当前位置: X-MOL 学术Extreme Mech. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of imperfections on pseudo-bistability of viscoelastic domes
Extreme Mechanics Letters ( IF 4.7 ) Pub Date : 2021-09-06 , DOI: 10.1016/j.eml.2021.101477
Tianzhen Liu 1, 2 , Yuzhen Chen 2 , Liwu Liu 3 , Yanju Liu 3 , Jinsong Leng 1 , Lihua Jin 2
Affiliation  

Snap-through instability of viscoelastic materials is known to generate novel behavior, featured as pseudo-bistability, i.e. the capability of a system in maintaining a deformed configuration for a certain period of time after removal of an external load, followed by snapping back to its initial configuration automatically, due to the combination of time-dependent mechanical property and geometric nonlinearity of the system. This work numerically, experimentally, and analytically examines spherical viscoelastic domes with predesigned geometric imperfections that can control the structural stability and tune the snap time, which is defined as the time that a dome remains almost stationary in the deformed configuration after the release of external forces. The results show that even an imperfection with a small magnitude can play a significant role in pseudo-bistability. An imperfection with a positive amplitude shifts a viscoelastic dome towards bistable behavior, corresponding to a longer snap time, while an imperfection with a negative amplitude shifts the dome towards monostable behavior, resulting in a shorter snap time. This work can open up new opportunities for controlling spatiotemporal behavior of structures for multi-functionalities.



中文翻译:

缺陷对粘弹性圆顶伪双稳态的影响

众所周知,粘弹性材料的快速通过不稳定性会产生新的行为,以伪双稳态为特征,即系统在移除外部负载后在一段时间内保持变形构型的能力,然后迅速恢复到其状态。由于系统的时间相关机械特性和几何非线性的组合,自动初始配置。这项工作以数值、实验和分析的方式检查了具有预先设计的几何缺陷的球形粘弹性圆顶,这些缺陷可以控制结构稳定性并调整捕捉时间,捕捉时间定义为释放外力后圆顶在变形配置中几乎保持静止的时间. 结果表明,即使是很小的缺陷也可以在伪双稳态中发挥重要作用。具有正振幅的缺陷使粘弹性圆顶向双稳态行为移动,对应于更长的捕捉时间,而具有负振幅的缺陷使圆顶向单稳态行为移动,从而导致更短的捕捉时间。这项工作可以为控制多功能结构的时空行为开辟新的机会。

更新日期:2021-09-20
down
wechat
bug