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The difference between elastomeric and incompressible rubber

The difference between elastomeric and incompressible rubber

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Elastic rubber: refers to the nature of a reversible deformation shows a kind of polymer material with natural rubber represented under external force. The elastic rubber is entropy elasticity, high elasticity is mainly internal entropy contribution within this contribution is zero.
1. incompressible deformation refers to the total volume after deformation (incompressible), not undeformable, and incompressible materials, Poisson's ratio is 0.5, only in the micro deformation is established, when the deformation continues to increase, Poisson ratio drops2., we can simply look at the problem of small elastic deformation of a three-dimensional unidirectional stretch, and deduce the volume and length changes before and after, and we can get the equation: 1|9_%z4D2| (T) w2qDV/V= (1-2v) dL/L, when v=0.5, you can see dV=0, that is, the volume change is 0., r*P0, Z (n9e), or, from the definition of bulk modulus K, the bulk modulus is defined as the ratio of hydrostatic pressure to the corresponding volume changeK=stress_11 (hydrostatic pressure 11=22=33) / (strain_11+strain22+strain_33) =E/ (3 (1-2v)), E-Young's modulus, v-poisson's ratio. when v=0.5, K-- infinity, that is to say that the volume change of the infinitely small, incompressible3., non recoverable deformation refers to plastic deformation, and rubber is a large deformation material. In theory, it can be idealized as an elastic material without plastic yielding. Therefore, rubber deformation refers to recoverable elastic deformationThey are different from each other. Actually, they all represent the physical properties of rubber. There is no difference between them!
Incompressible rubber:An incompressible material is an ideal material that does not actually exist. Rubber is a relatively incompressible material with a Poisson's ratio of 0.47Relationship between strain and Poisson's ratio of an incompressible cylinder after tension(the Poisson's ratio of air is 0, and the Poisson's ratio of water is 0.5)

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