Mechanical responses of Ti-6Al-4V truss lattices having a combined simple-cubic and body-centered-cubic (SC-BCC) topology

Abstract In this work, a combined simple-cubic (SC) and body-centered-cubic (BCC) topology, i.e., SC-BCC, was adopted to make cellular truss lattice structures out of Ti-6Al-4V alloy via a snap-fit methodology followed by vacuum brazing to metallurgically bond the joints. Lattice structures of 3.6% to 17.1% relative densities were fabricated and mechanically tested in compression. A rule of mixture model was employed to analyze the snap-fit SC-BCC-truss structures' mechanical responses. Both experimental and finite element results, with the edge effect taken into account, were compared to the analytical predictions, and good agreements were found between each other. The fabricated titanium alloy SC-BCC-truss structures exhibited comparable compressive responses to the octet-truss structures and can serve as a potential candidate for high temperature lightweight load bearing applications.