利用三轴线性霍尔传感器MLX90393制作磁记忆检测探头,基于Arduino硬件开发平台研制金属磁记忆检测系统,以30CrMo材料试件为试验对象,在静载拉伸作用下开展金属磁记忆试验研究,分析磁记忆信号变化规律以及磁记忆信号梯度值与拉伸载荷之间的变化特征.实验结果表明,拉伸过程中试件表面的磁记忆信号切向分量梯度最大值在拉伸载荷达到16 kN时开始明显变化,在23 kN之后急剧增大到0.0425;法向分量梯度最大值在拉伸载荷达到23 kN之后急剧增大到0.55.本系统为铁磁性材料中应力集中的判定和测量提供了一种有效的检测方法.%The Magnetic memory detection probe is fabricated by a three-axis linear Hall sensor MLX90393.A type of metal magnetic memory testing system is developed,based on the Arduino hardware development platform. The metal magnetic memory test of 30CrMo material is carried out under the static load,analyzes the variation of the magnetic memory signal,and analyzes the variation between the magnetic memory signal gradient and the tensile load. The re-sults show that,the maximum gradient of the tangential component of the magnetic memory signal on the surface of the test specimen changes markedly at the tensile load of 16 kN,and sharply increases to 0.0425 after 23 kN;The maxi-mum value of the normal component gradient increases abruptly to 0.55 after the tensile load reach 23 kN. This system provides an effective method for the determination and measurement of stress concentration in ferromagnetic materials.
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