聚脲防腐管道中超声导波的缺陷检测研究

RESEARCH OF DETECTING DEFECTS IN POLYUREA ANTI-CORROSIVE PIPES BY USING ULTRASONIC GUIDED WAVES

聚脲涂料作为近些年发展起来的新型防腐材料,现已广泛应用于管道内外壁的防腐保护。为了克服传统超声波检测效率低的短板,提出了超声导波检测技术对聚脲防腐管道中裂纹损伤的检测应用设想,利用数值仿真的方式对此展开研究。通过分析聚脲防腐管道的解析模型,借助有限元分析软件Abaqus,建立黏弹性-弹性复合材料的三维圆柱模型,并模拟不同激励频率下L(0,2)模态导波在其中的传播状态。结合频散和衰减特性两方面的研究,获取优化的激励频率,并对聚脲防腐管道进行不同类型缺陷检测的仿真分析和实验验证。研究结果表明,数值仿真结果与实验验证基本吻合,说明了超声导波对聚脲防腐管道的缺陷检测方法有效,同时也可实现对缺陷定位分析。

In recent years,as a new type of anti-corrosion material,polyurea coatings have been widely applied to the protection of internal and external walls for pipes.In order to overcome the shortage of traditional ultrasonic testing with low efficiency,the imagine of detecting some cracks in polyurea anti-corrosive pipes was proposed,which based on ultrasonic guided wave detection technology,and it would be studied by numerical simulation.By analyzing the analytical model in the polyurea anti-corrosion pipes,established the three-dimensional cylindrical model of the viscoelastic-elastic composite material by finite element software Abaqus,and simulated the propagation state in which the L(0,2)modal guided wave with the different excited frequencies.Combined with the study of its dispersion and attenuation for selecting optimize frequency,and the analysis of defect detection for the model were accomplished the simulated.The results of research show that the results of numerical simulation are basically consistent with experimental verification,which show that it is effective to use the ultrasonic guided waves for detecting defects of polyurea anti-corrosion pipes and realizing the location of defects.