Experimental and numerical evaluation of bio-inspired lattice metamaterials under inplane compression loading.

This study proposes two lattice metamaterials (FS and HCS) inspired by a variation of face-centered cubic structure combined with the cross-section of horsetail grass. Under uniaxial compression and shear loading, the mechanical properties, deformation behavior, and energy absorption capacity of the structure were evaluated by varying the geometric parameters to improve the relative density of the structure by finite element method and experiment. The results show that the two structures differ little in mechanical properties when the volume density is low and converge when the volume density reaches 0.4. At the same time, when compared with their original structure, the new structures are improved in Young's modulus by 1.5 to 3.8 times, shear modulus by two times when the volume density is low, bulk modulus by 1.25 to 1.4 times, and total stiffness by 2.75 times. In addition, research shows that the two structures are highly isotropic when the Zener anisotropy ratio approaches 1. Finally, to evaluate the energy absorption ability of the two structures when improving the parameter geometric value, the research shows that increasing the number of unit cells greatly affects the structure's ability to absorb energy. When improving the diameter of the truss, the deformability of the structure decreases as the maximum compression force increases, while the effect of improving the thickness of cells on the special energy absorption capacity (SEA) tends to decrease. With good mechanical properties and energy absorption capacity, the structure is proposed for potential engineering applications. [ABSTRACT FROM AUTHOR]