• 한국강구조학회 논문집
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• 제27권4호
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• pp.359-370
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• 2015

본 연구에서는 AFRP 스트립과 강재사이의 부착거동에 관한 실험적 연구를 수행하였다. 실험적 연구를 통해 AFRP 판과 강판사이의 계면부착거동을 관찰하고, 계면부착응력을 산정하는 것이 본 연구의 목표이다. 실험변수로는 부착길이와 AFRP의 두께를 선택하였으며, 18개의 일면전단시편 제작하여 실험을 수행하였다. 실험결과 부착길이와 AFRP 두께가 증가함에 따라 하중값을 증가하였으며, 부착길이와 AFRP 두께가 증가함에 따라 각각 63%, 86%의 하중값이 증가하였다. 끝으로 강재와 AFRP 사이의 부착응력-슬립관계를 산정하였다. 부착응력-슬립관계는 탄성선형거동을 보이고 있으며, 부착길이와 AFRP 두께는 부착응력과 파괴에너지에 영향을 덜 미치는 것으로 나타났다.

• 한국응용곤충학회지
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• 제48권1호
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• pp.109-115
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• 2009

무당거미와 나무껍질게거미줄의 열 안정성 및 기계적 성질 등을 측정하고, 그 성질들을 합성 섬유인 아라미드(aramide)와 폴리에스테르(polyester) 등의 측정 결과와 서로 비교하였다. 열 안정성에서 거미줄은 비록 상업용 섬유로 사용되는 아라미드나 폴리에스테르에 비해서는 낮았지만 기계적인 성질에서는 폴리에스테르보다 월등 우수한 결과 값을 보여주었다. 거미줄에 포함되어 있는 수분이 열 안정성과 기계적 성질에 미치는 영향을 조사하기 위해 두 종류의 거미줄을 $100^{\circ}C$의 진공에서 각각 다른 시간 별로 열처리를 하였는데, 1.5시간 동안 열처리를 시킨 후의 열 안정성과 기계적 성질이 최고 값을 나타내었다.

• 한국의류산업학회지
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• 제15권3호
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• pp.452-460
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• 2013

This study conducted a performance evaluation of protective clothing materials used for welding in a hazardous shipbuilding industry work environment. The welding process was selected as the one that most requires industrial protective clothing according to work environment characteristics. Flame proofing and convection heat protection performance (HTI) in the heat transfer characteristics of protective clothing material were indicated in the order of SW1(Oxidant carbon)>SW2(silica coated Oxidant carbon)>SW4(Oxidant carbon/p-aramid)>SW3(flame proofing cotton). However, radiant heat protection performance (RHTI) and the heat transfer factor (TF) were indicated in the order of SW1>SW4>SW2>SW3 and showed different patterns from the convection heat protection performance. SW1 showed superior air permeability and water vapor permeability. The tensile strength and tear strength of welding protective clothing material were indicated in the order of SW4>SW2>SW3>SW1 and showed that a blend fabric of p-aramid was the most superior for the mechanical properties of SW4. SW1 had excellent heat transfer properties in yet met the minimum performance requirements of tensile strength proved to be inappropriate as being a material for welding protective clothing. The abrasion resistance of woven fabric proved superior compared to nonwoven fabric; however, seam strength and dimensional change both met the minimum performance requirements and indicated that all samples appeared non-hazardous. Finally, oxidant carbon/p-aramid blend fabric appeared appropriate as a protective clothing materials for welding.

