载流金属材料裂纹尖端电磁应力的数值模拟  

Simulation of the Electromagnetic Stress on the Crack Tip in Metal Carrying Current

作　　者：马振宁[1] 高明[1,2] 汪青杰[3] 

机构地区：[1]沈阳师范大学物理科学与技术学院 [2]沈阳师范大学先进材料的微观结构与性能实验室,沈阳110034 [3]沈阳建筑大学理学院

出　　处：《材料导报》2006年第4期117-119,共3页Materials Reports

基　　金：辽宁省教育厅科研项目(05L415);沈阳师范大学实验中心主任基金项目(sy200512)

摘　　要：用数值模拟方法研究了金属裂纹尖端电磁应力的分布情况,给出了电流分布、磁场分布和电磁应力的分布。模拟结果表明,金属材料裂纹尖端受的电磁应力是最大的,并且这个力的大小随着电流密度的增加而增大,裂纹尖端的电磁力指向金属的内部。通过具体算例表明,在金属能承受的电流密度下,金属材料裂纹尖端的电磁应力约能达到1MPa的数量级。因此,在研究电磁场处理金属裂纹时,不能忽略电磁应力。The electromagnetic force acting on the crack in a metal is studied by numerical simulation method. The distributions of electric current, magnetic field and the electromagnetic stress are given. The results show that electromagnetic stress on the crack tip are strongest, and the electromagnetic stress will become stronger with the electric current rising. The electromagnetic stress on the crack tip points into mental inner. It will make the crack have a growing tendency. The value of the electromagnetic stress can be up to the order of l MPa under the electric current that the metal can endure. Therefore the effects of the electromagnetic stress should not be neglected in the studies of interaction between the electromagnetic fields and the cracks in metals.

关 键 词：载流金属薄板 裂纹尖端 电磁理论 电磁应力 数值模拟 

分 类 号：O346.1[理学—固体力学]