Ensuring tightness of metal-polymer joins of hydropneumatic systems

DOI

10.2991/avent-18.2018.60How to use a DOI?

Keywords

tightness; metal-polymer joins; relative contact area; gap density in the joint; probability of a medium flowing

Abstract

The issues of ensuring of guaranteed, with a given probability of the flow of the medium, the tightness of metalpolymeric sealing joints of the hydraulic systems of apparatuses and units are considered. Taking into account the mutual influence of the microasperities of the rough surface, the dependences of the relative contact area, the gap density in the joint and the probability of the medium flowing from the dimensionless force elastic geometric parameter fq are determined. These contact characteristics determine the functional of the permeability Cu which characterizes the sealing capacity of the sealing joint. Their role in various periods of loading of a sealing joint by a dimensionless load is shown. By the dependence of the functional of the permittivity Cu on the dimensionless force elastic geometric parameter fq, it is possible to distinguish three zones of sealing: initial, due to the indentation of the highest asperities; stable, by reducing the gap density; effective, due to the fusion of individual contact spots. It is shown that due to the fusion of single contact spots at fq > fqe, the probability of the medium flowing sharply decreases. For the probability value uk = 0.0001, the values fqe = 0.50…0.60 which corresponds to the relative contact area h= 0.58…0.63. This result agrees well with the value of the relative actual contact area obtained using percolation theory, in which a continuous closed cluster is formed, i.e. overlapping of all microchannels in the joint is ensured.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - P. Ogar
AU  - D. Gorokhov
AU  - L. Mamaev
AU  - V. Fedorov
PY  - 2018/05
DA  - 2018/05
TI  - Ensuring tightness of metal-polymer joins of hydropneumatic systems
BT  - Proceedings of the International Conference "Aviamechanical engineering and transport" (AVENT 2018)
PB  - Atlantis Press
SP  - 313
EP  - 318
SN  - 2352-5401
UR  - https://doi.org/10.2991/avent-18.2018.60
DO  - 10.2991/avent-18.2018.60
ID  - Ogar2018/05
ER  -