Mr. Shengming Cui Profile

Shengming Cui

at 南京航空航天大学

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Proceedings Article | 9 January 2023 Paper

FBG sensing detection of composite hidden multi-delamination

Shengming Cui, Jiyun Lu, Yiyao Wang, Zifan He

Proceedings Volume 12507, 1250706 (2023) https://doi.org/10.1117/12.2653240

KEYWORDS: Fiber Bragg gratings, Composites, Sensing systems, Sensors, Clouds, Carbon, Wavelets, Wavelet transforms, Wave propagation, Refractive index

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Multi-damage detection for composite materials has been a hot issue in the field of structural health monitoring. In order to further study the problem by means of FBG sensors, an optical fiber sensing system has been built to enable the detection of delamination damage in composite laminates. The system includes sensing strain, data processing and damage localization algorithms. A model of a carbon fiber/epoxy laminate is created using the finite element analysis. The stress cloud chart of the laminate when subjected to a hammering load is calculated and analyzed and it is concluded that stress waves propagate along 45 degree direction of carbon fiber and stress is concentrated at the delamination and then decreased obviously. The Fourier transform and wavelet transform are used to analyse the key level signal of the wavelet transform and to determine the area of delamination damage, and the experiment is checked by ultrasonic C-scan. The experimental results show that by building a network of fibre Bragg gratings(FBG) sensing systems, the hammering test can detect multi-delamination damages of different sizes in composite laminates, the smallest of which is 10mm in diameter, providing a basis for subsequent composite structures health monitoring in complex environments.

Proceedings Article | 9 January 2023 Paper

Damage propagation prediction of composite joint under tensile loading and experimental verification using FBG sensors

Zifan He, Jiyun Lu, Shengming Cui, Hongfu Zuo

Proceedings Volume 12507, 1250704 (2023) https://doi.org/10.1117/12.2653207

KEYWORDS: Composites, Fiber Bragg gratings, Sensors, Adhesives, Interfaces, 3D modeling

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Composite joint plays a significant role in the composite sandwich structural connection. However, its complex structure and environmental conditions can lead to difficulties in real-time monitoring. Regarding this, a threedimensional finite element simulation model has been developed for the prediction, propagation and improvement of adhesion failure in an adhesively bonded laminated structure. In this study, a tensile fracture monitoring test under fiber Bragg grating-based monitoring was designed using the Fiber Bragg Grating (FBG) sensors. The simulation, based on the cohesive zone method with Hashin, Chang-Chang, Hou criteria and the mixed criteria, also indicates that debonding of the filler area was the main failure behavior of this composite joint. Using the finite element simulation model based on mixed criterion, the predicted initial and final failure loads have a good agreement with experiments, and the effects of the FBG sensors layout were investigated and discussed on Acquisition and processing of failure signals of composite joint. The findings in this work are helpful to improve mechanical behaviour of composite joint and improve the FBG monitoring to meet the high criteria of the aerospace industry.

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