scholarly journals SOME FEATURED OPTIMAL LAY-UP SOLUTIONS FOR COMPOSITE VAT PLATES UNDER BUCKLING, POSTBUCKLING AND LARGE-DEFLECTION POSTBUCKLING CONDITIONS

2021 ◽  
Author(s):  
Sergey Selyugin
Keyword(s):  
Optimality Conditions ◽  
Large Deflection ◽  
Von Karman ◽  
Von Kármán

The paper is devoted to some featured lay-up solutions for optimized composite VAT plates under such conditions as buckling, postbuckling (within the von Karman limits) or large-deflection postbuckling (beyond the von Karman limits). The corresponding optimality conditions are theoretically analyzed. The possible locally orthotropic solutions are identified and discussed.

scholarly journals LAY-UP OPTIMALITY CONDITIONS FOR BUCKLING LEVEL MAXIMIZATION OF VAT (STEERED FIBER) COMPOSITE PLATES

2019 ◽  
Author(s):  
Sergey Selyugin
Keyword(s):  
Comparative Analysis ◽  
Optimality Conditions ◽  
Physical Meaning ◽  
Variational Principles ◽  
Fiber Composite ◽  
Composite Plates ◽  
Single Mode ◽  
Lamination Parameters ◽  
Von Karman ◽  
Von Kármán

IIn the present paper the flat composite plates in buckling are studied. The plates have a symmetric lay-up and loaded along their contour by the in-plane forces. The consideration employs the von Karman approach. The lay-up optimality conditions for a single-mode (lowest) buckling eigenvalue are derived using the proper variational principles and the variation calculus. Both the bending terms and the terms following from the redistribution of the 2D stresses over the plate are taken into account. The optimality conditions contain two items (corresponding to the bending and to the 2D infinitesimal plane strains). The comparative analysis of the items is performed. The physical meaning of the optimality conditions is demonstrated and explained. An illustration to the derived conditions is presented and analyzed. It is shown that for the optimal lay-up not all lamination parameters are independent on each other (one of them is a linearly dependent one). The analysis leads to a conclusion that the optimization w.r.t. the lamination parameters only is not sufficient for obtaining an optimal plate lay-up.

Improved Analytical Modeling of Membrane Large Deflection With Lateral Force for the Underwater CMUT Based on Von Kármán Equations

2016 ◽  
Vol 16 (17) ◽  
pp. 6633-6640 ◽  
Author(s):  
Jiujiang Wang ◽  
Sio Hang Pun ◽  
Peng Un Mak ◽  
Ching-Hsiang Cheng ◽  
Yuanyu Yu ◽  
...  
Keyword(s):  
Analytical Modeling ◽  
Large Deflection ◽  
Lateral Force ◽  
Von Karman ◽  
Von Kármán Equations ◽  
Von Kármán
Sign in / Sign up

Export Citation Format

Share Document