Lightweight

high-strength

and energy-absorbing lattice structures with integrated advantages have been paied significant attention for their mechanical properties. However

due to the complexity of the structures

to predict accurately their fatigue life remains challenging. Inspired by the geometric configurations of BCC and SC unit cells

an SC-BCC unit cell is designed

and expanded them periodically

and three flexible lattice structures by using DLP processing are fabricated. Fatigue property parameters were obtained by grouping method under strain level

and fatigue strength of lattice structure was predicted with numerical simulation. The reliability of the numerical simulation results was verified by constructing the S-N curves and discrete data obtained from low-cycle fatigue tests. The results showed that the S-N curves obtained from numerical simulations and experiments were highly consistent with the power-law relationship. Under the same relative density

the absolute fatigue strength largely depended on the unit cell configuration

while the difference in normalized fatigue strength was not significant.