Image processing based quantitative damage evaluation in composites with long pulse thermography

Wang, Zijun; Tian, Gui Yun; Meo, Michele; Ciampa, Francesco

doi:10.1016/j.ndteint.2018.07.004

Cited by 112 publications

(42 citation statements)

References 41 publications

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“…Active IR-thermographic methods such as cooling down thermography (CDT) [5] or long pulsed thermography (LPT) [6,7] give satisfactory results for similar defects in composites. In this paper, PT thermography in the range of long pulses is explored, even that heat accumulation phenomenon may occur for subsurface defects.…”

Section: Introductionmentioning

confidence: 99%

Advanced NDT Methods and Data Processing on Industrial CFRP Components

et al. 2019

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In this work, enhanced thermal data processing is developed with experimental procedures, improving visualization algorithm for sub-surface defect detection on industrial composites. These materials are prone to successful infrared nondestructive investigation analyses, since defects are easily characterized by temperature response under thermal pulses with reliable results. Better defect characterization is achieved analyzing data with refined processing and experimental procedures, providing detailed contrasts maps where defects are better distinguished. Thermal data are analyzed for different CFRP specimens with artificial defects and experimental procedures are verified on real structural aeronautical component with internal anomalies due to impact simulation. A better computation method is found to be useful for simultaneous defect detection by means of automatic mapping of absolute contrast, optimized to identify defect boundaries.

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Section: Introductionmentioning

confidence: 99%

Advanced NDT Methods and Data Processing on Industrial CFRP Components

et al. 2019

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“…Although a moderately shallow defect can be detected using IRT after exposure to intensive heat over a short period of time, previous studies have shown that flash thermography for IR inspection is effective for defect detection in thin structural members (e.g. wind turbines) . As the present study mainly focuses on delamination detection in concrete members of bridges, which are generally over 200‐mm‐thick, a relatively long period of time exposure to direct solar radiation could make the IR inspection more effective.…”

Section: Resultsmentioning

confidence: 89%

“…wind turbines). 24,[35][36][37][38] As the present study mainly focuses on delamination detection in concrete members of bridges, which are generally over 200-mm-thick, a relatively long period of time exposure to direct solar radiation could make the IR inspection more effective. Figure 10c shows the total heat input required to generate absolute thermal contrast of 1 C for different delamination sizes under two different heating rate and heating durations (z = 50 mm).…”

Section: Numerical Resultsmentioning

confidence: 99%

The influence of ambient environmental conditions in detecting bridge concrete deck delamination using infrared thermography (IRT)

Raja

Miramini

Duffield

et al. 2020

Struct Control Health Monit

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Summary Delamination is a serious form of deterioration in concrete bridge decks. Infrared thermography (IRT) is an advance non‐destructive testing method for concrete bridge deck delamination detection by capturing the absolute thermal contrast (ΔT) on the concrete surface caused by the disruption in heat flow due to subsurface defects. However, as the ambient environmental conditions (e.g. wind velocity and solar radiation) of a bridge could significantly affect the measurement outcomes of IRT, the optimal times for infrared data collection are still unclear. In this paper, a series of experimental and numerical studies were carried out to investigate the effects of the rate of heat flux and wind velocity on ΔT on the surface of bridge decks with the aim of identifying the optimal inspection times for different geometry characteristics of delamination (i.e. size and depth). The developed model is firstly validated by the experimental data and then a series of parametric studies were carried out. The result shows that the heat flux rate plays an important role in the development of ΔT on concrete surface, especially for a relatively shallow and small size delamination. However, the influence of heat flux rate gradually diminishes with the increase in size and depth of delamination. In addition, it demonstrates that there is a positive linear correlation between the total heat energy (external irradiation) and square of the delamination depth. The current research represents an important step towards the development of an effective and efficient way for defect detection using IRT.

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“…Recently, the thermographic approach for the material integrity and damage analysis becomes promising as the nondestructive testing technique (Ciampa et al, 2018;Wang et al, 2018Wang et al, , 2019. The current state of practice in thermal integrity analysis of civil engineering materials is to measure temperature using thermocouples or infrared probes, then estimate the temperature distributions within the structures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Aggregates in Concrete on Fiber-Optic Based Thermal Integrity Profiling Analysis of Concrete Structures

Zhong

Deng

2020

Front. Mater.

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Fiber-optic sensor has drawn wide attention in the non-destructive testing and evaluation of civil engineering materials due to its high accuracy and resolution as well as cost-efficiency. Currently, using optical fiber as the temperature sensor is proposed to conduct the thermal integrity profiling (TIP) of concrete structures. However, concrete is not a thermally homogeneous material as assumed in current studies of concrete TIP. Its essential components, such as aggregates may cause thermal inhomogeneity problems when implementing fiber-optic sensors for TIP. In this paper, we use the concrete structures with different grades of aggregates to conduct numerical simulation for non-destructive thermal testing. The goal is to investigate how the thermal inhomogeneity caused by aggregates would influence the testing result. Firstly, we establish three concrete structure models with three different grades of aggregates based on the scenarios where these concrete structures will be used. Then, we numerically simulate the thermal process on these models and extract the temperature at the location where optical fiber would be installed. The influence caused by the inhomogeneity of aggregate size and distribution as well as the possible method to minimize the effect are evaluated in the paper. Overall, aggregates of concrete have a significant influence on the accuracy of TIP analysis, and defects could be veiled if no proper treatment to the data is implemented for TIP analysis.

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Image processing based quantitative damage evaluation in composites with long pulse thermography

Cited by 112 publications

References 41 publications

Advanced NDT Methods and Data Processing on Industrial CFRP Components

Advanced NDT Methods and Data Processing on Industrial CFRP Components

The influence of ambient environmental conditions in detecting bridge concrete deck delamination using infrared thermography (IRT)

Influence of Aggregates in Concrete on Fiber-Optic Based Thermal Integrity Profiling Analysis of Concrete Structures

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