Internal displacements relating different structures

Generally viscoelastic problems can be solved using relations between internal stresses and external loads subject to the geometry of the structure in a similar manner as for elastic materials in the subject areas mentioned above. For both elastic and viscoelastic materials, the state of the material or equations of state must be included. Here elastic and viscoelastic materials are different in that the former does not include memory (or time dependent) effects while the latter does include memory effects. Because of this difference, stress, strain and displacement distributions in polymeric structures are also usually time dependent and may be very different from these quantities in elastic structures under the same conditions. 

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