• Title/Summary/Keyword: Woven Metal

Search Result 62, Processing Time 0.027 seconds

Basic Study in Fabrication and Mechanical Characteristics of Ultra Light Inner Structured and Bonded(ISB) Panel Containing Perpendicularly Woven Metal (수직방향 직조 금속망을 이용한 초경량 금속 내부구조 접합판재의 제작 및 특성에 관한 기초 연구)

  • Jung Chang Gyun;Yoon Seok-Joon;Yang Dong-Yol;Lee Sang Min;Na Suck-Joo;Lee Sang-hoon;Ahn Dong-Gyu
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.22 no.5 s.170
    • /
    • pp.152-158
    • /
    • 2005
  • Inner structured and bonded panel, or ISB Panel, as a kind of sandwich type panel, has metallic inner structures which have low relative density, due to their dimensional shape of metal between a pair of metal skin sheets or face sheets. Previous works showed that ISB panels containing inner structures formed as repeated pyramidal shapes saved weight up to $60\%$ in condition of same stiffness comparing with solid sheet. In this work, woven metal is adapted to inner structures replacing pyramidal structures. The test specimens of ISB panel containing woven metal made by multi-point electric resistance welding and 3-point bending test have been carried out. The results of experiments and comparisons of process parameters, stiffness and failure mode are discussed.

Investigation into characteristics of bending stiffness and failure for ISB panel (ISB 판넬의 굽힘강성 및 파단특성에 관한 연구)

  • 안동규;이상훈;김민수;한길영;정창균;양동열
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2004.10a
    • /
    • pp.1274-1277
    • /
    • 2004
  • The objective of this research work is to investigate into characteristics of bending stiffness and failure for the ISB ultra-lightweight panel with internally structured material. The expanded metal with a pyramid shape and woven metal are employed as an internally structured material. In order to investigate the characteristics, the specific stiffness and failure map are estimated using the results of three-points bending test. From the results of the experiment, the influence of design parameters of ISB panel on the specific stiffness and failure mode has been found. In addition, it has been shown that ISB panel with expanded metal is prefer to that with woven metal from the view point of optimal design for ISB panel.

  • PDF

Optimal design of an Wire-woven Bulk Kagome using taguchi method (다구찌법을 이용한 WBK(Wire-woven Bulk Kagome)의 최적설계)

  • Choi, Ji-Eun;Kang, Ki-Ju
    • Proceedings of the KSME Conference
    • /
    • 2008.11a
    • /
    • pp.13-19
    • /
    • 2008
  • A Wire-woven Bulk Kagome (WBK) is the new truss type cellular metal fabricated by assembling the helical wires in six directions. The WBK seems to be promising with respect to morphology, fabrication cost, and raw materials. In this paper, first, the geometric and material properties are defined as the main design parameters of the WBK considering the fact that the failure of WBK is caused by buckling of truss elements. Taguchi approach was used as statistical design of experiment(DOE) technique for optimizing the design parameters in terms of maximizing the compressive strength. Normalized specific strength is constant regardless of slenderness ratio even if material properties changed, while it increases gradually as the strainhardening coefficient decreases. Compressive strength of WBK dominantly depends on the slenderness ratio rather than one of the wire diameter, the strut length. Specifically the failure of WBK under compression by elastic buckling of struts mainly depended on the slenderness ratio and elastic modulus. However the failure of WBK by plastic failed marginally depended on the slenderness ratio, yield stress, hardening and filler metal area.

  • PDF

Compressive Characteristics of New Wire-woven Cellular Metal (새로운 와이어 직조 다공질 금속의 압축 특성)

  • Ko, Gyeong-Deuk;Lee, Ki-Won;Kang, Ki-Ju
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.34 no.11
    • /
    • pp.1659-1666
    • /
    • 2010
  • In this study, a new type of wire-woven cellular metal named WBD(wire-woven bulk diamond) was developed. Like WBK(wire-woven bulk Kagome), WBD is composed of helically formed wires; WBK was introduced a few years ago, and its mechanical, thermal properties, and engineering applications have been extensively investigated. The number of wires that pass by one another at each cross point in WBD is four, whereas that in WBK is three. The mechanical behavior of WBD subjected to compression was investigated and the results were compared to those for WBK. For a given slenderness ratio the density and yield strength of WBD were about twice as high as those for WBK, but elastic stiffness of WBD was not that higher than that for WBK.

