Elastomers rigidity under shear

The influence of the geometry of the piece on the behavior of the elastomer under both compression and shear can be determined by calculating the rigidity under compression, Kc, and the rigidity under shear, K, defined... 

The engineering property that is of interest for most of these applications, the modulus of elasticity, is the ratio of unit stress to corresponding unit strain in tension, compression, or shear. For rigid engineering materials, unique values are characteristic over the useful stress and temperature ranges of the material. This is not true of natural and synthetic rubbers. In particular, for sinusoidal deformations at small strains under essentially isothermal conditions, elastomers approximate a linear viscoelastic... 

Other important parameters are the shear modulus or modulus or rigidity (G), which is the mount s (or other elastomeric components ) ability to resist shear when forces are applied in opposing directions. For instance, there could be engine torque applying a load in a particular direction upon hard acceleration, while simultaneously a road impact force could be applied to the frame in another direction. This quantity is represented by the shear stress (x) over shear strain (e). Finally, the bulk modulus (K) plays a role in these types of components. The bulk modulus describes how a component elastomer will behave under pressure in three dimensions. Volume is considered here and typical units are in gigapascals (GPa). Equation 2.11 describes the bulk modulus mathematically, and Figure 2.7 shows the value graphically. 

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