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Analysis of O-Ring Seal Failure under Static Conditions and Determination of End-of-Lifetime Criterion
Bundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany..
Bundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany..ORCID-id: 0000-0001-5079-2307
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.ORCID-id: 0000-0003-3049-7225
Bundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany..
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2019 (Engelska)Ingår i: Polymers, ISSN 2073-4360, E-ISSN 2073-4360, Vol. 11, nr 8, artikel-id 1251Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Determining a suitable and reliable end-of-lifetime criterion for O-ring seals is an important issue for long-term seal applications. Therefore, seal failure of ethylene propylene diene rubber (EPDM) and hydrogenated nitrile butadiene rubber (HNBR) O-rings aged in the compressed state at 125 degrees C and at 150 degrees C for up to 1.5 years was analyzed and investigated under static conditions, using both non-lubricated and lubricated seals. Changes of the material properties were analyzed with dynamic-mechanical analysis and permeability experiments. Indenter modulus measurements were used to investigate DLO effects. It became clear that O-rings can remain leak-tight under static conditions even when material properties have already degraded considerably, especially when adhesion effects are encountered. As a feasible and reliable end-of-lifetime criterion for O-ring seals under static conditions should include a safety margin for slight dimensional changes, a modified leakage test involving a small and rapid partial decompression of the seal was introduced that enabled determining a more realistic but still conservative end-of-lifetime criterion for an EPDM seal.

Ort, förlag, år, upplaga, sidor
MDPI , 2019. Vol. 11, nr 8, artikel-id 1251
Nyckelord [en]
EPDM, HNBR, seal failure, leak-tightness, DLO, oxygen permeability, DMA, indenter modulus
Nationell ämneskategori
Polymerkemi
Identifikatorer
URN: urn:nbn:se:kth:diva-261040DOI: 10.3390/polym11081251ISI: 000484552900021PubMedID: 31362423OAI: oai:DiVA.org:kth-261040DiVA, id: diva2:1356703
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QC 20191002

Tillgänglig från: 2019-10-02 Skapad: 2019-10-02 Senast uppdaterad: 2019-10-02Bibliografiskt granskad

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Pourmand, PayamHedenqvist, Mikael S.

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Jaunich, MatthiasPourmand, PayamHedenqvist, Mikael S.
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