Numerical Derivation of Buckling Knockdown Factors for Isogrid-Stiffened Cylinders with Various Shell Thickness Ratios
Joint Authors
Sim, Chang-Hoon
Kim, Han-Il
Park, Jae-Sang
Lee, Keejoo
Yoo, Joon-Tae
Yoon, Young-Ha
Source
International Journal of Aerospace Engineering
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-05-11
Country of Publication
Egypt
No. of Pages
14
Abstract EN
This study is aimed at providing a numerical derivation of the shell knockdown factors of isogrid-stiffened cylinders under axial compressive loads.
The present work uses two different analysis models such as the detailed model with modeling of numerous stiffeners and the equivalent model without modeling of stiffeners for isogrid-stiffened cylinders.
The single perturbation load approach is used to represent the geometrically initial imperfection of the cylinder.
Postbuckling analyses using the displacement control method are conducted to calculate the global buckling loads of a cylinder.
The shell knockdown factor is numerically derived using the obtained global buckling loads without and with the initial imperfection of the isogrid-stiffened cylinder.
The equivalent model is more efficient than the detailed model in terms of modeling time and computation time.
The present knockdown factor function in terms of the shell thickness ratio (radius to thickness) for the isogrid-stiffened cylinder is significantly higher than NASA’s knockdown factor function; therefore, it is believed that the present knockdown factor function can facilitate in developing lightweight launch vehicle structures using isogrid-stiffened cylinders.
American Psychological Association (APA)
Kim, Han-Il& Sim, Chang-Hoon& Park, Jae-Sang& Lee, Keejoo& Yoo, Joon-Tae& Yoon, Young-Ha. 2020. Numerical Derivation of Buckling Knockdown Factors for Isogrid-Stiffened Cylinders with Various Shell Thickness Ratios. International Journal of Aerospace Engineering،Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1168644
Modern Language Association (MLA)
Kim, Han-Il…[et al.]. Numerical Derivation of Buckling Knockdown Factors for Isogrid-Stiffened Cylinders with Various Shell Thickness Ratios. International Journal of Aerospace Engineering No. 2020 (2020), pp.1-14.
https://search.emarefa.net/detail/BIM-1168644
American Medical Association (AMA)
Kim, Han-Il& Sim, Chang-Hoon& Park, Jae-Sang& Lee, Keejoo& Yoo, Joon-Tae& Yoon, Young-Ha. Numerical Derivation of Buckling Knockdown Factors for Isogrid-Stiffened Cylinders with Various Shell Thickness Ratios. International Journal of Aerospace Engineering. 2020. Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1168644
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1168644