Energy absorption properties of macro triclinic lattice structures with twin boundaries inspired by microstructure of feldspar twinning crystals

Inspired by the microstructure of the triclinic crystal material, in this work we designed triclinic lattice structures (TC) with twin boundaries for energy absorption application. The deformation mode and energy absorption capacity of TCs under the quasi-static compression are investigated by finite element method, which is validated by the experiments on the TC specimen additively manufactured by the selective laser sintering (SLS) method. The TC design is further extended to the triclinic body-centered cubic lattice structures (TBCC). The results indicate that introducing twin boundaries into the lattice structure can control the deformation mode and thus improve the energy absorption performance. The energy absorption increases with the number of twin boundaries in both TCs and TBCCs. In addition, the plateau stress and the equivalent grain size of the proposed structures are found to also obey the Hall-Petch relationship that is prevalent in the polycrystal materials. This work verifies the feasibility of the approach of designing novel lattice structures by mimicking the material microstructures.