A recent achievement on NDE of crevice corrosion is described. Electronic Speckle Pattern Interferometry (ESPI) was employed to reveal the existence of crevice corrosion which is hardly detectable from outside by visual inspection. The ESPI setup described here is for measurement of out-of plane displacement. Both thermal loading and vacuum loading were used. The anomaly of fringe pattern tells the existence of crevice corrosion hidden in between the two plates which compose the specimen. Not only the location of defects, but also the approximate size can be estimated.

Subject
Nondestructive testing, Corrosion failures, Deformation, Aircraft, Additives, Structures, Tolerances, Corrosion detection, Interferometry, Defects, Anomalies, Crevice corrosion, Lasers
Keywords:
NDT, crevice corrosion, laser speckle, ESPI
© 1995 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1995
Association for Materials Protection and Performance (AMPP)
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