Mechanical properties of novel folded kirigami metamaterials under quasi-static compression

Abstract

Origami and kirigami are effective approaches to fabricate the lightweight cellular metamaterials with extraordinary mechanical properties. However, the novel designs of such metamaterials are still limited. In this paper, a novel metamaterial similar to the typical Kelvin foams is proposed and fabricated via the origami and kirigami methods, and its mechanical properties are investigated. The quasi-static compression tests are first conducted to analyze the deformation characteristics and stress-strain responses. Numerical simulations are then carried out to simulate the tests. Furthermore, two methods including adjusting the wall thickness and introducing opening are adopted to alter the relative density of the metamaterials, and their influences on the plateau stress and specific energy absorption (SEA) are explored. Finally, analytical studies are conducted to predict the plateau stress, and good agreements between the analytical, numerical, and experimental results are obtained. Results reveal that the kinetic energy is primarily dissipated by unfolding the constitutive elements along the creases, and three typical stages are generated in the stress-strain curves. Increasing the wall thickness significantly improves

Theoretical modeling and optimization of the plateau force of tubular anti-tetrachiral structures

“…Ideally, the actual length of the ligaments does not change as the structure deforms, i.e. AB = AB = l m (7) where l m is the actual length of the ligament (l am or l cm ). The structure is compressed and the ligaments gradually bend.…”

“…Metamaterials represent a novel class of materials, and exhibit extraordinary properties that are not typically found in natural materials [1][2][3][4][5][6][7][8][9][10]. These materials have found widespread applications in fields such as optics [11], acoustics [12], mechanics [13][14][15][16][17].…”