• Composites Research
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• 제29권5호
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• pp.293-298
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• 2016

본 연구에서는 PPS(Polyphenylene sulfide) 수지와 단면이 원형(round type), 누에형(cocoon type), 플랫형(flat type)인 3종류의 유리섬유를 사용하여 컴파운딩 및 사출을 통해 차량 전조등 광원 모듈용 유리섬유 강화 열가소성 플라스틱(glass fiber reinforced thermoplastic : GFRTP)을 제조하였다. 섬유 단면형태 및 함유량에 따른 효과를 알아보기 위해 인장, 굴곡, 충격 특성을 평가하였고, 단면에 따른 유동성, 형태안정성 및 평탄성을 관찰하였다. 그 결과 플랫 단면의 유리섬유를 사용했을 때 기계적 특성이 가장 우수했고 섬유함유량이 증가할수록 강도가 향상되는 경향을 보였다. 또한, 형태안정성, 평탄성의 경우에도 플랫 단면 섬유 사용 시 더 좋은 결과를 나타내었다.

• Advances in concrete construction
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• 제9권4호
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• pp.375-386
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• 2020

In the present study, the effect of basalt, glass, and hybrid glass-basalt fibers on mechanical properties and fracture behavior of self-compacting concrete (SCC) mixes have been assessed at room and elevated temperatures. To do so, twelve mix compositions have been prepared such that the proper workability, flowability, and passing ability have been achieved. Besides, to make comparison possible, water to binder ratio and the amount of solid contents were kept constant. Four fiber dosages of 0.5, 1, 1.5, and 2% (by concrete volume) were considered for monotype fiber reinforced mixes, while the total amount of fiber were kept 1% for hybrid fiber reinforced mixes. Three different portions of glass and basalt fiber were considered for hybridization of fibers to show the best cocktail for hybrid basalt-glass fiber. Test results indicated that the fracture energy of mix is highly dependent on both fiber dosage and temperature. Moreover, the hybrid fiber reinforced mixes showed the highest fracture energies in comparison with monotype fiber reinforced specimens with 1% fiber volume fraction. In general, hybridization has played a leading role in the improvement of mechanical properties and fracture behavior of mixes, while compared to monotype fiber reinforced specimens, hybridization has led to lower amounts of compressive strength.

• 한국생산제조학회지
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• 제21권4호
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• pp.619-624
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• 2012

In this study, MMT/fiber/polymer composites were fabricated by impregnating chopped strand glass mat into a vinylester resin mixed with clay. Tensile tests has been performed by using a universal testing machine to determine the effect of MMT addition on the tensile properties of MMT/chopped strand glass fiber/vinylester composites. And some pictures which are magnified cross section of breaking parts are has been taken by using a FE-SEM to confirm the behavior at breaking. The contents ratio of MMT applied in the composites were 0.5, 1.0, 1.5, and 2.0 wt% respectively. It has been found that the tensile strength and elastic modulus of MMT/chopped strand glass fiber/vinylester composites were improved at a proper content of MMT. Tensile strength and elastic modulus were maximized at a content of 1.0 wt% due to most effective dispersion of MMT. On the contrary, the failure strain was increased as MMT content was increased.

• 콘크리트학회논문집
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• 제15권1호
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• pp.155-161
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• 2003

This paper presents experimental and analytical results of glass fiber-reinforced concrete (GFRC) and polypropylene fiber-reinforced concrete (PERC) to investigate the relationship between tensile strength and compressive strength based on the split cylinder test (ASTM C496) and compressive strength test (ASTM C39). Experimental studies were performed on cylinder specimens having 150 mm in diameter an 300 mm in height with two different fiber contents (1.0 and 1.5％ by volume fraction) at ages of 7, 28 and 90 days. A total of 90 cylinder specimens were tested including specimens made of the plain concrete. The experimental data have been used to obtain the relationship between tensile strength and compressive strength. A representative equation is proposed for the relationship between tensile strength and compressive strength of fiber-reinforced concrete (FRC) including glass and polypropylene fibers. There is a good agreement between the average experimental results and those calculated values from the proposed equation.

