A Novel Method to In-Situ Characterize Fatigue Crack Growth Behavior of Nickel-Based Superalloys By Laser Thermography

IF 2 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Experimental Mechanics Pub Date : 2024-10-03 DOI:10.1007/s11340-024-01113-6

C. Geng, Q. Zhong, H. Luo, W. Shi, H. Xie, W. He

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Abstract

Background

Nickel-based superalloys are key materials for aero-engine hot-end components, and fatigue is one of their most typical failure forms. In the field of fatigue research, in-situ characterization of crack growth behavior is crucial, and more intuitive and accurate characterization methods need to be developed.

Objective

In this work, to better understand their fatigue crack growth behavior, we have developed new methods for in-situ characterization of crack growth behavior using laser thermography detection technique.

Methods

According to the thermal images of sample surfaces captured during the fatigue process, a method for positioning crack tip based on Prewitt edge detection is proposed, and a novel parameter, i.e., the crack opening temperature gradient (COTG), is defined to evaluate the crack closure effect.

Results

Based on the variation characteristics of COTG with load rate, the crack initial opening load rate (CIOLR) and crack opening load ratio (COLR) can be determined under different fatigue cycles. The results show that CIOTG and COTG tend to decrease with increasing fatigue cycles.

Conclusion

This work provides a visual and quantitative in-situ method for crack detection and characterization of the crack closure effect in fatigue testing.

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一种原位表征镍基高温合金疲劳裂纹扩展行为的激光热成像新方法

镍基高温合金是航空发动机热端部件的关键材料，疲劳是其最典型的失效形式之一。在疲劳研究领域，裂纹扩展行为的原位表征至关重要，需要开发更直观、更准确的表征方法。目的为了更好地了解其疲劳裂纹扩展行为，我们开发了激光热成像检测技术来原位表征裂纹扩展行为的新方法。方法根据疲劳过程中采集的试样表面热图像，提出了一种基于Prewitt边缘检测的裂纹尖端定位方法，并定义了裂纹开启温度梯度（COTG）作为评价裂纹闭合效果的新参数。结果根据COTG随载荷率的变化特征，可以确定不同疲劳循环下的裂纹初始张开载荷率（CIOLR）和裂纹张开载荷比（COLR）。结果表明：随着疲劳循环次数的增加，复合材料的总疲劳载荷和总疲劳载荷呈降低趋势；结论本工作为疲劳试验中裂纹检测和裂纹闭合效应表征提供了一种可视化、定量的原位方法。

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来源期刊

Experimental Mechanics 物理-材料科学：表征与测试

CiteScore

4.40

自引率

16.70%

发文量

111

审稿时长

3 months

期刊介绍： Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome. Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.