磁控形状记忆合金传感特性的实验研究

发布时间：2018-06-28 19:00

本文选题：MSMA + 传感特性　；参考：《武汉科技大学》2015年硕士论文

【摘要】：磁控形状记忆合金（Magnetically Controlled Shape MemoryAlloy，简称MSMA）是一种新型的智能材料。该材料具有优异的磁控形状记忆特性，在磁场的作用下可获得较大的磁感生应变并对外输出应力。在偏置磁场中，对已经发生磁感生应变的MSMA材料加载机械脉冲将其压缩，由于材料磁导率发生变化会对磁路中磁感应强度的大小产生影响，这就是磁控形状记忆逆特性（传感特性），为MSMA能够运用在传感器领域提供了理论基础。目前国内外对其研究主要集中在MSMA的磁控形状记忆特性而对其传感特性研究较少。本文将对MSMA的传感特性进行实验研究，，并对MSMA在偏置磁场中应力、应变和磁感应强度之间的关系进行建模分析。在对MSMA材料的微观结构、形变机理、材料特性以及影响因素做了基础研究之后，借助CAD、Pro/E、ANSYS等软件进行设计和仿真，结合电磁感应相关的知识，制作了测试MSMA材料传感特性的实验台。以芬兰AdaptaMat公司生产的Ni2MnGa磁控形状记忆合金为研究对象，通过对实验台中的电流、温度进行实时控制，记录MSMA材料在偏置磁场中的压应变、压应力以及磁路中磁感应强度的变化等数据。通过对实验结果进行分析，发现了MSMA材料传感特性的最佳偏置磁场和最佳环境温度。最后以能量守恒定律为模型框架对MSMA材料的传感特性进行建模分析，通过数学模型得到了偏置磁场中MSMA材料的应变、应力和磁感应强度之间的数学关系。研究表明在最佳环境温度和最佳偏置磁场中，对MSMA材料施加应力使其发生应变，能对磁路中的磁感应强度产生较大的影响，体现出较高的传感灵敏度。本文的研究工作对基于MSMA材料的传感器的开发具有一定的指导意义。
[Abstract]:Magnetically controlled shape memory alloy (MSMA) is a new type of smart material. The material has excellent magnetic shape memory properties and can obtain large magnetically induced strain and output stress under the action of magnetic field. In the bias magnetic field, the MSMA material with magnetically induced strain is compressed by a mechanical pulse, because the change of the permeability of the material will affect the magnitude of the magnetic induction intensity in the magnetic circuit. This is the inverse characteristic of magnetically controlled shape memory (sensing characteristics), which provides a theoretical basis for the application of MSMA in the field of sensors. At present, the research of MSMA is mainly focused on the magnetic shape memory characteristics of MSMA, but less on its sensing characteristics. In this paper, the sensing characteristics of MSMA are experimentally studied, and the relationship between the stress, strain and magnetic induction intensity of MSMA in a bias magnetic field is modeled and analyzed. After the basic research on the microstructure, deformation mechanism, material characteristics and influencing factors of MSMA materials, the design and simulation of MSMA materials are carried out by means of CADX Prop / EN ANSYS software, and combined with the relevant knowledge of electromagnetic induction. An experimental bench for measuring the sensing characteristics of MSMA materials was made. Taking Ni _ 2MnGa magnetically controlled shape memory alloy produced by AdaptaMat Company of Finland as the research object, the pressure strain of MSMA material in the bias magnetic field was recorded by real-time controlling the current and temperature in the test rig. Data of compressive stress and magnetic induction intensity in magnetic circuit. Through the analysis of the experimental results, the optimum bias magnetic field and the optimum ambient temperature of the sensing characteristics of MSMA are found. Finally, based on the energy conservation law, the sensing characteristics of MSMA materials are modeled and analyzed, and the mathematical relations between the strain, stress and magnetic induction intensity of MSMA materials in the bias magnetic field are obtained by mathematical model. The results show that in the optimum ambient temperature and the optimum bias magnetic field, the stress on the MSMA material causes the strain, which can have a great influence on the magnetic induction intensity in the magnetic circuit, and the sensitivity of the sensor is higher. The research work in this paper has certain guiding significance to the development of the sensor based on MSMA material.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34;TP212

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