方钢纵向磁化时端面上的磁力分水岭和磁荷分水岭  

The Watersheds of Magnetic Forces and Magnetic Charges on the End Surfaces of a Rectangular Steel Component Magnetized Longitudinally

作　　者：仲维畅[1] 

机构地区：[1]南京燃气轮机研究所,南京210037

出　　处：《无损检测》2005年第7期349-351,363,共4页Nondestructive Testing

基　　金：国家自然科学基金资助项目(59571064后续)

摘　　要：由磁的库仑定律推导出矩形均布磁荷体系中任一磁荷所受到的磁力,从而得出了方钢纵向磁化时端面上的磁力分水岭(磁力从指向矩形的一边变为指向另一边的分界线)和磁荷分水岭(磁荷分别向端面两边聚集的分界线)。它们的物理意义和解析表达式虽不同,但其因果关系密切,故两者的趋势应一致,并应在某些区域内相差无几。数值计算验证了上述推论,且在矩形的四个棱角附近磁荷分水岭与磁力分水岭几乎吻合。On the basis of the Coulomb's law for magnetism, the magnetic force acting upon any one magnetic charge in a system, in which the magnetic charges distributed uniformly over a rectangle, was deduced. Thereby the watershed of magnetic forces (the boundary, from which the direction of magnetic forces pointing to one side of the rectangle changed to point towards the other) and the watershed of magnetic charges (the line of demarcation, from which magnetic charges gathered respectively onto the two edges of the end surface) on the end surfaces of a rectangular steel component magnetized longitudinally were obtained. Their physical meanings and analytical expressions were different, but their causality was closed each other. So their tendencies should be identical, and there should be hardly any difference between the two in some region. The inference mentioned above was verified by a numerical calculation. And in the vicinity of the four corners of a rectangle the watershed of magnetic charges practically coincided with the watershed of magnetic forces.

关 键 词：磁粉探伤 方钢 磁力分水岭 磁荷分水岭 

分 类 号：TG115.27[金属学及工艺—物理冶金] TG115.28[金属学及工艺—金属学]