论文部分内容阅读
在热-弹塑性理论的基础上,以环形对接焊缝连接的G20Mn5铸钢圆管与Q345普通圆管为分析模型,采用ANSYS有限元分析软件,选择内生热率热源模型模拟焊接热输入,利用生死单元技术模拟焊接填充过程,选取普通圆管的径厚比、铸钢圆管与普通圆管的壁厚比及普通圆管的壁厚作为残余应力的影响因素进行参数化分析。结果表明,在焊缝金属区,随普通圆管径厚比的增加,内、外表面横向压应力及内表面纵向拉应力增大;随铸钢圆管与普通圆管的壁厚比的增加,内表面横向压应力增大而外表面横向压应力减小;随普通圆管的壁厚的增加,内表面横向压应力增大而外表面横向拉应力减小,内表面纵向拉应力减小而外表面纵向拉应力增大。在此规律基础上,提出了可供工程参考的残余应力的范围。
Based on the theory of thermo-elasto-plasticity, the G20Mn5 round steel pipe and Q345 common round pipe connected by the annular butt weld are taken as the analysis model. The ANSYS finite element analysis software is used to select the endogenous heat rate heat source model to simulate the welding heat input, Using the technology of life and death cell to simulate the welding filling process, the diameter-thickness ratio of ordinary pipe, the wall thickness ratio of steel pipe and ordinary pipe and the wall thickness of common pipe were chosen as the influencing factors of residual stress. The results show that the lateral compressive stress on the inner and outer surfaces and the longitudinal tensile stress on the inner surface increase with the increase of the diameter-thickness ratio of the ordinary round tube in the weld metal zone. With the increase of wall thickness ratio , The transverse compressive stress on the inner surface increases and the lateral compressive stress on the outer surface decreases. With the increase of the wall thickness, the lateral compressive stress on the inner surface increases and the lateral tensile stress on the outer surface decreases and the longitudinal tensile stress on the inner surface decreases The external surface of the longitudinal tensile stress increases. Based on this law, the range of residual stress for engineering reference is proposed.