Optimal design of variable stiffness laminated composite truncated cones under lateral external pressure

The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders

“…Using the same shell theory, Cagdas [15] has developed a curved axi-symmetric shell element, which is modified here for free vibration analysis, and Cagdas and Adali [16] have investigated the influence of pressure stiffness on the stability of cross-ply laminated moderately thick cylinders under hydrostatic pressure. In more recent studies, Cagdas [17,18] has modified the same element for the stability and stress analysis of filament wound cones. This study is the first application of this moderately thick shell finite element to composite cylinder vibration problems including compressive loads.…”

The Influence of Pressure Stiffness on the Torsional Buckling of Laminated Composite Cylinders Under External Hydrostatic Pressure

“…In more recent studies, Cagdas and Adali (2011) have shown that due to pressure stiffness, a reduction of up to 30% in buckling pressure is possible for cross-ply laminated cylinders under hydrostatic pressure. The influence of PS has recently been considered for filament wound cones by Cagdas (2017), for cylindrical panels by Smitha and Nandakumar (2018), for thick laminated composite shells by Khayat et al (2016), and for functionally graded shells under external pressure by Khayat et al (2017). In a more recent study, Basaglia et al (2019) have considered PS for pipes under hydrostatic pressure and have stated that the buckling pressure will be overestimated if PS is not taken into account.…”

“…A degenerated composite shell element based on the shell element developed by Kant (1992) is used to conduct the related structural analyses. This same element was used by Cagdas andAdali (2012a, 2012b) for linearized stability analysis and design optimization of composite shell structures. This element was recently modified by Cagdas (2017) for stability analysis considering PS.…”

“…This same element was used by Cagdas andAdali (2012a, 2012b) for linearized stability analysis and design optimization of composite shell structures. This element was recently modified by Cagdas (2017) for stability analysis considering PS. Similar shell finite elements were used by Ram and Babu (2002), and Barbosa and Ferreira (2009), Bakshi and Chakravorty (2014).…”