Dynamic mechanical behaviour of the magneto-sensitive elastomers in a homogeneous magnetic field

磁敏弹性体（MSE）是一类相对较新的功能高分子材料，其形状和力学性能在磁场作用下可以很容易地改变。mse由分散在弹性体基体中的微米级铁颗粒组成。近年来，对磁致形变的理论和实验研究都取得了成功。另一方面，只有少数微观方法描述静态MSE模量。申请人不知道任何描述磁场作用下动态力学模量的微观模型。然而，了解这类材料的动态特性对于其多种技术应用是极其重要的，其中外部机械载荷取决于振幅和频率。本项目的目的是开发和验证第一种微观方法，用于描述均匀磁场作用下mse的动态力学性能。矩阵性质将用一个简单的三次网络模型来描述。为了考虑磁性粒子的不同空间分布，我们将使用我们以前研究过的一些晶格模型以及随机生成的分布。计划研究各向同性和各向异性粒子分布的mse在低频和中频下的动态行为，并将其与实验结果进行比较。

Magneto-sensitive elastomers (MSE) is a relatively new class of functional polymer materials, the shape and mechanical properties of which can be easily changed upon application of a magnetic field. MSEs consist of micron-sized iron particles dispersed within an elastomeric matrix. In the last years the magneto-induced deformation of the MSEs has been studied successfully experimentally and theoretically. On the other side, there are only a few microscopic approaches for description of the static MSE moduli. The applicants do not know any microscopic models for description of the dynamic-mechanical moduli under application of a magnetic field. Understanding of the dynamic properties of this class of materials is however extremely important for their multiple technical applications, in which the external mechanical loading depends on the amplitude and frequency.The aim of this project is to develop and to validate a first microscopic approach for description of dynamic mechanical properties of the MSEs under application of a homogeneous magnetic field. The matrix properties will be described using a simple cubic network model. To consider different spatial distributions of magnetic particles, a number of lattice models considered in our previous studies as well as stochastically generated distributions will be used. It is planned to investigate the dynamic behavior of the MSEs with isotropic and anisotropic particle distributions at low and intermediate frequencies and to compare it with experimental findings.