X-Ray Diffraction Evaluation of Adhesive Bonds and Damage in Composites

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1981
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Barrett, Charles
Predecki, Paul
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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Stresses can be measured by X-ray diffraction, not only in metals but also in polymeric composites containing some crystalline filler particles. Diffraction is found effective in disclosing the distribution of stresses over the surface of adhesively bonded joints in aluminum strips when loads well below the yield point are applied. When two 6061-T6 aluminum strips 1/16" or 1/32" thick and 3/4" wide are adhesively bonded in a single lap joint and loaded in tension, maps giving the distribution of the X-ray-measured stresses show clear evidence of the way in which stresses are transferred from one adherend to the other. The maps show the limits of the bonded area with an accuracy about equal to the width (1 mm) of the irradiated area along the specimen. Attendant bending stresses resulting from the loading are also registered. Stress values can be obtained from the observed diffraction angles by calibration with tensile tests of a single unbonded strip. Similar results are obtained for graphite/epoxy laminates adhesively bonded to aluminum when diffraction is from the aluminum, but a much lower accuracy was obtained when diffraction was from the filled composite.

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