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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 18, Issue 8 - Dec 2009
Volume 18, Issue 7 - Nov 2009
Volume 18, Issue 6 - Oct 2009
Volume 18, Issue 5 - Aug 2009
Volume 18, Issue 4 - Jul 2009
Volume 18, Issue 3 - Jun 2009
Volume 18, Issue 2 - Apr 2009
Volume 18, Issue 1 - Feb 2009
Selecting the target year
Recent Tendency of Mold Steel in Japan
Yokoi, D. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 5~12
DOI : 10.5228/KSPP.2009.18.1.005
Characteristics of Bending Deformation in Aluminum Rectangular Bar by Press Die
Kim, K.S. ; Hur, K.D. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 13~19
DOI : 10.5228/KSPP.2009.18.1.013
In the recent years, the production of light-weight products has become important because of increasing demands for the energy savings through weight reduction. Therefore the advanced manufacturing technology with Al alloy is continuously required in many industrial fields. Bending characteristics of Al rectangular tube with hollow and solid section has been analyzed by FE analysis in press bending with wing-die. Bending stress is affected by punch stroke and rotation of wing-die. There were different sectional sagging characteristics between the solid rectangle section and the hollow rectangle section.
Flow-Induced Birefringence of Polymers in the Region of Abrupt Thickness Transition
Lee, H.S. ; Isayev, A.I. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 20~25
DOI : 10.5228/KSPP.2009.18.1.020
A finite element analysis was carried out for a 4:1 planar contraction die for polymer melts using the viscoelastic constitutive equation of Leonov. Viscoelastic fluids showed significant differences in pressure drop and birefringence in contraction and expansion flows. The pressure drop was higher and the birefringence smaller in expansion than in contraction flow. The difference increased with increasing flow rate. The nonlinear Leonov model was shown to describe the viscoelastic effects observed in experiments.
Dynamic Simulation of Solid Particle Considering Change by Viscosity in Rheology Material
Kwon, K.Y. ; Kang, C.G. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 26~38
DOI : 10.5228/KSPP.2009.18.1.026
It was reported that the semi-solid forming process has many advantages over the conventional forming process, such as a long die life, good mechanical properties and energy savings. It is very important, however, to control liquid segregation to gain mechanical property improvement of materials. During forming process, rheology material has complex characteristics, thixotropic behavior. Also, difference of velocity between solid and liquid in the semi-solid state material makes a liquid segregation and specific stress variation. Therefore, it is difficult for a numerical simulation of the rheology process to be performed. General plastic or fluid dynamic analysis is not suitable for the behavior of rheology material. The behavior and stress of solid particle in the rheology material during forging process is affected by viscosity, temperature and solid fraction. In this study, compression experiments of aluminum alloy were performed under each other tool shape which is rectangle shape(square array), rectangle shape(hexagonal array), and free shape tool. In addition, the dynamics behavior compare with Okano equation to power law model which is viscosity equation.
A Study on the Forming of Automotive Front Side Member Part with Ultra High Strength Steel of DP980
Cha, C.H. ; Lee, S.K. ; Ko, D.C. ; Kim, B.M. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 39~44
DOI : 10.5228/KSPP.2009.18.1.039
This paper is concerned with forming technology of an automotive front side member part with ultra high strength steel sheet of DP980. The forming technology considered in this paper is the draw & form type, which installs the upper pad and lower pad to produce the complicated shape of ultra high strength steel sheet. In order to produce sound product, comparison between form type and draw & form type and between draw type and draw & form type are investigated by FE-analysis. FE-analysis is carried out with commercial sheet metal forming analysis S/W, DYNAFORM. It was shown from FE-analysis that the draw & form type satisfied the required specifications such as the dimensional accuracy and soundness of automotive front side member part. The effectiveness of the analytical result was verified by the experiment. From this investigation, the draw & form type is proved to be able to supply useful forming technology in forming ultra high strength steel.
Fabrication and Mechanical Properties of TiNi/Al2024 Composites by Hot-Press Method
Son, Yong-Kyu ; Bae, Dong-Su ; Park, Young-Chul ; Lee, Gyu-Chang ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 45~51
DOI : 10.5228/KSPP.2009.18.1.045
Shape memory alloy has been used to improve the tensile strength of composite by the occurrence of compressive residual stress in matrix using its shape memory effect. In order to fabricate shape memory alloy composite, TiNi alloy fiber and Al2024 sheets were used as reinforcing material and matrix, respectively. In this study, TiNi/Al2024 shape memory alloy composite was made by using hot press method. In order to investigate bonding condition between TiNi reinforcement and Al matrix, the micro-structure of interface was observed by using optical microscope and diffusion layer of interface was measured by using Electron Probe Micro Analyser. And the mechanical properties of composite with three parameters(volume fraction of fiber, cold rolling amount and test temperature) were obtained by tensile test. The most optimum bonding condition for fabrication the TiNi/Al2024 composite material was obtained as holding for 30min. under the pressure of 60MPa at 793K. The strength of composite material increased considerably with the volume fraction of fiber up to 7.0%. And the tensile strength of this composite increased with the reduction ratio and it also depends on the volume fraction of fiber.
