Development of Thermographic NDTTechnique Based on Lock-in Measurement of Thermal Wave Response for Structural Integrity Assessment of Aging Aircraft

基于热波响应锁定测量的热成像无损检测技术的发展，用于老化飞机的结构完整性评估

基本信息

批准号：
12555027
负责人：
SAKAGAMI Takahide
金额：
$ 8.26万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The present project developed a new quantitative nondestructive testing (NDT) technique for structural integrity assessment of aging aircrafts. The results obtained are summarized as follows.1. For detecting cracks, singular electrothermal field near crack tips under the application of periodically modulated electric current was measured using lock-in thermography. Experimental investigations were made on the resolution and the applicability in the identification of cracks embedded in steel and aluminum alloy plates. Significant singular electrothermal field was observed at the crack tip in die lock-in thermal image. Location and size of the crack were accurately determined, demonstrating the feasibility of the proposed technique.2. For material loss defects and delamination defects, a thermographic NDT technique based on the lock-in measurement of the surface temperature under periodical heating was developed. Experimental study was made on the applicability to the detection of flat b … More ottom hole defects and delamination defects. In-phase and out-of-phase temperature amplitude images were taken by the lock-in thermography, synchronized to the reference signal of the periodical heating. Further, another thermographic NDT technique based on the transient temperature under the pulse heating was developed. Temperature descent curve which reflects defect parameters such as size, shape and depth of defects was analyzed using Fourier series. Developed techniques were applied to the identification of material loss defects and delamination defects in aerospace structures. It was found that defect parameters can be accurately determined by the developed thermographic NDT techniques.3. Quantitative NDT technique for delamination defects in concrete structures was developed based on the phase delay measurement using a lock-in infrared thermography. Location and size of the defect can be estimated from the contrast change and depth can be estimated from the relationship between phase delay and heating period.4. Passive electric potential CT method was developed as a new monitoring technique. Electric potential distribution measurement on the surface of piezoelectric film glued on the structure was processed by inverse analysis. Less

本项目开发了一种新的定量非破坏性测试（NDT）技术，用于老化飞机的结构完整性评估。获得的结果总结如下1。为了检测裂纹，使用锁定热力计测量了定期调制电流的裂纹尖端附近的奇异电视场。对分辨率和应用在识别钢和铝合金板中嵌入的裂纹中的应用进行了实验研究。在锁定热图像中的裂纹尖端上观察到明显的奇异电热场。准确确定裂纹的位置和大小，证明了提出的技术的可行性2。对于材料损失缺陷和分层缺陷，开发了一种基于定期加热下表面温度锁定测量的热量NDT技术。对检测Flat B的适用性进行了实验研究……更多的OTTOM孔缺陷和分层缺陷。通过锁定热力计拍摄同相和相位温度放大器图像，并同步与周期加热的参考信号。此外，开发了基于脉冲加热下瞬态温度的另一种热量NDT技术。使用傅立叶序列分析了反映缺陷参数（例如大小，形状和深度）的温度下降曲线。开发的技术应用于航空航天结构中材料损失缺陷和分层缺陷的识别。发现缺陷参数可以通过开发的热力学NDT技术准确地确定。3。基于使用锁定红外热摄影的相位延迟测量，开发了混凝土结构中分层缺陷的定量NDT技术。从对比度变化和深度可以根据相延迟和加热期之间的关系估算出缺陷的位置和大小。4。被动电势CT方法是作为一种新的监测技术开发的。通过反分析处理了在结构上粘在结构上的压电膜表面上的电势分布测量。较少的