Analysis of O-Ring Seal Failure under Static Conditions and Determination of End-of-Lifetime Criterion

Koemmling, AnjaBundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany. (författare)

QC 20191002
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.

Jaunich, MatthiasBundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany. (författare)
Pourmand, PayamKTH,Fiber- och polymerteknologi(Swepub:kth)u1v951wj (författare)
Wolff, DietmarBundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany. (författare)
Hedenqvist, Mikael S.KTH,Fiber- och polymerteknologi(Swepub:kth)u10rkaxe (författare)
Bundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany.Fiber- och polymerteknologi (creator_code:org_t)

Av författaren/redakt...: Koemmling, Anja; Jaunich, Matthia ...; Pourmand, Payam; Wolff, Dietmar; Hedenqvist, Mika ...

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