• Title, Summary, Keyword: Core Rigidity

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Physical Properties of Polyester, Tencel and Cotton MVS Blended Yarns with Yarn counts and Blend Ratio (PET, Tencel, Cotton MVS 혼방사의 섬도와 혼용률에 따른 물성 특성)

  • Sa, A-Na;Lee, Jung Soon
    • Fashion & Textile Research Journal
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    • v.17 no.2
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    • pp.287-294
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    • 2015
  • This study investigates the physical properties of Murata Vortex Spinning (MVS) blended yarn with yarn count(20's, 30's, 40's) and blend ratio(Polyester 100, Polyester70:Cotton30, Polyester50:Cotton50, Polyester30:Cotton70, and Polyester50:Tencel40:Cotton10). This study evaluated tenacity, elongation, bending rigidity, bending hysteresis, hairiness coefficient, irregularity and twist number. The structure of MVS blended yarn influenced stress, strain, bending rigidity, bending hysteresis and the hairiness coefficient of MVS blended yarn decreased as the yarn count increased. MVS blended yarn consists of core and sheath. The core of MVS blended yarn is composed of a parallel fiber with a wrapping fiber that covers thecore fiber. This special structure of the MVS blended yarn effects the physical properties of the yarn; in addition, the mechanical properties of the component fibers influenced the stress, strain, bending rigidity, bending hysteresis and hairiness coefficient of MVS blended yarn with the blend ratio. Polyester decreases and cotton increases resulted in decreased physical properties. A similar polyester content increased the tencel and physical properties. Appropriate physical properties and a variety of touch expression can be realized through a correct blend ratio.

The effect of architectural form on the earthquake behavior of symmetric RC frame systems

  • Inan, Tugba;Korkmaz, Koray;Cagatay, Ismail H.
    • Computers and Concrete
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    • v.13 no.2
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    • pp.271-290
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    • 2014
  • In this study, structural irregularities in plan, which has a considerable effect on earthquake behavior of buildings, have been investigated in detail based on Turkish Earthquake Code 2007. The study consists of six main parametric models and a total of 144 sub-models that are grouped based on RC structural systems such as frame, frame + rigid core, frame with shear wall, and frame with shear wall + rigid core. All models are designed to have both symmetrical plan geometry and regular rigidity distribution. Changes in the earthquake behavior of buildings were evaluated according to the number of storeys, number of axes and the configuration of structural elements. Many findings are obtained and assessed as a result of the analysis for each structural irregularity. The study shows that structural irregularities can be observed in completely symmetric buildings in terms of plan geometry and rigidity distribution.

Prediction of Core Shift using Injection Molding CAE program (사출성형 CAE 프로그램을 이용한 코어 휨의 예측)

  • Moon, Jeong-Yeon;Kwak, Min-Hyuk;Park, Tae-Won;Jeong, Yeong-Deug
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.8 no.2
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    • pp.7-11
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    • 2014
  • The Core-Shift is often generated on injection mold which have thin and long core. And Core-Shift brings out problems for thickness variation and product ejecting process. In this study, analysis of Core-Shift was performed according to change of materials of core(steel P-20, Be-Cu) and various polymers(PP, PC) by using MoldFolw MPI 6.1 which is commercial injection molding analysis program. As the results of analysis, the magnitude of Core-Shift was increased as being use polymer had lower fluidity and lower rigidity core. In the future, we will study the relationship between amount of Core-Shift and ejecting force.

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Mechanical Properties of Woven Fabrics Made from Thick & Thin Yarn (태세사(Thick & Thin Yarn)로 제작된 직물의 역학적 특성)

  • Shin Hyun-Sae;Kim Young-Sang;Son Jun-Sik
    • Textile Coloration and Finishing
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    • v.18 no.2
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    • pp.39-45
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    • 2006
  • The aim of this work is to develop sense-differentiated textiles using Thick-Thin polyester yarn(T-T yarn) with finer than 1 denier mono filament. The ITY(Interlace Textured Yarn) using T-T yarn with various over feed ratios of PET filament was manufactured with different shrinking percentage of core yarn and then the fabrics were woven on the same weaving 100m using ITY produced. The mechanical properties and the handles of the fabrics were examined with KES-FB system suggested by Kawabata. The shrinkage of ITY was increased with decreasing over feed ratio and increased with increasing heat treatment temperature of T-T yarn. The initial elasticity modulus of ITY was decreased with increasing over feed ratio and heat treatment temperature of T-T yarn. The tensile energy of fabrics was decreased with increasing of over feed ratio, but bending rigidity and shear rigidity of fabrics were increased with increasing of over feed ratio of PET filament. The results indicate that the fabric using T-T yarn with finer than I denier mono filament can be used for the purpose of sense-differentiated textile.

Development of Efficient Seismic Analysis Model using 3D Rigid-body for Wall-Frame Structures with an Eccentric Core (삼차원 T형강체를 이용한 편심코어를 가진 전단벽-골조 구조물의 효율적인 지진해석모델 개발)

  • Park, Yong-Koo;Lee, Dong-Guen;Kim, Hyun-Su
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.26 no.1
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    • pp.19-28
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    • 2013
  • In a shear wall-frame structural system, the structural response is determined by the interaction between the shear wall in bending mode and the frame in shear mode. In order to effectively consider these characteristics of a shear wall-frame structure, the simplified numerical model using the T-shape rigid body was suggested in the previous study. Based on the previously proposed model, an efficient numerical model for a wall-frame structure with an eccentric core has been proposed in this study. To this end, the previously proposed 2D model is extended to the 3D model and it is enhanced by considering torsion effects. As a result, the enhanced model can be applied to the analysis of a wall-frame structure with an eccentric core as well as a centric core.

