Abstract
Lattice structures inspired by biological models often exhibit excellent energy absorption characteristics and gain increasing attention. Inspired by the shape of starfruit, this work proposes a starfruit-inspired biomimetic lattice structure (SBLS) with variable cross-sectional size. The compression performance and energy absorption efficiency of the SBLS are investigated by non-axial compression experiment and simulation. In addition, the potential application scenario of SBLS is presented. SBLS shows excellent energy absorption effect and compression performance. The structural variables of SBLS are changed to study their effects on the energy absorption characteristics. The SBLS with variable cross-section performs better than that with constant cross-section size. Compared with L1-11.2, the energy absorption (EA) and specific energy absorption (SEA) values of L1-5.36 increase by 85.16 % and 119.90 %. Compared with SBLS, the SEA values of L1-5.36, S-0.8, N-5 and T-1.6 increase by 36.31 %, 28.56 %, 35.47 % and 19.98 %. These SBLS models show novel deformation modes. The cells take on the shape of a man with his hands raised upward, and the SBLSs look like people holding hands overlapping. The deformation mode of L2-6.745 likes multiple Yuanbao arranged together. In summary, SBLS exhibits excellent energy absorption characteristics and has broad application prospects.
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