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可编程超材料:磁 - 热 - 力多场调控可编程力学超材料

  • 2026-02-01 21:32:16
可编程超材料:磁 - 热 - 力多场调控可编程力学超材料

第一作者单位

上海交通大学

文章链接

https://doi.org/10.1002/adma.202207349.

摘要

面向可重构结构应用的下一代主动式超材料,需具备响应迅速、无缆操控、可逆形变、可编程(多模态)变形能力,同时还需拥有形状锁定特性。在各类驱动调控方式中,磁控技术凭借响应速度快、可实现远程操控驱动的优势脱颖而出,但该技术存在一项显著缺陷 —— 需要持续施加磁场以维持材料的变形状态,这一短板严重限制了其在结构工程领域的实际应用。形状记忆聚合物(SMPs)所具备的形状锁定特性,恰好能够弥补磁控技术的这一不足。然而,形状记忆聚合物本身存在固有不可逆性,这又会制约其作为主动式超材料的可重构性能。此外,在已有的可编程调控方案中,激光辐照、电弧焊接等技术不仅需要输入大功率能量,还存在能量利用效率低下的问题,难以满足工程化应用的需求。针对上述多重技术瓶颈,本研究构建并验证了一套磁 - 热 - 力多场耦合调控工具。该工具通过向形状记忆聚合物施加磁 - 热 - 力耦合触发的预应力,并结合非对称磁力矩诱导的结构失稳效应,成功使单一材料体系同时实现无缆操控、可逆形变、低功耗可编程变形与形状锁定四项核心功能。本研究的核心创新点在于,实现了磁控技术与形状记忆聚合物热 - 力学行为两大物理机制的协同增效,整个调控过程无需合成新型材料,也不需要输入大功率能量即可完成可编程变形。这一技术方案为主动式超材料的研发开辟了全新路径,有望推动柔性高刚度软体机器人、多模态变形结构、力学计算器件等领域的技术革新,助力相关装备实现可逆化、可编程化的设计与应用。

部分美图快览-1
总结

本研究证实,借助形状记忆聚合物(SMP)的温敏刚度特性,以及由磁力矩实现精准调控的预应力,能够使单一形状记忆聚合物体系具备无缆操控、可逆形变、可编程变形的能力,同时还可实现稳定的形状锁定功能。研究团队通过磁矩的非对称排布设计,结合基于结构失稳效应的构型设计与形状记忆聚合物的回复特性,让晶格结构实现多模态、多场耦合的变形响应,且整个可编程变形过程无需额外输入能量。尤为关键的是,通过对磁力矩的局部调控,该体系可实现非均匀变形,进而构筑功能梯度结构 —— 这类结构是传统形状记忆聚合物全局调控方法(如模具定型、极限机械加载)难以制备的。本研究提出的磁 - 热 - 力多场耦合设计理念,能够大幅推动下一代主动式超材料的发展进程,助力其满足可重构结构领域的严苛应用需求,即实现响应迅速、无缆操控、可逆形变、可编程(多模态)变形与形状锁定的一体化功能。这种基于多物理场耦合的技术方案,在可重构结构设计领域实现了范式革新 —— 其核心优势在于,仅依靠结构力学设计即可达成目标性能,无需合成新型材料,也无需为可编程变形过程额外投入能量。这一创新的结构设计方案,为未来智能变形材料的研发开辟了全新分支,有望推动具备可逆变形、形状保持、无缆操控与高能效可编程特性的智能机器人材料的研制,为航空航天变形结构、柔性机器人、智能防护装备等领域的技术升级提供核心支撑。

部分美图快览-2

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  1. CONNECT:[ UseTime:0.000682s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001000s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002179s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000459s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000515s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000599s ]
  8. SELECT * FROM `article` WHERE `id` = 465054 LIMIT 1 [ RunTime:0.003747s ]
  9. UPDATE `article` SET `lasttime` = 1770507645 WHERE `id` = 465054 [ RunTime:0.003962s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001798s ]
  11. SELECT * FROM `article` WHERE `id` < 465054 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000863s ]
  12. SELECT * FROM `article` WHERE `id` > 465054 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000777s ]
  13. SELECT * FROM `article` WHERE `id` < 465054 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014445s ]
  14. SELECT * FROM `article` WHERE `id` < 465054 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003656s ]
  15. SELECT * FROM `article` WHERE `id` < 465054 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.028892s ]
0.147410s