磁致伸缩颗粒高弹聚合物本构关系的研究

项目名称： 磁致伸缩颗粒高弹聚合物本构关系的研究

项目编号： No.11202086

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 金科

作者单位： 兰州大学

项目金额： 28万元

中文摘要： 磁致伸缩颗粒高弹聚合物是磁敏高弹聚合物的一种，通过将磁致伸缩颗粒嵌入高弹聚合物中制备而得，拓宽了常规稀土超磁致伸缩材料的使用工作频率，改善其综合机械性能，已成为超磁致伸缩材料的一个新的发展方向。对于各种采用磁敏高弹聚合物的智能器件来说，定量预测力学与磁学的输入输出量之间的关系是优化器件性能的前提，所以研究磁敏高弹聚合物的本构关系是非常重要的。然而磁致伸缩颗粒高弹聚合物具有复杂的力-磁耦合机制，对于这些力-磁耦合机制的全面考虑是建立磁致伸缩颗粒高弹聚合物本构关系的关键。本项目拟针对磁致伸缩颗粒高弹聚合体的本构关系进行研究。从其力-磁耦合机制出发，研究掺杂颗粒的磁致伸缩效应；对磁致伸缩颗粒所受的外磁场施加的磁力以及颗粒之间的磁相互作用进行分析；在此基础上，基于连续介质力学以及热力学理论建立各向同性磁致伸缩颗粒高弹聚合物有限应变的非线性力-磁耦合的本构模型，并通过实验研究对模型进行验证和完善。

中文关键词： 本构关系；力-磁耦合；非线性；磁致伸缩；复合材料

英文摘要： Magnetostrictive particle-filled elastomers are a new kind of magneto-sensitive elastomers. They are magnetostrictive particle dispersed in polymer matrixs whose mechanical properties are altered by the application of external magnetic fields. Since they can eliminate those shortcomings such as brittleness and large eddy-current losses in the tradition giant magnetostrictive materials under high-frequency magnetic field,they have been attracting more and more attention in research. To efficiently control the magnetostrictive elastomer devices, an accurate theoretical model of constitutive law, i.e. the relations between stress and strain, magnetic field and magnetization, is essential for predicting their responses in various operating conditions.Complicated mechanisms are responsibe for the magneto-mechanical coupling in magnetostrictive elastomers.Considering these mechanisms, a constitutive model of magnetostrictive particle-filled elastomers will be presented using the second law of thermodynamics plus the conservation laws method of continuum mechanics, which can capture the magnetostrictive of the inclusions and the magnetic force exerted on particles by the external magnetic field, as well as the magnetic interactions between particles. The model validation will be performed by magnetomechanical measureme

英文关键词： constitutive relations；magneto-mechanical coupling；nonlinear；magnetostrictive；composite