A Pressure-Dependent Nonlinear Viscoelastic Schapery Model for POM
The nonlinear viscoelastic behavior of POM was characterized in tensile and compression tests. Digital image correlation strain measurements were used the determine the axial and transverse strain, thus providing the necessary data for three-dimensional modeling. The nonlinear viscoelastic model of Schapery was chosen to describe the time-dependent mechanical behavior. A parameter identification procedure using nonlinear optimization is presented. It is shown that the Schapery model is capable of describing the nonlinear viscoelastic relaxation behavior in tension and compression.
KeywordsDigital Image Correlation Relaxation Test Transverse Strain Stress Relaxation Test Prony Series
The research work of this paper was performed at the Polymer Competence Center Leoben GmbH (PCCL, Austria) within the framework of the COMET-program of the Austrian Ministry of Traffic, Innovation and Technology with contributions by the University of Leoben. The PCCL is funded by the Austrian Government and the State Governments of Styria and Upper Austria.
- 11.Henriksen M (1984) Nonlinear viscoelastic stress analysis – a finite element approach. Comput Struct 18(1):133–139Google Scholar
- 12.Tscharnuter D, Jerabek M, Major Z, Pinter G (In Press) Uniaxial nonlinear viscoelastic viscoplastic modeling of polypropylene. Mech Time Depend MaterGoogle Scholar
- 17.Rao S (1996) Engineering optimization – theory and practice, 3rd edn. Wiley, New YorkGoogle Scholar