Fatigue Assessment of Inclined Film Cooling Holes in Nickel-Based Single-Crystal Superalloy

IF 2.1 3区工程技术 Q2 ENGINEERING, AEROSPACE

AIAA Journal Pub Date : 2024-07-14 DOI:10.2514/1.j064178

Huanbo Weng, Cheng Luo, H. Yuan, Yuanxing Gu

引用次数: 0

Abstract

Fatigue tests of nickel-based single-crystal superalloys with inclined film cooling holes (FCHs) at 1000°C were conducted to investigate the effects of crystal orientation and to quantify the fatigue performance of the high-temperature structures. Fractographic analysis and computations of stress concentrations revealed competitive failure mechanisms between mode I crack nucleation and fatigue crack growth in crystallographic plastic slip systems, whereas crack nucleation around inclined FCHs can be characterized by the known fatigue criteria derived for smooth specimens. A life prediction model based on the crystal slip mechanism and the theory of critical distance was introduced to predict the fatigue life of FCH structures and provided reasonable accuracy for different FCH specimens.

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镍基单晶超级合金斜膜冷却孔的疲劳评估

为了研究晶体取向的影响并量化高温结构的疲劳性能，我们在 1000°C 下对带有倾斜薄膜冷却孔 (FCH) 的镍基单晶超合金进行了疲劳试验。应力集中的断面分析和计算揭示了晶体塑性滑移系统中模式 I 裂纹成核和疲劳裂纹增长之间的竞争性失效机制，而倾斜 FCH 周围的裂纹成核可通过针对光滑试样得出的已知疲劳标准来表征。基于晶体滑移机制和临界距离理论的寿命预测模型被引入到 FCH 结构的疲劳寿命预测中，并为不同的 FCH 试样提供了合理的精度。

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

AIAA Journal 工程技术-工程：宇航

CiteScore

5.60

自引率

12.00%

发文量

458

审稿时长

4.6 months

期刊介绍： This Journal is devoted to the advancement of the science and technology of astronautics and aeronautics through the dissemination of original archival research papers disclosing new theoretical developments and/or experimental results. The topics include aeroacoustics, aerodynamics, combustion, fundamentals of propulsion, fluid mechanics and reacting flows, fundamental aspects of the aerospace environment, hydrodynamics, lasers and associated phenomena, plasmas, research instrumentation and facilities, structural mechanics and materials, optimization, and thermomechanics and thermochemistry. Papers also are sought which review in an intensive manner the results of recent research developments on any of the topics listed above.