![]() ![]() We can assess the relative compressibility of a material by the ratio of its initial bulk modulus,, to its initial shear modulus. Elastomeric foams are discussed in “Hyperelastic behavior in elastomeric foams, ” Section 19.5.2. In applications where the material is not highly confined, the degree of compressibility is typically not crucial for example, it would be quite satisfactory in Abaqus/Standard to assume that the material is fully incompressible: the volume of the material cannot change except for thermal expansion.Īnother class of rubberlike materials is elastomeric foam, which is elastic but very compressible. In cases where the material is highly confined (such as an O-ring used as a seal), the compressibility must be modeled correctly to obtain accurate results. This behavior does not warrant special attention for plane stress, shell, membrane, beam, truss, or rebar elements, but the numerical solution can be quite sensitive to the degree of compressibility for three-dimensional solid, plane strain, and axisymmetric analysis elements. Most elastomers (solid, rubberlike materials) have very little compressibility compared to their shear flexibility. ![]()
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