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本文介绍了国外研究漏磁探伤所采用的两种理论模型——偶极子模型及有限元模型;影响漏磁场分布的因素和漏磁场信息分析;漏磁探伤中当量缺陷的概念;磁粉探伤的磁化规范选择问题;漏磁场与断裂力学的关系。此外,还介绍了在某些特殊情况下漏磁信号与许用应力的数学表达式。
In this paper, we introduce two theoretical models used in foreign countries to study MFL-dipole model and finite element model, the factors that influence the distribution of MFL and the information of MFL, the concept of equivalent defects in MFL, Magnetization specifications selection problem; leakage magnetic field and fracture mechanics. In addition, the mathematical expressions of MFL and allowable stress in some special cases are also introduced.