Exact Localization of Debonding Defects in Thermal Barrier Coatings
Exact Localization of Debonding Defects in Thermal Barrier Coatings
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DOI：
10.2514/1.j056806
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发表时间：
2018-07
期刊：
影响因子：
2.5
通讯作者：
Dacheng Jiao;Zhanwei Liu;Wenying Zhu;H. Xie
中科院分区：
文献类型：
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作者：
Dacheng Jiao;Zhanwei Liu;Wenying Zhu;H. Xie
热障涂层脱粘缺陷的存在是导致叶片早期失效的关键问题之一。本文提出了一种线热源扫描热像法对未涂热障涂层叶片进行缺陷定位的方法。与平面试件相比，由于叶片的形状复杂，叶片表面吸收的热量不均匀，使得采用线热源时，叶片表面的温度分布不均匀是不可避免的问题。这种不均匀性遮蔽了缺陷的热响应特征，并干扰了缺陷的识别。所开发的窗口平均载波后处理算法可以解决这个问题，实现无损检测的剥离。除了检测缺陷，投影红外条纹的方法被开发来重建的三维形貌的叶片表面的表面形貌调制和表面高度之间的关系进行分析。...
The existence of debonding defects in thermal barrier coatings is one of the key problems that result in the premature failure of blades. In this paper, a line heat-source scanning thermography method for locating the defects in blades with unpainted thermal barrier coatings is developed. Compared with planar specimens, uneven temperature distribution in the blade surface is an unavoidable problem when using a line heat source because the complex shape of the blade makes the heat absorbed nonuniform. This unevenness shields the thermal response features of the defects and disturbs the identification of the defects. The developed window-averaged carrier postprocessing algorithm can solve this problem to achieve nondestructive testing of debondings. Apart from inspecting defects, a projected infrared fringe method is developed to reconstruct the three-dimensional morphology of the blade surface by analyzing the relationship between the temperature fringes modulated by surface morphology and surface height. ...