Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Degradation Behavior and Micro-Hardness Analysis of a Coolant Rubber Hose for Automotive Radiator

자동차용 냉각기 고무호스의 노화거동과 미소경도분석

  • 곽승범 (한양대학교 기게공학과) ;
  • 신세문 (한국화학연구원 신뢰성 평가센터) ;
  • 신외기 (평화산업(주)) ;
  • 최낙삼 (한양대학교 기계정보경영공학부)
  • Published : 2007.09.01
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Abstract

Rubber hoses for automobile radiators are apt to be 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 increased. On account of the penetration of coolant liquid into the skin part influenced by the electro-chemical degradation(ECD) test the weight of the rubber hose increased, whereas their failure strain and IRHD hardness decreased. The hardness of the hose in the side of the negative pole was the most deteriorated at the test site of the hose skin just below the coolant surface.

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References

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  1. Electrochemical degradation tests on a carbon-black-filled ethylene propylene diene monomer rubber under tensile strain pp.2041-2991, 2017, https://doi.org/10.1177/0954407017694412
  2. Electrochemical Combined-Stress Degradation Test and Failure Mechanisms of EPDM Rubber for Automotive Radiator Hoses vol.37, pp.1, 2013, https://doi.org/10.3795/KSME-A.2013.37.1.001