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- 주제어 : Thermal Resistance(내열성) (검색결과 8 건)
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박정배(Jeongbae Park),이범철(Beomcheol Lee),박성한(Sunghan Park),민성기(Seongki Min) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
고속 비행체의 연료탱크는 기체에서 연료탱크로의 외부 열전달로 인한 연료의 급격한 온도상승 문제가 발생할 수 있다. 따라서 고속 비행체의 연료탱크에 장착되어 외부 고온의 열이 연료로 전달되는 것을 최소화 할 수 있는 제품의 개발이 필요하다. 본 논문에서는 연료탱크에 장착이 가능하고 내열 및 내유성이 있으며 기체의 팽창에도 견딜 수 있는 탄성을 가진 고무복합체를 개발하였고, 그 구성은 고무층, 보강포, 내유성을 가진 필름, 내열성 접착체로 이루어져 있다. 개발된 고무복합체는 개발 시험을 통해 20℃ 기준에서 30년의 수명을 가지는 것을 확인하였고, 400℃의 운용시험 후 시편 검사에서 외형 및 열전도도 성능에 이상이 없음을 확인하였다. The fuel tank of high speed aircraft has a rapid temperature rise due to outside heat transfer. Therefore, it is necessary to develop the products to minimize the rapid temperature rise of heat to the fuel. This study has developed a rubber composite which has thermal and oil resistance. Also it has elasticity to endure expansion of aircraft body. The rubber composite consists of a rubber layer, reinforcement fiber, a film of oil resistance and a the rmal resistance adhesive. Through the development verification test it has been confirmed that the average life span of the rubber composite is more than 30 years at 20℃ and there is nothing wrong with shapes and thermal conductivity at a specimen test.
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홍채환(Chaehwan Hong),최치훈(Chihoon Choi),한도석(Dosuck Han) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Polylactic acid or polylactide (PLA) is a biodegradable, thermoplastic, aliphatic polyester derived from renewable resources, such as corn starch or sugarcanes. Although PLA has been known for more than a century, it has only been of commercial interest in recent years. They have been used as biomedical materials for tissue regeneration, matrices for drug delivery systems, and alternatives for commercial polymeric materials. However, there is one of the drawbacks of PLA, which is the low melting temperature property and it is expected that stereocomplexation would be a solution to overcome this. Stereocomplexation enhances the mechanical properties, the thermal-resistance, and the hydrolysis-resistance of PLAbased materials. These improvements arise from a peculiarly strong interaction between L-lactyl unit sequences and D-lactyl unit sequences, and stereocomplexation would open a new way for the application of PLA for interior, exterior materials for automotive.
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서울·연변간 착의실태 조사분석 : 착의량을 중심으로 Focusing on the clothing weight
이원자,오순 한국의류학회 1999 한국의류학회지 Vol.23 No.7
In order to find out the influences upon not only the thermal resistance of human body but also the clothing action and the clothing weight, which are caused by the differences in the thermal living conditions by using air conditioner and so on, to adapt themselves to the changes of their residential environment according to the changes of seasons, we investigated the clothing practices upon the male and female students in Seoul and Korean male and female students in Yanbian who are estimated to have different thermal living conditions in spite that they are same folk as well as living in the same age. 1. The total clothing weight of body surface erea was increased in order of summer, autumn, spring and winter seasons and by seasons, the changes of the clothing weight were found in both areas. In Seoul, the changes of upper outwear clothing weight were found on both sexes but in Yanbian, the changes of underwear weight were found on both sexes. And the underwear weight of both sexes in Seoul was lighter than that of both sexes in Yanbian. 2. Those in Seoul tended to fell colder in winter and hotter in summer than those in Yanbian on account that the formers are more sensitive of thermal conditions than the latters. 3. Comparing clo-value calculated by the fomula of 稻垣 with the Winslow's clo-value, those in Yanbian had higher thermal resistance than those in Seoul. Consequently, those in Seoul adapted themselves to the seasons by controling the upper outwear weight but those in Yanbian did it with underwear weight. The male and female students in Seoul, tended to feel colder in winter and hotter in summer than those in Yanbian because the thermal sense of the former is more sensitive than that of the latter.
