Investigation of magneto-mechanical interactions of non-grain oriented electrical steel – analysis of mechanical and magnetic fatigue using the effect of the Barkhausen noise

当使用这种材料制成的部件和零件时，材料性能的疲劳对应用性能有显著影响。虽然机械疲劳是结构材料的关键应用标准，但其他技术性能的疲劳，如电工钢的磁性能，通常不被考虑。因此，拟议项目的目的是首先生产使用Cu和Nb作为合金元素的新型非晶粒取向电工钢，其特征是与传统电工钢相比具有更高的机械强度。高速电机需要高机械强度电工钢以获得产生的离心力。速度越高，电动机的功率密度就越大。尽管在当今操作期间电动机的转子速度的增加的旋转需求和可能的动态变化，但是在文献中没有非常彻底地研究或讨论该主题。电工钢的磁性能对机械应力非常敏感。该项目的主要目标是将机械疲劳与循环加载导致的磁特性变化相关联，以了解和量化其影响。在经受机械疲劳载荷之前，对不同合金化制造的电工钢带进行轧制并经受不同的最终退火工艺。巴克豪森噪声分析方法用于量化磁劣化，而这是一种常用的表征部件机械性能和疲劳的方法。一个“磁性”韦勒曲线推导出从所获得的实验数据的表征的磁性变化的结果，循环加载。该数据还用于通过对磁维勒曲线进行建模来估计循环载荷导致的磁劣化。该项目由三个主要目标组成：电工钢的磁疲劳和机械疲劳的研究和建模，通过扩展巴克豪森噪声分析的测量频谱来量化效果，以及无取向电工钢的抗疲劳材料设计。

The fatigue of material properties has a significant influence on the application’s properties when components and parts constructed with this material are present. While mechanical fatigue is a key application criterion for structural materials, the fatigue of other technological properties, such as the magnetic properties of electrical steel, is generally not considered. The aim of the proposed project is therefore to initially produce new types of non-grain-oriented electrical steel grades using Cu and Nb as alloying elements, which are characterized by a higher mechanical strength compared to conventional electrical steel grades. High mechanical strength electrical steel is required for high speed electrical machines to acquire the resulting centrifugal forces. The higher the speed, the larger the power density of the electric motor will be. Despite of the increasing rotational demands and possible dynamic changes of the electric motor’s rotor speed during operation nowadays, this topic is not very thoroughly studied or discussed in literature. The magnetic properties of electrical steel are very sensitive to mechanical stress. The main goal of the project is to correlate the mechanic fatigue to the change in magnetic properties as a result of cyclic loading in order to understand and quantify the effects. The differently alloyed manufactured electrical steel strips are rolled and subjected to different final annealing processes before being subjected to mechanical fatigue loading. The method of Barkhausen noise analysis is utilized to quantify the magnetic deterioration, whereas it is an established method to usually characterize the mechanic properties and fatigue of components. A “magnetic” Wöhler Curve is deduced from the obtained experimental data of the characterization of the magnetic property change as a result of cyclic loading. The data is additionally used to enable an estimation of magnetic deterioration as a result of cyclic loading by modeling of the magnetic Wöhler curve. The project is comprised of three main objectives: Study and modeling of the magnetic and mechanic fatigue of electrical steel, a quantification of effects by expanding the measurement spectrum of the Barkhausen noise analysis and a fatigue-resistent material design of non-oriented electrical steels.