Modeling of strongly coupled magneto-mechanical behavior in magneto-sensitive elastomers

磁敏弹性体中强耦合磁机械行为的建模

• 批准号: 257300638
• 负责人: Privatdozentin Dr. Marina Grenzer
• 金额: --
• 依托单位: Leibniz-Institut für Polymerforschung Dresden (IPF)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/257300638?language=en
• 关键词: Modeling; strongly; coupled; magneto; mechanical

Field-controllable functional polymers represent a relatively new class of applied materials exhibiting a strong coupling of mechanical and external fields. The application of such fields influences the interactions between different local material phases and may cause an evolution of the microstructure. A prominent example are magneto-sensitive elastomers (MSEs) featuring mechanical moduli that become enhanced under an applied magnetic field as well as the ability for magnetically induced deformations and actuation stresses. This makes MSEs very attractive for a variety of technical implementations, especially for actoric applications such as artificial muscles, sensors, micro-robots and micro-pumps. Since the effective coupled magneto-mechanical behavior is of special interest in these applications, an in-depth understanding of the structure-property relations in MSEs as well as suitable theories for computing the effective macroscopic material response are required.MSEs represent a two-component system, in which micron-sized magnetizable particles are embedded in a soft polymer network. The flexibility of polymer sub-chains between cross-links allows a considerable degree of particle rearrangement under strong magnetic fields. As a result, the particles are prone to organize themselves into chain-like microstructures, which may considerably influence the coupled magneto-mechanical properties of MSEs. In this joint project, two work groups from the Leibniz-Institute for Polymer Research Dresden (IPF) and the Institute of Solid Mechanics of TU Dresden (IFKM) develop adapted modeling and simulation techniques to capture the hierarchical material structure, account for its evolution and predict the resulting macroscopic, strongly coupled magneto-mechanical behavior of MSEs. The theoretical predictions will be compared between both groups and with existing literature results. The modeling strategies which are pursued at IPF and IFKM will be combined to develop a unified, hybrid multiscale framework which allows for an accurate but efficient prediction of the macroscopic response of realistic MSE samples. The particular challenge is the simultaneous consideration of inhomogeneous, macroscopic magnetic and mechanical fields and their interaction with the underlying evolving microstructure. It is expected that the developement of the unified approach will benefit from the scientific exchange within the SPP that already started in the first funding period. The overall performance of the hybrid multiscale framework will be investigated by comparing simulation results for realistic MSE specimens with the experimentally observed behavior.

场可控功能聚合物代表了一类相对较新的应用材料，表现出机械和外场的强耦合。这些场的应用影响了材料不同局部相之间的相互作用，并可能导致微观结构的演变。一个突出的例子是磁敏弹性体（MSEs），其机械模量在外加磁场下增强，并且具有磁诱导变形和驱动应力的能力。这使得mse对于各种技术实现非常有吸引力，特别是对于人造肌肉，传感器，微型机器人和微型泵等动态应用。由于有效的磁-力学耦合行为在这些应用中是特别感兴趣的，因此需要深入了解mse中的结构-性能关系以及计算有效宏观材料响应的合适理论。mse是一种双组分系统，其中微米级的可磁化颗粒嵌入在软聚合物网络中。交联之间聚合物子链的柔韧性允许在强磁场下相当程度的粒子重排。因此，颗粒容易组织成链状微观结构，这可能会极大地影响mse的耦合磁-力学性能。在这个联合项目中，来自德累斯顿莱布尼茨聚合物研究所（IPF）和德累斯顿工业大学固体力学研究所（IFKM）的两个工作组开发了适应的建模和仿真技术，以捕获分层材料结构，解释其演变并预测由此产生的宏观，强耦合mse的磁-力学行为。理论预测将在两组之间进行比较，并与现有文献结果进行比较。IPF和IFKM所追求的建模策略将结合起来，开发一个统一的混合多尺度框架，该框架允许对现实MSE样本的宏观响应进行准确而有效的预测。特别的挑战是同时考虑不均匀的宏观磁场和力学场以及它们与底层不断变化的微观结构的相互作用。预计统一方法的制定将受益于SPP内部已经在第一个资助期开始的科学交流。混合多尺度框架的整体性能将通过比较真实MSE试件的模拟结果与实验观察到的行为来研究。