Abstract
This paper presents an innovative variant of the Active Transient Thermography (ATT), designated Double Active Transient Thermography (DATT), where the component inspected is excited by one heat and one cold sources. The goal is to speed up and improve the temperature contrast, namely for polymer matrix composites parts produced by Additive Manufacturing. Finite element analysis of the thermal phenomena involved in DATT were performed to assist the definition of the experimental set-ups and confirm the high potential of the technique. Experimental results prove that the introduction of the cold flow increases the temperature contrast up to 100%, comparing with ATT, and mid thickness defects are the ones that benefits the most from this technique. Therefore, the improvement of the inspection procedure is achieved by two means: enhancing the thermal contrast of the defects, and/or anticipating the instant when the maximum contrasts occur.
| Original language | English |
|---|---|
| Article number | 102566 |
| Journal | NDT and E International |
| Volume | 125 |
| DOIs | |
| Publication status | Published - Jan 2022 |
| MoE publication type | A1 Journal article-refereed |
Funding
Authors gratefully acknowledge the funding of Project POCI-01-0145-FEDER-016414 (FIBR3D), cofinanced by Programa Operacional Competitividade e Internacionalização and Programa Operacional Regional de Lisboa, through Fundo Europeu de Desenvolvimento Regional (FEDER) and by National Funds through Fundação para a Ciência e a Tecnologia ( FCT - MCTES ). MAM, MSC and TGS acknowledge FCT - MCTES for its financial support via the project UIDB/00667/2020 (UNIDEMI).
Keywords
- Active transient thermography
- DATT
- Polymer matrix composites
- Simulation
