Magneto-sensitive bistable soft actuators: Experiments, simulations, and applications
Magneto-sensitive bistable soft actuators: Experiments, simulations, and applications
复制标题
磁敏双稳态软执行器：实验、模拟和应用
DOI：
10.1063/1.5062490
复制
发表时间：
2018-11-26
影响因子：
4
通讯作者：
Chen, Zi
中科院分区：
文献类型：
--
作者：
Hou, Xue;Liu, Yin;Chen, Zi
具有两种稳态特性的双稳态结构被广泛应用于设计在机械力、膨胀、热膨胀等各种激励下的快速、高力输出执行器。本文设计了一种磁致动机构，利用磁致动来实现屈曲梁两个弯曲稳定构型之间的可逆形状转换。梁由硅橡胶基质和嵌入的微米级铁颗粒组成。当周围磁场的大小超过阈值时，这些铁颗粒的磁响应赋予复合束从一种稳定形状到另一种稳定形状的能力。通过分别分析电磁场和磁力学场，我们提出了一种简单有效的计算方法来数值预测跳跃开始时的临界电流。对于不同的材料和几何参数，包括束流厚度、材料的铁粒子混合比和束流到电磁铁的距离，计算的临界电流与实验的临界电流吻合很好。概念验证设计在磁响应型软开关和弹射器弹射小物体方面的应用证明是有效的，为设计非接触式、低电压驱动的双稳态结构提供了新的见解。具有两个稳态的双稳态结构已被广泛应用于设计在机械力、膨胀、热膨胀等各种刺激下的快速高力输出执行器。本文设计了一种磁致动机构，利用磁致动来实现屈曲梁两个弯曲稳定构型之间的可逆形状转换。梁由硅橡胶基质和嵌入的微米级铁颗粒组成。当周围磁场的大小超过阈值时，这些铁颗粒的磁响应赋予复合束从一种稳定形状到另一种稳定形状的能力。通过分别分析电磁场和磁力学场，我们提出了一种简单有效的计算方法来数值预测跳跃开始时的临界电流。对于不同的材料，计算的临界电流与实验的临界电流吻合较好。
Bistable structures featuring two stable states have been widely applied in designing fast and high-force-output actuators under various types of stimuli, such as mechanical force, swelling, thermal expansion, and so on. In this paper, we designed a magneto-actuated mechanism to realize the reversible shape transition between two curved stable configurations of a buckled beam using magneto actuation. The beam is composed of a silicone elastomer matrix with embedded micro-sized iron particles. The magnetic response of these iron particles endows the composite beam with the ability to snap from one stable shape to the other when the magnitude of the surrounding magnetic field exceeds the threshold value. By separately analyzing the electric-magnetic field and the magnetic-mechanical field, we formulate a simple and efficient computational method to numerically predict the critical current on the onset of snap-through. The computational and experimental critical currents show good agreement for different material and geometrical parameters, including the thickness of the beams, iron particle mixing ratios of the material, and the distances of the beam to the electromagnet. The proof-of-concept design is demonstrated to be efficient in the application of a magneto-responsive soft switch and a catapult for ejecting small objects, providing new insights into designing contactless, low-voltage-actuated bistable structures.Bistable structures featuring two stable states have been widely applied in designing fast and high-force-output actuators under various types of stimuli, such as mechanical force, swelling, thermal expansion, and so on. In this paper, we designed a magneto-actuated mechanism to realize the reversible shape transition between two curved stable configurations of a buckled beam using magneto actuation. The beam is composed of a silicone elastomer matrix with embedded micro-sized iron particles. The magnetic response of these iron particles endows the composite beam with the ability to snap from one stable shape to the other when the magnitude of the surrounding magnetic field exceeds the threshold value. By separately analyzing the electric-magnetic field and the magnetic-mechanical field, we formulate a simple and efficient computational method to numerically predict the critical current on the onset of snap-through. The computational and experimental critical currents show good agreement for different mat...