Rigidity El

Tensile modulus of elasticity (E) is one of the two factors that determine the stiffness or rigidity (EI) of structures comprised of a material. The other is the moment of inertia (I) of the appropriate cross section, a purely geometric property of the structure. In identical products, the higher the modulus of elasticity of the material, the greater the rigidity; doubling the modulus of elasticity doubles the rigidity of the product. The greater the rigidity of a structure, the more force must be applied to produce a given deformation.

It is appropriate to use E to determine the short-term rigidity of structures subjected to elongation, bending, or compression. It may be more appropriate to use the flexural modulus to determine the short-term rigidity of structures subjected to bending, particularly if the material comprising the structure is non-homogeneous, as foamed or fiber-reinforced materials tend to be. Also, if a reliable compressive modulus of elasticity is available, it can be used to determine short-term compressive rigidity, particularly if the material comprising a structure is fiber-reinforced. The room temperature E for several plastics and some other materials are presented in Chapter 2.

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