基于模块化晶格的超材料的非线性力响应
Nonlinear force response of modular lattice-based metamaterials
- The University of Chicago（芝加哥大学）
- University of Colorado, Boulder（科罗拉多大学博尔德分校）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究针对模块化晶格超材料，利用其非线性屈曲行为，通过串联单元获得单个单元不具备的力响应，发现其循环载荷下的训练行为，为非线性应力响应设计提供新方向。
AI中文摘要：
基于晶格的超材料提供了轻质平台，其中局部不稳定性可控制全局力学响应，可应用于能量路由、振动隔离和冲击缓解。尽管在通过几何设计控制变形和屈曲序列方面已取得诸多进展，但耦合非线性单元在宽应变率范围内的行为及其依赖历史的响应仍有待探索。本文研究了可通过模块化架构利用其非线性屈曲行为的基于晶格的力学超材料。通过将模块化单元串联组合，我们表明它们的相互作用产生了瞬态弱化和增强力衰减等涌现力响应，这些是单个单元所不具备的。此外，选定的设计在循环载荷下表现出训练行为，在不同屈曲状态之间转变并揭示出依赖历史的力学响应。我们的结果表明，模块化、由不稳定性驱动的超材料不仅可通过几何形状，还可通过加载历史进行编程和调控，为力学系统中非线性应力响应的设计开辟了新途径。
英文摘要：
Lattice-based metamaterials provide lightweight platforms where local instabilities can govern the global mechanical response, enabling applications in energy routing, vibration isolation, and impact mitigation. Although much progress has been made in controlling deformation and buckling sequences through geometric design, the behavior of coupled nonlinear units over a large range of strain rates and their history-dependent response is less explored. Here, we investigate lattice-based mechanical metamaterials whose nonlinear buckling behavior can be harnessed through modular architectures. By combining modular units in series, we show that their interaction gives rise to emergent force responses, including transient weakening and enhanced force attenuation, that are absent in the individual modules. Furthermore, selected designs exhibit training behavior under cyclic loading, transitioning between distinct buckling states and revealing a history-dependent mechanical response. Our results demonstrate that modular, instability-driven metamaterials can be programmed and tuned not only through geometry but also through loading history, opening new avenues for designing a nonlinear stress-response in mechanical systems.
