Section 6
Free Access
Thermoplastics under Long-Term Loading: Experiments and Viscoelastic-Viscoplastic Modeling
Abstract
The behavior of polyoxymethylene, a semicrystalline thermoplastic, with respect to mechanical long-term loads is studied. Experiments demonstrate the creep behavior for constant load and also for cyclic unloading. The latter shows partial time-dependent strain recovery during unloading and an extended lifetime. Based on the experimental results, a viscoelastic-viscoplastic-damage material model for finite strains is proposed. Numerical simulations are compared to the experimental results demonstrating the model's capabilites and limitations. (© 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)
