X-ray micro-computed tomography was used to discretize three-dimensional structure of a commercial titanium in spinal fusion devices. Direct finite element modeling, continuum micromechanics and analytical models were employed characterize elasto-plastic deformation behavior. These results validated against experimental measurements, including ultrasound monotonic interrupted compression testing. Interrupted tests demonstrated localized collapse pores unfavorably oriented with respect loading direction at many isolated locations, unlike Ashby model, which row by row. A principal component analysis technique developed quantify pore anisotropy then related yield stress anisotropy, indicating will first. The Gibson-Ashby model extended incorporate considering an orthorhombic, rather than tetragonal, unit cell. It is worth noting that natural bone highly anisotropic there need develop implants mimic characteristics.