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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of Materials Processing
Journal Basic Information
Journal DOI :
The Korean Society for Technology of Plasticity
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Volume & Issues
Volume 20, Issue 8 - Dec 2011
Volume 20, Issue 7 - Nov 2011
Volume 20, Issue 6 - Oct 2011
Volume 20, Issue 5 - Aug 2011
Volume 20, Issue 4 - Jul 2011
Volume 20, Issue 3 - Jun 2011
Volume 20, Issue 2 - Apr 2011
Volume 20, Issue 1 - Feb 2011
Selecting the target year
Historical Background and Study of Advance in Engineering in Europe and USA
Lee, Y. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 393~408
DOI : 10.5228/KSTP.2011.20.6.393
Numerical Analysis and Experimental Evaluation on Formability of Membrane for LNG Storage Tank
Noh, H.G. ; Jung, J.Y. ; Ku, T.W. ; Kang, B.S. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 409~419
DOI : 10.5228/KSTP.2011.20.6.409
Membrane structures are widely used for LNG(Liquefied Natural Gas) storage tanks. This study presents a membrane structure based on the Mark-III type. For its development, a series of numerical simulation was conducted using ABAQUS and experimental investigation was carried out. The manufacturing process of the membrane was simulated. The thickness distribution predicted by the numerical approach agreed well with the experimental results.
Forming Condition for Automotive Body Outer Panel using Aluminum Alloy Sheet for Improved Dent Resistance
Ko, S.J. ; Kim, T.J. ; Kim, I.S. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 420~426
DOI : 10.5228/KSTP.2011.20.6.420
Dent resistance is determined by both shape characteristics, i.e., local radius of curvature and sheet thickness, and material properties such as yield strength. This work presents results of a study on the effect of work hardening and bake hardening on dent resistance of aluminum alloy sheet parts by considering the forming condition and baking temperature.
A Local Softening Method for Reducing Die Load and Increasing Service Life in Trimming of Hot Stamped Part
Choi, H.S. ; Lim, W.S. ; Kang, C.G. ; Kim, B.M. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 427~431
DOI : 10.5228/KSTP.2011.20.6.427
In general, hot stamped component is trimmed by costly and time consuming laser cutting when the material strength is over 1,500MPa. The aim of this work was to demonstrate that the trimming die life is improved and the trimming load is decreased by lowering the strength of the region to be trimmed. The model employed in this study was a hat shape, similar to the cross section of many hot stamped products. FE-analysis of hot stamping process was performed to evaluate the effect of tool shape on cooling rate at the area to be trimmed. The best tool shape was thus identified, which created slower cooling and lower hardness at the region to be trimmed. The wear at the cutting tool edge was also reduced.
Shear Spinning of Ti-6Al-4V Alloy at Hot Working Temperature
Lee, H.S. ; Song, Y.B. ; Hong, S.S. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 432~438
DOI : 10.5228/KSTP.2011.20.6.432
A method for estimating the shear spinnability is suggested, and it was applied to sheets of Ti-6Al-4V alloy for estimation of shear spinnability at hot working temperature. The effective working temperature was
or above. The hot spinning operation was carried out in two steps of shear spinning. The reduction of thickness at the first step was 50% and 45% at the second, and the overall reduction of thickness was 72.4%. The cone spinning process could produce a uniform wall thickness with only a few percent tolerance, proving itself appropriate for making cones of Ti-6Al-4V alloy with uniform wall thickness.
Deformation Technology for Thick Plate Using Single Pass Line Heating by High Frequency Induction Heating
Lee, K.S. ; Eom, D.H. ; Kim, C.W. ; Pyun, S.Y. ; Son, D.H. ; Gong, G.Y. ; Kim, B.M. ; Lee, J.H. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 439~449
DOI : 10.5228/KSTP.2011.20.6.439
The temperature distribution and subsequent permanent deformation of SS400 carbon steel plate subjected to an induction-based line heating process were studied by a numerical method involving coupled 3-D electromagnetic-thermal-structural analysis. The numerical study revealed that the amount of permanent deformation is strongly related to the Joule loss caused by such process conditions as input power and moving speed of the heat source. To validate the numerical analysis results, line heating experiments were carried out with a high frequency(HF) induction heating(IH) equipment capable of bending thick plate with the moving accuracy of
in heating coil position. The amount of permanent deformation increased with decreasing moving speed and increasing input power.
Prediction of Initial Design Parameter of Rectangular Shaped Mold Spring Using Finite Element Method
Lee, H.W. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 450~455
DOI : 10.5228/KSTP.2011.20.6.450
This paper presents an inverse design methodology for the cross section geometry of mold spring with a rectangular cross section as the starting material for a coiling process. The cross-sections of mold springs are universally rectangular, as the parallel sides minimize the possibility of failure under high service loads. Pre-coiled wires are initially designed to have a trapezoidal cross section, which becomes a rectangle by the coiling process. This study demonstrates a numerical exercise to predict changes in the sectional geometry in spring manufacture and to obtain the initial cross section which becomes the exact rectangle desired from the manufacturing process. Finite element analysis was carried out to calculate the sectional changes for various mold springs. Geometrical parameters were the widths at inner and outer radii, the inner and the outer corner radii, and the height. A partial least square regression analysis was carried out to find the main contributing factors for deciding initial design values. The height and the width mainly affected various initial parameters. The initial width at the inner radius was mostly affected by various specification parameters.
Quantitative Analysis of Elastic Recovery Behavior after Bending of Ultra High Strength Steel Sheet: Spring-back or Spring-go
Kwak, E.J. ; Lee, K. ; Suh, C.H. ; Lim, Y.H. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 456~460
DOI : 10.5228/KSTP.2011.20.6.456
A major source of difficulty in die design for high strength steel is the high level of elastic recovery during unloading. The degree of elastic recovery is affected by factors such as material strength, bending angle, punch's corner radius and sheet thickness. Finite Element Method was used in the present work to quantitatively analyze the elastic recovery for various combinations of these parameters. In some cases elastic recovery happened in reverse direction. This phenomenon, which we call spring-go, was explained via changes in stress distribution in the panel occurring in the forming process.
Precision Simulation of Drawing Processes Considering Back Pressing or Tension with Artificial Body Force Scheme
Eom, J.G. ; Shim, S.H. ; Cho, J.M. ; Kim, H.S. ; Joun, M.S. ;
Transactions of Materials Processing, volume 20, issue 6, 2011, Pages 461~467
DOI : 10.5228/KSTP.2011.20.6.461
An artificial body force method is presented to accurately simulate drawing processes in which back pressing is exerted. A rigid-plastic finite element method is applied together with a numerical scheme to eliminate the numerically incurred plastic deformation in rigid or elastic region, which significantly influences simulation results because it eventually changes reduction of area in drawing. Back tension or compression is applied by body force at the rear part of material to obtain numerically stable solution. Two typical examples are shown, a drawing process with back tension applied and a tube drawing with a fixed plug and back pressing applied.