CAJ | 학술논문

涡流热成像可以对金属材料表面、近表面缺陷进行快速准确的检测。采用涡流热成像与脉冲相位分析相结合的方法，针对裂纹附近相位谱的分布规律及温度场对相位谱的影响关系问题，分别对带有上表面裂纹和下表面裂纹的45＃钢料进行感应加热仿真和实验分析。结果表明，相位谱分布与温度大小无关，只与温度变化趋势有关，相位谱图对不均匀加热有很好的抑制作用，可以扩大裂纹的检测范围，当频率低于12．5 H z时能够清晰地识别裂纹。结合实验验证了仿真结论的正确性，为下一步利用相位信息实现缺陷的定量检测提供参考。
와류열성상가이대금속재료표면、근표면결함진행쾌속준학적검측。채용와류열성상여맥충상위분석상결합적방법，침대렬문부근상위보적분포규률급온도장대상위보적영향관계문제，분별대대유상표면렬문화하표면렬문적45＃강료진행감응가열방진화실험분석。결과표명，상위보분포여온도대소무관，지여온도변화추세유관，상위보도대불균균가열유흔호적억제작용，가이확대렬문적검측범위，당빈솔저우12．5 H z시능구청석지식별렬문。결합실험험증료방진결론적정학성，위하일보이용상위신식실현결함적정량검측제공삼고。
T he surface and near surface crack of metallic materials can be detected efficiently and accurately by eddy current thermography .In this paper ,combining with eddy current ther-mography and pulsed phase analysis ,45# steel with surface and subsurface cracks were studied by inductive heating simulation and experiments ,which were aimed to solve the problem of the phase spectrum distribution and the influence of temperature distribution on the phase spec-trum .It shows that ,the phase spectrum distribution has nothing to do with temperature val-ue ,but is closely related to temperature trend .T he phase image has good suppression to inho-mogeneous heating ,and can also broaden the detection range .Crack can be easily detected when frequency is below 12 .5 Hz .The conclusions are experimentally verified ,in order to pro-vide guidance for quantitative crack detection with the phase information in the future study .