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Model Based Life-Time Prediction for Dynamically Loaded Elastomer Components

Lifetime-predictions in technical applications are performed to calculate the estimated failure of a component under given load conditions. Based on that calculation, the necessary service- and inspection intervals for a component are determined. Due to increasing requirements regarding accuracy and the consideration of material specific phenomena, the lifetime-prediction for elastomer components is focus of a number of current research works. Today, the accordance of calculated lifetime and observed failure in experiments is often inadequate.

That reveals the need of new models to predict the lifetime of elastomer components. Actual damage calculation, often based on methods that were proofed to work well applied to metal components, should not be the final state for elastomers. There is rather a need for models, which are tailored to their complex material properties. In this thesis the implementation of a new model for lifetime-prediction for dynamically loaded elastomer components is described. The calculated lifetimes are compared to experimental data that were recorded during dynamic long-term tests of flexible couplings.

By means of experimental test series, the new model is derived using a mathematical term for nonlinear damage calculation. The resulting damage of a load cycle is calculated considering the existing damage of the analysed component. Thus the known "long-term memory" of elastomer materials for previous load cycles is integrated into the new model. Two consecutive load cycles with an identically load do not cause an identical damage, because the existing damage of the second load cycle is major than the existing damage of the first one.

Furthermore the experimental test series are used to derive a short-term test routine for flexible couplings, which comprises a combination of a single level- and a load spectrum test. In this manner the free parameters of the mathematical term for nonlinear damage calculation can be calibrated with a minimum of required experimental effort.

The calculated lifetime-predictions using the example of flexible couplings are compared to the observed damage progress in experimental tests under several load sequences. The results of the predicted damage progress show a very good accordance with the observed failure of the tested components.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Martin Spitz

Martin Spitz
Lehrstuhl für Konstruktion und Kunststoffmaschinen
Universität Duisburg-Essen

Information

Free keywords: lifetime prediction, elastomer, nonlinear cumulative damage, flexible coupling, dynamic testing, power loss
Institute / chair: Fakultät für Ingenieurwissenschaften, Abteilung Maschinenbau und Verfahrenstechnik der Universität Duisburg-Essen
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Johannes Wortberg (Betreuer), Prof. Dr.-Ing. Edmund Haberstroh
Publication year: 2012
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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