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Physics-Based Constitutive Model of Porous Materials for Die/Isostatic Compaction of Metallic Powders

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Abstract

A physics-based constitutive model of porous materials is proposed to enhance the accuracy of numerical analysis in die/isostatic compaction. The correlation between the yield function and equivalent work equation was derived, and the numerical integration method was modified with the correlation. It is found that the apparent work of porous materials is lower than the product of relative density and equivalent work of solid materials at the beginning of compaction, implying the kinematic motion of powders and the resultant particle rearrangement. For verification of the proposed model, finite element analyses were performed for the die/isostatic compaction of three metal powders: Ti, SUS316L, and Al6061 powders. Compared with two conventional constitutive models, the proposed model improves the accuracy of the densification behaviors in all the stage during die/isostatic compaction. Furthermore, this study is a groundwork to link the densification behavior of porous materials at bulk scale to the particulate behavior of powders at microscale.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2017R1A2A1A17069427).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea

    Yujin Seong, Dami Yim, Min Ji Jang, Jeong Min Park & Hyoung Seop Kim

  2. Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea

    Seong Jin Park

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  1. Yujin Seong
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  2. Dami Yim
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Correspondence to Hyoung Seop Kim.

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Seong, Y., Yim, D., Jang, M.J. et al. Physics-Based Constitutive Model of Porous Materials for Die/Isostatic Compaction of Metallic Powders. Met. Mater. Int. 26, 221–229 (2020). https://doi.org/10.1007/s12540-019-00317-z

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