Service life of seals – numerical simulation in sealing technology enhances prognoses

Achenbach, M.

doi:10.1016/s0927-0256(00)00157-9

Cited by 26 publications

(12 citation statements)

References 2 publications

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“…The time-dependent formation of a new molecular network by simultaneous scission and cross linking and changes in O-ring strain energy state were used as the basis for explaining compressive set by Achenbach. 7…”

Section: Related Researchmentioning

confidence: 99%

Improved elastomeric seal design based on nonhomogeneous material properties

Matus

Klamecki

2012

Proceedings of the Institution of Mechanical Engineers, Part L:

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The goal of this research was improving elastomeric seal performance based on seal material design. The specific seal failure mode considered was permanent deformation or compression set of O-rings, and sealing performance degradation due to this process is common to all types of elastomeric seals. The basis for seal design was identified as reducing the elastic strain energy in the seal since it drives the growth of permanent material deformation. The design concept developed was using variation of material behavior over the seal section to manipulate the level and distribution of elastic strain energy. Design studies used finite element analyses with experimentally measured material behavior to quantify effects of varying seal material characteristic on seal performance. Sealing performance was described in terms of compression set and seal-counterface contact pressure. Experimental O-rings were produced based on designs that included regions of less stiff material in the larger surrounding seal section. Performance of new design seals was compared to conventional one-material seals and improved sealing performance was demonstrated. With the modified design seals, both compression set and the rate of sealing contact pressure loss over time were decreased. There was a loss of initial maximum contact pressure with the inclusion of less stiff material regions, but it was shown that this effect can be mitigated by properly locating the softer material in the overall seal section. In summary, properly implemented material variations over the seal will result in lower strain energy content, lower rate of permanent deformation development and decreasing rate of loss of seal-counterface contact pressure.

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Section: Related Researchmentioning

confidence: 99%

Improved elastomeric seal design based on nonhomogeneous material properties

Matus

Klamecki

2012

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…The hardness value of the initial-state insulator is Shore A 55 and that of the failed insulator is Shore A 69, indicating a difference of +14. The insulator degradation was caused by the heat (of the engine and the air) and the repeated loads [12][13][14]. An experiment was conducted to measure the insulator's temperature changes during driving and stopping.…”

Section: Lab-based Noise Reproduction Experiments In a Strut Module Statementioning

confidence: 99%

Study on durability and reliability of strut type suspension noise based on experimental methods

et al. 2012

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When cars are released from the factory, strut noises are very small and therefore it is difficult to perceive them. As the use time and travel distance increase, however, strut noises get larger so as to cause users much uneasiness. The noises generated at the field include engine noises and flow noises and therefore it is difficult to clearly discern the noises generated from struts. This study developed a test method which can reproduce field strut noises in the lab. Using the newly developed noise evaluation test, this study analyzed the effects that insulator performance degradation and failure can have on car noises. The study also confirmed that the insulator durability test by the simple back-and-forth motion cannot completely reflect the state of the parts failure in the field. Based on this, the study also confirmed that field noises can be reproduced through a durability test that considers heat aging.

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“…The following is based on an ageing model described in detail elsewhere [16,17]. This model is most simply explained by the schematic diagrams in Figure 17.…”

Section: The Ageing Modelmentioning

confidence: 99%

Comparison of the Sealing Function of Co- and Terfluoropolymer Materials

Streit

Duarte

Achenbach

2005

International Polymer Science and Technology

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Elastomeric sealing materials based on fl uorinated polymers are the most thermally stable elastomers for elastic sealing materials. The diversity of this class of polymers has increased enormously especially in the last two decades. Nevertheless, copolymers and terpolymers which were developed in 1950s, still account for the overwhelming majority. There are differences in both the temperature-dependent deformation behaviour, particularly in the cold, and the thermal stability. Both factors are infl uenced in different ways by the degree of fl uorination. While copolymers are more fl exible at low temperatures, terpolymers have better thermal stability. This article describes the effects of these different properties on a sealing system and then discusses the impacts of thermal stress on the expected service life.

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Service life of seals – numerical simulation in sealing technology enhances prognoses

Cited by 26 publications

References 2 publications

Improved elastomeric seal design based on nonhomogeneous material properties

Improved elastomeric seal design based on nonhomogeneous material properties

Study on durability and reliability of strut type suspension noise based on experimental methods

Comparison of the Sealing Function of Co- and Terfluoropolymer Materials

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