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International Journal of Automotive Technology

, Volume 19, Issue 1, pp 99–106 | Cite as

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

  • Young-Doo Kwon
  • Seong-Hwa Jun
  • Jin-Sik Han
  • Dong-Jin Lee
Article
  • 81 Downloads

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.

Keywords

Gasket Life criteria Low temperature Recovery Conformability 

Nomenclature

Rlife

life recovery corresponding to the temperature, %

KE

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

Subscripts

DLO

diffusion-limited oxidation

VMQ

silicone rubber

ACM

acrylic rubber

HALT

highly accelerated life test

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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag GmbH Germany 2018

Authors and Affiliations

  • Young-Doo Kwon
    • 1
  • Seong-Hwa Jun
    • 2
  • Jin-Sik Han
    • 3
  • Dong-Jin Lee
    • 3
  1. 1.School of Mechanical Engineering & IEDTKyungpook National UniversityDaeguKorea
  2. 2.Institute of Engineering Design and TechnologyKyungpook National UniversityDaeguKorea
  3. 3.Research AssistantKyungpook National UniversityDaeguKorea

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