Paper number 1016
|DETERMINATION OF STIFFNESS REDUCTION AND DAMAGE ACCUMULATION MONITORING IN COMPOSITE MATERIALS USING ULTRASONIC TECHNIQUES|
Ph. Margueres, F. Meraghni and M.L. Benzeggagh
Université de Technologie de Compiègne, LG2mS UPRES A CNRS 6066
Département Génie Mécanique - Centre de Recherche de Royallieu, BP 20529
60205 Compiègne Cedex, France
|Summary||This general purpose of this is the use of ultrasonic technologies to determine and monitor the residual mechanical properties of monolithic composite materials subjected to progressive damage. The study bases on comparison of experimental elastic constants obtained by standard mechanical tests and ultrasonic techniques. A numerical analysis completes this approach. The amplitude treatment of acoustic emission signals, Scanning Electron Microscopy (SEM) observations and C-Scan investigation are used to define damage evolution. The reliability of the methodology has been first validated on undamaged materials of different intrinsic properties. The current results for damaged materials highlight the variation of the intrinsic properties such as induced anisotropy. The elastic constants obtained after damaging by mechanical and ultrasonic techniques are in good agreement. The validation of the methodology on damaged materials could constitute a powerful tool able to define local residual properties, and useful for structures life span monitoring.
||Keywords|| residual properties, US measurements, wave speeds, C-Scan, acoustic emission, impact, fatigue, damage mechanisms.
Theme : NDE and Reliability ; Ultrasonic Inspection
[ HOME ] [ BACK ]