Monitoring of fatigue crack under complex environment using guided waves

Jianfei Tang; Gang Yan; Xiwu Xu

doi:10.1117/12.923212

12 April 2012 Monitoring of fatigue crack under complex environment using guided waves

Jianfei Tang, Gang Yan, Xiwu Xu

Proceedings Volume 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering; 84092R (2012) https://doi.org/10.1117/12.923212
Event: Third International Conference on Smart Materials and Nanotechnology in Engineering, 2011, Shenzhen, China

Abstract

This paper presents an experimental study on monitoring of fatigue crack under complex environment using guided waves. An experimental set-up consisting of an electrical oven, a MTS testing machine and a monitoring system is established to perform the study. First, the combined effects of temperature, load and vibration on the propagation of guided waves in metallic structure is studied. Then, a statistical approach is proposed to detect fatigue crack under these combined effects. Damage feature is extracted after the guided wave signals are processed by Fourier transform. A Monte Carlo procedure is employed to estimate the probability density functions of the feature before and after cracking, respectively. By comparing the probability density functions, the probability of existence of fatigue crack is determined. Experimental study on a fatigue coupon under combined effects of temperature, load and vibration is conducted to demonstrate the effectiveness of the proposed method.

Citation Download Citation

Jianfei Tang, Gang Yan, and Xiwu Xu "Monitoring of fatigue crack under complex environment using guided waves", Proc. SPIE 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering, 84092R (12 April 2012); https://doi.org/10.1117/12.923212

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