Quantitative evaluation of fatigue cracks on compressor blades using laser ultrasonic technology under high-temperature conditions

IF 4.1 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Ndt & E International Pub Date : 2025-03-28 DOI:10.1016/j.ndteint.2025.103402

Jiajian Meng , Enpei Zhao , Xianke Li , Kunyi Liao , Junrong Li , Haomiao Fang , Qiang Han , Shuangwei Ma , Hongwei Zhao , Jianhai Zhang

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引用次数: 0

Abstract

Turbine blades in aero-engine compressors are frequently exposed to high temperatures and harsh conditions, making them highly susceptible to surface fatigue cracks and even the risk of induced fracture. In this paper, an online monitoring and quantitative assessment method for fatigue cracks in turbine blades under high-temperature environments are developed, utilizing laser ultrasonic technology. It is crucial to recognize that the propagation characteristics of ultrasonic waves in turbine blades with variable curvature remain unclear. To investigate this, two-dimensional curved surface simulation models are constructed using finite element analysis to simulate the propagation of ultrasonic waves in turbine blades with surface cracks. Numerical simulations demonstrate that surface waves excited by pulsed laser sources propagate without significant hindrance in curved structures, showing notable sensitivity to both longitudinal and transverse crack expansions. Thus, the surface wave transmission method is proposed to evaluate crack characteristics. By leveraging the established laser ultrasonic detection system, transmitted surface waves through cracks of varying sizes are captured with high precision. The excellent consistency with finite element simulation results validates the accuracy of experimental measurements. Fitting functions are derived by integrating simulation computations and experimental results to quantitatively evaluate crack depths and widths at 25 °C. In particular, the quantitative assessment of crack sizes at 300 °C is addressed by incorporating high-temperature attenuation coefficient. In addition, laser ultrasonic technology is employed for online monitoring of fatigue evolution damage at 25 °C and 600 °C, validating the effectiveness of the surface wave transmission method. The proposed technology is essential for in-situ monitoring of surface fatigue damage in operational blades under high-temperature conditions.

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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.