Damage detection in circular cylindrical shells using active thermography and 2-D discrete wavelet analysis

Parrany, Ahmad Mahdian

doi:10.1016/j.tws.2018.12.028

Cited by 15 publications

(3 citation statements)

References 20 publications

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“…IRT is a non‐destructive test method which detects infrared energy emitted from an object, changes it to temperature, [ 36,37 ] and shows an image of temperature distribution. [ 38 ] Passive IRT is used in this study to record the temperature of the sample during the mechanical testing. [ 39 ] Surface temperature distribution of the specimen is recorded during the test with an infrared camera (FLIR X6580sc) containing 50 mm lens which is placed at ~70 cm away from the tensile test specimen.…”

Section: Experimental Setup and Numerical Modelingmentioning

confidence: 99%

Strength prediction and experimental damage investigations of plain woven CFRPs with interacting holes using multi‐instrument measurements

et al. 2023

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Composite structures with holes have been utilized in different applications, for example, swash plates, adaptor plates, and repair patches. These notches reduce the structural performance of the composite plates. In a woven composite plate with two interacting holes, the orientation of the holes affects the stress concentration factor (SCF) and strength of the laminate. The SCF determined by finite‐element method (FEM) shows that the structural performance of the sample with a single hole is improved through drilling one more hole along the loading direction. The main purpose of this article is to investigate, numerically and experimentally, the interaction between two holes, oriented at different angles, when the plate is subjected to tension. The location of the critical region depends on the configuration of the holes. The critical region and characteristic distances are established for each sample combining the FEM and digital image correlation (DIC) techniques. Point stress criterion (PSC) and extended‐PSC (EPSC) methods are utilized to predict the final failure strength of specimens. The failure progression under the influence of interaction between the two holes is investigated by infrared thermography (IRT). Moreover, to complement the IRT and mechanical results, fractographic analysis is conducted and it is concluded that a delamination dominated fracture along loading direction takes place in samples with two holes while a transversal matrix dominated failure is observed for the single notch specimen.

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Section: Experimental Setup and Numerical Modelingmentioning

confidence: 99%

Strength prediction and experimental damage investigations of plain woven CFRPs with interacting holes using multi‐instrument measurements

et al. 2023

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“…Ahmad et al [75] proposed the detection of damage to the cylindrical shell using DWT analysis in a post-processing technique based on active IRT as one of the NDT. ABAQUS simulation was used to analyze the transient heat transfer problem of the damaged doublesided shell.…”

Section: Advances Of Dwtmentioning

confidence: 99%

Latest Advances in Common Signal Processing of Pulsed Thermography for Enhanced Detectability: A Review

2021

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Non-destructive testing (NDT) is a broad group of testing and analysis techniques used in science and industry to evaluate the properties of a material, structure, or system for characteristic defects and discontinuities without causing damage. Recently, infrared thermography is one of the most promising technologies as it can inspect a large area quickly using a non-contact and non-destructive method. Moreover, thermography testing has proved to be a valuable approach for non-destructive testing and evaluation of structural stability of materials. Pulsed thermography is one of the active thermography technologies that utilizes external energy heating. However, due to the non-uniform heating, lateral heat diffusion, environmental noise, and limited parameters of the thermal imaging system, there are some difficulties in detecting and characterizing defects. In order to improve this limitation, various signal processing techniques have been developed through many previous studies. This review presents the latest advances and exhaustive summary of representative signal processing techniques used in pulsed thermography according to physical principles and thermal excitation sources. First, the basic concept of infrared thermography non-destructive testing is introduced. Next, the principle of conventional pulsed thermography and signal processing technologies for non-destructive testing are reviewed. Then, we review advances and recent advances in each signal processing. Finally, the latest research trends are reviewed.

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“…The traditional approach of structural assessment involves periodic manual inspection which is time-consuming, labour intensive, and highly dependent on the inspector's level of knowledge, skill, and experience [3][4][5]. On the other hand, in recent years, many researchers have demonstrated the efficacy of image processing techniques in order to study various physical phenomena more accurately [6][7][8][9]. Therefore, due to the mentioned drawbacks, automatic crack detection using image and video processing has received a lot of attention in order to develop a faster and more efficient way of crack assessment in civil and mechanical engineering structures.…”

Section: Introductionmentioning

confidence: 99%

A new image processing strategy for surface crack identification in building structures under non‐uniform illumination

Parrany

Mehrara

2021

IET Image Processing

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Crack detection in building structures is an important approach to evaluating the safety of these structures. However, in some cases under special circumstances, it is very difficult to identify all features of cracks by visual inspection. To tackle this problem and offer a higher potential for practical implementations, developing an automatic crack detection method seems essential. This paper establishes a novel algorithm for surface crack detection in building walls based on image processing techniques to enhance crack visibility. One of the most prevalent issues in surface crack detection from digital crack images is non-uniform illumination of background which makes narrow and tiny cracks indistinguishable. In this regard, an integrated approach, combining adaptive image threshold using local first-order statistics, contrast-limited adaptive histogram equalization, and noise filtering using nonlinear diffusion filtering, is proposed to extract the whole skeleton of the crack from digital crack images with non-uniform illumination. Several realistic crack images, suffering from noise and uneven lighting of background, are processed through the proposed algorithm to demonstrate the robustness and high accuracy of the method.

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Damage detection in circular cylindrical shells using active thermography and 2-D discrete wavelet analysis

Cited by 15 publications

References 20 publications

Strength prediction and experimental damage investigations of plain woven CFRPs with interacting holes using multi‐instrument measurements

Strength prediction and experimental damage investigations of plain woven CFRPs with interacting holes using multi‐instrument measurements

Latest Advances in Common Signal Processing of Pulsed Thermography for Enhanced Detectability: A Review

A new image processing strategy for surface crack identification in building structures under non‐uniform illumination

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