Rubber material is an engineering material : To design adquately ,basic machanical properties must be appreciated. The three elementary type of strain for isotropic material are simple tension simple shear and uniform compression (hydrostatic) . The behavior for these cases is define by constant : Young’s modulus E (tension) ,rigidity modulus G (shear) ,bulk modulus K (compression) and Poisson’s ratio v . Poisson’s ratio is 0.5 for a totally incompressible solid. For elastomer v is 0.499 + (for steel v is approximately 0.3) .For an isotropic incompressible material , E = 3 G. The essential incompressibility of rubber material has many consequences in design , manufacturing and application.
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