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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0.042 5;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。
Magnetic memory detection probe was fabricated by using MLX90393, a three-axis linear Hall sensor. Based on the Arduino hardware development platform, a metal magnetic memory testing system was developed. The 30CrMo material specimen was used as the test object, and the metal magnetic memory test was carried out under static loading. Magnetic memory signal variation and magnetic memory signal gradient value and tensile load between the changes. The experimental results show that the maximum value of the tangential component gradient of the magnetic memory signal on the surface of the specimen begins to change significantly when the tensile load reaches 16 kN and rapidly increases to 0.042 5 after 23 kN. The maximum value of the normal component gradient After the tensile load reaches 23 kN sharp increase to 0.55. The system provides an effective method for the determination and measurement of stress concentration in ferromagnetic materials.