Mechanical Performances of 3D Novel Adjustable Cubic Metallic Lattice Structures Based on Trigonometric Function

A novel metamaterial with 3D progressive stiffness, adjustable Poisson's ratio, and tunable energy absorption (EA) is proposed, offering potential applications in adaptive materials. Its structure is based on trigonometric function. This study proposes two 3D novel lattice structures, namely the sine‐curve‐based simple cubic (SCSC) structure and the cosine‐curve‐based simple cubic (CCSC) structure. Through comparative analysis with the traditional simple cubic (SC) structure, the performance advantages of the newly developed structures are thoroughly investigated. In this study, a series of quasistatic compression tests are conducted to investigate the compressive behavior of the structures. The reliability of the finite element (FE) analysis results is validated through comparison with the experimental data. The proposed structure demonstrates compliant deformation, allowing for uniform deformation and adjustable densification. FE method combined with homogenization algorithms are used to investigate the effective elastic properties. A comparative analysis of the mechanical performance of the lattice structure under varying structural parameters are conducted, and the accuracy of the numerical model is validated through compression experiments. The results show that the introduction of the “straight‐to‐curve” design strategy significantly enhances the EA capability. Additionally, elastic modulus, Poisson's ratio, isotropy, load‐bearing capacity, and EA efficiency of the material are further improved.