Unveiling dynamic bifurcation of Resch-patterned origami for self-adaptive impact mitigation structure

arXiv - PHYS - Adaptation and Self-Organizing Systems Pub Date : 2024-04-23 DOI:arxiv-2404.14737

Yasuhiro MiyazawaDepartment of Aeronautics and Astronautics, University of Washington, Seattle, Washington, USADepartment of Mechanical Engineering, Seoul National University, Gwanak-gu, Seoul, South Korea, Chia-Yung ChangDepartment of Aeronautics and Astronautics, University of Washington, Seattle, Washington, USA, Qixun LiDepartment of Aeronautics and Astronautics, University of Washington, Seattle, Washington, USA, Ryan Tenu AhnDepartment of Aeronautics and Astronautics, University of Washington, Seattle, Washington, USA, Koshiro YamaguchiDepartment of Aeronautics and Astronautics, University of Washington, Seattle, Washington, USADepartment of Mechanical Engineering, Seoul National University, Gwanak-gu, Seoul, South Korea, Seonghyun KimDepartment of Mechanical Engineering, Seoul National University, Gwanak-gu, Seoul, South Korea, Minho ChaDepartment of Mechanical Engineering, Seoul National University, Gwanak-gu, Seoul, South Korea, Junseo KimDepartment of Mechanical Engineering, Seoul National University, Gwanak-gu, Seoul, South Korea, Yuyang SongToyota Research Institute North America, Ann Arbor, Michigan, USA, Shinnosuke ShimokawaToyota Research Institute North America, Ann Arbor, Michigan, USA, Umesh GandhiToyota Research Institute North America, Ann Arbor, Michigan, USA, Jinkyu YangDepartment of Mechanical Engineering, Seoul National University, Gwanak-gu, Seoul, South Korea

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Abstract

In the classic realm of impact mitigation, targeting different impact scenarios with a universally designed device still remains an unassailable challenge. In this study, we delve into the untapped potential of Resch-patterned origami for impact mitigation, specifically considering the adaptively reconfigurable nature of the Resch origami structure. Our unit-cell-level analyses reveal two distinctive modes of deformation, each characterized by contrasting mechanical responses: the folding mode that displays monostability coupled with strain-hardening, and the unfolding mode that manifests bistability, facilitating energy absorption through snap-through dynamics. Drop tests further unveil a novel dynamic bifurcation phenomenon, where the origami switches between folding and unfolding depending on impact speed, thereby showcasing its innate self-reconfigurability in a wide range of dynamic events. The tessellated meter-scale Resch structure mimicking an automotive bumper inherits this dynamically bifurcating behavior, demonstrating the instantaneous morphing into favorable deformation mode to minimize the peak acceleration upon impact. This suggests a self-adaptive and universally applicable impact-absorbing nature of the Resch-patterned origami system. We believe that our findings pave the way for developing smart, origami-inspired impact mitigation devices capable of real-time response and adaptation to external stimuli, offering insights into designing universally protective structures with enhanced performance in response to various impact scenarios.

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揭示雷希图案折纸的动态分叉，实现自适应冲击缓解结构

在传统的冲击缓解领域，用一个通用设计的装置来应对不同的冲击情景仍然是一个无法克服的挑战。在本研究中，我们深入探讨了雷希图案折纸在减缓冲击方面尚未开发的潜力，特别是考虑到雷希折纸结构的适应性可重构特性。我们的单元细胞级分析揭示了两种截然不同的变形模式，每种模式都具有截然不同的机械响应：折叠模式表现出单稳态，同时伴有应变硬化；展开模式则表现出双稳态，通过快速通过动力学促进能量吸收。跌落测试进一步揭示了一种新颖的动态分叉现象，即折纸根据冲击速度在折叠和展开之间切换，从而展示了它在各种动态事件中与生俱来的自我重构能力。模仿汽车保险杠的米级网格雷希结构继承了这种动态分叉行为，展示了瞬间变形为有利的变形模式，以最大限度地降低撞击时的峰值加速度。这表明雷希图案折纸系统具有自适应和普遍适用的冲击吸收特性。我们相信，我们的研究结果为开发能够实时响应和适应外部刺激的智能折纸启发式冲击缓解装置铺平了道路，为设计具有增强性能的通用保护结构以应对各种冲击情景提供了启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Adaptation and Self-Organizing Systems

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