Paper number 396

COMPOSITE MATERIALS AND STRUCTURES TESTING BY ELECTRONIC HOLOGRAPHY

Dan N. Borza¹

1Laboratoire de Mécanique de Rouen, Institut National des Sciences Appliquées de Rouen
Place Blondel, BP 08, Mont-Saint-Aignan, France

Summary

The paper presents the use of phase-stepped electronic holography as an NDT tool, in particular using vibration stressing for detecting structural and material damage, and using thermal stressing for detecting defects in composites. After a short introductory description of this technique and of the most frequently used stressing methods used in testing, some of the criteria used for localization and identification of defects are presented and illustrated with experimental results. Both material damage and assembling faults are detected by applying these criteria and by an adequate choice of the frequency range of excitation and of the optical setup parameters.

Keywords

interferometry, electronic holography, non-destructive testing, stressing techniques, wrapped phase, fringe visibility, vibrations, thermal.