压力容器焊缝超声TOFD检测的COMSOL模拟
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摘要
运用多物理场耦合有限元软件COMSOL对压力容器焊缝的超声响应特性进行有限元分析,并分析了不同探头参数,如中心距、频率、角度等对检测结果的影响。仿真模拟结果表明,声波传播过程的仿真模拟有利于更好地理解缺陷特征,提高缺陷的评定和识别。探头参数的仿真模拟有利于检测工艺的制定,适当缩小探头中心距有助于分离混叠的直通波和缺陷波信号;适当减小探头角度能有效提高信号分辨率;检测时需要合理选择探头频率,薄板检测时选择较大频率的探头,厚板检测时选择较小频率的探头。
The multi-physics coupling finite element software COMSOL was used to perform finite element analysis on the ultrasonic response characteristics of pressure vessel welds,and the effects of different probe parameters such as center distance,frequency,and angle on the test results were analyzed.The simulation results show that the simulation of sound propagation process is conducive to better understanding the defect characteristics and improving the assessment and identification of defects.The simulation of the probe parameters is conducive to the development of the inspection process.Properly reducing the center distance of the probe helps to separate the aliased through-wave and defect wave signals;appropriately reducing the probe angle can effectively improve the signal resolution;reasonably selecting the probe frequency is recommended and the basic principle is that a little higher frequency should be selected for thin-plate inspection and lower frequency should be selected for thicker boards.
The multi-physics coupling finite element software COMSOL was used to perform finite element analysis on the ultrasonic response characteristics of pressure vessel welds,and the effects of different probe parameters such as center distance,frequency,and angle on the test results were analyzed.The simulation results show that the simulation of sound propagation process is conducive to better understanding the defect characteristics and improving the assessment and identification of defects.The simulation of the probe parameters is conducive to the development of the inspection process.Properly reducing the center distance of the probe helps to separate the aliased through-wave and defect wave signals;appropriately reducing the probe angle can effectively improve the signal resolution;reasonably selecting the probe frequency is recommended and the basic principle is that a little higher frequency should be selected for thin-plate inspection and lower frequency should be selected for thicker boards.
引文
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[2]MERAZI-MEKSEN T,BOUDRAA M,BOUDRAA B.Mathematical morphology for TOFD image analysis and automatic crack detection[J].Ultrasonics,2014,54(6):1642-1648.
[3]关卫和,阎长周,张保中,等.我国压力容器行业TOFD检测技术的应用和进展[J].无损检测,2010,32(12):961-963.
[4]袁涛,曹怀祥,祝卫国,等.TOFD超声成像检测技术在压力容器检验中的应用[J].压力容器,2008,25(2):58-60.
[5]徐智,崔英颖,郑振顺,等.TOFD在厚壁压力容器检测中的应用[J].中国化工装备,2007,9(4):22-24.
[6]BASKARAN G,RAO C L,BALASUBRAMANIAM K.Simulation of the TOFD technique using the finite element method[J].Or Insight,2007,49(11):641-646.
[7]BELYTSCHKO T,TABBARA M.Dynamic fracture using element-free galerkin methods[J].International Journal for Numerical Methods in Engineering,2005,39(6):923-938.
[8]李淑君,王惠泉,赵文玉,等.基于COMSOL多物理场耦合仿真建模方法研究[J].机械工程与自动化,2014(4):19-20.
[9]刘静.不锈钢电阻点焊质量超声波定量及智能化检测研究[D].长春:吉林大学,2015.
[10]宋小春,王亚午,涂君.基于超声衍射时差法的缺陷检测技术仿真分析[J].传感器与微系统,2015,34(5):55-58.