Stress is one of the important factors that cause fatigue and fracture of ferromagnetic components, and its accurate measurement is of great significance to ensure the safety and reliability of components. Accordingly, a set of alternating magnetic field stress measurement system was designed and developed. The system includes a measurement sensor, DDS signal excitation module, signal conditioning module, signal acquisition, and processing module. The system was used to carry out uniaxial tensile testing of Q235 steel, and the influence of different testing parameters on the testing signal was studied. The research results show that: in the elastic stage, there is a good linear relationship between the real part of the detection signal and the tensile stress. This characteristic quantity can be used to evaluate the stress of ferromagnetic materials; In addition, the correlation coefficient and sensitivity of different detection parameters were compared through linear fitting analysis, and a set of best detection parameters were obtained. Under this parameter, the correlation coefficient reaches 0.991, and the sensitivity is 7.318 mV/kN. The above research provides test methods and techniques for ferromagnetic material stress measurement.

应力是引起铁磁元件疲劳和断裂的重要因素之一，其准确测量对确保元件的安全性和可靠性具有重要意义。因此，设计并开发了一套交变磁场应力测量系统。该系统包括测量传感器，DDS信号激励模块，信号调节模块，信号采集和处理模块。该系统用于Q235钢的单轴拉伸测试，研究了不同测试参数对测试信号的影响。研究结果表明：在弹性阶段，检测信号的实部与拉应力之间存在良好的线性关系。该特征量可用于评估铁磁材料的应力。另外，通过线性拟合分析比较了不同检测参数的相关系数和灵敏度，得到了一组最佳检测参数。在该参数下，相关系数达到0.991，灵敏度为7.318 mV / kN。上述研究提供了铁磁材料应力测量的测试方法和技术。