Simulation of magneto-induced rearrangeable microstructures of magnetorheological plastomers
Simulation of magneto-induced rearrangeable microstructures of magnetorheological plastomers
复制标题
磁流变塑性体磁致可重排微观结构的模拟
DOI：
10.1039/c3sm52130c
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发表时间：
2013-01-01
期刊：
影响因子：
3.4
通讯作者：
Jiang, Wanquan
中科院分区：
文献类型：
--
作者：
Liu, Taixiang;Gong, Xinglong;Jiang, Wanquan
采用颗粒级动力学模拟方法研究磁流变塑性体（MRP）的磁致微观颗粒结构，为研究MRP的宏观物理力学性能奠定基础。在模拟中，提出了一个修正的磁偶极相互作用力模型来描述两个紧密磁化的铁粒子之间的磁相互作用。还建立了颗粒-颗粒和颗粒-基体相互作用的其他微观分析模型。模拟结果表明，在恒定磁场作用下，MRP颗粒形成链状和柱状结构。当MRP经受步进式面内旋转磁场时，微结构重新排列以形成平行于旋转平面的层状结构。此外，通过改变外加磁场的空间分布，还可以获得其它形状或复杂的磁致可逆微结构。在外加磁场的每一步变化过程中，随着微观颗粒结构的演变，与微观结构相关的磁势能和应力状态在初始阶段变化剧烈，然后逐渐接近各自的稳定值。
Magneto-induced microscopic particulate structures of magnetorheological plastomers (MRP) are investigated using particle-level dynamics simulation, as this is a basis for studying the macroscopic physical or mechanical properties of MRP. In the simulation, a modified magnetic dipolar interaction force model is proposed to describe the magnetic interaction of two close magnetized iron particles. Other microscopic analytical models of particle–particle and particle–matrix interactions are also constructed. The simulation results show that chain-like and column-like particulate structures are formed when MRP is placed into a steady uniform magnetic field. When MRP is subjected to a stepwise in-plane rotating magnetic field, the microstructure rearranges to form a layered structure parallel to the rotation plane. Moreover, some other patterns or complex magneto-induced rearrangeable microstructures can be achieved by spatially changing the external magnetic field. With the evolution of the microscopic particulate structure in every changing step of the external magnetic field, the microstructure dependent magnetic potential energy and stress state vary sharply at the beginning and then approach respective stable values gradually.