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Thermoplastics under Long‐Term Loading: Experiments and Viscoelastic‐Viscoplastic Modeling
Author(s) -
Zerbe Patrick,
Schneider Benjamin,
Moosbrugger Egon,
Kaliske Michael
Publication year - 2015
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201510178
Subject(s) - viscoplasticity , creep , viscoelasticity , materials science , polyoxymethylene , thermoplastic , term (time) , constant (computer programming) , composite material , mechanics , structural engineering , finite element method , constitutive equation , computer science , engineering , physics , polymer , quantum mechanics , programming language
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)