Abstract

A physical and mathematical model is considered to support the investigation of the prospects of using the effect of metal’s “magnetic memory” for the nondestructive testing of items made from ferromagnetic materials located in the Earth’s magnetic field. Based on the finite-element method, an algorithm and a computer code for the 3D computations of the magnetic potential distribution in a medium with nonuniform magnetic permeability are worked out. The developed methods and software tools are used to model the leakage field near the clamped heating pipes of steam boilers. Relationships demonstrating the interdependence between the change in magnetic induction and the magnetic leakage field are obtained. Satisfactory agreement is observed between the calculated and experimental data on the distribution of the field strength of the magnetic leakage on the surface of the heating pipe.

中文翻译：

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加热管磁机械效应的数值分析

摘要

考虑使用物理和数学模型来支持对使用金属“磁记忆”效应对位于地球磁场中的铁磁材料制成的物品进行无损检测的前景的研究。基于有限元方法，研究了磁导率不均匀介质中磁势分布的3D计算算法和计算机代码。所开发的方法和软件工具用于对蒸汽锅炉固定加热管附近的泄漏场进行建模。获得证明磁感应变化与漏磁场之间的相互依赖性的关系。