Investigation into Characteristics of Bending Stiffness and Failure for ISB Panel (ISB 판넬의 굽힘강성 및 파손특성에 관한 연구)

  • Ahn Dong-Gyu;Lee Sang-Hoon;Kim Min-Su;Han Gil-Young;Jung Chang-Gyun;Yang Bong-Yol
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.22 no.9 s.174
    • /
    • pp.162-172
    • /
    • 2005
  • The objective of this research works is to investigate into characteristics of bending stiffness and failure for the ISB ultra-lightweight panel with internally structured material. The expanded metal with a crimped pyramid shape and woven metal are employed as an internally structured material. Through three-points bending test, the force-displacement curve and failure shape are obtained to examine the deformation pattern, characteristic data, such as maximum load, displacement at maximum load, etc, and failure pattern of the ISB panel. In addition, the influence of design parameters fur ISB panel on the specific stiffness, the specific stiffness per unit width, failure mode and failure map has been found. Finally, it has been shown that ISB containing expand metal with the crimped pyramidal shape is prefer to that containing woven metal from the view point of optimal design for ISB panel.

A Study on the Shear Deformation Behavior of Inner Structure-Bonded Sheet Metal (접합판재의 전단 변형거동에 관한 연구)

  • Kim J. Y.;Chung W. J.;Yang D. Y.;Kim J. H.
    • Transactions of Materials Processing
    • /
    • v.14 no.3 s.75
    • /
    • pp.257-262
    • /
    • 2005
  • In order to improve the quality of the sheared surface in cutting of inner structure bonded sheet metal the cut-off operation is mainly investigated, which is the typical shearing process in sheet metal forming technology. The sandwich sheet metals considered have inner structure which is constructed in the form of crimped expanded metal and woven metal. The inner structure is bonded between solid sheet by resistance welding or adhesive bonding. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface is measured and quantitatively compared with the help of the optical microscope after cut-off operation. From test results we found that the influence of sheared position can be observed and explained clearly and this result can be utilized to get the better sheared surface.

A Study on the Shear Deformation Behavior of Inner Structure-Bonded sheet metal (접합판재의 전단 변형거동에 관한 연구)

  • Kim J. Y.;Kim J. H.;Chung W. J.;Yang D. Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2004.11a
    • /
    • pp.33-38
    • /
    • 2004
  • In order to improve the quality of the sheared surface in cutting of inner structure bonded sheet metal the cut-off operation is mainly investigated, which is the typical shearing process in sheet metal forming technology. The sandwich sheet metals considered have inner structure which is constructed in the form of crimped expanded metal and woven metal. The inner structure is bonded between solid sheet by resistance welding or adhesive bonding. The shearing process is visualized by the computer vision system installed in front of the cut-off die and the sheared surface is measured and quantitatively compared with the help of the optical microscope after cut-off operation. From test results we found that the influence of sheared position can be observed and explained clearly and this result can be utilized to get the better sheared surface.

  • PDF

A Wire-Woven Kagome Transformed to have a Negative Poisson's Ratio (음의 푸아송비를 갖도록 변환된 와이어 직조 Kagome)

  • Kang, Dae Seung;Han, Seung Chul;Park, Jong Woo;Nguyen, Dang Ban;Kang, Kiju
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.40 no.9
    • /
    • pp.827-833
    • /
    • 2016
  • Wire-woven Kagome is a kind of Periodic Cellular Metal, which is known to have high strength, stiffness for its weight, and potential for mass production. In this work, we developed a new structure that mimics ${\alpha}$-cristobalite. First, an ordinary wire-woven Kagome was fabricated using metallic wires, and the tetrahedral cells were then filled with metal balls and epoxy. The wire-woven Kagome was transformed to have a negative Poisson's ratio by carrying out a specified amount of initial deformation. The fabrication possibility and kinematic behavior were checked by using FEA simulation. Finally, the mechanical properties were measured using compressive tests.

Estimation of Young's and Shear Moduli of a Core in ISB Panel with Woven Metal as Inner Structures (망형 직조 금속을 내부구조체로 가진 ISB 판재의 심재 종탄성 및 전단 계수 예측)

  • Ahn, Dong-Gyu;Nam, Gyung-Heum;Jung, Chang-Gyun;Yang, Dong-Yol
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.26 no.11
    • /
    • pp.116-123
    • /
    • 2009
  • The elastic properties of core affect mechanical properties and deformation behaviours of the lightweight sandwich panel. The objective of the present paper is to estimate experimentally Young's and shear moduli of a core in internally structured boned (ISB) panel with woven metal as inner structures using the deflection theory of sandwich beam considered core stiffness. Three points bending experiments were performed to obtain force-deflection curves of the designed ISB panel in each material direction. The elastic and shear moduli of the core in each material direction were estimated from slopes and intercepts of relationships between compliance per the span length and square of the span length, respectively. The results of the estimation showed that the fabric technology of the woven metal affects the variation of the elastic properties in the core. Through the comparison of shear moduli and force-deflection curves of the proposed method and those without considering the core stiffness, it was shown that the core stiffness should be considered to estimate properly the Young's and shear moduli of ISB panels. Finally, the contribution ratio of bending and shear deflections of ISB panels to the total deflection was quantitatively examined.