자동차 냉각기 고무호스용 재질에 대한 신뢰성 평가 및 고장메커니즘규명Reliability Analysis and Failure Mechanisms of Coolant Rubber Hose Materials for Automotive Radiator
- Other Titles
- Reliability Analysis and Failure Mechanisms of Coolant Rubber Hose Materials for Automotive Radiator
- Authors
- 곽승범; 최낙삼; 신세문; 강봉성
- Issue Date
- Sep-2005
- Publisher
- 한국자동차공학회
- Keywords
- EPDM rubbers; Thermal oxidative aging; Electro-chemical degradation; Failure mechanisms; Coolant rubber hose; EPDM 고무; 열 및 산소 노화; 전기화학적 노화; 고장메커니즘; 냉매용 고무호스
- Citation
- 한국자동차공학회 논문집, v.13, no.5, pp.152 - 162
- Indexed
- KCI
- Journal Title
- 한국자동차공학회 논문집
- Volume
- 13
- Number
- 5
- Start Page
- 152
- End Page
- 162
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/46254
- ISSN
- 1225-6382
- Abstract
- Coolant rubber hoses for automobile radiators can be degraded and thus failed due to the influence of
contacting stresses of air and coolant liquid under the thermal and mechanical loadings. In this study, test analysis was carried out for evaluating the degradation and failure mechanisms of coolant hose materials. Two kinds of EPDM
rubber materials applicable to the hoses were adopted: commonly-used ethylene-propylene diene monomer(EPDM) rubbers and EPDM rubbers with high resistance against electro-chemical degradation (ECD). An increase of surface hardness and a large reduction of failure strain were shown due to the formation of oxidation layer for the specimens
which had been kept in a high temperature air chamber. Coolant ageing effects took place only by an amount of pure thermal degradation. The specimens degraded by ECD test showed a swelling behavior and a considerable increase in weight on account of the penetration of coolant liquid into the skin and interior of the rubber specimens. The ECD induced material softening as well as drastic reduction in strength and failure strain. However EPDM rubbers designed for high resistance against ECD revealed a large improvement in reduction of failure strain and weight. This study finally established a procedure for reliability analysis and evaluation of the degradation and failure mechanisms of EPDM rubbers used in coolant hoses for automobile radiators.
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