Quantitative evaluation of the welded area in Resistance Projection Welded (RPW) thin joints by pulsed laser thermography

Dell'Avvocato, Giuseppe; Gohlke, Dirk; Palumbo, Davide; Krankenhagen, Rainer; Galietti, Umberto

doi:10.1117/12.2618806

Cited by 12 publications

(6 citation statements)

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“…The entire heating of almost 2 s can be evaluated, or only a part of it, to simulate different pulsed tests in the post-processing analysis [11,12]. Then, the sequences related to the contrast and the normalized contrast (CNR) [11] have been evaluated, considering a sound area near the crack (25 × 25 pixels 2 ).…”

Section: Procedures For Data Analysis and Resultsmentioning

confidence: 99%

Detection and Characterization of Short Fatigue Cracks by Conduction Thermography

D’Accardi,

Palumbo,

De Finis

et al. 2023

Aita 2023

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Section: Procedures For Data Analysis and Resultsmentioning

confidence: 99%

Detection and Characterization of Short Fatigue Cracks by Conduction Thermography

D’Accardi,

Palumbo,

De Finis

et al. 2023

Aita 2023

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“…• Linear regression in a log-log scaleanalysis of 31 different intervals, not evenly spaced (every 0.1 s until 0.5 s of cooling down, after every 0.25 s until 7 s or 4096 frames), to obtain, also in this case, a sequence of maps related to the Slope Coefficient and the Square Correlation Coefficient R 2 [24], [33]. ➢ Definition of Regions of Interest (ROIs), with a matrix of 3x3 pixels for each defect and four different matrices of 5x5 pixels for the sound material.…”

Section: Data Processing Procedures and Resultsmentioning

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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“…Over the years, infrared (IR) thermography has proven to be a versatile tool in the field of experimental mechanics and mechanical design. This contactless and nondestructive technique allows for comprehensive structural integrity investigations 1,2 (the defect detection in steel plates, 3 composites, [4][5][6][7] 3D printed materials 8 and welded joints, 9 and the evaluation of fatigue cracks 10 ), the stress analysis (thermoelastic stress analysis [TSA]) evaluations, [11][12][13][14][15][16] and energy-based assessments to study fatigue processes. 17,18 Thermography-based methods have come a long way, thanks to improved equipment and robust data analysis tools.…”

Section: Introductionmentioning

confidence: 99%

Fatigue limit estimation of metals based on the thermographic methods: A comprehensive review

Zaeimi,

De Finis,

Palumbo

et al. 2024

Fatigue Fract Eng Mat Struct

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Infrared thermography has been under review in the last 30 years due to its versatility and potential in the detection of the thermal signature associated with intrinsic energy phenomena due to dissipative processes, specifically those relying on mechanical fatigue. Nowadays, it is a well‐established technique that can support mechanical and structural engineers to implement a damage‐tolerant design, assess the residual life, and finally characterize the fatigue behavior of materials. The aim of this work is to review all thermography‐based approaches and procedures for fatigue limit estimation by rapid tests, drawing considerations on the applicability of thermal methods in fatigue assessment of mechanical components, proposing the capabilities of different thermal indices in fatigue assessment, and discussing the pros and cons of each method as well as the open points. On one hand, this review intends to sum up what has already been done in the field; on the other hand, it provides a guideline to direct new researches toward issues that should be resolved or understood.

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Quantitative evaluation of the welded area in Resistance Projection Welded (RPW) thin joints by pulsed laser thermography

Cited by 12 publications

References 0 publications

Detection and Characterization of Short Fatigue Cracks by Conduction Thermography

Detection and Characterization of Short Fatigue Cracks by Conduction Thermography

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

Fatigue limit estimation of metals based on the thermographic methods: A comprehensive review

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