载流薄板中裂纹形成瞬间尖端附近的热电磁场 THERMO-ELECTROMAGNETIC FIELD AROUND THE INSTANTLY FORMED C

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载流薄板中裂纹形成瞬间尖端附近的热电磁场

THERMO-ELECTROMAGNETIC FIELD AROUND THE INSTANTLY FORMED CRACK TIPS IN A CURRENT-CARRYING PLATE

给出了载流无限大薄板在形成裂纹的瞬间,尖端区域附近的电流密度以及由于集中效应而产生的焦耳热源功率表达式.在此基础上,通过对热传导方程求解温度场,得到了裂纹尖端区域的温度表达式.通过算例分析证实了:在电磁场作用瞬间,由于裂尖处的热集中效应,能够使其在附近一定范围内熔化形成微小焊口.从而可达到阻止裂纹扩展的目的.

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作 者: 胡宇达 白象忠 HU Yu-da BAI Xiang-zhong  
作者单位:燕山大学土木工程与力学系,秦皇岛,066004 
刊 名:工程力学  ISTIC EI PKU
英文刊名:ENGINEERING MECHANICS 
年,卷(期):2000 17(3) 
分类号:O346.1 
关键词:热磁弹性   电流   温度场   裂纹止裂  
机标关键词:载流薄板裂纹形成集中效应表达式温度场算例分析热源功率区域裂纹扩展裂纹尖端方程求解电流密度磁场作用热传导熔化焦耳基础焊口 
基金项目:中国科学院资助项目,黑龙江省齐齐哈尔市科技局科研项目 
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