The Detection and Characterization of Defects in Metal/Non-metal Sandwich Structures by Thermal NDT, and a Comparison of Areal Heating and Scanned Linear Heating by Optical and Inductive Methods

Чулков, А. О.; Tuschl, Christoph; Нестерук, Д. А.; Oswald-Tranta, Beate; Вавилов, В. П.; Kuimova, Marina Valeryevna

doi:10.1007/s10921-021-00772-y

Cited by 16 publications

(4 citation statements)

References 28 publications

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“…It is worth pointing out that the simulation took into account additive noise with an amplitude of 0.1°C and multiplicative noise with an amplitude of 5%. The concept of noise in TNDT is described in detail in [15,33]. Table 4: Thermal properties of materials used in numerical stimulation [15].…”

Section: Optimizing Tndt Test Parametersmentioning

confidence: 99%

A method and apparatus for inspecting large flat composite parts by using the Infrared LST technique

Вавилов

Чулков

Нестерук

et al. 2022

Frattura Ed Integrità Strutturale

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The principle of Line Scan Thermography (LST) was used to develop a self-propelled infrared thermographic nondestructive testing device for the inspection of large, relatively flat composite aerospace parts, such as aircraft wings. The design of the unit allowed the suppression of noise from reflected radiation. The new equipment, using the LST method, provided defect detectability similar to that achieved with a classic, static, flash heating procedure, but with a higher rate of testing. Also, the line heating principle ensured more uniform thermal patterns, and the proper choice of scan speed and field of view allows the selection of optimal time delays and the creation of maps of defects at different depths. Defect characterization efficiency was improved by using a trained neural network.

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Section: Optimizing Tndt Test Parametersmentioning

confidence: 99%

A method and apparatus for inspecting large flat composite parts by using the Infrared LST technique

Вавилов

Чулков

Нестерук

et al. 2022

Frattura Ed Integrità Strutturale

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“…In this study, a new method of thermal NDT is proposed being based on using pulsed convection cooling, which is turned on after a certain time after the main heat pulse [1]. The method can be implemented in a scanning procedure of thermal NDT, providing a high inspection performance [2,3]. The effectiveness of the proposed method has been proven by the results of numerical simulation and experimentation, which have demonstrated a significant increase in signal-to-noise ratio (SNR), as well as improvement in the visual recognition of temperature anomalies in defect areas.…”

Section: Introductionmentioning

confidence: 99%

Combining heating and forced cooling: a new technique in active thermal NDT

Chulkov,

Vavilov

2023

Proccedings of the 2023 International Conference on Quantitative InfraRed Thermography

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The theoretical and experimental results of applying a new method of infrared (IR) thermography nondestructive testing (NDT) based on the combination of optical heating and forced convection cooling are described. A properly chosen combination of two types of thermal stimulation has allowed to increase temperature contrasts in defect areas and reduce thermal loading on the samples. The 3D model of a scanning thermal flaw detector implementing the proposed inspection technique is presented.

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“…For high diffusivity materials like metals, due to the high heat diffusive phenomena, active thermography (AT) can be considered only for surface or subsurface controls [7]. Basically, pulsed thermography and lock in thermography are commonly used among optical infrared thermography approaches, that includes also the use of other techniques, such as induction thermography, pulse compression thermography, and laser spot thermography [9]- [18]. In pulsed thermography (PT), the investigated material is stimulated by a short-duration energy pulse (likely, flash lamp, eddy-current, laser, etc.…”

Section: Introductionmentioning

confidence: 99%

Analysing the probability of detection of shallow spherical defects by means of Active Thermography

D’Accardi

Palumbo

Errico

et al. 2022

Preprint

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The capability of Active Thermography (AT) techniques in detecting shallow defects has been proved by many works in the last years, both on metals and composites. However, there are few works in which these techniques have been used adopting simulated defects more representative of the real ones. The aim of this work is to investigate the capability of Active Thermography of detecting shallow spherical defects in metal specimens produced with laser powder bed fusion (L-PBF) process and characterized by a thermal behaviour very far from the flat bottom hole and so near to the real one. In particular, the quantitative characterization of defects has been carried out to obtain the Probability of Detection (PoD) curves. In fact, it is very common in non-destructive controls to define the limits of defect detectability by referring to PoD curves based on the analysis of flat bottom holes with a more generous estimation and therefore not true to real defect conditions. For this purpose, a series of specimens, made by means of Laser-Powder Bed Fusion technology (L-PBF) in AISI 316L, were inspected using Pulsed Thermography (PT), adopting two flash lamps and a cooled infrared (IR) sensor. To improve the quality of the raw thermal data, different post-processing algorithms were adopted. The results provide indications about the advantages and limitations of Active Thermography (AT) for the non-destructive offline controls of the structural integrity of metallic components.

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The Detection and Characterization of Defects in Metal/Non-metal Sandwich Structures by Thermal NDT, and a Comparison of Areal Heating and Scanned Linear Heating by Optical and Inductive Methods

Cited by 16 publications

References 28 publications

A method and apparatus for inspecting large flat composite parts by using the Infrared LST technique

A method and apparatus for inspecting large flat composite parts by using the Infrared LST technique

Combining heating and forced cooling: a new technique in active thermal NDT

Analysing the probability of detection of shallow spherical defects by means of Active Thermography

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