摘要
基于热弹塑性有限元法,采用轴对称模型对管道焊接工艺进行模拟分析,探讨了热源模型参数分别在固定温度峰值和线能量条件下对焊接残余应力的影响,并对固定温度峰值条件下的焊缝熔融区和热影响区尺寸与热源模型参数的关系进行了分析。结果表明:保持一定温度峰值条件下,设定不同热源模型参数,残余应力值变化显著;采用固定线能量的方法进行焊接模拟时,焊接残余应力对热源模型参数的改变不敏感;在材料属性、模型一定的条件下,热影响区尺寸的改变量与热源模型参数设定值存在一定的关系,但是两者并不相等。
Effect of welding heat source shape parameters on residual stress in 2 - D axi - symmetric mod- el was investigated under the condition of constant peak temperature and heat input rate respectively. In the condition of constant peak temperature, the relationship between both the melting zone and HAZ （ Heat Affected Zone） and the parameters was studied. The results show that the heat source shape param- eters have significant influence on residual stress. The condition of constant heat input rate can make re- sidual stress results more stable than the other one. With the same model and material, there is a certain relationship between temperature distribution and parameters of heat source. However, the weld pool size doesn＇t equal to heat source shape parameters.
出处
《压力容器》
2013年第8期27-32,共6页
Pressure Vessel Technology
基金
中央高校基本科研业务费专项资金资助(2011QNA07)
中国矿业大学研究生实践与科研创新资助项目(GSF121106)
关键词
热源模型参数
数值模拟技术
焊接残余应力
heat source shape parameters
numerical simulation technology
welding residual stress
