基于表面声波非线性混频的非接触疲劳裂纹检测

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-08-12 DOI:10.1016/j.ijfatigue.2025.109215

Tam Van Huynh , Santhakumar Sampath , Liu Yang , Hoon Sohn

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引用次数: 0

摘要

疲劳裂纹的存在对在宏观裂纹形成之前早期检测结构缺陷提出了重大挑战。本研究采用全非接触的激励和传感方法，探讨了利用声学非线性参数对铝材疲劳损伤进行早期评估和定位的可行性。该方法是基于两束激光在两个频率fa和fbfa>；fb下对两个窄带表面声波（saw）的样品激发。基于激光的表面声波（SAW）技术，利用微透镜阵列，产生了两个不同的、反向传播的窄带SAW，波长分别为300µm和500µm，对应频率分别为9.84 MHz和5.86 MHz。利用激光多普勒测振仪监测了这些共线传播的反向波在不同疲劳水平下的非线性相互作用。随后，利用这些共线反传播saw的相互作用来评估不同损伤水平下的疲劳裂纹。微裂纹的存在显著地增加了材料的非线性，导致二次分量的振幅更高(例如。， 2fa,2fb,fa±fa)。研究结果证明了疲劳裂纹早期检测和裂纹定位的高空间分辨率的可行性。

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Noncontact fatigue crack detection using non-linear frequency mixing of surface acoustic waves

The presence of fatigue cracks poses a significant challenge to the early detection of structural defects, prior to the formation of macro-cracks. This study investigates the feasibility of using acoustic nonlinearity parameters for the early evaluation and localization of fatigue damage in aluminum, employing a fully non-contact method for both excitation and sensing. The method is based on the sample excitation of two narrowband surface acoustic waves (SAWs) by two laser beams at two frequencies

f_{a}

and

f_{b} (f_{a} > f_{b})

. A laser-based surface acoustic wave (SAW) technique, utilizing micro-lens arrays, was used to generate two distinct, counter-propagating narrowband SAWs with wavelengths of 300 µm and 500 µm, corresponding to frequencies of 9.84 MHz and 5.86 MHz, respectively. The nonlinear interaction of these collinearly propagating counter-directed waves was monitored using a Laser Doppler Vibrometer across various fatigue levels. Subsequently, the interaction of these collinearly counter-propagating SAWs was employed to assess fatigue cracks at various damage levels. The presence of micro-cracks significantly increased material nonlinearity, leading to higher amplitudes of the quadratic components (eg.,

2 f_{a}, 2 f_{b}, f_{a} \pm f_{a}

) observed in the mixed acoustic signal. The results of this study demonstrate the feasibility of an early fatigue crack detection and achieving high spatial resolution for crack localization.

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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.