Scanning laser in-depth heating infrared thermography for deep debonding of glass curtain walls structural adhesive

Lin, Jinfan; Hong, Xiaobin; Ren, Zeming; Chen, Junhao

doi:10.1016/j.measurement.2022.110902

Cited by 12 publications

(4 citation statements)

References 34 publications

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“…In this numerical example, the change of temperature field is simply considered, and the single crystal silicon wafer is heated by a laser probe [ 64 , 65 ]. The heating process is divided into two cases.…”

Section: Three Dimensional (3d) Dynamic Thermal-mechanical Coupling M...mentioning

confidence: 99%

A Dynamic Thermal-Mechanical Coupling Numerical Model to Solve the Deformation and Thermal Diffusion of Plates

2022

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Elastic materials include metal plates, rubber, foam, airbags and so on, which have a good buffer effect, toughness and strong recovery ability. In this paper, the deformation and thermal diffusion of 2D and 3D thin plates are studied. Two models are established for the deformation of 2D thin plates. The bending deformation equation of rectangular and circular plates is derived, and the semi-analytical solution of the deflection function w(x,y) is found through the Fourier series approximation in the polar coordinate. The consistencies of the numerical solution and the theoretical solution are verified by numerical method. Then, we find that the factors affecting the deformation are related to the Young’s modulus, load, plate length and deformation factor α of the material. In a separate temperature physics field, we establish a heat conduction model of 2D graphene film. Three numerical schemes of the transient heat conduction equation of FDM-FEM are given. In contrast, this paper uses the implicit Euler method to discrete the time term. Furthermore, we compared the difference between the adiabatic condition and the convection condition by the graphical method and the curve trend. The results show that the temperature near the adiabatic boundary is higher. Finally, we proposed a 3D dynamic thermal–mechanical coupling model (3D-DTMCM) that has been established. A laser heating monocrystalline silicon sheet with periodic motion formula is given. The temperature radiation of the laser heat source has Gaussian distribution characteristics. Our proposed model can dynamically determine Young’s modulus with a variable temperature. The numerical results show that the higher the temperature is, the higher the strain energy density of the plate is. In addition, the deformation amplitude of the plates in the coupling field is larger than that in the single mechanical field. Finally, we also discussed the stress field distribution of mixed cracks under high temperature and high load. Our research provides theoretical support for the deformation of different plates, and also reflects the value of the coupled model in practical applications.

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Section: Three Dimensional (3d) Dynamic Thermal-mechanical Coupling M...mentioning

confidence: 99%

A Dynamic Thermal-Mechanical Coupling Numerical Model to Solve the Deformation and Thermal Diffusion of Plates

2022

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“…In recent years, with the wide application of curtain walls [6] , the maintenance of curtain walls has become more and more important. Lin et al [7] proposed an infrared thermography method based on scanning laser depth heating, which can effectively detect the defective problems of structural adhesive of glass curtain wall; Xu et al [8] proposed a deformation monitoring method of glass curtain wall based on fiber optic sensing technology. These methods require external detection equipment and have high detection costs.…”

Section: Introductionmentioning

confidence: 99%

A building curtain wall security inspection system based on terahertz wave imaging

Gao,

Cao

2024

International Conference on Frontiers of Applied Optics and Computer Engineering (AOCE 2024)

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A non-destructive security inspection system for building curtain walls based on millimeter wave imaging was designed to address the difficulty in detecting internal components of building curtain walls. This system is based on the principle of active millimeter wave imaging, which can scan the components inside the curtain wall and image them in the upper computer. It mainly includes a terahertz wave irradiation source and receiver, as well as a point-to-point imaging system consisting of a pair of 90 ° off axis parabolic mirrors and a semi-transparent and semi-reflective mirror. In order to simplify the system structure, a scheme of transmitting echoes along the same path is proposed. This scheme has a simple structure and can effectively solve the problem of the echo signal being affected by the reflected waves generated by the upper and lower surfaces of the curtain wall and the oscillating reflected waves generated between the lower surface of the curtain wall and the metal components during the process of millimeter wave penetration through the curtain wall. It can also achieve point-to-point clear imaging with an imaging accuracy of approximately 3 mm.

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“…In recent years, with the wide application of curtain walls [1], the maintenance of curtain walls has become more and more important. Lin et al [2] proposed an infrared thermography method based on scanning laser depth heating, which can effectively detect the defective problems of structural adhesive in glass curtain walls; Xu et al [3] proposed a deformation monitoring method for glass curtain walls based on fiber optic sensing technology. Traditional metal pendant detection methods are mainly based on visual inspection and external equipment detection technology, but these methods have many shortcomings.…”

Section: Introductionmentioning

confidence: 99%

Research on Non-Destructive Testing of Curtain Wall Hangings Based on Efficient Channel Attention Vision Transformer Network

Gao,

Cao

2024

IEEE Access

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Traditional inspection of curtain wall metal hangings usually relies on manual visual inspection, which is costly, slow, and limited in coverage. To reduce cost and improve efficiency and accuracy, a nondestructive automatic inspection system for architectural curtain walls based on millimeter wave imaging was designed. The system is designed as a single-side reflective point-frequency imaging, which can effectively solve the problem of reflective waves generated on the upper and lower surfaces of the curtain wall during millimeter-wave penetration affecting the echo signal. To address the fine-grained classification problem of metal hangings, we propose an efficient channel attention Vision Transformer (ECA-ViT) lightweight classification network based on a hybrid architecture of convolutional neural network and Transformer. Among them, the inverted residual attention module (IRAM) improves the network's attention weight on the image foreground, and the low-rank MobileViT module (LR-ViT) can provide global modeling for the network and making the whole model more lightweight by reducing the computational complexity of the self-attention mechanism. The experimental results demonstrate that the proposed method achieves an accuracy of 95.66% with fewer model parameters and computational complexity, demonstrating good performance advantages.

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Scanning laser in-depth heating infrared thermography for deep debonding of glass curtain walls structural adhesive

Cited by 12 publications

References 34 publications

A Dynamic Thermal-Mechanical Coupling Numerical Model to Solve the Deformation and Thermal Diffusion of Plates

A Dynamic Thermal-Mechanical Coupling Numerical Model to Solve the Deformation and Thermal Diffusion of Plates

A building curtain wall security inspection system based on terahertz wave imaging

Research on Non-Destructive Testing of Curtain Wall Hangings Based on Efficient Channel Attention Vision Transformer Network

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