pps proceeding - Abstract Preview
pps proceeding
Symposium: Rheology & Advanced Characterization
Poster Presentation
 
 

Fretting tests for elastomeric sealing materials

Hausberger Andreas (1)*, Tockner Martin (1), Berer Michael (1), Godor Istvan (2), Schwarz Thomas (3)

(1) Polymer Competence Center Leoben GmbH - Styria - Austria, (2) Chair of Mechanical Engineering, Montanuniversitaet Leoben - Styria - Austria, (3) SKF Sealing Solutions Austria GmbH - Styria - Austria

important failures that can occur: A fretting failure at the seal with crack growth under the surface or the so called fretting corrosion on the metallic shaft. In the literature three different fretting regimes are well described: The stick-, partial- and gross slip region. The quantification of the fretting regimes is done using a running condition fretting map (RCFM) or a material response fretting map (MRFM). These maps are detailed documented for steel. On the other hand there is almost no data available for polymers and especially for elastomers. Hence, the goal of our work is to fill that gap. In the recent work an existing tribological test set-up was adapted for a fretting test method (ball on plate). Based on previous research an extended test procedure was established to quantify the fretting regimes. For the method development a standard HNBR type intended for seal-application was used. A broad range of test parameters (frequency, load and amplitude) were used to visualise the fretting regions. Additionally, the analysis combined with two further calculated parameters: the “cumulated dissipated energy” and the “measured wear volume” for better interpretation. The first results show a very good applicability of the test method for the evaluation of the different fretting regimes. Both, a RCFM and a MRFM were drawn for HNBR. Furthermore, additional parameters like “wear volume” and “cumulated dissipated energy” are very sensitive indicators for the exact determination of the different fretting states. This test method is suitable to improve material properties in fretting dominated contacts.