Oxidative ageing of elastomers: experiment and modelling

Autor: M. Zaghdoudi, A. Kömmling, M. Jaunich, D. Wolff
Rok vydání: 2022
Předmět:
Zdroj: Continuum Mechanics and Thermodynamics.
ISSN: 1432-0959
0935-1175
DOI: 10.1007/s00161-022-01093-9
Popis: During an extensive test programme at the Bundesanstalt für Materialforschung und prüfung, material property changes of EPDM O-rings were investigated at different ageing times and two ageing temperatures of $$125\,^{\circ }\,\hbox {C}$$ 125 ∘ C and $$150\,^{\circ }\, \hbox {C}$$ 150 ∘ C . To exclude possible diffusion-limited oxidation (DLO) effects that can distort the data, IRHD microhardness measurements were taken over the cross section of compressed O-rings. Continuous stress relaxation measurements were taken on samples free of DLO effects. The additional effect of physical processes to irreversible chemical ones during a long-term thermal exposure is quantified by the analysis of compression set measurements under various test conditions. By combining the different experimental methods, characteristic times relative to the degradation processes were determined. On the basis of experimental data, a microphysically motivated model that takes into account reversible and irreversible processes was developed. The parameter identification strategy of the material model is based on our experimental investigations on homogeneously aged elastomer O-rings. The simulated results are in good agreement with the experiments.
Databáze: OpenAIRE
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