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<p>Nickel–titanium (NiTi) alloy lattice structures demonstrate significant potential for reusable impact protection applications due to their shape memory effect. However, their energy absorption behavior and shape recovery properties under dynamic impact loading have not been investigated. This study systematically examines the energy absorption behavior and shape recovery characteristics of two additively manufactured NiTi alloy lattice structures, the single helical lattice (SHL) and the double helical lattice (DHL), under dynamic impact loads. Experimental results show that as impact velocity and drop hammer mass increase, the macroscopic strain of both structures gradually increases, while their stress levels and energy absorption behavior remain nearly unchanged. The shape recovery rates of both structures decrease with increasing impact velocity and drop hammer mass. Finite element analysis results indicate that the stress distribution in both structures is relatively uniform. The DHL structure exhibits superior stress distribution and load-bearing efficiency compared to the SHL structure. During cyclic impact, the velocity–time response of the DHL structure gradually deviates from linearity, showing slower acceleration changes at the early stage and faster changes at the later stage. After three impact-heating cycles, the DHL structure maintains a shape recovery rate above 80% and retains its structural integrity, demonstrating strong damage tolerance. This study provides important insights for advancing the application of NiTi alloy lattice structures under dynamic impact deformation conditions.</p>

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Dynamic Impact Response and Shape Recovery Characteristics of Additively Manufactured NiTi Alloy Helical Lattice Structures

  • 期刊论文

  • 发表日期：

    2026年4月3日

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  • Meng Zhou,
  • Haohang Li,
  • Helong Liu,
  • Ying Yang,
  • Lishan Cui,
  • Shijie Hao

摘要

Nickel–titanium (NiTi) alloy lattice structures demonstrate significant potential for reusable impact protection applications due to their shape memory effect. However, their energy absorption behavior and shape recovery properties under dynamic impact loading have not been investigated. This study systematically examines the energy absorption behavior and shape recovery characteristics of two additively manufactured NiTi alloy lattice structures, the single helical lattice (SHL) and the double helical lattice (DHL), under dynamic impact loads. Experimental results show that as impact velocity and drop hammer mass increase, the macroscopic strain of both structures gradually increases, while their stress levels and energy absorption behavior remain nearly unchanged. The shape recovery rates of both structures decrease with increasing impact velocity and drop hammer mass. Finite element analysis results indicate that the stress distribution in both structures is relatively uniform. The DHL structure exhibits superior stress distribution and load-bearing efficiency compared to the SHL structure. During cyclic impact, the velocity–time response of the DHL structure gradually deviates from linearity, showing slower acceleration changes at the early stage and faster changes at the later stage. After three impact-heating cycles, the DHL structure maintains a shape recovery rate above 80% and retains its structural integrity, demonstrating strong damage tolerance. This study provides important insights for advancing the application of NiTi alloy lattice structures under dynamic impact deformation conditions.