Self-Sensing Nonlinear Ultrasonic Fatigue Crack Detection under Temperature Variation †

Sensors

Yun-Kyu An¹  Keunyoung Jang¹  Namgyu Kim² 

[1] Department of Architectural Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea;Department of Civil and Environmental Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea;

关键词: fatigue crack detection;    ultrasonic nonlinearity;    self-sensing;    linear and nonlinear parameters;    temperature variation;    structural health monitoring;    nondestructive evaluation;   

DOI  :  10.3390/s18082527

来源: DOAJ

【 摘 要 】

This paper proposes a self-sensing nonlinear ultrasonic technique for fatigue crack detection under temperature variations. Fatigue cracks are identified from linear (α) and nonlinear (β) ultrasonic parameters recorded by a self-sensing piezoelectric transducer (PZT). The self-sensing PZT scheme minimizes the data acquisition system’s inherent nonlinearity, which often prevents the identification of fatigue cracks. Also, temperature-dependent false alarms are prevented based on the different behaviors of α and β. The proposed technique was numerically pre-validated with finite element method simulations to confirm the trends of α and β with changing temperature, and then was experimentally validated using an aluminum plate with an artificially induced fatigue crack. These validation tests reveal that fatigue cracks can be detected successfully in realistic conditions of unpredictable temperature and that positive false alarms of 0.12% occur.

【 授权许可】

Unknown