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Effect of target-fixture geometry on shock-wave compacted copper powders

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Abstract

In shock compaction with a single gas gun system, a target fixture is used to safely recover a powder compact processed by shock-wave dynamic impact. However, no standard fixture geometry exists, and its effect on the processed compact is not well studied. In this study, two types of fixture are used for the dynamic compaction of hydrogen-reduced copper powders, and the mechanical properties and microstructures are investigated using the Vickers microhardness test and electron backscatter diffraction, respectively. With the assistance of finite element method simulations, we analyze several shock parameters that are experimentally hard to control. The results of the simulations indicate that the target geometry clearly affects the characteristics of incident and reflected shock waves. The hardness distribution and the microstructure of the compacts also show their dependence on the geometry. With the results of the simulations and the experiment, it is concluded that the target geometry affects the shock wave propagation and wave interaction in the specimen.

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Authors and Affiliations

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

    Wooyeol Kim, Jae Ik Yoon & Hyoung Seop Kim

  2. Nuclear Materials Safety Research Division, Korea Atomic Energy Research Institute (KAERI), Daejeon, 34057, Republic of Korea

    Dong-Hyun Ahn

  3. The 4th R&D Institute, Agency for Defense Development (ADD), Daejeon, 34186, Republic of Korea

    Lee Ju Park

  4. Center for High Entropy Alloy, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Hyoung Seop Kim

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  1. Wooyeol Kim
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  2. Dong-Hyun Ahn
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  3. Jae Ik Yoon
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  4. Lee Ju Park
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  5. Hyoung Seop Kim
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Correspondence to Hyoung Seop Kim.

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Kim, W., Ahn, DH., Yoon, J.I. et al. Effect of target-fixture geometry on shock-wave compacted copper powders. Met. Mater. Int. 24, 84–94 (2018). https://doi.org/10.1007/s12540-017-7344-y

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  • DOI: https://doi.org/10.1007/s12540-017-7344-y

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