La thermographie infrarouge active consiste à soumettre l’élément à contrôler à une excitation extérieure maîtrisée et à y analyser la propagation de la chaleur : les perturbations visualisées révèlent alors les éventuels défauts surfaciques ou subsurfaciques tels que fissures, délaminages, corrosion, inclusions d’eau ou d’éléments étrangers, etc. La formation du Cetim, sur deux jours, débute par la présentation des principes physiques de la méthode, les matériels utilisés, les types d’excitation, les logiciels de traitement d’image, les paramètres d’influence, etc.
La société Otecmi, a souhaité se former à la thermographie infrarouge active. Une technique bien adaptée à la détection des défauts dans les composites…
A small fuel oil return line of a stationary gas turbine engine failed by high cycle fatigue cracking. In the metallurgical root cause investigation, performed by the original equipment manufacturer’s laboratory, it was determined that insufficient support of the fuel line and the ensuing vibration led to dynamic alternating bending stresses, that had their maximum immediately adjacent to the connector weld of the flange…………. 
Thermo-mechanical treated(TMT) rebar is suitable material for reinforcing concrete structures on accounts of similarity in thermal expansion, ability to bond well with concrete and, above all the ability to shoulder most of the tensile stress acting on the structure and also steel manufacturing industry has successfully developed a corrosion-resistant variety of rebar for the construction industry. As the TMT is the finish product thus proper control of rolling parameters and water box is needed to achieve adequate property. Water box plays an important role for achieving the final structure and property of the rebars.Water box is responsible for outer rim formation and which helps to achieve the yield strength of the material. The present paper highlights failure investigation of a failed rebar during bending operations. From Fractography and microstructural analysis it is confirmed that the rebar sample failed in brittle manner due to through harden martensitic structure and which indicates that there is some anomaly in water box resulting in these premature failures.
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