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Investigation of Buckling Knockdown Factors for Pressurized Metallic Cylinders Using Various Numerical Modeling Techniques of Initial Imperfections

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Abstract

Nonlinear postbuckling analyses are conducted to investigate the buckling KnockDown Factors (KDF) for pressurized metallic cylinders. The nonlinear analysis code, ABAQUS, is used to the postbuckling analyses. Various numerical modeling techniques are used to represent the initial imperfections of a cylinder. Measured Geometric Imperfection (MGI) and Single (or Multiple) Perturbation Load Approaches (SPLA or MPLA) are considered to model the geometric initial imperfection modeling techniques, and Single Boundary Perturbation Approach (SBPA) is used to represent the boundary imperfection modeling technique. When the internal pressures of 0 and 40 kPa, the SPLA can provide less conservative KDFs. However, the robust KDFs for the cylinder subjected to an internal pressure of 100 kPa are derived using the SBPA. These results show that the initial imperfection modeling must be appropriately selected considering the internal pressure levels of the thin-walled cylinder.

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Acknowledgements

This work was supported by research on the Korea Space Launch Vehicle (KSLV-II) funded by the Ministry of Science and ICT (MSIT, Korea). The work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2022M1A3B8076744). The work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2022M1A3B8076744).

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Authors and Affiliations

  1. Chungnam National University, Daejeon, 34134, Republic of Korea

    Chang-Hoon Sim, Min-Hyeok Jeon, Jae-Sang Park & In-Gul Kim

  2. Korea Aerospace Industries, Sacheon, 52529, Republic of Korea

    Do-Young Kim

  3. Korea Aerospace Research Institute, Daejeon, 34133, Republic of Korea

    Joon-Tae Yoo, Young-Ha Yoon & Keejoo Lee

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Correspondence to Jae-Sang Park.

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Sim, CH., Kim, DY., Jeon, MH. et al. Investigation of Buckling Knockdown Factors for Pressurized Metallic Cylinders Using Various Numerical Modeling Techniques of Initial Imperfections. Int. J. Aeronaut. Space Sci. 25, 698–715 (2024). https://doi.org/10.1007/s42405-023-00667-4

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