Quasi-static and dynamic mechanical properties of Miura-ori metamaterials: Fid-Bau Portal

Quasi-static and dynamic mechanical properties of Miura-ori metamaterials

Xiang, Xinmei / Qiang, Wei / Hou, Bing / Tran, Phuong / Lu, Guoxing

Abstract In this study, the compression behaviours of Miura-ori nylon metamaterials were experimentally and numerically investigated under quasi-static loading and impact loading. The Miura-ori sheets had four acute angles, $50^{°}$ , $55^{°}$ , $60^{°}$ , and $65^{°}$ , which produced four uniform specimens and nine graded specimens with different stacking orders. All specimens were manufactured by polymer 3D printing. The results showed that for the uniform structures, the specific energy absorption first increased with the acute angle $α$ and then decreased when the angle $α$ continued to increase. All the investigated graded structures considerably enhanced the energy absorption capacity and avoided the force drop after the initial peak force due to their different deformation modes compared with that of the uniform structures. For the impact loading tests, the initial peak force increased as the acute angle increased for the uniform specimens. Comparison experiments were carried out for specimens 50-55-60-65 with positive and negative gradients, and the results showed that the specimen with a negative gradient had a better energy absorption capacity.

Highlights • Compression behaviours of Miura-ori nylon metamaterials are experimentally and numerically investigated. • Quasi-static and impact loading tests are conducted. • The graded models have better energy absorption capacity (EAC) than the uniform models under quasi-static test. • Specimen with a negative gradient has better EAC than the one with a positive gradient under dynamic impact test.