Fatigue crack closure assessment by wavelet transform of infrared thermography signals

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2024-10-05 DOI:10.1016/j.ijfatigue.2024.108639

Lorenzo Bercelli, Bruno Levieil, Cédric Doudard, Sylvain Calloch

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Abstract

The occurrence of crack closure significantly impacts the fatigue life of materials and structural components. Whether it is induced by the nature of the loading, the fabrication process or the geometry of the structure, its magnitude and effect should be considered to further improve predictive models of fatigue crack propagation. However, the definition of reliable experimental methods for the observation and assessment of fatigue crack closure, and in particular suited to structure testing, remains a challenge. The present study aims to provide a novel approach for the assessment of fatigue crack closure via the continuous wavelet transform of infrared thermography data. The processing of the temperature signal close to the crack in a coherent time–frequency space allows for the identification of crack closing and opening instants associated with high-frequency components. The method is meant to be suited to any testing configuration (conventional compact tension specimen or full-scale structures) with minimum operator-dependent parameters.

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利用红外热成像信号的小波变换评估疲劳裂纹闭合情况

裂纹闭合的发生会对材料和结构部件的疲劳寿命产生重大影响。无论是由载荷性质、制造工艺还是结构的几何形状引起的裂纹闭合，都应考虑其程度和影响，以进一步改进疲劳裂纹扩展的预测模型。然而，如何确定观察和评估疲劳裂纹闭合的可靠实验方法，特别是适合结构测试的方法，仍然是一项挑战。本研究旨在通过红外热成像数据的连续小波变换，提供一种评估疲劳裂纹闭合的新方法。在相干时频空间中处理裂纹附近的温度信号，可识别与高频成分相关的裂纹闭合和打开瞬间。该方法适用于任何测试配置（传统的紧凑型拉伸试样或全尺寸结构），只需最小的操作员相关参数。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.