• 공업화학
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• 제27권2호
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• pp.179-184
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• 2016

본 연구에서는 미분쇄 탄소섬유/카본블랙/천연고무 복합재료의 미분쇄 탄소섬유 방향이 기계적 특성에 미치는 영향을 알아보았다. 복합재료는 6 phr 미분쇄 탄소섬유와 40 phr 카본블랙을 천연고무에 첨가하였고 2축-롤-밀 장비를 이용하여 복합재료 내의 미분쇄 탄소섬유를 수직, 수평으로 정렬방향을 제어하였다. 기계적 특성은 인장특성, 인열강도를 통해 고찰하였다. 실험 결과, 인장강도, 100%~300% 모듈러스, 인열강도는 미분쇄 탄소섬유가 수직으로 배향되었을 때 그렇지 않았을 때보다 증가하였고 미분쇄 탄소섬유를 정렬하지 않은 복합재료의 기계적 물성은 감소하였다. 결과적으로, 복합재료 내에서 미분쇄 탄소섬유가 수직으로 배향되었을 때 인장특성과 인열강도의 증가로 이어진 결과이며, 이러한 결과는 탄성력이 우수한 미분쇄 탄소섬유의 존재가 기인하였기 때문이라고 판단된다.

• 대한가정학회지
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• 제17권4호
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• pp.23-28
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• 1979

In order to measure the change of constructional and some properties of knitted under wears by laundry, constructional properties, such as fabric count , yarn count, loop length and cover, factor, and some properties , such as shrinkage, tearing, strength, air permeability, electrostatic charge of under wears sold in the market were tested. The results of the experiment can be summarized as follows.1. Interlock and rib were increased in wale direction after laundry and decreased in course direction , plain was decreased, in both direction after laundry. 2. Loop form of plain was changed more than those interlock and rib after laundry. 3. Tearing strength was decreased 51% in wale direction, and 70% in course direction after 20 times laundry. Air permeability was generally increased. 4. Electro static charge was increased 9 times after laundry.

• 한국의류학회지
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• 제22권8호
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• pp.1060-1068
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• 1998

The effects of various catalysts and softners on the anti-crease finish of ramie with glyoxal were investigated. A number of metal salts commonly used as Lewis acid catalysts in DP finishing of cotton with formaldehyde and N-methylol agents were screened for glyoxal treatment of ramie fabric. Various organic and inorganic acids were mixed with Lewis acid catalyst as co-catalysts to improve catalytic activity. As a result, the combination of aluminum sulfate and citric acid was proven highly effective in catalyzing the crosslinking of ramie cellulose by glyoxal under lower curing temperature. With a mixed catalyst, performance properties, such as whiteness and tearing strength as well as wrinkle recovery of treated ramie fabric were improved as compared with that treated with aluminum sulfate alone. Additional improvement of tearing strength and wrinkle recovery was achieved by applying silicons softner in the treatment bath.

• 한국의류산업학회지
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• 제11권3호
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• pp.465-468
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• 2009

In this study, acid cellulase was used to treat denim fabrics by varying pH, temperature, enzyme concentration, treatment time and non-ionic surfactant (Triton X-100) concentration. Treatment condition was controlled based on the weight loss. The characteristics of enzyme-treated fabrics were measured in terms of tearing strength, stiffness, and color difference. The optimum conditions for cellulase treatment of denim fabric were pH 5.0, $50^{\circ}C$, 3% (o.w.f.), 90minutes. The weight loss did not change significantly with the addition of a non-ionic surfactant, but it improved when more non-ionic surfactant were used. The tearing strength of enzyme-treated denim fabrics did not deteriorate. The stiffness of the treated fabrics improved with the enzymatic treatment with and without the non-ionic surfactant. The difference in color of fabrics treated with enzyme increased.

• 폴리머
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• 제38권5호
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• pp.664-670
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• 2014

The effects of different filling materials and stabilizers in polymer based materials that are used as shoe soles in the shoemaking industry on the mechanical properties (strength, failure, tensile, tearing, bending etc.) of the final products have been examined in this study. Natural rubber (NR RSS3) and styrene-butadiene rubber (SBR 1502) were used as the main matrix material. New compounds were formed by replacing the fillings in the general compound of the existing factory ($SiO_2$, $CaCO_3$) with 40% (1200 g) blast furnace flue dust, rice husk, reclaimed rubber (recycled) and wood ash. Comparison of the new compounds with the existing compounds revealed a decrease in hardness, density, dimension stability, bending, tearing, % elongation and failure strength and an increase in wearing.

• 한국공간구조학회논문집
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• 제8권2호
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• pp.55-62
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• 2008

막 구조는 형태의 다양성, 막의 가벼움과 내구성, 투광성 및 균질성 때문에 현대 건축물에 다용하게 사용되어 새로운 건축세계를 열어가고 있다. 본 논문은 대공간 건축 구조물에 주로 사용되는 유리섬유 막 재료의 역학적 특성에 대한 연구이다. 현재 주로 사용되는 건축용 막 재료의 종류에는 PVC, PVF, PVDF, PTFE, ETFE 막재들이 있다. 본 연구에서는 이러한 건축용 막재료에 대한 역학적 시험 방법을 정립하고, PTFE 코팅 유리섬유 막재에 대한 인장강도, 인열강도 및 반복하중 시험 등을 실시하여 건축용 막 재료의 역학적 특성을 분석하고자 한다.

