A quantitative detection method for stress corrosion cracks in turbine discs using a BPSO-RBFNN model

Yang, Xiaoxia; Jia, Lin; Meng, Qingfeng

doi:10.1088/1361-6501/aad468

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…The stress gradually accumulates under the action of external loads during the operation of the basin insulators. When the stress exceeds the mechanical strength, cracks will easily form and lead to air leakage, partial discharge, insulation ablation, and flashover [9,10]. The failure rate of GIS due to the insulation problem reached 69%, in a certain region in China from 2010 to 2018 [11].…”

Section: Introductionmentioning

confidence: 99%

Stress Measurements of GIS Epoxy Composite with Transverse Waves Based on the Ultrasonic Pulse-Echo Method

Zou,

Qiu,

Tian

et al. 2023

Applied Sciences

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The mechanical reliability of the gas-insulated metal-enclosed switchgear (GIS) is critical to the safe and stable operation of a power system. The internal stress induced in GIS insulators, which typically lead to cracking, can degrade the mechanical properties and compromise the reliability of the GIS. In this work, ultrasonic nondestructive measurements of the internal stress in a GIS 126 kV epoxy composite with the transverse waves are demonstrated for the first time. Our results show that the velocities of ultrasonic transverse waves increase linearly with the compressive stress and decrease linearly with the tensile stress. The acoustoelastic coefficients are −1.18 × 10−4/MPa and −1.96 × 10−4/MPa for measurements with transverse waves polarized vertically and parallelly to stress, respectively. Based on these acoustoelastic coefficients, the internal stresses are calculated, and the maximum absolute values of relative errors are 35.4% and 26.3% for measurements with the transverse wave polarized vertically and parallelly to stress, respectively.

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Section: Introductionmentioning

confidence: 99%

Stress Measurements of GIS Epoxy Composite with Transverse Waves Based on the Ultrasonic Pulse-Echo Method

Zou,

Qiu,

Tian

et al. 2023

Applied Sciences

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“…The sound wave propagates in three principal modes that are based on the way the particle oscillates. During the last two decades, there have been many advances in the field of ultrasonic testing [4]. Newer techniques such as time of flight diffraction, phased array ultrasonic testing (PAUT), and guided wave testing, etc, have emerged [5].…”

Section: Introductionmentioning

confidence: 99%

Simulation and experimental analysis of austenitic stainless steel weld joints using ultrasonic phased array

Kumar

Menaka

Venkatraman

2019

Meas. Sci. Technol.

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The phased array ultrasonic technique provides enormous advantages over the conventional ultrasound technique, mostly because of its ability to focus and steer the beam, and its electronic scanning capabilities. Phased array ultrasonic testing of austenitic stainless steel welds is very difficult, due to the presence of coarse or large grains, anisotropic grain structure in the welds and the acoustic impedance mismatch between the base metal and weld metal interface. Due to the influence of these phenomena, it is difficult to analyze the inspection results and to classify the ultrasonic indications. In this paper, two different types of phased array probes (linear array (LA) and dual matrix array (DMA)) are investigated to improve the reliability of ultrasonic testing for austenitic welds. Modelling is used to simulate the propagation of ultrasonic waves in welds using a combination of the approaches of the ray-based model and the semi-analytical model. The optimization of phased array probes (both LA and DMA) for better signal-to-noise ratio and defect detectability has been studied with the help of simulation. The modelling results are validated with experimental results carried out on weld samples. Experiments are carried out on stainless steel weld samples with artificial defects of side drill hole and notches. The experimental ultrasonic images are obtained with linear array probes and dual matrix array probes and were validated with radiographic images. The study reveals that the DMA probe is superior to the LA probe and this is confirmed through the signal-to-noise ratio calculation. The present work clearly indicates that the DMA probe is a promising candidate to evaluate austenitic stainless steel welds.

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Influence of electric charge on numerical simulation of eddy current testing signals due to a conductive crack when using multi-media element

Jomdecha

Chen

2020

AIP Advances

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The multi-media finite element (MME) treating the discontinuity of the conductivity within the element was proposed by authors for fast simulation of the eddy current testing (ECT) signals of a conductive crack such as a stress corrosion crack. However, in the cases when eddy current consists of a large component perpendicular to the crack surface, the simulation accuracy is sometimes not very good because of the appearance of electric charge on the crack surface. In this paper, the influences of the surface electric charge on the implementation of the numerical method and on the simulation of the ECT signals were analyzed theoretically. A series of numerical analyses were designed to investigate the scope of feasibility of the MME. The simulation accuracy of the MME for different probe orientations and crack shapes was discussed based on the analysis of the distribution of the surface charge.

show abstract

A quantitative detection method for stress corrosion cracks in turbine discs using a BPSO-RBFNN model

Cited by 6 publications

References 26 publications

Stress Measurements of GIS Epoxy Composite with Transverse Waves Based on the Ultrasonic Pulse-Echo Method

Stress Measurements of GIS Epoxy Composite with Transverse Waves Based on the Ultrasonic Pulse-Echo Method

Simulation and experimental analysis of austenitic stainless steel weld joints using ultrasonic phased array

Influence of electric charge on numerical simulation of eddy current testing signals due to a conductive crack when using multi-media element

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