Characteristics of Elastomer Seals Exposed to Space Environments

Daniels, Christopher C.; deGroh, Henry C.; Dunlap, Patrick H.; Finkbeiner, Joshua R.; Steinetz, Bruce M.; Bastrzyk, Marta B.; Oswald, Jay; Banks, Bruce A.; Dever, Joyce A.; Miller, Sharon K.; Waters, Deborah L.

doi:10.2514/6.2007-5741

Cited by 31 publications

(8 citation statements)

References 6 publications

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“…[1][2][3][4] In many cases, these loads are beyond the push-off capabilities of planned docking system separation mechanisms. However, these same studies also showed that pre-treatment of the seals with low doses (e.g., 1x10 20 atoms/cm 2 ) of atomic oxygen (AO) drastically reduced seal adhesion loads without adversely affecting seal compression loads or leak rates.…”

Section: Figure 2 Cross Sections Through the Interface Between Two Mmentioning

confidence: 98%

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Durability Testing of Docking System Seals for Space Applications

Dunlap¹,

Martin²,

Garafolo³

et al. 2011

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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NASA is developing a new docking system to support future space exploration missions to low-Earth orbit, the Moon, and other destinations. This system will be used to dock future vehicles with the International Space Station or with each other. A key component of this system is the seal at the main docking interface which inhibits the loss of cabin air once docking is complete. Depending on the mission, the seal must be able to dock in either a sealon-flange or seal-on-seal configuration. Seal-on-flange mating occurs when a docking system equipped with a seal docks to a system with a flat metal flange. This would occur when a vehicle docks to a node on the International Space Station. Seal-on-seal mating occurs when two docking systems equipped with seals dock to each other. During and after the docking process, the seals will be subjected to scrubbing, or sliding, at the docking interface due to mechanical and thermal movements. To evaluate the effects of scrubbing on seal performance, durability tests were performed on subscale docking system seals manufactured from two candidate silicone elastomer compounds. These tests were performed under anticipated worst-case conditions of seal-on-flange mating at warm temperatures while under high compression levels. Seal performance was evaluated via leak and adhesion tests before and after the durability tests. Leak testing revealed no statistical differences in seal leak rates before and after durability testing. However, adhesion testing of the seals before and after the durability tests indicated that seal scrubbing during a mission could lead to increased adhesion during undocking. Nomenclature a 0 = initial mass of control volume during leak test a 1 = slope of linear regression curve corresponding to seal leak rate m = mass p = absolute pressure V = volume of air in test section R = gas constant t = time T = absolute temperature

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Section: Figure 2 Cross Sections Through the Interface Between Two Mmentioning

confidence: 98%

“…Nomenclature a 0 = initial mass of control volume during leak test a 1 = slope of linear regression curve corresponding to seal leak rate m = mass p = absolute pressure V = volume of air in test section R = gas constant t = time T = absolute temperature…”

mentioning

confidence: 99%

Durability Testing of Docking System Seals for Space Applications

Dunlap¹,

Martin²,

Garafolo³

et al. 2011

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

Self Cite

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show abstract

“…The leak rate values of all four the these seal designs have been characterized. 14,15 The mechanical performance of each elastomer seal design is presented in this paper and the obtained results, in combination with previous material characterization tests performed on the same elastomer compounds, [11][12][13][14][15] will be extrapolated to predict full-scale system seal performance.…”

Section: 10-14mentioning

confidence: 99%

The Mechanical Performance of Subscale Candidate Elastomer Docking Seals

Bastrzyk

Daniels²

2010

51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials ConferenceSelf Cite

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“…Compression set values of the S0899-50 compound were lower than the S0383-70 compound values; however, the S0899-50 compound is known to have adhesive tendencies (ref. 5), and the influence of adhesion on these compression set measurements was not quantified. …”

Section: A Compression Set and Adhesion Testingmentioning
confidence: 99%

Experimental Investigation of Elastomer Docking Seal Compression Set, Adhesion, and Leakage
Daniels
¹
,
Oswald
²
,
Bastrzyk
³

et al. 2007
AIAA SPACE 2007 Conference &Amp; Exposition
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Characteristics of Elastomer Seals Exposed to Space Environments

Cited by 31 publications

References 6 publications

Durability Testing of Docking System Seals for Space Applications

Durability Testing of Docking System Seals for Space Applications

The Mechanical Performance of Subscale Candidate Elastomer Docking Seals

Experimental Investigation of Elastomer Docking Seal Compression Set, Adhesion, and Leakage

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