| 吴立夫,石文雄,谢惠民*.热障涂层高温失效行为的正射投影-单相机三维数字图像相关实验研究[J].实验力学,2017,32(5):609~619 |
| 热障涂层高温失效行为的正射投影-单相机三维数字图像相关实验研究 |
| Experimental Study of High Temperature Failure Behavior of Thermal Barrier Coating Based on 3D Digital Image Correlation of Single camera |
| 投稿时间：2017-06-13 修订日期：2017-08-16 |
| DOI：10.7520/1001-4888-17-302 |
| 中文关键词: 单相机三维数字图像相关 高温测量 热障涂层 |
| 英文关键词:Single Lens 3D digital image correlation (SL-3D DIC) high temperature measurement thermal barrier coating |
| 基金项目:国家自然科学基金(11672153， 11227801，11232008)资助 |
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| 中文摘要: |
| 热障涂层(Thermal Barrier Coating, TBC)作为一种隔热材料，可降低发动机高温部件的表面温度，提高涡轮发动机的整体性能。涂层服役过程中，TBC陶瓷层的失效将导致高温部件中的金属基底直接暴露于恶劣的高温环境中，严重影响发动机的安全性。其高温服役环境下的力学性能研究是备受材料和力学工作者关注的问题。本文结合热障涂层高温检测的需求，实现了涂层-基底异质表面的高对比度高温散斑制作;发展了正射投影-单相机三维数字图像相关方法(正射投影-单相机3D DIC)，构建了跨界面形函数，实现了涂层与基底的三维形貌及位移、应变的同时测量；基于涂层结构的高温拉伸实验结果，建立了依据涂层-基底应变方差差值的涂层失效判断方法，得到了热障涂层在室温(27℃)至1000℃的断裂极限应变。实验结果表明，正射投影-单相机3D DIC方法作为一种可靠测试方法，可以应用于涂层结构高温下的力学失效行为研究。 |
| 英文摘要: |
| As a thermal insulation material, thermal barrier coating (TBC) can reduce surface temperature of high temperature engine components, therefore improve the overall performance of turbine engine. In the course of TBC service, the failure of its ceramic layer will result in the direct exposure of metal substrate of high temperature components into high temperature environment, which will seriously affect the engine safety. And thus，the study of its mechanical properties in high temperature environment has attracted much attention of material and mechanics researchers. In this paper, according to the requirement of high temperature detection for thermal barrier coating, a manufacture technology of high-temperature speckle with high contrast for coating-substrate heterogeneous surface is proposed. A 3D digital image correlation (3D-DIC) method of single camera was developed; an across-interface shape function was established, which realizes the simultaneous measurement of 3D morphology, displacement and strain of coating and substrate. Based on coating structure high temperature tensile experimental results, a method for judging failure of coating- substrate was established, based on the difference of coating-substrate strain variance，the fracture ultimate strain of thermal barrier coatings was also obtained in a range from room temperature (27℃) to 1000℃. Experimental results show that as a reliable measurement method, 3D digital image correlation method of single camera can be applied to study the mechanical failure behavior of TBC structures at high temperature. |
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