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

Kim, Han-Il; Sim, Chang-Hoon; Park, Jae-Sang; Kim, Doyoung; Yoo, Joon-Tae; Yoon, Young-Ha; Lee, Keejoo

doi:10.5139/jksas.2020.48.9.653

Cited by 2 publications

(4 citation statements)

References 7 publications

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“…The enforced axial displacement is applied to the control nodes located at the center of the top and bottom surfaces of the cylinder. The control nodes are connected rigidly to the edge of the thin-walled composite cylinder (Figure 3); therefore, the applied displacement is transmitted to the edge of the cylinder with a uniform magnitude [26]. Furthermore, artificial damping of 5% is applied for numerical stabilization to dissipate the released strain energy using an artificial velocity for each node in the nonlinear static analysis when local instabilities occur [26][27][28][29][30].…”

Section: Modeling Techniques For Compressive Force and Internal Pressurementioning

confidence: 99%

“…The control nodes are connected rigidly to the edge of the thin-walled composite cylinder (Figure 3); therefore, the applied displacement is transmitted to the edge of the cylinder with a uniform magnitude [26]. Furthermore, artificial damping of 5% is applied for numerical stabilization to dissipate the released strain energy using an artificial velocity for each node in the nonlinear static analysis when local instabilities occur [26][27][28][29][30]. The internal pressure on the curved side surfaces of a cylinder is represented by distributed pressure loads.…”

Section: Modeling Techniques For Compressive Force and Internal Pressurementioning

confidence: 99%

“…In addition, since the geometric initial imperfection of a thin-walled shell structure is independent of loading conditions, the SPLA is enough to study the trend of the amount of increment in the buckling knockdown factors due to internal pressure when the geometric initial imperfection only is considered. The procedures of nonlinear post-buckling analysis using the SPLA [26][27][28][29][30] used in this study are as follows.…”

Section: Initial Imperfection Modeling and Post-buckling Analysismentioning

confidence: 99%

“…Therefore, the knockdown factor can be increased when the internal pressure is additionally considered for its derivation. Although the effect of internal pressure on the knockdown factor of an orthogrid-stiffened metallic cylinder [25] and an isogrid-stiffened cylinder [26] was investigated, not much research has been conducted on the thin-walled composite cylinders as mentioned above. The amount of increase in buckling knockdown factors due to the internal pressure may vary depending on the magnitude of internal pressure, but it is necessary to qualitatively and quantitatively verify how much buckling knockdown factors of thin-walled composite cylinders can be increased when the internal pressure is considered with the axial compressive force.…”

Section: Introductionmentioning

confidence: 99%

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Buckling Knockdown Factors of Composite Cylinders under Both Compression and Internal Pressure

et al. 2021

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The internal pressure of a thin-walled cylindrical structure under axial compression may improve the buckling stability by relieving loads and reducing initial imperfections. In this study, the effect of internal pressure on the buckling knockdown factor is investigated for axially compressed thin-walled composite cylinders with different shell thickness ratios and slenderness ratios. Various shell thickness ratios and slenderness ratios are considered when the buckling knockdown factor is derived for the thin-walled composite cylinders under both axial compression and internal pressure. Nonlinear post-buckling analyses are conducted using the nonlinear finite element analysis program, ABAQUS. The single perturbation load approach is used to represent the geometric initial imperfection of thin-walled composite cylinders. For cases with the axial compressive force only, the buckling knockdown factor decreases as the shell thickness ratio increases or as the slenderness ratio increases. When the internal pressure is considered simultaneously with the axial compressive force, the buckling knockdown factor decreases as the slenderness ratio increases but increases as the shell thickness ratio increases. The buckling knockdown factors considering the internal pressure and axial compressions are higher by 2.67% to 38.98% compared with the knockdown factors considering the axial compressive force only. The results show the significant effect of the internal pressure, particularly for thinner composite cylinders, and that the buckling knockdown factors may be enhanced for all the shell thickness ratios and slenderness ratios considered in this study when the internal pressure is applied to the cylinder.

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Section: Modeling Techniques For Compressive Force and Internal Pressurementioning

confidence: 99%

Section: Modeling Techniques For Compressive Force and Internal Pressurementioning

confidence: 99%

Section: Initial Imperfection Modeling and Post-buckling Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Buckling Knockdown Factors of Composite Cylinders under Both Compression and Internal Pressure

et al. 2021

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Study on Deriving the Buckling Knockdown Factor of a Common Bulkhead Propellant Tank

Lee¹,

Son²,

Choi³

et al. 2022

KSPE

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

Cited by 2 publications

References 7 publications

Buckling Knockdown Factors of Composite Cylinders under Both Compression and Internal Pressure

Buckling Knockdown Factors of Composite Cylinders under Both Compression and Internal Pressure

Study on Deriving the Buckling Knockdown Factor of a Common Bulkhead Propellant Tank

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