Safety evaluation of tube with incomplete penetration defect based on simulation
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摘要: 压力管道作为调相机运行中不可缺少的部件，通常采取焊接方式进行连接，因此焊接质量直接影响调相机的安全。利用Comsol仿真模拟软件对含未焊透缺陷的压力管道及其尖端裂纹应力强度因子进行计算，并结合标准GB/T 19624—2019《在用含缺陷压力容器安全评定》对焊接管道安全性给予相关评价。结果表明，未焊透缺陷深度临界尺寸为0.85 mm，安全评价指标临界数值为0.44；未焊透缺陷尖端裂纹强度因子大于管道材料门槛应力强度因子（1.98 MPa ·mm1/2），外载荷作用下裂纹扩展，裂纹尖端应力场强度因子KI增大；当裂纹尖端应力场强度因子达到20钢断裂韧性（30.4 MPa ·mm1/2）时，裂纹将出现失稳扩展，造成材料的断裂。Abstract: The pressure tube is a necessary accessory for the phase modifier for normal service, and which is usually connected by welding, therefore, the welding quality directly affects the safety of the phase modifier. In this paper, we calculated and analyzed the stress intensity factor of both the pressure pipe with incomplete penetration defects and its tip crack by using the Comsol simulation software. In addition, we evaluated on the safety of welded tubes based on the standard GB/T 19624-2019 "Safety Assessment of Pressure Vessels with Defects in Use". The results show that the critical dimension of the depth of incomplete penetration defect is 0.85 mm, and the critical value of the safety evaluation index is 0.44. The crack intensity factor at the tip of the incomplete penetration defect is greater than the threshold stress intensity factor of the tube material (1.98 MPa ·mm1/2). The crack expands under the action of external load, and the stress field intensity factor KI at the crack tip increases. When the stress field intensity factor at the crack tip reaches the fracture toughness of 20 steel 30.4 MPa ·mm1/2, the crack will expand unsteadily, thus resulting in material fracture.
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