Static Cold Sealing Force Behaviour of Amorphous Hnbr Materials

Hornig, R.; Sunder, J.; Herr, B.

doi:10.1177/0307174x1203901101

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…6a. The O-ring sealing force decays with cooling to nearly zero at a variable decay rate which reaches a maximum at about −10 • C. A similar behaviour of force decline during cooling at low temperatures was noticed earlier in fluoroelastomer [5,7,6] and HNBR [22,14] seals. In addition, experiments were carried out on CB filled O-rings, and the effect of filler on the sealing force is quite apparent here.…”

Section: Resultssupporting

confidence: 72%

Interfacial leakage of elastomer seals at low temperatures

Akulichev

Echtermeyer

Persson

2018

International Journal of Pressure Vessels and Piping

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Interfacial leakage of air in hydrogenated nitrile butadiene rubber (HNBR) O-ring seals exposed to sub-ambient temperatures is studied. Flange-type fixtures with sealing surfaces produced by 3 different surface finish processes are used. When the seals are cooled down to temperatures below the elastomer glass transition point T g of (−23 • C), an abrupt increase of air leakage (> 10 −2 cm 3 /min) is observed. The effects of surface finish conditions, compression ratio, grease lubrication and additions of carbon black in the HNBR on the cold leakage are discussed. Persson's contact mechanics and effective medium leakage theory coupled with finite element analysis (FEA) of the HNBR seals are utilized to capture the changes in the contact area and pressure with cooling and predict the seal failure temperatures. The main cause for the cold seal failures is believed to be the detachment of the elastomer seals from their mating sealing parts due to the elastomer thermal contraction and the negligible recovery of the HNBR in cold environment. In addition, the adhesive rubber-substrate interface influences the detachment and seal failure.

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Section: Resultssupporting

confidence: 72%

Interfacial leakage of elastomer seals at low temperatures

Akulichev

Echtermeyer

Persson

2018

International Journal of Pressure Vessels and Piping

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“…This property is of great importance for fluid retaining seals made of such elastomers that are utilised in engineering equipment ex- gas applications. Performance of elastomer seals in cold environment received scientific attention over the last 30 years which resulted in several publications dealing with static [4,5,6,7,8,9,10,11,12,13,14] and dynamic [15,16] applications. Recent experiments with leakage of static seals at low temperatures demonstrated that the cold seal failures are generally caused by the gaps which open due to the thermal contraction mismatch between the elastomer and metal components during cooling [13,14].…”

Section: Introductionmentioning

confidence: 99%

HNBR elastomer composite with zero thermal contraction over a range of temperatures

Akulichev

Alcock

Протасов

et al. 2019

Composites Communications

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Elastomers such as hydrogenated nitrile butadiene rubber (HNBR) are known to have inferior dimensional stability upon temperature changes compared to metallic materials. This can result in thermal contraction mismatches between metal and elastomer sealing components during cooling, possibly leading to seal leakage. It has also been reported that MnCoGe alloys have been developed that undergo a phase change which results in a volumetric expansion during cooling through the phase change temperature region. This article reports the effect of adding MnCoGe-alloy particles into a HNBR elastomer with the purpose using the thermal expansion of the alloy particles to counteract the thermal contraction of this elastomer during cooling. The composite material is produced using a combination of solvent casting and traditional shear mixing in a two-roll mill followed by compression moulding. With the MnCoGe volume fraction of ≈ 17 %, a considerable suppression of the thermal expansion coefficient of the base elastomer was achieved, going from 185 × 10 −6 • C −1 to nearly zero in the range of temperatures from -5 • C to +15 • C. The positive effect of the filler on the thermal expansivity was apparent in wider temperature range of -20 to +40 • C.

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Static Cold Sealing Force Behaviour of Amorphous Hnbr Materials

Cited by 2 publications

References 20 publications

Interfacial leakage of elastomer seals at low temperatures

Interfacial leakage of elastomer seals at low temperatures

HNBR elastomer composite with zero thermal contraction over a range of temperatures

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