Crack Guidance Utilizing the Orientation of Additive Manufactured Lattice Structure

Abstract

We propose a method to guide the direction of cracks by utilizing the orientation of Ti-6Al-4V lattice structures produced by powder bed fusion, which has recently attracted considerable attention in additive manufacturing. The fracture characteristics and impact strengths were observed by inserting a diagonal structure with structural anisotropy into specimens of various directions and densities, and it was confirmed that the impact strength differed depending on the differences between the direction of the z-strut, impact direction, and density of the lattice structure. Using this, crack guidance specimens with optimal lattice structures were manufactured along the direction of the cracks, and it was confirmed that cracks were uniformly induced in comparison to single lattice crack guidance specimens. This crack guidance is expected to be used in future machinery in various industries for the protection of important components and shock mitigation in the event of a sudden impact.