A Finite Element Analysis of Incisors with Different Material Combinations of a Post and a Core (기둥(Post)과 핵(Core)의 이종재료 조합에 의한 치아의 유한요소해석)

  • Kang, Min-Kyu;Tak, Seung-Min;Lee, Seok-Soon;Seo, Min-Seock;Kim, Hyo-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.4
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    • pp.474-481
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    • 2011
  • The purpose of this study was to investigate the effect of rigidity of post core systems on stress distribution by the finite element stress analysis method. Three-dimensional finite element models simulating an endodontically treated maxillary central incisor restored with a zirconia crown were prepared. Each model contained cortical bone, trabecular bone, periodontal ligament, 4mm apical root canal filling, and post-and-core. A 50N static occlusal load was applied to the palatal surface of the crown with a $60^{\circ}$ angle to the long axis of the tooth. And three parallel type post (zirconia, glass fiber and stainless steel) and two core (Paracore and Tetric ceram) materials were evaluated, respectively. The differences in stress transfer characteristics of the models were analyzed. von Mises stresses were chosen for presentation of results and maximum displacement and hydrostatic pressure were also calculated. For the Result of the research, the model applied glass fiber to post material has lowest von Mises stress and it is suitable for material of post core systems.

Flexural Rigidity of MMA-Modified Fiberglass Reinforced Plastic Composite Pipe (MMA 개질 강화 플라스틱 복합관의 휨강성)

  • 연규석;최종윤;백종만;권택정;정중호
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.429-432
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    • 2003
  • MMA-modified fiberglass-reinforced plastic composite pipe was produced by using the binder of MMA-modified unsaturated polyester resin in which low viscosity MMA was added to unsaturated polyester resin. Sixteen specimens were made of polymer mortar and fiberglass-reinforced plastic by the centrifugal method. For these specimens the external strength tests were carried out by taking the core thickness consisting of polymer mortar and the fiberglass content per unit area as experimental variables to figure out the effect of variations of these variables influencing on flexural rigidity that is an important property for the composite pipe. Results of this study are believed to provide the basic data for more economical and practical design of MMA-modified fiberglass-reinforced plastic composite pipe.

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Parametric Study on the Design of Sandwich Beams and Plates for Machine Tool Structures (공작기계를 위한 보와 평판의 샌드위치 구조 설계에 관한 파라메트릭 연구)

  • Kim, Dae-Il;Chang, Seung-Hwan
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.1
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    • pp.39-48
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    • 2006
  • In this paper, polymer composites based sandwich structures like beams and plates are optimised by using parametric study. The structures are composed of fibre reinforced composites for facial material and resin concrete and PVC foam for core materials. The stacking sequences and thickness of the composites are controlled as major parameters to find out the optimal condition for machine tool components. For the plate structure of machine tool bed composites-skined sandwich structure which has several ribs are proposed to enhance bending stiffnesses in two major directions at the same time. Dynamic robustness of a machine tool structure is investigated using modal analysis. From the results optimal configuration and materials for high precesion machine tools are proposed. And the plate was made of fiber reforced composite material and PVC foam.

Effect of Normal and Shear Strains in Core Material on Vibrational Characteristics of Aluminum Honeycomb Core Sandwich Plate (심재의 수직 및 전단 변형을 고려한 알루미늄 하니컴코아 샌드위치 평판의 진동특성 해석)

  • 손충열;김익태;변효인
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.89-94
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    • 2000
  • Because the structural elements used in the automobile, astronautic and ship industries are put in dynamic loading environments, much interest is given to the damping of the structural elements, as well as high flexural rigidity and strength per density. Therefore, in this study, the structural damping value of the aluminum honeycomb sandwich plate(AHCP) has been experimentally extracted, and directly applied to the finite element, for the dynamic analysis of the plate considering the structural damping. The analysis results of this theory was compared with the results of the actual modal analysis method. It was observable that the two analyses concurred, establishing the structural damping and analysis method of the AHSP.

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A Study on The Physical Properties of Sheath/Core Type Nylon/PET High Hollow Composite Yarns and its Fabrics (Sheath/Core형 나일론/PET 고중공 복합사 및 직물물성 연구)

  • Kim, Seung-Jin;Park, Kyung-Soon;Jo, Jin-Hwang
    • Textile Coloration and Finishing
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    • v.21 no.4
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    • pp.1-10
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    • 2009
  • This paper surveys the physical properties of sheath/core nylon/PET high hollow composites filaments and its fabrics according to the various elution conditions such as concentration of elution, eluted time and eluted temperature. For this purpose, sheath/core nylon/PET filament was texturized and four kinds of fabric specimens were woven with different warp and weft densities. These grey fabrics were eluted with two kinds of concentrations of NaOH (30g/l, 40g/l), three kinds of eluted temperatures $50^{\circ}C,\;60^{\circ}C,\;85^{\circ}C$) and two kinds of eluted times (60min, l20min). The elution characteristics of these specimens were investigated and discussed with different elution conditions. In addition, the mechanical properties such as extensibility, bending rigidity, shear modulus and compressional work of these specimens aceording to the elution conditions were analysed and summarized with cross-sectional shapes of eluted filaments measured by SEM.