Design of wood-like metallic material using metal sheet architecture

Han Seong-Sik,Eom Hyun-jin,Lee Min-Su,Yim Tai-Hong,김흥규 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.5

This study proposed a new metal-based material design with a modulus of elasticity and thermal conductivity comparable to that of wood by architecturing of metal sheets. The proposed new material is designed in a form in which metal sheets of the same shape with beads are repeatedly stacked. In order to find a design with the target modulus of elasticity and thermal conductivity values, designs were derived using the Design of Experiment (DOE) and the material properties were predicted accordingly. For the prediction of material properties designed in the shape of a metal sheet architecture, finite element analysis combined with the homogenization method was used in consideration of the repeatability of the material microstructure. The reliability of the prediction of material properties based on the finite element analysis using a unit cell was verified by comparison with the results obtained from the compression test and the temperature wave method for the specimen. By analysing the modulus of elasticity and thermal conductivity data corresponding to the designs derived by DOE, we evaluated the effect of the design variables of the metal sheet architecture on the material properties. In addition, we investigated whether the material properties comparable to wood or leather were included within the derived design domain, and presented detailed design data of a metal sheet architecture that provides targeted material properties. It can be inferred from this study that the use of architecturing of metal sheets enables the development of new metal-based materials that can simulate the properties of other materials while utilizing the advantages of fire resistance and recyclability inherent in metals.

FRICTIONAL CHARACTERISTICS OF STEEL SHEETS USED IN AUTOMOTIVE INDUSTRY

T. TRZEPIECI SKI,A. BAZAN,H. G. LEMU 한국자동차공학회 2015 International journal of automotive technology Vol.16 No.5

In this paper the results of experimental tests aimed to determine the friction coefficient in sheet metal forming operations for various sheet metal materials and at different operative conditions are presented. The research has considered the frictional characterization of three kinds of drawing quality steels that are commonly used in automotive industry. These are a drawing quality steel (DQ), a deep drawing quality steel (DDQ), and extra deep drawing quality steel (EDDQ). For measurement of the sheet surface topography, a 3D stylus instrument Alicona InfiniteFocus was used. To determine the friction coefficient three tribological tests, i.e. a strip drawing test, a draw bead test and a pin-on-disc tribometer, have been conducted. The experimental results have ascertained several relationships showing the effect of sheet metal surface roughness, lubricant conditions and sheet orientation on the value of friction coefficient in sheet metal forming processes. The results further showed that the surface topography and sample orientation in the rolling direction of the sheet are significant factors that influence the friction coefficient. It was found that the tested steel sheets, selected from automotive industry applications, exhibit anisotropic resistance to the friction corresponding to the measured orientation in relation to the rolling direction of the sheet.

A Study on Metalwork design based on the Theory of Yin-Yang and Five Elements

Hyun,Jiyeon 국민대학교 동양문화디자인연구소 2011 Journal of Oriental Culture&Design Vol.3 No.2

This study is the report of my work’s background of creation, philosophy, logic, and so on. My pieces come from single sheets of metal. I am constantly amazed when a flat sheet of metal can miraculously be transformed into a three-dimensional form by a small touch of movement. I realize that a sheet of metal looking very two-dimensional, flat, rigid, strong, and angular has an opposite aspect at the same time; it can be made to look three-dimensional, flexible, soft, and natural. My work transforms a two-dimensional sheet of metal into a three-dimensional form. Through the process of cutting, bending, and hammering a single sheet of metal without addition or reduction, I construct new forms and spaces. This transformation is inspired by oriental philosophy, yin-yang and the five elements; wood, fire, earth, metal, water. I think that a single sheet of metal is yin-yang and the process of transforming is affected by the character of the five elements. In oriental philosophy, these five elements explain changing aspects of the universe, seasons, people and so on. My hollow silver forms embody my understanding of five elements. Every form shifts through undergoing the processes of rising, expanding, collecting, and floating energy. My work represents my philosophy of life. I transform the shapes from cold and inert sheets of metal to vigorous and spiritual forms. The addition of colour brings more vitality to the silver.

Fatigue analysis of chassis tubular torsion beam axle including the sheet metal forming effects

Balamurugan. R,Narayanan. R,Kee-June Moon,Chun Dal Park,Young Suk Kim 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Sheet-metal forming effects can strongly influence the fatigue life of sheet metal structures. The aim of this work is to develop an efficient and accurate method that enables design engineers to improve accuracy of fatigue simulations. It is achieved by result mapping technique which transfers the sheet metal forming results like forming residual stresses, thickness reduction, work hardening distribution to fatigue simulation model. A detailed description of this method is given below along with presentation of the car chassis torsion beam axle that has been used to estimate the potential gains. In this work the residual stresses and thickness reduction imposed by sheet metal forming process are taken into account to predict the fatigue life of the component. As a result it is found the residual stresses drastically reduce the fatigue life of the component compared to the effect on the same. This work uses the advantages of using different mesh configurations in forming and fatigue simulations by result mapping technique. In the automotive industry, it is expected that designers will profit from this coupled methodology that uses result mapping technique.

