• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.4
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• pp.481-486
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• 2010

Recently, carbon fiber reinforced plastic (CFRP) have been used in various fields because of its high specific modulus, and chemical properties. Most products in which CFRP composites are used are manufactured by joining the product components by bolts or pins. Holes for bolts and pins decrease the strength of the components because these holes act as notches in the structures. In this study, the fracture strength of CFRP plain-weave composite plates containing holes is experimentally investigated to examine the effects of hole-size and specimen width on notched tensile strength. The results show that the characteristic length considered in the point stress criterion depends on the hole size and specimen width. There exists a certain relation between notched tensile strength and characteristic length. Fracture criterion is redefined on basis of this relation.

• Journal of Fashion Business
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• v.15 no.3
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• pp.112-124
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• 2011

Textile and clothing in Ancient Egypt have carried long history and tradition. Especially, Egyptian textile culture, created mostly by the Copt, has the originality of weaving technology and the artistic beauty of the weaving motifs, making the textiles comparable to modern textiles. The purpose of this study is to research on the characteristics of Coptic textile designs of ancient Egypt and the tunic, a basic garment made of Coptic textiles, and offer materials for the development of the textiles and designs with artistic values which can be shared in the modern era, not just for the research of the relics of the past. Therefore, this study will follow the historical background of Coptic textiles and the process of the development, and look into the distinct features under the categories of material, colors and motifs. In addition, the tunic and its weaving technology will be explained and this will help understand the originality of Coptic textiles. The scope of this study is limited to the period of the 3rd to 12th centuries when the Egyptian weaving technologies advanced dramatically and many of the ancient Egyptian textiles discovered from the grave goods dates back, the research methode of the tunic as well as books published at home and abroad, research paper and photograph works. The textiles had developed along the Egyptian history which was influenced by different cultures such as Greek, Roman, pagan, Christian, and later, Islamic. For the textiles, they used a variety of pictorial motifs including Greek goddesses, pastoral scenes related to the Nile River and animals, human figures, geometrical figures and Christian icons. They are symbolic, natural, and mythological characters, and this explains that the world views and religions of the weavers influenced the development of specific motifs. Coptic textiles was used to make a tunic, a simple straight-sided gown without sleeves worn by men and women and was woven in a combination of linen plain weave and woolen tapestry weave for a tunic. Not only the excellence of the weaving technologies and the beauty of the colors used in the textiles, but also the diversity of the textures through weaving, embroidery, and knotting are detected in Coptic textiles.

• Journal of the Korean Home Economics Association
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• v.43 no.5 s.207
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• pp.43-55
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• 2005

This research was designed to investigate and compare the characteristics of preferred clothing textiles for slacks and skirt of college students. One hundred five subjects majoring in fashion design were surveyed and the subjects selected three favorite materials among 120 samples presented in a swatch book. The subject's weighted frequencies were added tv order of preference. The results of this study were as follows: 1. In the spring and fall seasons, black twill cotton drill was preferred foremost as a textile for slacks, and medium gray basket weaved cotton pinhead with stripe pattern was preferred as a textile for skirts. 2. In summer, dark bluish gray plain linen crash was the most preferred material for slacks, and pale yellow plain linen tropical cloth was preferred for skirts. 3. In winter, olive gray cotton corduroy was the most favorite textile for slacks, and moderate brown twill wool hound check was preferred for the skirt. 4. In thickness and weight, textiles for winter were thicker and heavier than those chosen for other seasons, and textiles for skirts showed various thicknesses and weights as compared with those of slacks. 5. In fiber content, natural fibers such as cotton and wool were preferred for an seasons. 6. In the weave of textiles, twiu we,3ve was preferred for spring, fall and winter season, and plain weave was preferred for summer. 7 The most preferred colors for slacks were B and PB, and those for the skirts were YR and PB. For color characteristics, solid fabrics were generally preferred, and patterned fabrics were preferred for skirts as compared with slacks.

• Textile Coloration and Finishing
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• v.24 no.4
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• pp.288-295
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• 2012

Although some degree of mechanical properties of suede fabrics mainly related to non-woven suede fabric has some researched, the thin suede fabric has rarely been researched. In this study, polyester(DTY 50/72) was used for warp, and after producing latent yarn and sea-island yarn for weft, two yarns were compounded to produce sea-island DTY yarn. By using the two produced yarns for warp and weft, we produced thin suede fabric with stretch function. For weft 2ply, weft density 85, 90, 100(picks/in) were applied to weave fabric, and for weft 1ply, weft density 125, 135, 140(picks/in) were applied to produce weft face 5-end satin weave. The mechanical properties of the produced fabric were researched. The result are as followed. The weight loss ratio of the suede fabric produced for this experiment reached 15% on the conditions of temperature $90^{\circ}C$ and 20 minutes, so that island parts were completely separated. The strength of weft 1ply applied suede fabric was about 7.5kg and that of 2ply suede fabric and about 3.5kg. But the strain of two samples ranged from about 40 to 43%. Although Hari was high when weft was denser. The values of Koshi and Kisimi were low. And shear stiffness was high when sea-island DTY yarn was used. The WC value was higher in the case of 2ply than in that of 1ply sea-island DTY yarn for weft, so that we may conclude that Fukurami was more affected in the 2ply case.

