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http://dx.doi.org/10.5139/JKSAS.2020.48.9.653

Postbuckling Analyses and Derivations of Shell Knockdown Factors for Isogrid-Stiffened Cylinders Under Compressive Force and Internal Pressure  

Kim, Han-Il (Chungnam National University)
Sim, Chang-Hoon (Chungnam National University)
Park, Jae-Sang (Chungnam National University)
Kim, Do-Young (Chungnam National University)
Yoo, Joon-Tae (Korea Aerospace Research Institute)
Yoon, Young-Ha (Korea Aerospace Research Institute)
Lee, Keejoo (Korea Aerospace Research Institute)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.48, no.9, 2020 , pp. 653-661 More about this Journal
Abstract
This study derives numerically the shell Knockdown factors for the isogrid-stiffened cylinders of space launch vehicles when the axially compressive force and internal pressure are applied simultaneously. A commercial nonlinear finite element analysis software, ABAQUS, is used for the present work. Nonlinear postbuckling analyses are conducted to calculate the global buckling loads of a cylinder without and with the internal pressure. The shell Knockdown factor is numerically derived using the predicted global buckling loads without and with the geometrically initial imperfection of a cylinder. When the internal pressure of 500 kPa and compressive force are applied to the cylinder, the global buckling load and Knockdown factor increases by 304% and 53%, respectively, as compared to the results without the internal pressure.
Keywords
Launch Vehicle; Isogrid-stiffened Cylinder; Internal Pressure; Knockdown Factor; Postbuckling Analysis;
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Times Cited By KSCI : 1  (Citation Analysis)
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