• Composites Research
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• 제31권5호
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• pp.276-281
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• 2018

본 논문에서는 이론적인 계산 모델을 이용하여 다양한 섬유 다발 구조를 갖는 직조섬유강화 복합재의 탄성 거동을 예측하였다. 직조 복합재의 기계적 물성을 대표할 수 있는 대표체적요소 (RVE)을 설정하였으며, 직조 다발의 굴곡을 다양한 정현파 함수로 정의하였다. 고전적층이론 (CLPT)를 이용하여 영률, 전단 탄성계수, 포아송비와 같은 직조복합재의 유효물성을 예측하였다. 섬유 다발의 구조와 형태 (평직, 능직)에 따라 섬유 부피 분율을 계산하였으며 각각의 탄성 거동을 이론적인 계산 모델을 통해 예측하였다. 또한, 이론적 예측 결과의 검증을 위해 진공수지주입(VARTM) 공정을 사용하여 평직 및 능직 형태의 복합재 시편을 제작 후 물성 시험을 진행하여 실험 결과를 이론적 예측 결과와 비교하였다. 결과적으로 직조 복합재의 탄성 거동에 대한 이론적 결과와 실험 결과 간에 매우 높은 정확도를 갖는 것을 확인할 수 있었다.

• 박물관보존과학
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• 제9권
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• pp.67-83
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• 2008

국립중앙박물관이 소장하고 있는 청연군주 출토복식(신수751 의류 일괄) 중 織金 및 金箔이 있는 복식의 보존 처리 과정을 소개하고자 한다. 금사 및 금박의 비파괴분석(X-선형광분석:XRF)을 실시한 다음 표면의 금(Au)이 열화가 진행되면서 분상화된 금층에 아교 2%용액을 도포하여 접착력을 강화하였다. 표면의 먼지와 오염물제거를 위해 진공흡입을 통한 건식세척과 분사식 습식세척을 병행하였고 손상부분을 보수하여 유물의 원형을 회복하였다.

• 한국의류학회지
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• 제27권1호
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• pp.134-142
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• 2003

Performances of Taekwondo fabrics were evaluated in respect of fiber component. yarn count, weave structure and wearing comfort. As a beginning step, we investigated the present situation of Taekwondo wears by questionnaire from pro and amateur Taekwondo players. Samples employed in this study were cotton/nylon blend fabric that was newly woven for this study as well as fabrics of current Taekwondo wears for sale in the market. Their fundamental properties measured were such as air permeability, water vapor transport. wickability, absorption rate, Qmax values, thermal conductivity, durability, hand value, and etc. In addition, subjective wearing sensations were evaluated using Taekwondo wears made of those fabrics. From the results of the objective measurement and the subjective wearing test, we estimated the total fitness of fabrics as a Taekwondo wear. From the questionnaire we could see that pro players and amateurs wanted highly absorbing, quick drying, and soft-tough and complained abrasive surfaces and static elasticity of current fabrics. In view of the results so far achieved, nylon blended fabrics newly woven in this study, showed better comfort-related properties from both of the objective and subjective tests. It was also represented that finer yams enhanced water absorption and touch, and fabrics with rough surface such as honeycomb weave was superior in wearing comfort as well as aesthetic appearance.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 1999년도 추계학술발표대회 논문집
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• pp.211-214
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• 1999

The stress distribution around the cutout of composite cylindrical shells with a circular or elliptical reinforced cutout subjected to axial compression or tension is studied by asymptotic method. Analytical solutions used a Donnell type orthotropic shell theory are presented by the defined stress concentration factor and are compared to experimental results. The experiment used the universal testing machine (UTM), strain gage and fixtures designed/manufactured for axial tension test of a cylindrical shell is carried and the composite material used in the experiment is plain weave glass fiber reinforced plastic (GFRP).

• Composites Research
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• 제18권2호
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• pp.13-19
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• 2005

본 논문에서는 전단 변형을 받은 새틴 건직물을 이용하여 토우간격, 토우 두께. 토우 진폭변화 등의 토우 파라메터의 미소 변형을 관찰하였다. 재료 내부에 발생한 평면 하중에 따른 관찰 결과를 평가하기 위해 일방향 편향 인장실험과 이축 인장실험 결과와 비교하였다. 불균일한 하중분포를 유발하는 정렬 불일치각을 가지는 재료의 사진틀 전단실험 곁과 인장방향과 압축방향의 토우에서와 다른 변형 거동을 보이는 것을 확인하였다.

