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A torsion box consists of two thin layers of material (skins) on either side of a lightweight core, usually a grid of beams. It is designed to resist torsion under an applied load. A hollow core door is probably the most common example of a torsion box (stressed skin) structure. The principle is to use less material more efficiently.
Core material: Material within the door used simply to fill space, provide rigidity and reduce druminess. Hollow-core – Often consists of a lattice or honeycomb made of corrugated cardboard, extruded polystyrene foam, or thin wooden slats. Can also be built with staggered wooden blocks. Hollow-core molded doors are commonly used as interior ...
Casing: Finish trim around the sides of a door or window opening covering the gap between finished wall and the jam or frame it is attached to. Cartouche (in French) escutcheon: Framed panel in the form of a scroll with an inscribed centre, or surrounded by compound mouldings decorated with floral motifs
When cups and shells are drawn from flat sheet metal, the edge is left wavy and irregular, due to uneven flow of metal. Shown is flanged shell, as well as the trimmed ring removed from around the edge. While a small amount of material is removed from the side of a component in trimming tool. [2] Trimming tool
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[2] [6] Waffle slabs are a common type of hollow-core slab which use the same principle as voided biaxial slabs. However, their voids are placed on the underside of the slab rather than embedded within the slab, leading to lower shear strength and fire resistance. [ 7 ]