基于动态磁化的结构钢磁导率和电磁损耗测量方法

Measurement of magnetic permeability and magnetic loss of structural steel for dynamic magnetization

结构钢的磁导率和电磁损耗等磁参数的测量对于研究其应力状态、成分以及缺陷等具有重要意义。该文提出了一种利用动态磁化法快速测量结构钢磁导率和电磁损耗的方法,介绍了实现该方法的测量装置,并利用该方法测量了Q235钢的磁导率和电磁损耗,探讨激励电流幅值和频率对测量结果的影响规律。实验结果表明:该方法可用于测量结构钢处于弱正弦磁场下的磁导率和电磁损耗。随着激励电流幅值增大,磁导率和电磁损耗增大;随着激励频率增大,磁导率减小,电磁损耗增大。作为应用实例,该文还研究了磁导率和电磁损耗与构件应力的关系。结果表明:随着结构压应力减小,拉应力增大,磁导率和电磁损耗增大。该方法可用于对应力状态进行评价。

The magnetic permeability, magnetic losses and other e- lectromagnetic parameters of structural steel are important for pre- dicting the stresses, concentrations and defects. This paper presents a method based on dynamic magnetization for rapidly measuring the magnetic permeability and magnetic losses of structural steel. The magnetic permeability and magnetic losses of Q235 are measured to study the effects of amplitude and frequency of the excitation current on the measurement result. The results show that this method can be applied to measure the magnetic permeability and magnetic losses of structural steels with weak sinusoidal magnetic fields. As the am- plitude of the excitation current increases, the magnetic permeability and magnetic losses increase, while as the frequency of the excitation current increases, the magnetic permeability decreases and the mag- netic losses increase. This study also analyzes the relationship be- tween the stresses, the magnetic permeability and the magnetic los- ses. The results show that as the compressive stress decreases, the tensile stress, the magnetic permeability and magnetic losses all in-crease, so this method can be used to evaluate the stress state.