Quantification of corrosion in aircraft structures with double pass retroreflection

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Journal titleCanadian Aeronautics and Space Journal
Pages7682; # of pages: 7
SubjectAging of materials; Aircraft materials; Corrosion; Corrosion protection; Finite element method; Imaging techniques; Inspection; Mathematical models; Nondestructive examination; Surfaces
AbstractDouble pass retroreflection (D SightTM) optical systems for corrosion detection have been developed over the last three years, and commercial systems are already in the hands of customers. D Sight Aircraft Inspection Systems (DAIS) have initially been conceived as methods for rapidly locating defects in aircraft structures. While these defects were to be inspected by more traditional and slower methods, in the course of research studies initiated to support the DAIS development, it was realized that the bulging of skins between the rivets (pillowing) can be detected with DAIS at very low levels of corrosion thinning (less than 3%). Modelling of corrosion pillowing was then undertaken using closed form and finite element methods. Riveted skin surface deformations were calculated at various levels of corrosion, and a ray tracing program was used to simulate DAIS images. Several factors affecting these images were investigated: relative and absolute skin thickness in the joint, rivet patterns and spacing, as well as surface reflectivity. Using the results obtained it is now possible to estimate the level of corrosion in a joint using simulated images and simple graphs, and this could be expressed in percent corrosion or stress terms.
Publication date
AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Access conditionunclassified/unlimited
Peer reviewedNo
NRC numberSMPL-1996-0052
NPARC number8931909
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Record identifier8c3b3edc-1227-4eff-815f-d8642a76aae0
Record created2009-04-23
Record modified2016-05-09
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