Design of variable-stiffness composite panels for maximum buckling load

2009 ◽  
Vol 87 (1) ◽  
pp. 109-117 ◽  
Author(s):  
Shahriar Setoodeh ◽  
Mostafa M. Abdalla ◽  
Samuel T. IJsselmuiden ◽  
Zafer Gürdal
Keyword(s):  
Variable Stiffness ◽  
Buckling Load ◽  
Composite Panels

scholarly journals Buckling Optimization of Variable Stiffness Composite Panels for Curvilinear Fibers and Grid Stiffeners

2021 ◽  
Vol 5 (12) ◽  
pp. 324
Author(s):  
Sofía Arranz ◽  
Abdolrasoul Sohouli ◽  
Afzal Suleman
Keyword(s):  
Boundary Conditions ◽  
Fiber Orientation ◽  
Fiber Composite ◽  
Variable Stiffness ◽  
Buckling Load ◽  
Composite Panels ◽  
Spatial Direction ◽  
Percentage Difference ◽  
Stiffener Layout ◽  
Curvilinear Fibers

Automated Fiber Placement (AFP) machines can manufacture composite panels with curvilinear fibers. In this article, the critical buckling load of grid-stiffened curvilinear fiber composite panels is maximized using a genetic algorithm. The skin is composed of layers in which the fiber orientation varies along one spatial direction. The design variables are the fiber orientation of the panel for each layer and the stiffener layout. Manufacturing constraints in terms of maximum curvature allowable by the AFP machine are imposed for both skin and stiffener fibers. The effect of manufacturing-induced gaps in the laminates is also incorporated. The finite element method is used to perform the buckling analyses. The panels are subjected to in-plane compressive and shear loads under several boundary conditions. Optimization results show that the percentage difference in the buckling load between curvilinear and straight fiber panels depends on the load case and boundary conditions.

Design of Variable Stiffness Cylinder with Holes Under Bending for Maximum Buckling Load Using Lamination Parameters

2019 ◽  
Author(s):  
Mazen Albazzan ◽  
Brian Tatting ◽  
Ramy Harik ◽  
Zafer Gürdal ◽  
Adriana Blom-Schieber ◽  
...  
Keyword(s):  
Variable Stiffness ◽  
Buckling Load ◽  
Lamination Parameters

Thermomechanical Response of Variable Stiffness Composite Panels

2008 ◽  
Vol 32 (1-2) ◽  
pp. 187-208 ◽  
Author(s):  
M. M. Abdalla ◽  
Z. Gürdal ◽  
G. F. Abdelal
Keyword(s):  
Variable Stiffness ◽  
Composite Panels ◽  
Thermomechanical Response

Adaptive gradient-enhanced kriging model for variable-stiffness composite panels using Isogeometric analysis

2018 ◽  
Vol 58 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Peng Hao ◽  
Shaojun Feng ◽  
Ke Zhang ◽  
Zheng Li ◽  
Bo Wang ◽  
...  
Keyword(s):  
Isogeometric Analysis ◽  
Variable Stiffness ◽  
Kriging Model ◽  
Composite Panels

Optimization of Variable-Stiffness Panels for Maximum Buckling Load Using Lamination Parameters

AIAA Journal ◽  
2010 ◽  
Vol 48 (1) ◽  
pp. 134-143 ◽  
Author(s):  
Samuel T. IJsselmuiden ◽  
Mostafa M. Abdalla ◽  
Zafer Gurdal
Keyword(s):  
Variable Stiffness ◽  
Buckling Load ◽  
Lamination Parameters

Structural Analysis of Variable Stiffness Laminated Plates Using First-Order Shear Deformation Theory

2014 ◽  
Author(s):  
A. H. Akbarzadeh ◽  
M. Arian Nik ◽  
D. Pasini
Keyword(s):  
Transverse Shear ◽  
Deformation Theory ◽  
Shear Deformation Theory ◽  
Variable Stiffness ◽  
Buckling Load ◽  
Shear Stresses ◽  
Critical Buckling Load ◽  
First Order ◽  
Stiffness Design ◽  
Transverse Shear Stresses

Constant and variable stiffness strategies have been developed to design a composite laminate. With the former, each layer is designed with straight fibers that have the highest stiffness and strength in the fiber direction. With the latter, on the other hand, the stiffness can change within each layer by placing the fibers along a curvilinear fiber path. A variable stiffness design results in improved structural performance, as well as opens up opportunities to search for trade-off among structural properties. During the manufacture of a variable stiffness design with Automated Fiber Placement, certain defects in the form of gaps and overlaps could appear within the laminate and affect the laminate performance. In this study, we use the first-order shear deformation theory to assess the effect of transverse shear stresses on the critical buckling load, free and forced vibration of a variable stiffness laminate with embedded defects, an issue so far rarely examined in literature. The governing differential equations for the static analysis are first derived. A semi-analytic solution is then obtained using the hybrid Fourier-Galerkin method and the numeric time integration technique. The eigenvalue analysis is also conducted to determine the fundamental frequency and critical buckling load of the plate. It is found that the behavior of a variable stiffness plate is much more affected by the shear stresses than a constant stiffness plate. Ignoring the effect of transverse shear stresses results in 34% error in the predicted buckling load of a variable stiffness laminate with overlaps and a length-to-thickness ratio of 10.

Aeroelastic analysis of pre-stressed variable stiffness composite panels

2019 ◽  
Vol 26 (9-10) ◽  
pp. 724-734 ◽  
Author(s):  
Mehnaz Rasool ◽  
Maloy K Singha
Keyword(s):  
Dynamic Pressure ◽  
Variable Stiffness ◽  
Limit Cycle Oscillation ◽  
Composite Panels ◽  
Constant Stiffness ◽  
Aerodynamic Pressure ◽  
Aeroelastic Analysis ◽  
Divergence Type ◽  
Cycle Oscillation ◽  
The Stability

The effect of in-plane stresses on the stability behaviors of constant stiffness and variable stiffness composite panels, exposed to aerodynamic pressure, is studied using the finite element method. The dynamic pressure from the high velocity airflow is evaluated from the first-order piston theory, and the eigenvalue analysis is performed to investigate the flutter or divergence type of instabilities in such composite panels under combined mechanical and aerodynamic loads. Attempt is made to understand the effect of the lamination parameter on the stability characteristics of edge-supported and cantilever composite trapezoidal panels. Finally, the limit cycle oscillation of variable stiffness plates subjected to aerodynamic pressure is investigated.

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