Fuel Permeation Testing - Configurations, Methods, and Correlations

Tuckner, Paul

doi:10.4271/2001-01-1126

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Recent studies have used discs of diameter lower than 30 mm and washers of outer diameter lower than 42 mm. 6,13,14 The use of a reduced sized sample could have the following problems: 1) the difference of shape could lead to different stress responses to compression; 2) the different exposure area-to-total surface area ratio to atmosphere could lead to a different degradation rate; 3) data could be rendered unreliable as a diminutive specimen may have a different degree of crosslinking from an actual O-ring.…”

Section: Introductionmentioning

confidence: 98%

Life-time prediction of a chloroprene rubber (CR) O-ring using intermittent compression stress relaxation (CSR) and time-temperature superposition (TTS) Principle

et al. 2011

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Intermittent compression stress relaxation (CSR) testing was used to examine the degradation of a large scale chloroprene rubber (CR) O-ring, rather than a reduced scale copy, as well as predict its life-time. An intermittent CSR jig was designed by considering the O-ring's environment during use. The testing allowed the observation of the effects of friction, heat loss and stress relaxation by the Mullins effect. Degradation of O-rings by thermal aging was observed between 40 and 120 o C. In the high temperature range of 80-120 o C, the O-rings exhibited linear degradation behavior and satisfied the Arrhenius relationship. The activation energy was approximately 72.7 kJ/mol. From the Arrhenius plots, the predicted life-times were 22.8 years and 34.5 years for the 50% and 40% failure conditions, respectively. Using the time-temperature superposition (TTS) principle, full predictions of failure at 40 o C could be made, saving considerable testing time. Between 40 and 80 o C, the activation energy decreased to 58.9 kJ/ mol. William-Landel-Ferry (WLF) plotting confirmed that the O-rings show non-linear degradation behavior under 80 o C. The life-time of the O-rings predicted by the TTS principle was 11.1 years and 18.1 years for each failure condition. The life-time predicted by the TTS principle was more conservative than that from the Arrhenius relationship.

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Section: Introductionmentioning

confidence: 98%