Modelling of Metallic Sealing Seats

 

Metallic sealing seats often take over safety-relevant functions in hydraulic applications. Despite their frequent use and seemingly simple design, it is still not possible to correctly predict the leakage that will occur as a function of the design and operating parameters of hard sealing seats. The aim of the study is to develop a scientifically founded understanding of the sealing behaviour of metallic seal seats by modelling.

 
Benefit Procedure
Scientific understanding of metallic seal seats Simulation modeling of macrodeformation and microdeformation
Prediction of leakage at hard sealing contact points Linking and analysis of the simulation models
Validation of the simulation models Test bench development to determine the real valve behaviour

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Modelling for Macrodeformation and Microdeformation of Hard Sealing Contacts

Simple geometries are considered at the beginning of the modelling process. The complexity is subsequently increased until the real valve behaviour can be represented. Macrodeformation is used to analyze how the contact bodies deform under the influence of contact force and time and how this affects the resulting leakage flow.

The simulation model of the microdeformation includes the analysis of the material structure changes on microscopic level at the contact of metallic bodies.

The combination of the two models results in a simulation model which realistically simulates the contact mechanics of metallic, hard-sealing contacts. The model is subsequently validated by test bench results.

 

Development of a Test Bench for Validation of the Simulation Results

FEM of the Sealing Contact of a Sphere

The development of the test bench is carried out under consideration of the findings that can be represented by the simulation. In order to obtain scientifically meaningful results, the selection and positioning of the measurement technology is of decisive importance. In addition, the positioning of the sealing body and the sealing seat to each other is of particular importance. The reproducible manufacturing quality of the sealing bodies should also not be neglected. A spherical shape and a sealing seat with a tapered bore are selected as sealing elements.

 

Acknowledgement

Copyright: DFG  

The research project is funded by the German Research Foundation. It is a joint project that ifas is conducting together with the Peter Grünberg Institute (PGI) of Forschungszentrum Jülich.