Single- and multiscale aspects of the modeling of curing polymers



Within this contribution, the focus is placed on the simulation of the isochoric behavior of polymers during the curing process. To this end, a model based on the assumption of free energy in the form of a convolution integral is applied. Since this allows the implementation of the time-dependent material parameters, the free energy is interpreted as the total accumulated energy. Different from this, the strain energy is related to the current state of deformation and used to define the temporary stiffness. In order to avoid volume locking effects typical of isochoric materials, the free energy is furthermore split into a volumetric and a deviatoric part. A multifield description depending on the displacements, volume change and hydrostatic pressure is introduced as well. The model is implemented within a single- and multiscale FE program and used to simulate the behavior of homogeneous and microheterogeneous polymers. (© 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)