摘要
在解决焊接热源沿任意空间路径移动的加载问题以及具有复杂形状的叶片在焊接时与空气之间的散热问题的基础上,对转轮实体模型焊接过程的温度场与应力场进行了数值模拟。得到了焊接应力的演变规律与焊后应力场的分布情况。结果表明,焊后应力的峰值出现在叶片与上冠或叶片与下环接触面附近的叶片上。结合转轮工作应力的分布状态,解释了混流式水轮机转轮的失效原因。
Francis turbine runner temperature field and stress field during welding processes are simulated, while considering thermal source movement along any complicated spatial route and heat loss from blade to air. The evolvement process of welding stress and the distribution of residual stress field after welding are obtained. The simulation result shows that maximal welding stress appears on the blade near the adjacent zone between blade and band or blade and crown. The invalidation reason of runner is explained, based on working stress distribution of runner.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2005年第2期52-55,共4页
Transactions of The China Welding Institution
关键词
焊接
叶片
应力场
失效
Failure analysis
Finite element method
Heat losses
Residual stresses
Temperature
Turbomachine blades
