铍环焊接热弹塑性分析的轴对称和三维模型对比

Comparison of Axisymmetric and 3-D Thermal Elastic-Plastic Analytical Models for Beryllium Welding

摘要:

采用轴对称和三维模型对镀环激光束焊接过程的温度场和应力场进行了有限元分析，表明2种模型分析结果的趋势基本一致，轴对称模型可以得到焊接准稳态时的温度场和应力场分布，三维模型可以得到整个移动焊接过程的温度场和应力场分布，焊接起弧和收弧部位的残余应力比准稳态时约高20％。

Abstract:

Both axisymmetric and 3-D models are used to simulate the temperature and stress fields of laser beam welding process of beryllium ring. It is shown that the computed results of two models are identical. The temperature and stress fields can be obtained in the quasi-balance state using the axisymmetric model and in the whole process using the 3-D model. The residual stresses at the start and the end welding are about 20 percent larger than that in the quasi-balance state.