镍基单晶涡轮叶片不规则薄膜冷却孔结构的疲劳断裂机理和寿命评估

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2024-09-21 DOI:10.1016/j.engfracmech.2024.110506

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引用次数: 0

摘要

气膜冷却孔是镍基单晶冷却涡轮叶片的主要冷却结构。为评估不规则气膜孔的低循环疲劳寿命，本研究设计了九种带有不同形状不规则气膜冷却孔的镍基单晶平板试件。在高温（850 ℃）下进行了疲劳试验，并详细分析了样品的多尺度断裂机制。根据晶体塑性理论，采用有限元方法分析了不规则薄膜冷却孔周围的应力应变场。提出了基于 Coffin-Manson-Basquin 公式、最大主应变和晶体塑性理论的三种寿命预测模型，用于预测不规则膜冷孔结构的疲劳寿命。预测结果均在双误差带内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

$Fatigue fracture mechanism and life assessment for irregular film cooling hole structures in Ni-based single crystal turbine blades$

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Fatigue fracture mechanism and life assessment for irregular film cooling hole structures in Ni-based single crystal turbine blades

Film cooling holes are the main cooling structures in nickel-based single-crystal cooling turbine blades. To evaluate the low-cycle fatigue life of irregular gas film holes, nine types of Ni-based single-crystal flat-plate test pieces with irregular film cooling holes of different shapes were designed in this study. Fatigue tests were performed at high temperature (850 ℃) and the multiscale fracture mechanisms of the samples analyzed in detail. The stress–strain field around the irregular film cooling holes was analyzed based on crystal plasticity theory using the finite element method. Three life prediction models based on the Coffin–Manson–Basquin formula, maximum principal strain, and crystal plasticity theory were proposed to predict the fatigue life of irregular film-cooled pore structures. The predicted results are all within the double-error band.

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.