• Journal of Fashion Business
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• v.23 no.3
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• pp.67-84
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• 2019

Since the early 2000s, various fashion design products that use 3D printing technology have constantly been introduced to the fashion industry. However, given the nature of 3D printing technology, the flexible characteristics of material of textile fabrics is yet to be achieved. The aim of this study is to develop the optimal design conditions for production of flexible and elastic 3D printing fabric structure based on plain weave, which is the basic structure in fabric weaving using SLS 3D printing technology. As a the result this study aims to utilize appropriate design conditions as basic data for future study of flexible fashion product design such as textile material. Weaving structural design using 3D printing is based on the basic plain weave, and the warp & weft thickness of 4mm, 3mm, 2mm, 1.5mm, 1mm, and 0.7mm as expressed in Rhino 6.0 CAD software program for making a 3D model of size $1800mm{\times}180mm$ each. The completed 3D digital design work was then applied to the EOS SLS Machine through Maker ware, a program for 3D printer output, using polyamide 12 material which has a rigid durability strength, and the final results obtained through bending flexibility tests. In conclusion, when designing the fabric structure design in 3D printing using SLS method through application of polyamide 12 material, the thickness of 1 mm presented the optimal condition in order to design a durable digital textile structure with flexibility and elasticity of the 3D printing result.

• Composites Research
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• v.32 no.5
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• pp.206-210
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• 2019

As the use of composite materials of woven structure has expanded to various fields such as automobile and aviation industry, there has been a need for reliability problems and prediction of mechanical properties of woven composites. In this study, finite element analysis for predicting the mechanical properties of composite materials with different weaving structures was conducted to verify similarity with experimental static properties and an effective modeling method was developed. To reflect the characteristics of the weave structure, the meso-scale representative volume element (RVE) was used in modeling. Three-dimensional modeling was carried out by separating the yarn and the pure matrix. Hashin's failure criterion was used to determine whether the element was failed, and the simulation model used a progressive failure model which was suitable for the composite material. Finally, the accordance of the modeling and simulation technique was verified by successfully predicting the mechanical properties of the composite material according to the weave structure.

• Composites Research
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• v.19 no.1
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• pp.36-42
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• 2006

MWNT(multi-walled carbon nanotube)-filled plain-weave glass/epoxy composites were fabricated and electromagnetic characteristics of the composites were investigated. The observation of the microstructures of the composites revealed that MWNTs are mostly distributed in matrix rich region and the interface between glass fiber yarns in warp and fill direction. The permittivity of the composites, measured in X-band (8.2-12.4 GHz) frequency range, increased with weight fraction of MWNTs and remained almost constant with frequency. The measured permittivity was used to investigate the reflection loss of radar absorbing structures (RAS) composed of MWNT-filled composites according to thickness and a RAS were constructed with 10 dB absorbing bandwidth 4.2 GHz and 3.3 mm in thickness.

• Fibers and Polymers
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• v.4 no.2
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• pp.71-76
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• 2003

We evaluated the seam characteristics with finishing, seaming and sealing processes and seam Puckering behavior of the breathable waterproof fabrics with laser scan. There were differences in 99% significant level between the seamed fabric and the sealed fabric. Seam breakage was initiated with the breakage of sewing thread, so the seam strength after seaming was almost uniform. The sewn seam strength and elongation increased with sealing process in all finishing methods. Pucker grade of laminating type was generally much higher than that of the coating type. We confirmed that wave length and amplitude have more important meaning than the number of weave in the breathable waterproof fabrics. The puckering in breathable waterproof fabrics is mainly occurred by inherent and feeding pucker. The former if due to the insertion of sewing thread and the littler is caused by differential feeding when two pieces of fabric are fed into the gap between a press foot and needle plate.

• Journal of the Korean Society of Clothing and Textiles
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• v.23 no.6
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• pp.820-828
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• 1999

The purpose of this study was to investigate the changes of pore area and water vapour transport by the changes of moisture regain and fabric structure of wool fabrics, As specimens 4 worsted wool fabrics were used. The pore area were measured by image analysis method and dinamic vapour transport and water reisitance was determined by clothing-environment-body modelling system. The pore area was changed by the moisture regain of wool fabrics. The change of pore area was influenced by the yarn twist thread count and cover factor and the weave type. The water vapour transport was changed by the moisture regain. The change of water vapour transport was influenced by the change of pore aree which was determined by image analysis.

• Journal of Fashion Business
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• v.13 no.6
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• pp.89-98
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• 2009

Computer development and new printing technology allow us to express a new type of digital textile designs those were not possible in the past. In this study, watercolor overlaying effect of various colors was tried using airbrush tool in Photoshop program. Photoshop program is a powerful graphic tool and can be used in textile design area to generate various types of designs. Woven texture was also applied to the design to give yarn dyed effects or rich appearance. Photoshop program was also used to develop woven texture without the help of the professional textile CAD. Photoshop channels enables the designers to apply various textures to the image. Plain weave and houndstooth were applied in this study. Colorways of the developed designs having watercolor effect and woven texture by applying Photoshop color adjustment function. Quick and simultaneous changes of colors were possible using this method. The developed textile designs were printed by transfer DTP. Successful textile design prints were expressed and showed watercolor overlaying effect and woven texture. The printed textiles show a little brighter color, and therefore, sample printing is recommendable in case of color sensitive production.