电磁热效应理论在薄板止裂技术上的应用  

Crack Arrest Effect in Thin Plates

作　　者：范华林[1] 陈平[2] 

机构地区：[1]清华大学工程力学系,北京100084 [2]解放军理工大学理学院,江苏南京211101

出　　处：《兵工学报》2005年第6期791-794,共4页Acta Armamentarii

摘　　要：给出了电磁热效应止裂技术耦合场理论的基本控制方程。探讨了稳恒电流作用下无限大薄板裂纹尖端电流密度及焦耳热源功率的计算表达式,并进一步推导了裂纹尖端区域温度场及热应力场的分布形式。本文提出了电流密度因子的概念,给出了平面条件下计算电流密度因子的复变函数方法及其表达形式。通过实例分析了使裂纹尖端熔化焊接所必须的电流密度的数量级,该计算结果与已有研究成果十分吻合。Governing equations in thermo-electromagnetic elastic problems were given. Expressions of current density and Joule heat source near the crack tip in an infinite plate under constant current were derived, as well as the temperature field and the stress field near the crack tip. The current density factor of plane cracks was defined and the complex function style of the current density factor was given in this paper. A calculation was illus- trated to demonstrate the magnitude of the current under which the material near the crack tip would melt and could be welded. The result of calculation agrees well with that of others published research results.

关 键 词：电磁学 裂纹 止裂 电流密度因子 电磁场 温度场 薄板 

分 类 号：O482.6[理学—固体物理]