Design of the Anvil Shape in Sizing Press for Decrease of the Defect Generated Width Reduction
Lee, S.H. ; Lee, S.J. ; Lee, J.B. ; Kim, B.M. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 52~58
DOI : 10.5228/KSPP.2009.18.1.052
Generally, a vertical rolling process is used to achieve extensive width reduction in hot strip mill. However, it is impossible to avoid the defects such as dog-bone and edge-seam defect. The sizing press process has been developed in response to the defects mentioned above. Especially, this study is carried out to investigate the deformation of slab by two-step sizing press. The deformation behavior of slab in the sizing press process is more favorable than that in conventional vertical rolling edger. The FE-simulation is applied to predict the deformation behavior of the slab. In this paper, the several causes of the asymmetrical deformation are mentioned for the purpose of understanding of the anvil shape. Load, dog-bone and edge-seam defect are discussed in width sizing process considering the anvil shape. And to reduce the problems generated at rougher mill just after sizing press, these are studied in this paper. The deformation behavior of slabs and optimum anvil shape are obtained by rigid-plastic finite element analyses and neural network.
Study on Bursting Prediction of Rectangular Battery Case with V-Notch
Kim, S.M. ; Song, W.J. ; Ku, T.W. ; Kim, J. ; Kang, B.S. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 59~66
DOI : 10.5228/KSPP.2009.18.1.059
In this study, V-notch part has been considered as one of safety components in rectangular cup used for mobile device. This kind of safety component in rectangular cup with the V-notch part, which controls adequately the increased internal pressure in the rectangular cup, plays an important role to prevent the explosion from the excessive internal pressure. The protecting mechanism on the mobile device against the explosion is that a series of fracture on the V-notch part at the critical internal pressure level occurs. Therefore, it is very crucial to estimate accurately the working pressure range of the safety device. Relationship between the working internal pressure and fracture phenomenon at V-Notch part was investigated through numerical analysis using ductile fracture criteria. Integral value, I, of the used ductile fracture criteria was calculated from effective stress and strain, and then the bursting pressure of the V-notch part was extracted. Comparisons between the estimated and experimental results show that this systematic approach to predict bursting pressure using the ductile fracture criteria gives fairly good agreements.
Optimization of the Tube Bending Process of Taguchi's Orthogonal Matrix
Yin, Z.H. ; Chae, M.S. ; Moon, K.J. ; Kim, Y.S. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 67~72
DOI : 10.5228/KSPP.2009.18.1.067
This paper covers finite element simulations to evaluate tube bending process of auto chassis component i.e. trailing-arm product. The rear of the auto chassis structure is primarily composed of CTBA and trailing-arm. When a car rolls into a corner, the trailing arm reacts to roll in the same degree as the car body. During the bending process of trailing arm the tube undergoes significant deformation. Thus forming defects such as excessive thinning and flattening of the tube will be formed in the outside of the tube. In this paper, we analyzed the effect of process parameters in rotary draw bending process and searched the optimized combination of process parameters using orthogonal arrays method to minimize the forming defects. In this process we analyzed several parameters which are displacement of pressure die, boosting force, initial position of mandrel bar, dimensions of mandrel in regarding to the thinning and flattening of the tube.
Experimental Formability Investigation for FSW Sheets with Respect to Base Material's Directional Combination
Kim, Dae-Yong ; Lee, Won-Oh ; Kim, June-Hyung ; Kim, Chong-Min ; Chung, Kwan-Soo ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 73~79
DOI : 10.5228/KSPP.2009.18.1.073
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.
Influence of Process Parameters on the Forming Compatibility in Composite Extrusion Rods
Jang, D.H. ;
Transactions of Materials Processing, volume 18, issue 1, 2009, Pages 80~86
DOI : 10.5228/KSPP.2009.18.1.080
This paper presents the plastic inhomogeneous deformation behavior of bimetal composite rods during the axisymmetric and steady-state extrusion process through a conical die. The rigid-plastic FE model considering frictional contact problem was used to analyze the co-extrusion process with material combinations of Cu/Al. Different cases of initial geometry shape for composite material were simulated under different conditions of co-extrusion process, which includes the interference and frictional conditions. From the simulation results, the sleeve cladding rate at the core/sleeve interface was recorded as a distribution of diameter ratio and interference conditions, which will be useful for the investigations of the bonding process during co-extrusion process. In addition, the results of the co-extrusion, connected with the results of the variations of diameter rate and average contact pressure, demonstrate a good agreement and present the possibility of describing the parameters of the plastic zones in non-uniform deformation of these type of composite materials.