20年来中国磁偶极子理论研究进展

简述20年来中国无损检测中磁偶极子理论研究的概况和进展，主要介绍磁偶极子，有限长磁偶极线和极带，磁粉颗粒的受力，磁化场方向对粉粉显现缺陷的影响，棒料，管材和方钢的纵向磁化，工件表面沟槽深度对其引起漏磁场的影响，周向磁化工时工件底棱上的杂乱显示成因，圆盘边缘柱面上沟槽内外漏磁场的蟹 表达式和针状磁介质对两个点磁荷间磁力的影响等。

PROGRESS OF MAGNETIC DIPOLE THEORY RESEARCH IN CHINA DURING RECENT TWENTY YEARS

The general situation and progress of magnetic dipole theory research during recent twenty years in China were introduced briefly including magnetic dipole; linear and strip magnetic dipoles of finite lengths; magnetic force on a magnetic particle; the effect of magnetizing field orientation on the revelation of defect by magnetic particles; longitudinal magnetization of rod, tube and cuboid steel; the relationship between the slot depth in a workpiece and magnetic leakage field; the cause of stray magnetic pattern along base apex edges of a workpiece magnetized circumferentially; the analytic expression for the magnetic leakage fields inside and outside the slot on the cylindrical surface of a disc; and the effect of a needle like magnetic medium on the magnetic force between two point magnetic charges.