Deep drawing of polymer coated metal sheets

M. Emin Erdin,Ozgur Ozdilli 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11

In the present study, the deep drawing of polymer coated metallic sheets were experimentally investigated to reduce friction and increase manufacturing efficiency without using a lubricant. Coating of metal sheets with a polymer material before the deep drawing process provides numerous other advantages such as long service life, decorative appearance, corrosion protection, prevention of excessive abrasion. In the experiments, deep drawing ratio, blank holder pressure, and punch speed parameters were varied at various intervals and the obtained values were evaluated via graphs. Experiments of the uncoated metal sheets were conducted as well as the coated ones to compare the results. Results of this study showed that the polymer coating improved the surface quality of the test specimens. As a result of this improvement; the average molding forces decreased, obtained deep drawing ratios increased and defects such as tearing and wrinkling were alleviated by coating metal sheets with polymer material compared to uncoated sheets.

다층 EMI 차폐시트 및 자동화 장치 개발

김봉석 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.3

Multi-layered metal sheet for electromagnetic interference(EMI) shielding purpose has been designed using metal sheet, PET & DST stacking and laminating technology. Also, an automatic manufacturing system is developed. This metal sheet with multi-layered structure is an effective shield against EMI that can not shield completely by single metal sheet. And the developed automatic manufacturing system can stack and lamination thin metal sheets without any wrinkles.

다층 EMI 차폐재 및 자동화 장치 개발

김봉석(BongSeock Kim),오익수(Ik Soo Oh) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5

Multi-layered metal sheet for electromagnetic interference(EMI) shielding purpose has been designed using metal sheet stacking technology and an automatic manufacturing system is developed. This metal sheet with multi-layered structure is an effective shield against EMI that can not shield completely by single metal sheet. And the developed automatic manufacturing system can stack thin metal sheets without any wrinkles.

합성수지 메탈시트와 3면겹침용 채움재가 공법화된 합성고분자계 시트를 이용한 건식화 방수기술에 대한 실험적 연구

구자응 ( Koo Ja-ung ),김범수 ( Kim Bum-soo ),이정훈 ( Lee Jung-hun ),송제영 ( Song Je-young ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2

This technology employs a method of forming a single-ply PLUS waterproofing sheet layer comprised of applying a single-ply synthetic polymer layer on a vibrating structure (steel frame, RC) or an inclined surface by using a T joint lap-filling coil and an embedded metal coated sheet. The T - joint reinforcing lap-filling coil was used to block the ingress channel of the rainwater by applying the material in the vulnerable area where the three sides of the waterproof sheet overlapped. Conventional waterproofing techniques have a problem in that the waterproof sheet is pierced because the end portion of the waterproof sheet applied to the vertical portion is fixed by a nail, and the sealant applied to the end portion of the sheet cannot easily secure long-term waterproof durability due to the influence of the external environment. Therefore, the developed technology secured the waterproof durability against the vertical part by using the embedded metal sheet. In addition, automatic hot-air fusing is used to improve the quality of waterproof construction and point fixation method using fixed hardware. This is a technology that is not significantly restricted in the high degradation level regions of domestic waterproof construction environments in Korea such as low-temperature environment, wet floor.

Anisotropic Properties of Stainless Steel – Clad Aluminum Sheet

Daeyong Kim,Bum Kyu Hwang,Young Seon Lee,Ji Hoon Kim,Min-Joong Kim 한국소성가공학회 2010 기타자료 Vol.2010 No.6

The production of a stainless steel - clad aluminum sheet by the cold rolling process is a more efficient and economical approach compared with the other types of processes utilized for the production of such sheets. Because both the stainless steel and aluminum sheets show the highly anisotropic behavior, it is necessary to investigate anisotropic properties of clad sheets for the design of process. In this paper, to investigate the anisotropic properties of stainless steel ? clad aluminum sheet, two kinds of clad sheets were considered: STS439/AA3003 and STS439/AA1050/STS304 clad sheets. The uni-axial tension tests at 0, 45 and 90 degrees for the rolling direction were performed to obtained yield stresses and R values. The strain ratio at balanced biaxial tension state was measured from compression disk test. In order to describe the anisotropic behavior of the clad sheet, nonquadratic anisotropic yield function Yld2000-2d was utilized.

내부구조재를 가진 중공형 접합판재의 전단가공특성에서 틈새효과에 관한 연구

김지용,정완진,김종호,Kim, Ji-yong,Jung, Wan-jin,Kima, Jong-ho 한국금형공학회 2008 한국금형공학회지 Vol.2 No.1

While recent industrial structure is various, it is small quantity batch production structure, and products requiring of various functions are increasing. 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.