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정재윤(Jae-Yun Jeong),박정호(Jung-Ho Park) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11
본 논문은 알루미늄 함량 변화에 따른 추진제의 후경화에 대한 영향성, 화학적 노화도에 관하여 기술하였다. 동일 경화조건에서 알루미늄 함량이 18 wt%인 추진제가 2 wt%인 추진제 대비 후경화 기간이 길어지는 것을 확인하였다. 반면 후경화가 포함된 화학적 노화도 분석에서는 알루미늄 함량이 18wt%인 추진제가 2 wt%인 추진제 대비 화학적 노화가 천천히 진행되는 것을 확인하였다. In this report, the post-curing and chemical aging ratio of propellants are described according to several aluminum contents. Under the same curing conditions, it was confirmed that the post-curing period of propellant having the aluminum content of 18 wt% was longer than the propellant having the 2 wt% of aluminum. On the other hand, in the chemical aging ratio analysis including post-curing, the propellant having the 18 wt% of aluminum was confirmed that the chemical aging proceeds slowly compared to the propellant having an aluminum content of 2 wt%.
곽승범(Seung-Bum Kwak),최낙삼(Nak-Sam Choi),신세문(Sei-Moon Shin),신외기(Wae-Gi Shin) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
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.
정재윤(Jae-Yun Jeong),박정호(Jung-Ho Park) 한국추진공학회 2020 한국추진공학회지 Vol.24 No.4
In this report, the post-curing and chemical aging ratio of propellants are described according to several aluminum contents. Under the same curing conditions, it was confirmed that the post-curing period of propellant having the aluminum content of 18 wt% was longer than the propellant having the 2 wt% of aluminum. On the other hand, in the chemical aging ratio analysis including post-curing, the propellant having the 18 wt% of aluminum was confirmed that the chemical aging proceeds slowly compared to the propellant having an aluminum content of 2 wt%.
황영은(Youngeun Hwang),오진오(Ohjin Oh),윤성호(Sungho Yoon) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
본 연구에서는 기존의 접착제를 대체용 접착제로 대체 가능한지의 여부를 조사하기 위하여 구조용 접착제에 대해 일련의 열화 시험을 수행하였다. 구조용 접착제는 온도, 수분, 자외선 등의 자연환경 조건을 모사할 수 있는 가속노화시험기를 통해 복합적인 환경인자에서 1000시간 동안 노출시켰다. 구조용 접착제의 기계적 특성은 하중 시험기를 통해, 화학적 특성은 적외선 분광 분석 장치를 통해 평가하였다. 연구결과에 따르면 대체용 접착제가 환경인자에 노출될 경우 기존의 접착제에 비해 안정적이기 때문에 기존의 접착제는 대체용 접착제로 대체 가능할 것으로 판단하였다. In this study, a series of degradation test for structural adhesives was performed to investigate the possibility of replacement of the alternative adhesives to the conventional adhesives. Four types of the adhesives were exposed to combined environmental conditions over 1000 hours at an accelerated aging tester, which can simulate natural weather conditions such temperature, moisture and ultraviolet. Mechanical and chemical properties of the adhesives were evaluated through material testing system and FT/IR spectrometer. According to the results, the conventional adhesives can be replaced by the alternative adhesives because the alternative adhesives were more stable to environmental conditions rather than the conventional adhesives.
곽승범(Seung-Bum Kwak),최낙삼(Nak-Sam Choi),최윤정(Youn-Joung Choi),신세문(Sei-Moon Shin) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.8
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, for the EPDM rubber conventionally used as a radiator hose material the aging behavior of the skin due to thermo-oxidative and electro-chemical stress was evaluated. Through the thermo-oxidative aging test, it was found that the surface hardness, IRHD of the rubber increased with a considerable reduction of failure strain. On account of the penetration of coolant liquid into the skin the weight of rubber specimens degraded by the ECD test increased, whereas their failure strain and IRHD hardness decreased largely. The penetration of coolant liquid into the specimen caused some changes in inner structure and micro hardness distribution of the rubbers.