Parametric Fabrication Technique of High-Temperature Speckle Based on Femtosecond Laser

IF 1.9 4区 工程技术 Q3 ENGINEERING, MECHANICAL
C. Shi, S. Lan, J. Li, C. Chen, Q. Fang, Y. Ren, B. Liu, W. He, H. Xie
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引用次数: 0

Abstract

The service environment of many core components, such as aero-engine blades, tends toward extreme. Characterization of fatigue failure behavior at high-temperatures is an important means of evaluating their structural integrity, in which digital image correlation (DIC) method shows great potential and advantages due to its full-field, noncontact, and high-temperature compatibility. For high-temperature DIC, its accuracy highly depends on the quality of high-temperature speckle, i.e., deformation carrier or sensor, fabricated on specimen surface. Herein, a parametric high-temperature speckle fabrication technique combining high-temperature dual-layer coating and femtosecond laser etching is developed. The heat-resistant black matte paint and white boron nitride paint are successively coated on the specimen surface, then femtosecond laser is used to etch the coated layer, realizing the parametric non-destructive fabrication. Based on high-throughput design and high-temperature static test, the speckle parameters and fabrication processes are optimized. The fabrication quality of optimized speckles is further verified by charactering fatigue crack propagation behavior of nickel-based superalloy GH4169 at 650℃. The speckle maintains good quality without ablative erosion, showing the advantages of parameterization, automation, high quality, and strong universality/repeatability.

基于飞秒激光的高温散斑参数化制备技术
航空发动机叶片等许多核心部件的使用环境趋于极端化。高温疲劳破坏行为表征是评价材料结构完整性的重要手段,其中数字图像相关(DIC)方法以其全场、非接触、高温相容性等优点显示出巨大的潜力和优势。对于高温DIC,其精度在很大程度上取决于在试样表面制备的高温散斑(即变形载体或传感器)的质量。本文提出了高温双层涂层与飞秒激光刻蚀相结合的参数化高温散斑制备技术。在试样表面依次涂覆耐热黑色哑光漆和白色氮化硼漆,然后利用飞秒激光对涂层进行刻蚀,实现了参数化无损加工。基于高通量设计和高温静态测试,优化了散斑参数和制备工艺。通过对GH4169镍基高温合金650℃疲劳裂纹扩展行为的表征,进一步验证了优化后散斑的制备质量。斑点保持良好的质量,无烧蚀侵蚀,具有参数化、自动化、质量高、通用性/重复性强等优点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Experimental Techniques
Experimental Techniques 工程技术-材料科学:表征与测试
CiteScore
3.50
自引率
6.20%
发文量
88
审稿时长
5.2 months
期刊介绍: Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.
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