Ultrasonic C-Scan and shearography NDI techniques evaluation of impact defects identification

Damage identification in aircraft composite structures: A case study using various non-destructive testing techniques

“…Additional NDT methods applied in the inspection of aircraft composite structures cover: lighting protection sheet (LPS) sensing [21], shearography [22], digital image correlation (DIC) [23], X-ray computed tomography (CT) [24] and others. However, these methods have limited applicability due to many reasons, e.g.…”

Bird and hail stone impact resistance analysis on a jet engine composite air inlet

“…The entire composite air inlet assembly was subjected to detailed non-destructive inspections before and after the impact tests. NDT (non-destructive testing) activities consisting of visual and ultrasonic inspections were performed by Level 2 qualified NDT staff [13].…”

Assessment of impact damage in CFRP by combined thermal and speckle methods

“…While ultrasonic testing is very much appropriate for delineating debonding areas, it is a scanning technique and therefore limited in lateral resolution and speed of application, lock-in thermography has better imaging properties, but its acquisition time increases with depth. Finally, Digital Speckle Pattern Interferometry (DSPI) gives information complementary to the size and location of the defect in that it helps in assessing the surface strain field around the defect [5]. Since strain is an ideal parameter to quantify damage in a manner that supports the assessment of structural integrity and in particular residual life, the combination of thermal and laser based methods allows for an assessment of both the defect size and structure as well as its effect on the component behavior under service load.…”