Computer-aided analysis of ultrasound data to speed-up the release of aerospace CFRP components

摘要

The Ultrasonic non-destructive testing of aeronautic composite structures requires, in addition to the inspection itself, a very lengthy work of analysis of the results. Detection of defects in carbon fibre reinforced plastics (CFRP) by ultrasonic pulse echo inspection is usually based on the analysis of both attenuation and Time of Flight (ToF) C-scans. Differences in amplitude as well as differences in ToF can be the result of porosity, inclusions or delamination defects. This complex analysis becomes the critical path in the testing process and can be the major cost contributor. This paper presents a selection of user friendly software tools to simplify and speed-up this diagnosis. They are dedicated to composites. For the purpose of equipment harmonization and cost reduction, they can be applied on files acquired with most ultrasound instruments supplied by the major manufacturers. The aim of these tools is to concentrate on all the data which affects the acceptance criteria. In summary they help operators to focus their attention on any suspicious area, to know if a concession has to be requested, or if the component has to be repaired or rejected. They can even be applied on huge C-scans obtained when it is required to scan very large components, or after merging several smaller files acquired separately. All of these Tools are included in "NDT kit" & "Ultis" software. They are currently used on a daily basis to inspect many EADS Products and Platforms including the A350XWB aircraft...