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Contribution to the Description of the Mechanical Long Term Deformation Behavior of Thermoplastics

In the past years the Finite Element Analysis (FEA) has established as a tool for the dimensioning of plastics parts. The simulation of the mechanical longterm behaviour with this tool is still a challenging task. Common FEA tools indeed offer a number of material models, but these models can not sufficiently represent the time, load and temperature dependency of the mechanical longterm behaviour of plastics. Furthermore, there are just few material data available in material databases to calibrate the material models.

This thesis presents a method to simulate the mechanical longterm behaviour of polymers over a wide range of time, temperature and load. The method includes a modification of a linear viscoelastic model and a procedure for the model calibration. On the basis of extensive experiments assumptions are made, which enable a calibration of the model on the basis of uniaxial tensional creep data, which are most of the time available in material data bases. Therefore an improvement of the simulation of plastics components can be achieved on the basis of available material data which, if necessary, are complemented by some shortterm creep data.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Tobias Naumann

Tobias Naumann
Lehrstuhl für Polymerwerkstoffe
Universität des Saarlandes

Information

Free keywords: Creep, relaxation, free volume, viscoelastic, material model, time-temperature-superposition
Institute / chair: Naturwissenschaftlich-Technische Fakultät III der Universität des Saarlandes
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Markus Stommel (Betreuer), Prof. Dr.-Ing. Dr.-Ing. E. h. Walter Michaeli
Publication year: 2012
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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