• Title/Summary/Keyword: Seamless Analysis

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Finite Element Analysis of an Elongation Rolling Process for Manufacturing Seamless Pipes (심리스 파이프 제조를 위한 일롱게이션 공정의 유한요소해석)

  • Jung, Seung Hyun;Shin, Yoo In;Song, Chul Ki
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.10
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    • pp.923-928
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    • 2014
  • Elongation rolling process is an intermediate process to make the uniform thickness and uniform surface roughness during producing seamless pipes. The thickness and surface roughness of seamless pipes are generally affected by the distance of rolls and guide shoes, the roll shape, and its cross angle. In this study, finite element analysis for shape forming process is based on the analysis model of elongation rolling mill with guide shoes. This paper shows how the cross angle of the roll, the rolling rpm, and the distance of the guide shoe influence on the outer diameter and the thickness of seamless pipes. The rolling rpm did not give much influence on outer diameter.

Seamless Garment Knitwear Design Trend (국내외 무봉제 니트웨어 디자인 경향)

  • Lee, In-Suk;Cho, Kyu-Hwa;Kim, Ji-You
    • Journal of Fashion Business
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    • v.15 no.1
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    • pp.34-49
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    • 2011
  • This study is the design case analysis of seamless knitwear in order to suggest a new direction of high value-added seamless knitwear and seek for its possibility. Seamless knitwear is the up-to-date knit product that is made by a knitting machine without sewing, and it maintains elasticity of a material itself and is the closest type to the essence of knitwear. The seamless knitwear can satisfy satisfaction of customers with more elegance and individuality and become a method to develop a high value-added design. This study suggests a new direction for the 21st century knitwear design through a practical approach of seamless knitwear designs, pursues a high value fashion, and contributes to improving national competitiveness of fashion industries in order to be a practical research data for seamless knitwear designs.

Effect of Inner Pressure on the Plastic Deformation Behavior of Seamless Pipe Deformed by Compression Process (압축 가공된 비용접 배관의 소성변형 거동에 미치는 내압의 영향)

  • Seo, W.G.;Lee, M.S.;Son, S.J.;Choi, S.H.
    • Transactions of Materials Processing
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    • v.28 no.4
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    • pp.175-182
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    • 2019
  • In this study, compression process is performed on the seamless E235 pipe using the newly developed compression technology for seamless pipe. Experimental analysis on the heterogeneity of microstructures and mechanical properties of the deformed seamless pipe is conducted. As a result, the correlation between microstructures and mechanical properties are determined. The spatial distribution of effective stress and effective strain developed in the seamless pipe deformed through compression is analyzed using the finite element method (FEM) based on different inner pressure conditions. From the results of the FEM, the impact of the inner pressure on effective stress and effective strain of the seamless pipe deformed through compression can be understood theoretically.

Connecting part Design of Bodies and Sleeve of Seamless Sweaters - Focused on Knitting Method of Bodies and Sleeve Connecting part - (무봉제 스웨터의 몸판과 소매 연결 부위의 디자인에 관한 연구 - 몸판과 소매 연결 부위의 편성 방법을 중심으로 -)

  • Ki, Hee-Sook;Kim, Mi-Joo
    • Journal of the Korea Fashion and Costume Design Association
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    • v.12 no.4
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    • pp.137-147
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    • 2010
  • This study set out to make experimental clothes by giving variations to the connecting part of a seamless sweater, propose designs and composition approaches to improve the wearing sensation and satisfaction with appearance through wearing trials, and provide basic data that would be of practical help to follow-up study on seamless knit and the growth of seamless knit in the Korean knit industry. The connecting part is the biggest characteristic and the most important part in seamless knitwear and affect the functionality and fitness of the clothes and the appearance of the armhole. The investigator thus made five different pieces of experimental clothes according to the composition methods for connecting part and put them to the test by a group of experts for appearance assessment. The assessment results were analyzed through Analysis of variance(ANOVA), and the items with similar results were put to the Duncan test for intergroup comparison. According to the analysis results, experimental clothes C and E received the highest evaluation in almost every assessment item, whereas experimental clothes A did the lowest appearance evaluation.

