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최낙삼(NakSam Choi),곽승범(SeungBum Kwak),신세문(SeiMoon Shin),강봉성(BongSung Kang),신외기(WaeGi Shin) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Coolant rubber hoses for automobile radiators co 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. 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 hardly took place, which corresponded to only the pure thermal degradation. The degraded specimens by electro-chemical degradation (ECD) test showed a swelling behavior and a considerable increase in weight oil account of the penetration of coolant liquid into the skin and interior of rubber. The ECD induced material softening and fatal decreases in strength and failure strain. A procedure fur reliability analysis and evaluation of the degradation and failure mechanisms of FPDM rubbers used in coolant hoses for automobile radiators was proposed.
이성혁(SungHyuk Lee),최낙삼(Naksam Choi) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, the bending collapse behaviors of reinforced aluminum square tube beams by means of aluminum plates under three point bending loading have been evaluated. A finite element simulation for the three-point bending test has been performed. Three kinds of reinforced aluminum tube beam specimens were employed. The maximum bending load and the bending behaviors in the elastic region obtained from the numerical simulation were in good agreement with experimental results. After the maximum load, aluminum plate was separated from an aluminum tube beam. To predict energy absorption capability of reinforced tube beams, numerical simulation and Kecman theory were performed. An aluminum tube beam strengthened on the upper web by aluminum plate with a width of 20㎜ showed a good result.