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불소 고무복합체의 저온과 고온촉진노화 특성에 대한 비교 연구
박정배(JeongBae Park),이범철(BeomCheol Lee),정윤석(YoonSeok Jeong),박성한(SungHan Park) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
내열 및 내유성 고무복합체 특성연구(The study on the thermal and oil resistance rubber composite), 2016.[6] 연구에서는 고온(150℃, 175℃, 200℃) 조건의 고온촉진노화를 통하여 불소고무 복합체의 수명을 예측하였다. 일반적인 고무제품은 온도, 습도, 오존, 빛, 유제, 기계 및 전기적 응력 등의 특성저하 인자에 따라 다른 특성을 나타낼 가능성이 있으며, 이러한 문제를 해결하기 위하여 "내열 및 내유성 고무복합체 특성연구"[6] 연구에서 얻어진 고온촉진노화에 의한 수명 예측값과 저온촉진노화간의 인장강도 변화율 및 신장률 변화율 그리고 부피 변화율, 무게 변화율, 두께 변화율 및 열전도도를 비교 검토하였다. 검토 결과, 요구 한계수명은 모두 만족하였지만 고온촉진노화 결과와 저온촉진노화 결과 간 변화율에서 약간의 격차를 보였다. 이러한 변화율 격차가 일어나는 원인은 고온촉진노화에서는 노화 시 불소고무의 주사슬 분해로 인하여 인장강도, 신장률 감소 및 부피, 무게, 두께 증가가 일어나는데 비해 저온촉진노화에서는 80℃에서 불소고무의 지속적 경화반응으로 인하여 인장강도, 신장률 및 부피, 무게, 두께 변화가 적게 나타났을 것으로 판단된다. The study on the thermal and oil resistance rubber composite, 2016. [6] predicted the lifetime of Fluorocarbon Rubber by accelerating aging at high temperature (150 ℃, 175 ℃, 200 ℃). general rubber products are likely to exhibit different properties depending on the degradation factors such as temperature, humidity, ozone, light, emulsion, mechanical and electrical stress. To solve these problems, We compared the rate of change about tensile strength, elongation rate, volume change rate, weight change rate, thickness change rate, thermal conductivity in low temperature promoting aging on the basis of predictive lifetime of high temperature promoting aging. As a result of the review, the required life expectancy was satisfied, but there was a slight difference in the rate of change between the high-temperature promoted aging life result and the low temperature promoted aging life result. The cause was a reduction in "tensile strength / elongation" and an increase in "volume / weight / thickness" caused by the main chain decomposition of fluorine rubber due to aging at high temperature promoting aging. However, the low temperature promoting aging was caused by the curing reaction of fluorine rubber at 80 ° C. The tensile strength / elongation and volume / weight / thickness changes were small.
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임충환(Choonghwan Lim),구병춘(Byeongchoon Goo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In the disk braking of the railway trains or automotive vehicles, kinetic energy of the vehicle is converted into thermal energy by friction between a brake disk and the pad materials. The thermal cracks that initiated on brake disk surface by friction heating have a seriously bad effect on brake performance and maintainability for disk-pad brake systems. In this study, we show the comparative thermal fatigue test procedure and thermal crack analysis process to evaluate the thermal fatigue characteristics of candidate materials designed for development of heat-resistant brake disk material. We carry out the test for 5 newly developed materials then we comparatively analyze the thermal crack initiation and propagation to each specimen. As a result, we decide the best heat-resistant material by those test procedure and analysis process.
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칼슘설포알루미네이트 시멘트의 탄산화 양생과 열 안정성에 관한 검토
오현유 ( Wu Xuanru ),쿠날크뤼쉬나다스 ( Kunal Krishna Das ),장정국 ( Jang Jeong Gook ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In recent decades, climate change has become an issue of global importance. The calcium sulfoaluminate (CSA) cement emits lower CO<sub>2</sub> than the Portland cements while manufacturing. However, ettringite, which is a main hydration product of CSA cement, starts dehydrating at a temperature above 100°C, hence it may limit the CSA cement for high temperature application. Recently, an early carbonation curing of cement-based material has been extensively studied in terms of carbon neutralization. The carbonation curing of CSA cement has a potential to transform the AFt and AFm phases into calcium carbonate, and the transformation of unstable hydrates to stable hydrates can increase the resistance to elevated temperature. This review study summarizes and discusses the carbonation curing effect of CSA cement and the thermal stability of CSA cement exposed to elevated temperatures.
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