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Flexural rigidityFlexural rigidity is defined as the force couple required to bend a rigid structure to a unit curvature. Additional recommended knowledgeIn a beam or rod, flexural rigidity varies along the length as a function of x shown in the following equation: where E is the modulus of elasticity, I is the 2nd moment of inertia, y is the transverse displacement of the beam at x, and M(x) is the bending moment at x. Flexural rigidity has SI units of Pa·m4 (which also equals N·m²). Flexure of the lithosphereThe thin lithospheric plates which cover the surface of the Earth are also subject to flexure, when a load or force is applied to them. On a geological timescale, the lithosphere behaves elastically and can therefore bend under loading by mountain chains, volcanoes and so on. The flexure of the plate depends on: 1. The plate thickness
As flexural rigidity of the plate is determined by the Young's modulus, Poisson's ratio and cube of the plate thickness, it is a governing factor in both (1) and (2). See also |
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Flexural_rigidity". A list of authors is available in Wikipedia. |