钢管应力-感应电动势效应及其磁矩偏转原理

Stress-induction EMF effects and associated principle of magnetic moment deflection for steel tube

在轴向压力作用下,对Q235B钢管进行应力σ与感应电动势ε关系实验研究.将交流传感线圈磁芯设置于直径为D609mm钢管试件表面,使磁力线沿水平方向穿过管壁局部区域,并在钢管轴向感应出电动势.压力机施加荷载的同时,测量管壁感应电动势、应力和应变数据.试验表明:感应电动势ε随压应力σ增大而减小;应变δ随压应力σ增大而增加;实验数据拟合结果均符合线性关系.通过应力对铁磁质材料自旋磁矩产生的偏转作用分析,将应变与磁化强度加以联系,得到与实验数据规律相一致的、表达应力σ引起感应电动势ε变化的理论公式.

An experimental research of the relationship between stress δ and the induction EMF（ electromotive force） ε was carried out for Q235B steel tube, under axial compression. A magnetic core winded inducting coils with alternating current was put in the surface of steel tube, diameter D609 mm, then the magnetic line of force was made to penetrate the partial area of steel tube wall in the horizontal direction and the induction EMF was brought about in the axial direction of steel tube. While exerting the compressive load by a press, the data of induction EMF, stress and strain were measured. The experiment indicates that the EMF δ decreases with the increasing stress δ, but the strain 8 increases with the increasing stress or. These experimental data-fitting results conform to linear rules. Through analyzing the deflecting action of stress on the spin magnetic moment of ferromagnetic material, the strain was connected with the magnetizability. The theoretical formula in accord with the experimental data law was obtained and the reason why the stress δ brings on the induction EMF ε changing was expressed.