Nonlinear Elastic Properties of Molten Plastics
1973; Elsevier BV; Linguagem: Inglês
10.1016/b978-0-12-215150-7.50013-2
Autores Tópico(s)Polymer crystallization and properties
ResumoThis chapter discusses the nonlinear elastic properties of molten plastics. The processing of plastics involves flow of molten plastics through small channels into molds and a complete understanding of phenomena, such as the distribution of molecular orientation, over the cross-section of the solid molded plastic cannot be obtained on the basis of classical hydrodynamics. There are several nonclassical rheological properties of molten plastics which are of equal importance. Underlying most attempts to formulate suitable constitutive equations for plastics, and polymeric materials generally, is the assumption that, for incompressible materials at constant temperature, the stress at time t in a material element is determined to within an additive isotropic stress by the history up to time t of the separations of all neighboring particles in the element.
Referência(s)