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Performance Analysis of Seamless Interworking Handover for Supporting MMS Continuity over WLAN and CDMA2000 Networks (WLAN과 CDMA2000 이종 네트워크에서 MMS 서비스의 연속성을 제공하기 위한 새로운 핸드오버의 성능 분석)

  • Kim, Su-Yong;Cho, Sung-Joon
    • Journal of Advanced Navigation Technology
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    • v.10 no.2
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    • pp.128-137
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    • 2006
  • Recently, the combination of WLAN and 3G wireless technologies will make MMS service more ubiquitous, bringing benefits to both service providers and their customers. To realize seamless MMS service over WLAN and CDMA2000 networks, we design novel seamless interworking architecture by reusing the existing standards and network elements at the same time. Based on the proposed seamless interworking architecture, we also present seamless notification architecture and seamless handover architecture that can't be possible within current MMS reference architecture. This paper will make a contribution for service providers to provide their customers with seamless MMS service over WLAN and CDMA2000 networks.

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A Study on the Knit Flare Skirts for Making Method through Sensory Test - Cut & Sew and Seamless Making Method - (니트 플레어스커트의 제작 방법에 따른 외관 평가 - 봉제형과 무 봉제형 -)

  • Ki, Hee-Sook;Kim, Young-Ju;Suh, Jung-Kwon;Ryu, Kyoung-Ok;Suh, Mi-A
    • The Research Journal of the Costume Culture
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    • v.18 no.3
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    • pp.465-475
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    • 2010
  • For this study, 18 kinds of cut and sew or seamless knitted test garment were made. Samples differed from each other by skirt angles($90^{\circ}$, $180^{\circ}$), gauges(7G, 12G, 15G), and grain directions(bias direction, wale direction, and radial direction). After measuring the mechanical properties of various gauges on the seamless knitting machine, I compared shape of the knitted flare skirt through subjective evaluation on appearances. The data analysis methods used in this study were descriptive statistics, one-way ANOVA, Duncan-test, correlation analysis, and regression analysis. The subjective evaluation on appearances of knitted flare skirts showed the following: In case of $90^{\circ}$ skirt, the seamless skirt showed a much higher score in every gauge expect that of the cut and sew 12G, and silhouette of 15G wale direction. In case of the $180^{\circ}$ skirt, the seamless type showed a much higher score in every item over the cut and sew expect the silhouette part of 7G wale direction.

A Study on Change in the Length of Knit Flare Skirt through Mechanical Properties (역학적 특성에 따른 니트 플레어 스커트의 길이 변화에 관한 연구)

  • Ki, Hee-Sook;Suh, Mi-A
    • The Research Journal of the Costume Culture
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    • v.17 no.3
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    • pp.472-483
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    • 2009
  • The purpose of this study is to analyse the effects of knit samples' mechanical properties on changes of skirt length of knit flared skirt, and to compare it to the knitting method of a seamless knitted flare skirt. So, I compared the appearance and 3-dimensional shape of a seamless knitted flare skirt with those of a fully cut knit flared skirt. For this study, 18 kinds of cut and sew or seamless knitted test garment were made. The data analysis methods used in this study were descriptive statistics, one-way ANOVA, correlation analysis, and regression analysis. The results are as follows: The result of the evaluation of knit samples' mechanical properties by the KES-FB system showed that elongation decreased as gauge increased and course direction was greatest among grain directions. The length change after wearing the knitted flare skirts appeared wholly equal to the seamless knitted, compared with the cut and sew. The change was biggest at $180^{\circ}$, 7G of the cut and sew. In grain direction, bias cut showed more than 1.2cm of length change. As the weight and thickness increased, the length changes become larger. The regression analysis indicated that the greatest contributive variables on the length changes were elongation, weight, and thickness.

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A Study on the Solid Shapes of Knit Flare Skirts Using 3-Dimensional Image Analysis (3차원 형상계측에 의한 니트 플레어스커트의 입체형상에 관한 연구)

  • Ki, Hee-Sook
    • Journal of the Korea Fashion and Costume Design Association
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    • v.13 no.2
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    • pp.103-119
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    • 2011
  • This study set out to analyze the solid shapes of knit flared skirts, which are best represented in a 3-dimensional shape for all knit skirts, according to the seamed and seamless production method and to estimate the silhouettes of knit flared skirts based on the results. It also aimed to help with the introduction and spread of seamless weaving by revising and supplementing potential problems and provide findings that would be put to active use as basic data, thus contributing to the development of original knitwear and offering fundamental materials for the development of the knitting industry. A number of experimental knit flared skirts were made according to skirt angle ($90^{\circ}$ and $180^{\circ}$), gauge (7G, 12G, and 15G), and grain (bias, wale, and radial), including 12 kinds of seamed knit flared skirts and 6 kinds of seamless knit flared skirts. Using a three-dimensional shape measurement system, the investigator measured the cross-sectional shapes of their hemlines. The SPSS 12 Version program was used for statistical processing, and descriptive statistics such as mean and standard deviation were used to compare the seamed and seamless knit flared skirts in the measurements (measurement items) of their solid shapes according to the width, gauges, and grain directions. The central grain direction of seamless knit flared skirts was in a radial form and even hemlines, thus presenting a beautiful appearance and solid shape. The 3-dimensional shapes show that seamless knit flared skirts are superior to seamed ones. The research findings are expected to open a door for Korea's knitting industry to quickly respond to small quantity batch production and additional orders.

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An Analytical Study on Moment Response of Welded Steel Pipe for Loading Rate (재학속도에 따른 용접강관의 모멘트 응답특성에 관한 해석적 연구)

  • Chang, Kyong-Ho;Jang, Gab-Chul
    • Journal of Korean Association for Spatial Structures
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    • v.11 no.4
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    • pp.37-47
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    • 2011
  • This article aims to analytically research for influence of residual stresses on bending moment responses against welded steel pipes subjected to quasi -static or dynamic loadings. The residual stresses of the welded steel pipe are computed by three-dimensional welding simulation. The bending moment responses of the welded and seamless steel pipes are determined by using three-dimensional dynamic elastoplastic FE analysis as a function of loading rate. It is seen from analytical results that the welded steel pipe shows lower moment response comparing to the seamless steel pipe, and moment difference between seamless and welded steel pipes tends to decrease as loading rate increases.

A Study of Neck Design of Seamless Knitwears - Focused on the Finishing Methods of Knitting on the Round Neck Part of Pullover - (무봉제 니트웨어의 네크 디자인에 관한 연구 - 라운드 네크 풀오버의 네크단 마무리 편성 방법을 중심으로 -)

  • Kim, Mi-Joo;Ki, Hee-Sook
    • Journal of the Korea Fashion and Costume Design Association
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    • v.14 no.4
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    • pp.113-125
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    • 2012
  • This study, as one on the neck design of seamless knitwears, set out to make experimental clothes applying various knitting methods to the hem of round neck, seek the knitting methods of finishing touches on the ending part of round neck to enhance function and aesthetic appreciation through measuring tensile strength and assessing wearing sensation, and provide basic data that would be of practical help to developing the design of seamless knitwears and mass production in the national knit industry. The ending part of neck of the seamless knitwear is not only the last stage in making knitwear but also affects the function and appearance of the clothes. The investigator, thus made six different pieces of experimental clothes according to the finishing methods of knitting on the neck, then measured tensile strength and put them to the test by a group of experts for the assessment of wearing sensation. The results were analyzed based on variance analysis(ANOVA), and the items with similar results were put to the Duncan test for intergroup comparison. According to the analysis results of measuring tensile strength, Experimental Clothes B received the highest evaluation, Experimental Clothes E the lowest. Also Experimental Clothes B was ranked the highest in almost every evaluation criteria, whereas Experimental Clothes E was ranked the lowest in the assessment of wearing sensation.

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