Influence of Specimen Thickness on Fatigue Crack Growth at High Temperature Under Mixed-Mode Loading

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-03-03 DOI:10.1111/ffe.14587

Chun Hu, Xin Huang, Shaolin Li, Hongyu Qi, Xiaoguang Yang, Duoqi Shi

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引用次数: 0

Abstract

The high-temperature components of aeroengines operate under high-temperature and fatigue-loading conditions, resulting in complex crack-related issues. This study presents fatigue crack growth (FCG) experiments under mixed-mode loading performed on compact tension shear specimens fabricated from a nickel-based superalloy, tested at 550°C under varying thicknesses. The influence of specimen thickness on FCG behavior under mixed-mode loading was analyzed through experimental investigations and finite element method simulations. The expanded FCG model, incorporating thickness effects based on closure theory, enables more precise predictions of crack growth rates under mixed-mode loading conditions. Additionally, the FCG da/dN − ΔK curve for nickel-based superalloys exhibits a vertical shift with varying specimen thickness, while the FCG angle under mixed-mode loading remains unaffected by thickness. These findings provide valuable insights for improving damage tolerance design in aircraft engines.

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混合模式载荷下试样厚度对高温疲劳裂纹扩展的影响

航空发动机的高温部件在高温和疲劳载荷条件下工作，产生了复杂的裂纹相关问题。本研究介绍了混合模式加载下的疲劳裂纹扩展（FCG）实验，实验对象是由镍基高温合金制成的致密拉伸剪切试样，在550°C下进行了不同厚度的测试。通过试验研究和有限元模拟，分析了试件厚度对混合模式加载下FCG性能的影响。扩展的FCG模型结合了基于闭合理论的厚度效应，能够更精确地预测混合模式加载条件下的裂纹扩展速率。此外，镍基高温合金的FCG da/dN−ΔK曲线随试样厚度的变化呈现垂直位移，而混合模式加载下的FCG角不受厚度的影响。这些发现为改进飞机发动机的损伤容限设计提供了有价值的见解。

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

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.