具有初始织构的多晶铁磁形状记忆合金力磁耦合相变机理与力学性能分析

项目名称： 具有初始织构的多晶铁磁形状记忆合金力磁耦合相变机理与力学性能分析

项目编号： No.11272136

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 朱玉萍

作者单位： 江苏大学

项目金额： 86万元

中文摘要： 具有初始织构的多晶铁磁形状记忆合金不仅具有传统的温控和应力控制形状记忆合金的特点，还可以在磁场的作用下输出应变。该材料制备简单，成本低，抗压强度高，具有广泛的应用前景。然而，到目前为止人们对该材料在力、磁耦合作用下的相变机理和力学特性的研究还属于初步探索阶段，对其本构特性认识还不够充分。本项目拟对该材料在力、磁耦合作用下的力学性能进行测试，观察相变微结构特征，分析其细观结构、应力、磁场等因素对材料相变和力学特性的影响，建立相应的定量关系；结合细观力学方法和热动力学原理，考虑织构的取向分布和材料的各向异性，建立一种能准确表征材料微细观结构和磁力学路径的各向异性本构模型；编制适用于模拟该材料相变机理和力学特性的计算程序，与试验数据进行比较，验证理论的正确性与有效性；在该理论框架下系统地分析织构、外力和磁场等因素对多晶铁磁形状记忆合金力学性能的影响，为该材料在工程实际中的应用提供理论指导。

中文关键词： 铁磁形状记忆合金；织构；本构模型；各向异性；数值分析

英文摘要： Polycrystal ferromagnetic shape memory alloys (PFSMAs) with pre-textured are a new type of functional material. In addition to the strains induced from temperature or stress controlled conventional shape memory behavior, large strains can be produced in this alloy under the external application of moderate magnetic fields.It is easy to process and less costly. These properties make PFSMAs attractive for a wide range of applications. However, till now some studies for these material focused on the fundamental stage. And many important properties are not yet investigated in detail. This project will evaluate magneto-mechanical behavior,phase transformation characteristics and its evolution ,and mechanical parameters. Based on the micromechanical and the thermodynamic theory, considering anisotropy, the orientation distribution function of crystallographic texture, magneto-mechanical paths and microstructure,a constitutive model for PFSMAs will be developed. Numerical simulation will be conducted,which can extend this model to complex structure and complex magnetic and mechanical field.By using the proposed model, the effect of orientation distribution function of crystallographic texture,the load and magnetic field on magnetic-field-induced strains and distribution of stress will be analyzed in detail. The propos

英文关键词： Ferromagnetic shape memory alloy；Texture；Constitutive model；Anisotropy；Numerical analysis