Aperiodic Design Framework of Chiral Mechanical Metamaterials Considering Crashworthiness

doi:10.3901/JME.2025.17.266

Abstract

Abstract: Chiral mechanical metamaterials with asymmetric chiral geometry can exhibit rotational degrees of freedom under compression (or tension). However, the traditional periodic method and the limitation of additive manufacturing process have blocked the further development and application of chiral mechanical metamaterial, and the correlation between the chiral structures and the dynamic impact resistance properties lacks more systematic and in-depth research. The compression-to-twist mechanism underlying chiral mechanical metamaterial is analyzed utilizing a general assembly rule based on screw theory, and an aperiodic design framework with joint enhanced method is proposed, which effectively and efficiently realizes the geometric modeling and finite element modeling of various chiral configurations. Furthermore, evaluative indexes are proposed to characterize the overall chirality, interlayer deviation and interlayer consistency of the designed metamaterial configurations. Considering the constraints of additive manufacturing, chiral mechanical metamaterial samples using 316L stainless steel are manufactured by laser selective melting (SLM) technology. Through simulation and experimental verification of impact behavior under medium strain rate, the deformation mode, specific energy absorption, and the first peak force of the chiral mechanical metamaterial are comprehensively analyzed. The relationship between the chiral indexes and the impact performance is explored, and the influence of geometric parameters on the energy absorption performance elucidates an effective property control method.

Key words: chiral mechanical metamaterial, additive manufacturing, energy absorption, crashworthiness, aperiodic design

CLC Number:

O342

XU Weiyun, ZHANG Hanyu, LIU Zhao, ZHU Ping. Aperiodic Design Framework of Chiral Mechanical Metamaterials Considering Crashworthiness[J]. Journal of Mechanical Engineering, 2025, 61(17): 266-280.

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