• 한국결정성장학회지
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• 제23권1호
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• pp.44-50
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• 2013

E-glass 섬유는 항공기, 자동차, 레져기구의 복합재료 보강용으로 가장 널리 사용되는 유리섬유이다. 그러나 최근 E-glass 섬유의 원재료비 상승, 환경문제 및 화학적 저항성과 기계적 특성을 향상시키기 위해 산화붕소 함량을 8 %에서 0(제로)까지 감소시키는(소위 'Boron free E-glass'라고 불리는) 연구가 진행되고 있다. 본 연구에서는 'BF(Boron free E-glass)' 조성의 벌크유리와 섬유유리를 제조하고, 열적특성 및 광학적특성을 평가하였다. 5~10 %의 서로 다른 알루미나 함량을 갖는 배치를 $1550^{\circ}C$에서 2시간 용융하여 'BF(Boron free E-glass)'가 얻어졌고, 81~86 %의 높은 가시광투과율, $4.2{\sim}4.9{\times}10^{-6}/^{\circ}C$의 낮은 열팽창계수, $907{\sim}928^{\circ}C$의 연화점을 갖는 투명하고 맑은 유리가 얻어졌다. 'BF' 섬유 시편에 대한 화학적내구성 시험에 있어서는 알루미나 함량이 높아질수록 더 좋은 침식저항성을 나타냄을 확인할 수 있었다.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1999년도 제30회 추계학술대회
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• pp.208-212
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• 1999

In the use of glass fiber reinforced plastics(GFRP), cutting is often necessary. But the most of past studies have been interested in the effect of fiber orientation on tool wear. In this study, the effects of fiber contents on tool wear were investigated experimentally. By proper selection of cutting tool, the variables are cutting speed and fiber contents of 10, 20, 30wt% with fixed feed rate and depth of cut.

• 한국해양공학회지
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• 제9권1호
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• pp.57-62
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• 1995

The hygrothermal effect on three different types of Glass/Polypropylene was investigated under the environment of 4$0^{\circ}C$ distilled water. The residual strength of Glass/Polypropylene with randomly oriented and fiber content of 4-wt%(R40) was found stable under the moisture content of 0.2%. In this case, the maximum moisture content was 0.53%. On the other hand, Glass/Polypropylene with unidirection and 42wt%(U42) and 50st%(U50) fiber content, respectively, showed the residual strength less stable than R40. However, the maximam moisture contents were 0.52% and 0.45% respectively.

• 폴리머
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• 제25권4호
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• pp.512-520
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• 2001

섬유강화 복합재료의 물성을 결정하는 주요 인자중 하나는 계면결합력이다. 본 연구에서는 유리섬유와 PC/SAN 블렌드를 대상으로 하여 계면결합력을 측정하였으며 SAN함량을 0-30 wt%까지 변화시켜 실험하였다. 계면결합력 측정에는 Single Fiber Fragmentation Test법을 사용하였는데 SAN 함량이 증가할수록 계면결합력이 증가하였다. 한편 계면결합력을 증가시키기 위해 PC/SAN 혼련물을 개질하고자 소량의 SMA를 혼합하였으며, 유리섬유 표면을 실란 커플링제로 처리하여 관능기를 도입하였다. 계면결합력은 SAN/SMA계의 상용성에 크게 영향을 받았으며, 비상용성 SAN/SMA계보다 상용성 SAN/SMA계에서 계면결합력이 증가하였다. 또한 상용성 SAN/SMA계에서는 계면결합력이 SMA 내의 MA 함량이 아닌 전체 계내의 MA 함량에 의존하였으며 그 최적 함량은 0.4wt%였다.

• 한국염색가공학회지
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• 제29권4호
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• pp.239-246
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• 2017

Recently fiber-reinforced thermoplastic composites have attracted great interest from industry and study because they offer unique properties such as high strength, modulus, impact resistance, corrosion resistance, and damping reduction which are difficult to obtain in single-component materials. The demand for plastics is steadily increasing not only in household goods, packaging materials, but also in high-performance engineering plastic and recycling. As a result, the technology of recycling plastic is also attracting attention. In particular, many paper have studied recycling systems based on recycled thermoplastics. In this paper, properties of Glass Fiber Reinforced Thermoplastic(GFRTP) materials were evaluated using recycled PET for injection molding bicycle frame. The effect on thermal and mechanical properties of recycled PET reinforced glass chop fiber according to fiber cross section and fiber content ratio were studied. And it was compared void volume and torque energy by glass fiber cross section, which is round section and flat section. Mechanical characteristics of resulting in GF/rPET has been increased by increasing fiber contents, than above a certain level did not longer increased. And mechanical properties of flat glass fiber reinforced rPET with low void volume were most excellent.

• Geomechanics and Engineering
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• 제12권1호
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• pp.71-83
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• 2017

Collapsible soil presents a porous unsaturated structure, its sudden settlement after humidification, without supplementary charge, can be of a big nuisance for the foundations and therefore for the constructions built on it. To improve its structure and limit its instability, samples of laboratory reconstituted soil, with different percentages of water contents and compacted at different compaction energies, were treated with glass-fiber. The study of the mechanical behavior was performed by oedometer tests. The microstructure was explored by the Scanning Electron Microscope (SEM). The results obtained show clearly the efficiency of the treatment with glass fiber on reducing the collapsibility of such soil.