Quantcast Modifying a Cross-Section to Avoid Overdesign

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a) The relationship between load capacity and layer
thickness is nonlinear.  Halving a cross-section
thickness will more than halve the load capacity.
b) Larger thicknesses of materials are not generally
available.  Avoid selecting glass layer thicknesses
over 3/4 inch (19 mm).
c) When decreasing the thickness of a layer, attempt to
maintain uniform thicknesses among the layers in a
plate while minimizing the overall thickness of the
plate.  For example, two 3/8-inch (9-mm) layers are
preferred to a plate with 1/2-inch (12-mm) and 1/4-
inch (6-mm) layers, and a plate consisting of 5/8-
inch (16-mm), 1/2-inch (12-mm), and 1/2-inch (12-mm)
layers is preferred to one with 3/4-inch (19-mm),
1/2-inch (12-mm), and 1/4-inch (6-mm) layers.
However, a plate consisting of 5/8-inch (16-mm) and
1/4-inch (6-mm) layers is preferred to one with two
1/2-inch (12-mm) layers.


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