Proceedings of the Korean Reliability Society Conference (한국신뢰성학회:학술대회논문집)

The Korean Reliability Society (한국신뢰성학회)
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Characteristic Accelerated Aging Assessment for Coolant Rubber Hose of Automotive Radiator

자동차 냉각기 고무호스의 가속 노화거동 평가

  • Kwak, Seung-Bum (Department of Mechanical Engineering, Graduate School Hanyang University) ;
  • Choi, Nak-Sam (Department of Mechanical Engineering, Hanyang University) ;
  • Kang, Bong-Sung (Department of Mechanical Engineering, Hanyang University) ;
  • Shin, Sei-Moon (Reliability Assessment Center, Korea Research Institute of Chemical Technology)
  • Published : 2006.05.18
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Abstract

Rubber hoses for automobile radiators are apt to degraded and thus failed due to the influence of contacting stresses of air and coolant liquid under thermal and mechanical loadings. The aging behaviors of the skin part of the hoses due to thermo-oxidative and electro-chemical stresses were experimentally analyzed. Through the thermo-oxidative aging test, it was shown that the surface hardness IRHD(International Rubber Hardness Degrees) of the rubber increased with a considerable reduction of failure strain as the aging time and temperature were large. On account of the penetration of coolant liquid into the skin part the weight of rubber specimens influenced by electro-chemical degradation (ECD) test increased, whereas their failure strain and IRHD hardness decreased. The hardness decreased further as the test site on the hose skin approached to the negative pole.

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