Abstract
The increasing demands on radial shaft seals have in recent years led to the replacement of traditional elastomer seals by chemically and thermally more stable seals made of compounded polytetrafluorethylene. With the increasing use of finite element analysis, there is a concurrent demand for robust material models and material data for the PTFE compounds used. Due to their complex mechanical material behaviour these models and data are not available in sufficient quality.
Extensive research work has been conducted in the field of material behaviour of PTFE compounds. Based on this research, material models have been developed for a typical carbon filled PTFE compound and implemented in the finite element analysis. The material models were applied to simple tensile tests and various PTFE shaft seals, then compared with measurements and thus verified.
On the basis of material tests, material models for PTFE compounds were developed and implemented in finite element analysis. Comparisons with measured seals confirmed the validity of the material models. Resulting from this work, there are now models at our disposition enabling us to test a multiplicity of function critical sealing characteristics using finite element analysis. Finite element analysis can therefore be efficiently used for the development of PTFE shaft seals.
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