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Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
(a) A circular plate with outer radius , which has an inclusion of radius . (b) The end of a cylindrical beam sits inside the inclusion of the plate. It is noted that the ratio of to has been exaggerated in the figure for the purpose of illustration.