Influence of cyclic-loading induced fatigue micro-crack growth on generation of nonlinear ultrasonic Lamb waves

Fatigue damage and micro-cracks growth have been proved to be closely related to the nonlinear effect of ultrasonic Lamb waves propagation in materials. In this paper, the relationship among fatigue life, length and width of micro-cracks, and the acoustic nonlinearity parameter was established. The...

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Bibliographic Details
Published in:Journal of nondestructive evaluation 2021-09, Vol.40 (3), Article 62
Main Authors: Ding, Taotao, Zhu, Wujun, Ma, Congyun, Xiang, Yanxun, Deng, Mingxi, Xuan, Fu-zhen
Format: Article
Language:English
Subjects:
Acoustic fatigue
Acoustics
Aluminum base alloys
Characterization and Evaluation of Materials
Classical Mechanics
Control
Crack propagation
Cracks
Damage assessment
Dynamical Systems
Engineering
Fatigue cracks
Fatigue failure
Fatigue life
Lamb waves
Metal plates
Microcracks
Mountains
Nonlinearity
Parameters
Solid Mechanics
Vibration
Wave propagation
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Summary:Fatigue damage and micro-cracks growth have been proved to be closely related to the nonlinear effect of ultrasonic Lamb waves propagation in materials. In this paper, the relationship among fatigue life, length and width of micro-cracks, and the acoustic nonlinearity parameter was established. The variation of the acoustic nonlinearity parameter caused by fatigue damage was analyzed based on micro-cracks growth. Considering the multimodal nature of nonlinear Lamb waves, we selected the low-frequency mode pairs S0–s0 and S1–s2 to evaluate fatigue damage in 7075 aluminum alloy plates. Both FE simulations and experiments show that the mode pair S1–s2 is more suitable than S0–s0 for the assessment of fatigue damage. It was found that with increasing fatigue cycles, the relative acoustic nonlinearity parameter A 2 / A 1 2 firstly increases because the micro-cracks length extends while the micro-cracks width does not change much. The relative acoustic nonlinearity parameter A 2 / A 1 2 reaches its peak at about 60% of the fatigue life. Then the relative acoustic nonlinearity parameter A 2 / A 1 2 decreases because of the rapid increase in the micro-cracks width. Our findings clarify the mountain-shape curve between the relative acoustic nonlinearity parameter A 2 / A 1 2 and the fatigue cycles.
ISSN:0195-9298
1573-4862
DOI:10.1007/s10921-021-00792-8