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Gasket life criteria at low temperatures adopting proportional compensation for loss of flexibility and conformability

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Abstract

In the automobile industry, the service life of gaskets is defined as the time until which a released gasket recovers 60 % of the original compression. It was observed that the recovery curves of gaskets were highly nonlinear at high temperatures, and relatively nonlinear at temperatures above the room temperature. However, it was also noted that the recovery curves of the gaskets at temperatures below room temperature exhibited linearity with respect to the ln(time). Automotive manufacturers demand gasket life criteria that exceed a specific time or the entire life of a car. In the case of gaskets used at lower temperatures, since materials encounter losses in its flexibility and conformability, the definition of service life specifying a 60 % recovery may not be sufficiently safe to eliminate possible leakages. In this study, new gasket life criteria that could be used at low temperatures were proposed. The new criteria were proposed based on the change in Young’s modulus of the gasket material in order to conserve the sealing capability.

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Abbreviations

R life :

life recovery corresponding to the temperature, %

K E :

modulus factor

E:

Young’s modulus, MPa

T:

working temperature, oC

Troom :

room temperature

Tlower limit :

lower limit of the working temperature (Jaunich et al., 2011)

n :

modulus ratio at working temperature

N :

modulus ratio at lower limit of working temperature

η :

severity indexh

t :

time, hr

DLO:

diffusion-limited oxidation

VMQ:

silicone rubber

ACM:

acrylic rubber

HALT:

highly accelerated life test

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Kwon, YD., Jun, SH., Han, JS. et al. Gasket life criteria at low temperatures adopting proportional compensation for loss of flexibility and conformability. Int.J Automot. Technol. 19, 99–106 (2018). https://doi.org/10.1007/s12239-018-0010-7

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  • DOI: https://doi.org/10.1007/s12239-018-0010-7

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