Abstract
NiTi alloy lattice structures are crucial for reusable energy absorption due to their shape memory effects. However, existing NiTi alloy lattice structures always suffer from localized deformation bands during loading, causing local strains to exceed the recoverable strain limit of the alloy and significantly reducing their reusable energy-absorbing capacity. In this study, we developed a NiTi alloy helical lattice structure (HLS) to effectively prevent localized deformation bands. This is attributed to its struts distributing stress and strain uniformly through torsional deformation, thereby alleviating local stress concentrations and suppressing the formation of localized deformation bands. Additionally, its unit cells provide mutual support and reinforcement during deformation, effectively preventing the progression of localized deformation bands. The NiTi alloy HLS exhibits superior reusable energy absorption compared to previously reported reusable energy-absorbing materials/structures and enhanced damage tolerance under large compression strain. This study provides valuable insights for the development of high-performance reusable NiTi alloy energy-absorbing lattice structures.
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