Investigation of Gap and Overlap Effects on the Buckling Load of Variable-Stiffness Composite Cylinders Under an External Hydrostatic Pressure and Pure Bending

Nopour, H.; Ataabadi, Abdulreza Kabiri; Shokrieh, M. M.

doi:10.1007/s11029-023-10085-y

Cited by 3 publications

(1 citation statement)

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“…Stability problem is also an important aspect of CCS. Nopour et al 10 used the genetic algorithm written in Python language to optimize the optimal path and direction of Abaqus curved fiber and straight fiber. Ansari et al 11 studied the compression buckling of cylindrical shells under the coupling action of bending/torsion.…”

Section: Introductionmentioning

confidence: 99%

Research progress of composite cylindrical shells

Zhang,

Zhao,

Pan

et al. 2023

Polymer Composites

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Composite cylindrical shell (CCS) structure are a number of engineering applications in aerospace, civil engineering, ordnance industry, sports equipment and other fields because of their excellent mechanical properties, low density and strong design. In this study, the classification, preparation technology and mechanical test of CCS are summarized. The research on the axial compression strength of CCS is reviewed. The theory of axial compression elasticity and the strength criterion of orthotropic composite materials are analyzed, and the strength criterion is compared. Finally, the basic theory of instability and buckling is deeply analyzed, and the stability theory of CCS is analyzed in detail. In order to provide a new reference for future scientific research and engineering application, the research difficulties are given in the conclusion, and the future research direction is predicted.Highlights Comparing and analyzing the classification, preparation technology and mechanical properties of composite cylindrical shells (CCS) comprehensively. Summarizing and analyzing the axial compression strength of CCS in depth, and analyzing the theory of axial compression elasticity and the strength criterion of orthotropic composite materials thoroughly. Analyzing the basic theory of instability and buckling in depth, and analyzing the stability theory of CCS in detail. Giving the research difficulty of composite cylindrical shell, and predicting the future development direction of CCS.

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Section: Introductionmentioning

confidence: 99%

Research progress of composite cylindrical shells

Zhang,

Zhao,

Pan

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

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Compressive buckling of variable stiffness laminated beams with delamination defects

Niu,

Song,

Zhang

2024

Polymer Composites

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Fiber reinforced polymer (FRP) structures in practical applications inevitably contain some micro‐defects, which are susceptible to result in the degradation of the mechanical properties, and even lead to structural instability. A series of variable stiffness (VS) specimens are prepared and applied to 4‐point bending (4P‐bending) experiments and uniaxial compressive (UC‐buckling) experiments to investigate the influence of curvilinear paths of towpregs on the buckling performance of laminated beams. By calculating the equivalent flexural stiffness (EFS) analysis of VS laminated beams, an analytical method is proposed to study the effects of the design parameters on the bending and buckling performances of laminated beams with or without delamination. A variable, the loss rate of the stiffness, is introduced and formulated to quantitatively analyze the degradation process of each VS specimen in terms of flexural stiffness. With buckling shape images obtained from UC‐buckling tests, the changes from unilateral buckling to bilateral buckling that occurred on VS specimens were captured and compared. The results show that the advantages of VS design on improving the damage tolerance capability of laminated structures. Compared with the traditional constant stiffness (CS) specimens, the specially designed VS specimens have increased their bending stiffness and structural stability by 21.8% and 24.36%, respectively.Highlights A method is proposed to analyze the flexural stiffness distribution. The concept of equivalent flexural stiffness is introduced and formulated. The evolution of buckling behaviors occurred on VS beams are characterized. Most VS specimens have a better tolerance to delamination damages.

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