直缝焊管表面裂纹的电磁激励红外热像无损检测数值模拟  

Numerical simulation of non-destructive test of surface crack of straight seam welding pipe by electromagnetically stimulated thermography

作　　者：李龙波[1] 李国华[1] 高聚春[1] 林晓凤[1] 谢利明[1] 

机构地区：[1]中国矿业大学(北京)机电与信息工程学院,北京100083

出　　处：《金属热处理》2013年第9期110-113,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51075388)

摘　　要：通过ANSYS有限元软件对直缝焊管表面裂纹无损检测进行模拟,研究激励频率和电流密度、线圈提离高度及裂纹尺寸对红外热像仪缺陷检测的影响规律。结果表明,随电磁激励频率和电流密度的增大,最大温差和最优检测时间段增加;激励频率为1 kHz时,不存在可检测时间段。随线圈提离高度增加,裂纹可检性下降。随裂纹长度和深度增加,最大温差和可检测时间分别增加和减小;裂纹宽度变化对可检测性影响不大。本仿真结果的准确性有待试验检验。Non-destructive test of surface crack of straight seam welding pipe is stimulated by ANSYS software. Influence of electromagnetic excited frequency, intensity of excited current, coil lift-off height and crack size on the crack detection of thermal infrared imager were researched. The results show that with electromagnetic exitation frequency and current density increasing, the maximum temperature and the optimal detection period increase. There is no detectable time period when frequency is 1 kHz. The crack dectectability decreases with coil life-off height increasing. The maximum temperature difference and the optimal detection period increase and decrease respectively with crack length and depth increasing. The change of crack width has little impact on detection. The accuracy of simulation results are still needed to be tested by practice.

关 键 词：直缝焊管 表面裂纹 无损检测 数值模拟 

分 类 号：TG115.28[金属学及工艺—物理冶金]