Journal of Powder Materials

Dong Jun Lee

3 Articles

[Korean]
Tomography-based Finite Element Analysis for the Mechanical Behavior of Porous Titanium Manufactured by a Space Holder Method: Dong Jun Lee, Dong-Hyun Ahn, Byounggab Lee, Jiwon Jeong, Sang Ho Oh, Chong Soo Lee, Hyoung Seop Kim; J Korean Powder Metall Inst. 2013;20(5):350-354.; DOI: https://doi.org/10.4150/KPMI.2013.20.5.350

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In this study, porous titanium samples were manufactured by space holder methods using two kinds of urea and sodium chloride space holders. Three-dimensional pore structures were obtained by a computed-tomography (CT) technique and utilized for finite element analysis in order to investigate the mechanical properties. The CT-based finite element analyses were in better agreement with the experimental results than unit cell model-based analyses. Both the experimental and CT-based results showed the same tendency that the elastic modulus decreased with increasing the porosities. The total porosity of the bulk body plays a key role in determining the elastic modulus of porous materials.

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Effect of track spacing on porosity of metallic foam fabricated by laser melting deposition of Ti6Al4V/TiH2 powder mixture
Ja-Ye Seo, Do-Sik Shim
Vacuum.2018; 154: 200. CrossRef
Additive manufacturing of porous metals using laser melting of Ti6Al4V powder with a foaming agent
Do-Sik Shim, Ja-Ye Seo, Hi-Seak Yoon, Ki-Yong Lee, Wook-Jin Oh
Materials Research Express.2018; 5(8): 086518. CrossRef

[Korean]
Obtaining Mechanical Properties of Fe Powder Using a Combined Nanoindentation and the Finite Element Method: Hyeok Jae Jeong, Dong Jun Lee, Eun Yoo Yoon, Eon Sik Lee, Nack Joon Kim, Hyeong Seop Kim; J Korean Powder Metall Inst. 2013;20(4):280-284.; DOI: https://doi.org/10.4150/KPMI.2013.20.4.280

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Abstract PDF: Stress-strain curves are fundamental properties to study characteristics of materials. Flow stress curves of the powder materials are obtained by indirect testing methods, such as tensile test with the bulk materials and powder compaction test, because it is hard to measure the stress-strain curves of the powder materials using conventional uniaxial tensile test due to the limitation of the size and shape of the specimen. Instrumented nanoindentation can measure mechanical properties of very small region from several nanometers to several micrometers, so nanoindentation technique is suitable to obtain the stress-strain curve of the powder materials. In this study, a novel technique to obtain the stress-strain curves using the combination of instrumented nanoindentation and finite element method was introduced and the flow stress curves of Fe powder were measured. Then obtained stress-strain curves were verified by the comparison of the experimental results and the FEA results for powder compaction test.

[Korean]
Trend in Research of Powder Consolidation Using Severe Plastic Deformation: Eun Yoo Yoon, Dong Jun Lee, Dong-Hyun Ahn, Hyuk Jae Jeong, Hyoung Seop Kim; J Korean Powder Metall Inst. 2013;20(2):148-154.; DOI: https://doi.org/10.4150/KPMI.2013.20.2.148

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Analyses of Sever Plastic Deformation Behavior of Hot Isostatic Pressed Ni-base Superalloy during High Pressure Torsion Process
D.J. Lee, Y. Lee, H.-K. Kim, Y.-N. Kwon, H.S. Kim, E.Y. Yoon
Transactions of Materials Processing.2016; 25(4): 254. CrossRef

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