Abstract:
To develop lightweight structures with enhanced mechanical properties and excellent energy absorption capabilities, the new multi-bionic hollow curve (MHC) lattice structure has been proposed. The MHC structure exhibits high plateau stress, stiffness, strength, and specific energy absorption. Finite element models of the body centered cubic (BCC) lattice structures under quasi-static compression were established using Ls-Dyna software. The accuracy of the numerical model was validated by comparing the experimental and simulation results. Additionally, the mechanical and energy absorption properties of BCC, curve body centered cubic (CBCC), hollow body centered cubic (HBCC), and MHC lattice structures under quasi-static uniaxial compression were studied. The results show that the MHC lattice structure, by combining hollow and curved designs, significantly enhances the moment of inertia of the structure's cross-section and exhibits two deformation modes: strut bending and thin-walled crushing. This design increases the number of plastic hinges during compression, resulting in superior mechanical performance. Parametric studies show that when the amplitude is 0.8 mm, the wall thickness is 0.5 mm, and the outer diameter is 7.2 mm, the MHC lattice structure exhibits 176.3%, 231.3%, 424.0%, and 716.8% improvements in plateau stress, specific energy absorption, specific strength, and specific stiffness, respectively, compared to the BCC lattice structure. The integration of multiple biomimetic features offers an innovative strategy for designing lightweight, high-performance lattice structures with significant application potential.