Abstract
Sometimes the designer is doubtful whether the fascinating coloured pictures presented by a Finite-Element-analysis do reliably agree with reality. In particular this is becoming a problem when constructional elements are concerned which, for example, consist of PTFE-compounds the suppliers of which are unable to procure the relevant material properties. More often than not there is a lack of information on the stress-strain behaviour within the intended operating temperature range. In this case the user of a FE- program by himself and sometimes by costly experiments has to establish the necessary material properties. In this process it proved most effective on the one hand to experiment with a simply shaped specimen under load conditions similar to those of the
original component and, on the other hand, to apply the material properties measured by
setting up a FE-model of the specimen and performing an equivalent calculation. If there is satisfactory agreement of the results a reliable calculation of more complex constructional components is justified as weIl. In the paper the authors show how this
procedure was applied to calculate the radial sealing force of a complex PTFE-seal ring
under realistic mechanical and thermal conditions.
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