Abstract
The influence of orientation on octet-truss lattice static properties has been extensively studied. Fatigue failure is one of the main forms of structural failure of lattices. The fatigue properties of lattice structures, such as crack growth direction and crack growth rate, depend on orientation. Hence, it is important to explore the orientation effects on octet-truss lattice fatigue. Differently oriented octet-truss lattices in this research were additively manufactured into compact tension specimen geometry using photopolymer. From the experiment, the fatigue crack paths for differently oriented lattices were observed and compared with each other. The compliance method described in ASTM E647 was used to calculate the fatigue crack growth rates of lattices in different orientations. It is found from experiment that orientation-ZX lattices have the greatest resistance to fatigue crack propagation. Analytical formulae to predict the lattice fatigue life in different orientations were derived by simplifying individual lattice struts as pin-jointed bars. These findings can help us understand the orientation dependence of lattice fatigue failure.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
