基于磁记忆管道应力检测信号仿真和实验研究

Simulation and Experimental Study of Pipeline Stress Detection Signals Based on Magnetic Memory

为了研究应力对磁记忆信号的影响,建立了力磁耦合模型,利用磁导率作为中间量建立磁记忆信号和应力之间的耦合关系。利用有限元法仿真了管道在不同管径、不同壁厚以及不同内压情况下应力集中区的磁记忆信号特征的影响规律,进行了不同内压下磁记忆信号采集实验。研究结果表明:管道的壁厚、管径以及内压都会影响应力集中区的应力,进而使得磁记忆信号发生了变化。

In order to study the influence of stress on the magnetic memory signal,a force-magnetic coupling model was established,and the coupling relationship between the magnetic memory signal and the stress was established by using the magnetic permeability as an intermediate quantity.And the finite element method was used to analyze the influence law of the magnetic memory signal characteristics in the stress concentration area of the pipeline under different pipe diameters,different wall thicknesses and different internal pressures.Experiments of magnetic memory signal acquisition under different internal pressures were carried out.The results show that the pipe wall thickness,pipe diameter and internal pressure can affect the stress in the stress concentration area,and then the magnetic memory signal can change.