• 한국의류산업학회지
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• 제7권1호
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• pp.91-95
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• 2005

The purpose of this study is to investigate the improvement of fiber surface, physical properties and research the physical properties and dyeability of cotton fabrics treated with KOH solution at low and high temperature. The treatment conditions for mercerization with KOH were changed various temperatures(25, $90^{\circ}C$), concentrations(15, 20, 25, 30%. w/v) and times(30, 60, 180, 300sec). The effects of mercerization after KOH treatment estimated with tensile strength, tearing strength, shrinkage, drape stiffness, moisture regain, fiber surface, and dyeability. The optimal conditions were concentration of KOH 20%, time 180sec in low temperature and concentration of KOH 20%, time 60sec in high temperature. The results are as follows; Tensile strength, tearing strength and moisture regain were much improved than those of untreated cotton fabric. Shrinkage and drape stiffness of KOH treated cotton were more increased at $25^{\circ}C$ than $90^{\circ}C$. Fiber surface showed more rounded shape at $25^{\circ}C$ than $90^{\circ}C$. Dyeability of cotton fabrics improved by KOH treatment.

• 한국의류학회지
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• 제33권1호
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• pp.149-159
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• 2009

The purposes of this study are to evaluate physical performance of metallic Jacquard fabrics, and to contribute to the research and development of the women's suit made of the metallic Jacquard fabrics. First, eight fabrics were woven with two kinds of warp yarns(nylon and rayon) and weft yarn blended with various contents(0, 7, 14, 21%) of metallic yarn. Second, the mechanical properties were measured by using the KES-FB system, and physical properties such as tensile strength, tearing strength, abrasion resistance, drape, pilling, snagging, degree of crease resistance, flexural stiffness, specular gloss, folding endurance and electrostatic propensity were measured. The results were as follows. As the metal fiber content increased, bending, shear, thickness and weight increased, which imply low recovery of wrinkles. It means that metallic Jacquard fabrics enable to use as a memory fabric. 7% metallic Jacquard fabric showed a low value at total hand value, but there was little change. As the metal fiber content increased, tensile strength, tearing strength, drape coefficient, specular gloss and flexural stiffness increased, however the degree of crease resistance, electrostatic propensity and folding endurance decreased. The metallic Jacquard fabrics were excellent in snagging, abrasion resistance and pilling.

• 한국조리학회지
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• 제15권1호
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• pp.296-308
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• 2009

이인자의 연구에 따르면 우리나라 조리사 수는 120만 명을 넘는다. 그럼에도 조리사 환경과 관련된 연구는 찾아보기 어렵다. 그렇지만 현재 조리사들이 작업 현장에서 신고 있는 신발을 조사하여 보기로 하였다. 대부분의 조리 작업 현장에서 일어나는 사고의 유형은 신고 있는 신발에서 기인한 것으로 보고, 본 연구는 조리 종사원들이 작업 환경에 적합한 신발에 관한 연구로서 본 신발을 개발함으로써 조리 현장에서 일어나는 미끄럼 등과 같은 잠재 위험에서 조리 종사원들을 보호하고 피로감을 줄여 업무 효과를 높이려는데 그 목적이 있다. 조리화에 대한 연구가 없기 때문에 조리 종사원들이 현재 신고 있는 안전화를 네 가지 요소에 중점을 두고 실험하였다. 이 네 가지 요소 실험을 바탕으로 무게와 미끄러움 정도, 인열 강도, 박리 강도를 실시한 결과에 따라 새롭게 만들어질 조리화에 대한 기준을 제시하였다. 그 결과로서 조리화의 무게는 체중에 1% 내외로 만들어져야 하며, 미끄러짐 저항도는 0.50 $\mu$, 인열 강도는 50.0 N/mm, 박리 강도는 3.0 kg/cm의 기준치를 제시하였다.

• 한국기계가공학회지
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• 제20권4호
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• pp.127-134
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• 2021

In this study, the adhesive fracturing characteristics of a DCB specimen due to single and heterogeneous bonding materials under tearing load was investigated. The experiments were conducted to examine the fracturing properties of the adhesive DCB specimen. As an experimental condition, a forced displacement of 3mm/min was applied to one side while the other side was fixed. As a result of the experiment, it was found that the AL6061-T6 material was superior to the CFRP material in terms of maximum stress, specific strength, and energy release rate when compared to the adhesive fracturing property of a single material. We tested CFRP-AL, a heterogeneous bonding material, and compared its experimental results to the results from the single materials. Based on these results, CFRP-AL with a heterogeneous bonding material was observed to have the superior structural safety compared to single materials for the mode III fracture type.