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Temperature and Strain Rate Dependent Simulation of High Speed Tensile Tests of I-PP

The aim of this study is to minimise the testing effort for material characterisation in the linear viscoelastic region. Results derived from Dynamic-Mechanical-Analysis (DMA) and bulk tests are combined and compared with the elasticity modulus (E) measured by tensile tests. Using the thermorheologic simple theory a time-temperature shifted relaxation spectrum of isotactic polypropylene is generated from shear and bulk experiments. However, the time-temperature shift functions for the load cases have different curve progressions. The relaxation spectra are fitted with a modified generalised Maxwell model. With this data, simulations of tensile tests are performed via finite-element-analysis (FEA) with the software MARC. For comparison, tensile tests at varying strain rates (10 -3 s -1 to 10 1 s -1 ) and temperatures (-20°C to +40°C) are executed. Thus, the glass transition temperature of approximately 0°C /1/is well within the experimental temperature range.