导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (6): 526194-526194.doi: 10.7527/S1000-6893.2021.26194

• Articles • Previous Articles     Next Articles

Crashworthiness design of bio-inspired ring arrays for impact protection

XING Yun1,2, ZHANG Qiao1,2, YANG Xianfeng1,2, LIU Hua1,2, YANG Jialing1,2   

  1. 1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;
    2. Laboratory of Advanced Structural Impact and Biomimetic Mechanics, Beihang University, Beijing 100083, China
  • Received:2021-08-05 Revised:2022-01-17 Online:2022-06-15 Published:2022-07-07
  • Supported by:
    National Natural Science Foundation of China (12002027); Aeronautical Science Foundation of China (201941051001); China Postdoctoral Science Foundation (2021M700340)

Abstract: Inspired by the stiffness distribution of the beetle exoskeleton cuticle, a novel type bionic stiffness gradient ring array protective structure is proposed. This structure has excellent impact resistance, high stiffness programmability, and shape reconfigurability, and can be extended to a variety of size ratios and assembly frame types to meet more practical engineering impact protection requirements. Based on the numerical simulation technology, a finite element model of the biomimetic stiffness gradient ring protective system under impact loads is established. Combining experimental analysis and the theoretical model, we explore the propagation law of stress waves in the bionic stiffness gradient ring system and the impact mechanical behavior and protective capability of the bionic gradient ring system. The results reveal the ability of the concave stiffness gradient to significantly improve the protection performance of the bionic ring system. A complete parametric analysis is conducted to study the influence of the elastic modulus, radius and thickness distribution of the ring on the protective properties of the bionic stiffness gradient ring system, finally obtaining the optimal solution to the stiffness gradient programming.

Key words: impact resistance, bionic design, graded ring system, programmability, crashworthiness

CLC Number: