• Title, Summary, Keyword: Formability

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Mechanical Properties and Garment Formability on Breathable Fabrics for Sports-wear Garment (스포츠 의류용 투습직물의 역학특성과 의류형성성능 특성)

  • Kim, Hyun Ah
    • Fashion & Textile Research Journal
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    • v.19 no.5
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    • pp.626-634
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    • 2017
  • This study investigated garment formability of the 73 breathable fabrics for sports-wear garment and their fabric mechanical properties were measured using KES-FB and FAST systems. Predicted garment formability from the mechanical properties measured using KES-FB and FAST systems was compared and discussed with fabric structural parameters. In addition, virtual 3D simulation silhouette by I-designer CAD system wear appearance by simulation using 3D CAD system. And compared with FAST finger chart by mechanical properties of FAST system. The correlation coefficients of extensibility and shear modulus between KES-FB and FAST systems were high, however, bending rigidity and compressibility showed relatively low correlation coefficients. The correlation coefficient of garment formability of breathable fabrics between KES-FB and FAST systems was 0.82. It revealed that garment formability can be predicted from fabric mechanical properties by KES-FB and FAST systems. The garment formability of nylon breathable fabric was higher than that of PET one, and the garment formability of laminated breathable fabric showed the highest value compared to coated, dot and hot melt laminated breathable fabrics. It revealed that garment formability of breathable fabrics for sports-wear can be predicted from fabric mechanical properties and garment formability was dependent on the materials, finishing method and fabric structural parameters.

Development of Formability Test for Tube, Hydroforming (하이드로포밍용 소재의 성형성 평가 연구)

  • 한수식;박기철
    • Transactions of Materials Processing
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    • v.9 no.6
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    • pp.631-637
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    • 2000
  • The tube hydroforming technology is new key production technologies, which contribute to a light-weight cu. Because the tubes are used for hydroforming instead of the sheet materials formability test for tube is required to measure the formability of materials for hydroforming. In this Paper, a kind of formability test for tube, which can well represent the characteristics of tube hydroforming processes, is developed. Developed formability test method can consider not oかy the influence of material Properties but also contact with die and material. Some investigation was carried out to verify the effectiveness of developed formability test.

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Study on Flash Weldability and Formability in Steel Sheets by Tailor Welded Blank (소재접합 일체성형 판재의 플래시 용접성과 성형성에 관한 연구)

  • Choe, Mun-Il;Min, Gyeong-Bok;Gang, Seong-Su
    • Transactions of Materials Processing
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    • v.7 no.4
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    • pp.400-406
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    • 1998
  • The press formability analysis of welding parts was studied in the current work by the tailor welded blank. The press formability was tested by means of the flash weldability and the formability for two kinds of materials (SPCC & S35C). The results indicate that SPCC & S35C steel sheets showed good weldability and formability after an optimum welding conditions. The independent operation variables were characterized by strength of welding parts, deformation after the welding, press formability of welding parts and productibility of welding. The weldability and the quality of welding parts of the flashed SPCC steel sheet was superior to those of the S35C steel sheet, since a higher carbon content in steel sheet led to a higher hardness. The experimental results were discussed by the evaluation of the results obtained from tensile test, hardness test, micro-structure and V bending test.

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Warm Formability Variation of AZ31 Sheet by Double Stage Forming Velocity (이단성형속도에 따른 AZ31판재 온간 성형성 변화)

  • Kim, H.K.;Kim, J.D.;Heo, Y.M.
    • Transactions of Materials Processing
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    • v.18 no.2
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    • pp.112-115
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    • 2009
  • Press forming of magnesium alloy sheet is conducted at elevated temperatures to improve the press formability due to its low formability at room temperature. At elevated temperatures, magnesium alloy sheet formability is known to be very sensitive to the strain rate. In this paper, warm deep drawing tests of magnesium alloy AZ31 sheet was conducted under double forming velocity as well as single forming velocity to examine the formability change by forming velocity profile. The observed formability improvement by double forming velocity was analyzed by using the finite element analysis.

Effect of Blend Ratio and Fabric Structural Factor Affecting Garment Formability of Wool/Polyester Blend Fabric (울/폴리에스터 혼방직물의 혼용율과 직물 구조인자가 의류의 입체성형성에 미치는 영향)

  • Kim, Hyun Ah
    • Fashion & Textile Research Journal
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    • v.22 no.4
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    • pp.515-522
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    • 2020
  • This study examined the effect of the blend ratio of wool and polyester fibers, yarn and fabric structural parameters to the appearance property and the formability of worsted fabrics. The mechanical properties of twenty types of manufactured worsted and PET/wool blend fabrics were measured using KES-FB and FAST systems. Garment formability increases with the thickness and cover factor as well as increases with wool content. The correlation between KES-FB and FAST system showed a relatively high correlation with an extensibility of 0.98, bending and shear rigidity 0.71; both were higher than polyester synthetic fiber. The correlation coefficient of garment formability between KES-FB and FAST systems was 0.93 and the correlation coefficient between formability and fabric extensibility was 0.8. These results were higher than those of bending and shear rigidity. This revealed that garment formability was influenced by wool content, cover factor and fabric thickness; however, wool content and fabric thickness were the most important factors for the seam pucker. The garment formability of the worsted fabrics can be predicted by fabric mechanical properties measured from KES-FB and FAST systems.

Effect of Shot Blasting Treatment on the Formability of Thin High Strength Steels (고강도 강판의 성형성에 미치는 Shot Blasting 가공 조건의 영향)

  • Park, K.C.;Kim, J.I.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.341-344
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    • 2008
  • In order to study the effect of shot blasting condition on the formability of thin high strength steels, specimens were made by changing line speed of a commercial shot blasting plant with maintaining constant impeller condition. Surface roughness of prepared specimens was multiplied by lowering line speed or increasing density of shot impact. Formability was reduced as increasing shot impact. The elongation and stretching formability of shot blasted sheet were decreased by about 10% compared to original sheet. More significant decrease in bending formability was observed after shot blasting. This might be due to the concentrated impact near the surface where major strain occurs during bending process.

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A Study of the FEM Method on the Clad Sheet Metal Formability (Clad Sheet(Mg-Al-SUS) 성형성에 관한 해석 기법의 연구)

  • Jung, T.W.;Lee, Y.S.;Kim, D.;Hoon, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.399-402
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    • 2009
  • The Clad sheet is made roll-bonding process of the one or more material with the different property. Good formability is an essential property in order to deform a clad metal sheet to a part or component. In this study, the mechanical properties and formability of a Mg-Al-SUS clad sheet are investigated. The clad sheet was deformed at elevated temperatures because of its poor formability at room temperature. Tensile tests of the each material and clad sheet were performed at various temperatures and at various strain rates. The limited draw ration (LDR) was obtained using a deep drawing test to measure the formability of the clad sheet. A finite element (FE) analysis was performed to predict formability of the cup drawing product, one_layer model and three_layer model.

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A Study on Formability of Aluminum Sheet in Incremental Forming (점진성형에서 알루미늄 판재의 성형성에 대한 연구)

  • Park, Jong-Jin;Kim, Yung-Ho
    • Proceedings of the KSME Conference
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    • pp.1142-1147
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    • 2003
  • The formability of sheet metal appears better in incremental forming than in conventional forming. in this study, the effect of process parameters - tool type, tool size, feed rate, friction at the interface between tool and sheet, plane-anisotropy of sheet - on the formability was investigated by experiments and FEM analyses. it was found that the formability is improved when a ball tool of a particular size is used with a small feed rate and a little friction. Due to the plane anisotropy, the formability differs according to the direction of the tool movement. in this paper, details of the experimental procedures and the results obtained from the study are discussed.

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Experimental Formability Investigation for FSW Sheets with Respect to Base Material's Directional Combination (모재의 방향성에 따른 마찰교반용접 판재의 성형성에 관한 실험적 연구)

  • Kim, Dae-Yong;Lee, Won-Oh;Kim, June-Hyung;Kim, Chong-Min;Chung, Kwan-Soo
    • Transactions of Materials Processing
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    • v.18 no.1
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    • pp.73-79
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    • 2009
  • In order to investigate the formability of friction stir welded(FSW) tailor welded blanks(TWB) with respect to the base material's directional combination, aluminum alloy AA6111-T4 sheets were welded with three different conjoining types: RD-RD, TD-RD and TD-TD. Here, RD and TD represent rolling and transverse directions, respectively. For experimental formability study, three tests with gradual complexity were performed: the simple tension test with various weld line directions for uni-axial elongation, the hemisphere dome stretching test for biaxial stretching and the cylindrical cup deep drawing test. As a result, all three forming tests showed that RD-RD type samples exhibited the best formability, while TD-TD type sheets showed the least formability performance.

Effects of Bainitic Transformation Temperature and Stress State on the Formability of C-Mn-Si TRIP Steels (C-Mn-Si계 변태유기소성강의 성형성에 미치는 베이나이트 변태온도 및 응력상태의 영향)

  • Jun H. S.;Oh J. H.;Park C. G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.156-160
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    • 2001
  • The effects of TRansformation Induced Plasticity(TRIP) phenomena on the plastic deformation of 0.2C-1.5Si-1.5Mn multiphase steels have been investigated at various heat treatment and stress conditions. In order to estimate the formability, the hole expansion(HE) tests and the tensile tests were carried out. The formability evaluated from the uni-axial tensile tests was quite different from the formability measured from multi-axial HE-tests. Consequently, the formability in the multi-axial stress state decreased due to the extinction of the retained austenite relatively at earlier deformation stage and the production of irregular α' martensite. However, the defects of TRIP-steels were initiated exactly at the boundary between transformed martensite and ferrite matrix regardless of stress state. In addition, new experimental formula is proposed in order to predict the multi-axial formability of the TRIP steels from the results of uniaxial tensile test.

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