• 한국의류학회지
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• 제23권8호
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• pp.1161-1169
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• 1999

This research was aimed to identify the artifact type and their characteristics of the textile related materials excavated from Koryo Dynasty tombs of Hyungok-ni Danyang. Microscopy solubility test energy dispersive X-ray spectroscopy(EDS) and fourier transform infrared spectroscopy (FT-IR) fabric density test were used for the identification and when necessary standard samples were made in order to compare its characteristics with hose of the original artifact, the result indicated that the artifacts included both textile and paper. Artifacts from Burial 14 were comprised of textile fragments FT-IR and the solubility test conducted on the artifact indicated that the textiles were made with ramie woven with plain weave technique in a fairly loose fabric density. Rest of the artifacts were all comprised of paper.

• Fibers and Polymers
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• 제6권2호
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• pp.162-168
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• 2005

A methodology for the objective evaluation of water repellency is studied using image analysis of the sprayed pattern on woven fabrics according to a standard spray test (AATCC Test Method 22-2001). The wet area ratio obtained from the spray standard test ranking is found to be exponentially related with its water repellency rating. Mean filtering is used to remove the effect of weave texture and the transmitted light through interyarn spaces. The ring frame of the instrument and wet region are recognized using Otsu thresholding technique. And Hough transform and outline operation are used to obtain the size and position of the ring frame. The objective assessment of the water repellency using image processing can reduce unnecessary confusion in the subjective determination of the water repellency.

• 한국의류학회지
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• 제27권5호
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• pp.533-544
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• 2003

The purpose of this study was to provide practical information to design woolen fabrics in terms of structural and surface characteristics, which produce texture images of fabrics. The relationship among structural, surface characteristics and texture images, and preference and purchase intention were analyzed. To evaluate the texture images of the fabrics subjectively, 7 rank＇s semantic differential scale questionnaires were developed with thirty adjective pairs. Blind and non-blind test were performed with 320 female subjects who were in their 20-30＇s. Commercially available 48 woolen fabrics were used as specimens. Results showed that five factors were obtained: classic, elegance, warmth, natural and casual. These factors were closely related to fiber type, weave type, fabric counts, and finishes.

• 한국지역사회생활과학회지
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• 제27권2호
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• pp.295-304
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• 2016

This study was conducted to evaluate and compare the waterproofness and water vapor transport properties of 30 waterproof and breathable textiles in the market. MVTR upright cup test with water, MVTR inverted cup test with potassium acetate, and sweating hot plate test method were used for measuring the breathability of fabric samples. The waterproofness of all fabric samples and evaporative resistance of garment ensembles made with 5 selected waterproof and breathable textiles out of 30 samples were tested. The results of this study were as follows. The base fabrics of the most samples were basic weave structure with either polyester or nylon fiber. The waterproofness was over $5000mmH_2O$ for all the samples except densely woven fabrics. The evaporative resistance of garments that were made out of 5 fabric samples with a range of low to high breathability ranged $39.9{\sim}56.7m^2{\cdot}P{\cdot}W^{-1}$. The data of the water vapor transport properties of fabric samples varied with different test methods. Overall the bicomponent film fabrics showed better breathability and less standard deviation regardless of test methods. It is expected the breathability data without the information of test conditions used for marketing would confuse the consumers and the apparel manufacturers.

• Composites Research
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• 제35권4호
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• pp.269-276
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• 2022

본 연구에서는 층간분리의 위험이 없는 3차원 직조방식으로 복합재 보강패널을 제작하고 좌굴하중과 고유진동수 등의 기계적 특성을 연구하였다. 보강패널의 스트링거와 외피는 일체형으로 제작하였고 T800급 탄소섬유로 만들어진 프리폼에 수지(EP2400)를 충진시키는 방식을 적용하였다. 제작된 보강판에 대하여 압축시험과 고유진동수 측정 시험을 수행하였고 유한요소해석 결과와 비교하였다. 또한 3차원 직조 구조물의 성능을 상대적으로 비교하기 위해 일방향 프리프레그와 2차원 평직(fabric)으로 동일한 치수의 보강패널을 제작하여 시험과 해석을 수행하였다. 시험값을 기준으로 일방향 프리프레그와 2차원 평직으로 제작된 보강패널의 좌굴하중은 3차원 직조 패널의 좌굴하중 대비 각각 20%, -3%의 차이를 보였다. 본 연구로부터 3차원 직조방식으로 제작된 일체형 보강패널의 좌굴하중은 일방향 프리프레그 적층 보강판의 좌굴하중보다는 낮지만 2차원 평직 보강판넬보다는 미세하게 높은 수준의 값을 보임을 확인하였다.