捕获纽带动力学对火游艇在负载下凝聚力起到重要作用
Robert J Wagner1, Samuel C Lamont2, Zachary T White2
1Sibley School of Mechanical & Aerospace Engineering, Cornell University, Ithaca, NY.
概括
火游艇通过在紧张状态下稳定纽带来表现出自适应性自我愈合,显示出捕获纽带动态. 这种力稳定提高了性,但导致高应变时形成空隙,影响修复率.
科学领域:
- 材料科学 材料科学 材料科学
- 生物模拟学是一种生物模拟学.
- 机器人技术 机器人技术 机器人技术
背景情况:
- 自然界中的动态网络利用可逆债券来实现自我愈合和能量消耗等功能.
- 宏观的动态网络需要主要的债券,以保持凝聚力和修复,而不是依赖于二次相互作用的分子网络.
- 了解宏观动态网络中的适应机制对于开发弹性材料至关重要.
研究的目的:
- 为了研究由相互连接的火 (Solenopsis invicta) 形成的二维的单轴拉伸反应.
- 确定由生物组成的宏观动态网络如何在机械应力下适应性稳定其结构.
- 探索火游艇的潜力,作为适应性结构材料的灵感.
主要方法:
- 对火游艇的拉力反应进行实验分析.
- 离散的数值建模模,以模拟单轴张力下的行为.
- 观察债券动态,应变率,空隙形成和机械回收.
主要成果:
- 火游艇在拉力应变下表现出对结合的适应性稳定,这是捕获结合动态的特征.
- 低张力率诱导了类似弹性的反应,而不是理论上的爬行,延迟了的溶解,提高了性.
- 在35%以上的压力下,空隙由于应力局部化而核化和生长,影响结构修复,直到恢复初始密度.
结论:
- 火游艇表现出积极的,记忆驱动的,对刺激有反应的行为,它们的结构适应机械负荷.
- 强力稳定机制延迟了的故障,并提高了材料的性.
- 在高拉伸率后观察到较慢的修复动力学表明一种机械记忆形式,为适应性材料设计提供了洞察力.
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