International Journal of Applied Electromagnetics and Mechanics - Volume 71, issue S1

Authors: Wang, Li | Chen, Zhenmao

Article Type: Research Article

Abstract: Quantitative nondestructive testing with enough precision are the basis for studying crack propagation behaviour and the residual life of structural component. Eddy current testing (ECT) is a fast nondestructive testing technique with many testing objects. As the common effect of each crack in combined cracks on ECT signals, quantitative detection of combined cracks is a challenge. In this paper, quantitative detection of combined cracks using features of ECT signals and an artificial neural network (ANN) method is proposed. Firstly, a model of combined cracks containing a long crack and a short vertical crack is used to approximately calculate two-dimensional ECT …signals of crack. Secondly, correlation between the parameters of combined cracks and the features of the two-dimensional ECT signals are investigated by numerical simulation. Finally, the crack parameters are evaluated from the simulation signals of combined cracks and the measured signals of stress corrosion cracking using the proposed strategy. Numerical results verify the effectiveness of the proposed strategy. Show more

Keywords: Artificial neural network, combined cracks, eddy current testing, quantitative detection

DOI: 10.3233/JAE-220221

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. S1, pp. S571-S580, 2023

Authors: Łukaszuk, Ryszard | Żwir, Marek J. | Chady, Tomasz

Article Type: Research Article

Abstract: This paper shows an experimental investigation of the steel-made samples using a novel nondestructive testing technique, the Magnetic Recording Method (MRM). The technique is intended to examine stress or fatigue-loaded ferromagnetic structures. First, the material has to be magnetized (e.g. using an array of permanent magnets) to obtain a specific magnetization path with a quasi-sinusoidal shape. Then, remanence is measured and recorded for further analysis. After the operation or static stress load, the measurement is repeated. Analysis of the relative change in magnetization enables applied stress to be identified unequivocally.

Keywords: NDT, nondestructive testing, magnetic recording method. MRM

DOI: 10.3233/JAE-220222

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. S1, pp. S581-S588, 2023

Authors: Gao, Xuan | Chen, Hong-En | Li, Yong | Li, Shuyun | Chen, Hui | Wang, Meng | Yang, Sa | Tian, Shuxia | Chen, Zhenmao

Article Type: Research Article

Abstract: In this paper, inversion schemes for reconstruction of load and constraint of pipeline structure of a liquid rocket engine for global vibration evaluation of pipelines have been proposed and validated. The method involved modeling for forward simulation of random vibration and a multistep inversion scheme to reconstruct the unknown load and constraint parameters. In parallel, a piping structure vibration experimental system was also established to acquire the measured vibration signals for experimental validation of the numerical method. From both the numerical and experimental results, it was verified that a fine finite element model of a pipeline structure can be established …based on the reconstructed load and constraint parameters which enabled a global vibration evaluation of the pipeline structure based on limited vibration information. Show more

Keywords: Pipeline structure, reconstruction schemes, load and constraint, global vibration evaluation

DOI: 10.3233/JAE-220223

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. S1, pp. S589-S597, 2023