• 한국지반신소재학회논문집
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• 제18권3호
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• pp.101-112
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• 2019

그라우팅 공법은 연약지반의 보강과 방수, 부등침하로 손상된 구조물의 지지력을 향상시킨다. 본 연구는 보강섬유와 고로슬래그 미분말을 이용하여 그라우트재의 압축강도와 차수를 향상시키는데 있다. 이와 관련하여 본 연구에서는 고로슬래그 미분말의 비율이 높은(50% 이상) 시료에 대해 일축압축시험을 수행하였다. Mpa또한 탄소섬유와 아라미드 섬유를 비교하기 위하여 0, 0.5, 1.0%로 증가시켜 실험하였다. 탄소섬유 및 아라미드 섬유 함유량이 증가함에 따라 일축압축강도가 증가하였고 이는 그라우트재 내에 섬유에 의한 가교작용이 일축압축강도를 증가시키는 경향을 확인하였다. 또한 아라미드 섬유로 보강된 그라우트재에서 탄소섬유로 보강된 그라우트재 보다 일축압축강도가 약 10%이상 증가된 것을 확인하였다.

• Carbon letters
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• 제26권
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• pp.107-111
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• 2018

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.319-320
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• 2007

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• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.407-408
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• 2007

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• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2000년도 제31회 춘계학술대회
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• pp.173-179
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• 2000

The friction and wear characteristics of brake friction materials reinforced with aramid fiber, carbon fiber, glass fiber, and potassium titanate whiskers were investigated using a pad-on-disk type friction tester. In particular, the morphology of rubbing surfaces was carefully investigated to correlate the friction performance and properties of transfer films. The aramid fiber reinforced specimen showed severe oscillation of friction coefficient at low speed and low applied pressure. The carbon fiber reinforced specimen showing better friction stability exhibited uniform and stable transfer film than any other specimens. The glass fiber reinforced specimen showed unstable friction changes at high speed and high-applied pressure and the non-uniform transfer film was observed in both friction material and rotor surface. The potassium titanate whiskers reinforced specimen showed stable coherent transfer film. The wear test exhibited the potassium titanate whiskers reinforced specimen was lowest in wear amount and glass fiber reinforced specimen showed the severe wear.

• 대한기계학회논문집A
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• 제26권11호
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• pp.2374-2382
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• 2002

Aluminum alloy/aramid fiber reinforced plastic(Al/AFRP) laminates consists of high strength metal(A15052) and laminated aramid fiber with structural adhesive bond. The mixture ratio effect of epoxy resin curing agent accelerator on the tensile strength and T-peel strength characteristic in Al AFRP laminates were investigated in this study. The epoxy. diglycidylether of bisphenol A(DCEBA), It'as cured by methylene dianiline(MDA) with or without an accelerator(K-54). Eight different kinds of resin mixture ratios were selected for the test , five kinds of Al/AFRP laminates were named as Al/AFRP(1) and three others of Al/AFRP laminates were named as Al/AFRP(2). The comparison of tensile strength and T-peel strength with variation of resin mixture ratio were studied. Respectively. Al/AFRP(1) and Al/AFRP(2) indicated approximately 6.0 times and 7.0 times more improved maximum tensile strength in comparison with those of monolithic A15052. Al/AFRP(2) indicated approximately 1.5 times more impoved maximum T-peel strengths in comparison with those of Al/AFRP(1). As results. Al/AFRP(2) turned out to have more effective characteristics on the tensile strength and T-peel strength than those of Al/AFRP(1).

• 한국의류학회지
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• 제37권2호
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• pp.235-245
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• 2013

Physiological responses and subjective sensations were evaluated for wearing protective welding clothing in consideration of the work environment for the shipbuilding industry. Experimental clothing was made of oxidant carbon nonwoven fabric (SW2) and oxidant carbon/p-aramid blended fabric (SW4). The values of all items in physiological responses were higher upon wearing oxidant carbon experimental clothing versus wearing oxidant carbon/p-aramid experimental clothing (p<.001). The results of the wearing evaluation in the welding work on-site showed that existing leather protective clothing had a very low satisfaction of permeability, weight sensation and wearing sensation. For the wearing sensation of experimental clothing with SW2, permeability and durability were poor and the pressure and weight sensation satisfaction was very high. In case of SW4, the satisfaction was very high in functional movement, pressure, weight sensation and management aspects; subsequently, the overall wearing satisfaction was very good.