5003 Lectures - Faculty of Engineering and Applied Science

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E5003 - Ship Structures I 218 © C.G. Daley Plates are the essential structural components in ships. Almost all the structural weight in ships is from the shell plating, the bulkheads, decks and webs of large frames. This section will examine the lateral deformation of a single plate panel subject to a uniform pressure. We will limit our problem as follows; • rectangular plate • constant thickness (t
E5003 - Ship Structures I 219 © C.G. Daley Plates can bend in 3 ways; • x-bending • y-bending • twist X and y bending are similar to beam bending. Recall that there are no membrane stresses, therefor no x and y stresses at the mid-plane. Stresses only arise from bending, and are equal, opposite and maximum on the bottom and top of the plate. Twist is a behavior that does not occur in beams, although it is something like torsion. Twist causes a shear strain in the top (and bottom) of the plate, and results in curvature on 45° diagonals. When we twist a dx x dy portion of a plate we get; therefore Δ =
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5003 Lectures - Faculty of Engineering and Applied Science

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