磁流变弹性体的力-磁-热耦合力学行为及性能表征

Magnetorheological elastomer (MRE) is a new type of functional materials and it has promising application in aerospace, national defense, transportation and other basic fields. However there are still some problems existed in MREs, such as the low magnetorheological effect, the unstable performance, the conflict between the magnetorheological effect and the mechanical properties, etc. These problems must be addressed before its wild applications in engineering. Therefore, in this project we will study the mechanical-magneto-thermal coupling behaviour and properties characterization of MRE. Based on the microstructure observation of MRE, together with the mechanical and magnetic properties characterization of MRE under mechanical-magneto-thermal coupled loading, the effects and mechanism of the matrix viscoelasticity and multi-field loading on the magnetorheological effect and the mechanical properties of MRE will be investigated systematically. A viscoelastic constitutive model of MRE under coupled field will be proposed and the rheological mechanism and the mechanical properties optimization method of MRE in coupled filed will be presented. Meanwhile, in this project we will develop the magneto and mechanical properties characterization method of MRE under coupled mechanical-magneto-thermal field. A systematic performance evaluation system of MRE under coupled field will be established, which will effectively enhance the research level of MRE in domestic.

磁流变弹性体是一类新型功能材料，在航空航天、国防、交通运输等基础领域有着广泛的应用前景，然而当前磁流变弹性体还存在流变效应不高、性能不稳定、流变性能与机械性能之间矛盾等瓶颈问题，严重限制了其工程应用。为此，本项目从磁流变弹性体的微观结构入手，结合其在力-磁-热等耦合作用下的力学性能和磁学性能表征，系统地研究基体的粘弹性，力-磁-热耦合作用等因素对磁流变弹性体力学行为的影响规律及其作用机理，建立磁流变弹性体在多场耦合下的粘弹性本构模型，研究磁流变弹性体的流变机理，提出磁流变弹性体多场耦合力学性能的优化方法。同时，本项目将发展磁流变弹性体在力-磁-热等多场耦合下力学性能与磁学性能的实验表征方法，系统地建立磁流变弹性体在多场耦合下的性能评价体系，将有效地推动国内磁流变弹性体研究水平的提高。

磁流变弹性体是一类新型功能材料，在航空航天、国防、交通运输等基础领域有着光明的应用前景。为此，本项目首先从磁流变弹性体的制备入手，给出了几类纳米级磁性粒子的制备方法，并基于制备的磁性粒子开展了磁流变弹性体的制备工作，并研究了材料在不同温度下的动态力学性能。针对均匀磁场下磁流变弹性体材料形变较小的问题，本课题研究了梯度设计磁流变弹性体材料在均匀磁场下，以及均匀磁流变弹性体在梯度磁场下的力学响应，给出了材料的变形模型。从磁流变弹性体材料的微观结构入手，结合基体材料的超弹性本构模型，给出了材料的损伤与失效的计算方法，研究了磁性粒子参数对磁流变弹性体材料力学性能与破坏行为的影响规律，给出了磁流变弹性体力学性能的数值仿真计算方法，将有效地推动国内磁流变弹性体研究水平的提高。