Enhancing Detectability and Dimensional Accuracy of multi-material Parts’ inspections for Computed Tomography

Speaker:
Lasagni, Fernando; CATEC - Advanced Center for Aerospace Technologies; Spain

Authors:
Gutiérrez, N.; CATEC - Advanced Center for Aerospace Technologies; Spain
Galleguillos, C.; CATEC - Advanced Center for Aerospace Technologies; Spain
González, S.; CATEC - Advanced Center for Aerospace Technologies; Spain
Lasagni, F.; CATEC - Advanced Center for Aerospace Technologies; Spain

ID: ECNDT-0511-2018

Nowadays, the requirements of the aerospace industry are continuously increasing the complexity of parts, involving novel manufacturing processes, complex geometries and multi-material structures (including Aluminium, Titanium-alloys and composite materials). At the same time, manufacturing quality has to be guaranteed using advanced quality assurance techniques. In this context, X-ray computed tomography (XCT) is considered one of the most powerful non-destructive techniques when requiring complex inspections, mainly during part development phase or for failure analysis on service parts. However, one of the limitations of the technology is related with distortions and artefacts in the digital reconstructions of elements having different X-ray absorption coefficients.
In this study, multi-material inspections by XCT are analysed and enhanced by two different approaches. The first one based on image processing of digital radiographies. The second is focused on the combination of results obtained from inspections with different parameters (Dual Energy Computed Tomography). The main goal is the reduction of severe streaking artefacts produced by materials with high attenuation, but avoiding blurry, non-accurate and noise data at the same time.