Rational reinforcement of laminated composite cylindrical panels with regard to stability constraints

1994 ◽  
Vol 29 (6) ◽  
pp. 587-595
Author(s):  
A. Riekstiņš ◽  
G. A. Teters
Keyword(s):  
Laminated Composite ◽  
Rational Reinforcement ◽  
Cylindrical Panels

scholarly journals FREE VIBRATION ANALYSIS OF LAMINATED STIFFENED CYLINDRICAL PANELS USING FINITE ELEMENT METHOD

2016 ◽  
Vol 54 (6) ◽  
pp. 771
Author(s):  
Trinh Anh Tuan ◽  
Tran Huu Quoc ◽  
Tran Minh Tu
Keyword(s):  
Free Vibration ◽  
Vibration Analysis ◽  
Laminated Composite ◽  
Free Vibration Analysis ◽  
Shell Element ◽  
Cylindrical Panels ◽  
Parametric Studies ◽  
Shell Panel ◽  
Degenerated Shell Element ◽  
Good Agreement

A study on the free vibration analysis of stiffened laminated composite cylindrical shell is described in this paper. The eight-noded isoparametric degenerated shell element is developed to model both shell panel and stiffeners by using the degenerated solid concept based on Reissner-Mindlin assumptions which taking to account the shear deformation and rotatory effect. Numerical results are presented and comparison is made with the published results from the literature and the good agreement is found. Parametric studies considering different geometrical variables of shell and stiffeners have also been carried out.

PARAMETRIC INSTABILITY OF LAMINATED COMPOSITE CYLINDRICAL PANELS SUBJECTED TO PERIODIC NON-UNIFORM IN-PLANE LOADS

2011 ◽  
Vol 03 (04) ◽  
pp. 845-865 ◽  
Author(s):  
SARAT KUMAR PANDA ◽  
L. S. RAMACHANDRA
Keyword(s):  
Differential Equations ◽  
Dynamic Instability ◽  
Elastic Shell ◽  
Parametric Instability ◽  
Shear Deformation Theory ◽  
Mathieu Equation ◽  
Laminated Composite ◽  
Stress Distributions ◽  
Cylindrical Panels ◽  
Instability Regions

In the present investigation, the dynamic instability regions of shear deformable cross-ply laminated and composite cylindrical panels subjected to periodic nonuniform in-plane loads are reported. Since the applied in-plane load is nonuniform, initially the static part of the nonuniform in-plane loads are applied and the stresses (σx, σy and τxy) within the panel are evaluated by the solution of cylindrical panel membrane problem. Subsequently, superposing the stress distribution due to static and dynamic in-plane loads, the stress distributions within the panel are obtained. Using these stress distributions the governing equations of the problem are derived through Hamilton's variational principle based on higher-order shear deformation theory of elastic shell theory incorporating von Kármán-type nonlinear strain displacement relations. The governing partial differential equations are reduced into a set of ordinary differential equations (Mathieu-type of equations) by employing Galerkin's method. The instability boundaries of Mathieu equation corresponding to periodic solutions of period T and 2T are determined using Fourier series. Effect of various parameters like static and dynamic load factors, aspect ratio, thickness-to-radius ratio, shallowness ratio, linearly varying in-plane load, parabolic in-plane load and various boundary conditions on the instability regions are investigated.

Modal analysis of cylindrical panels at elevated temperatures under nonuniform heating conditions: Experimental investigation

2020 ◽  
pp. 095440622093673
Author(s):  
CM Twinkle ◽  
C Nithun ◽  
Jeyaraj Pitchaimani ◽  
Vasudevan Rajamohan
Keyword(s):  
Free Vibration ◽  
Elevated Temperatures ◽  
Laminated Composite ◽  
Free Vibration Analysis ◽  
Cylindrical Panel ◽  
Experimental Results ◽  
Mode Shapes ◽  
Experimental Investigations ◽  
Nonuniform Heating ◽  
Cylindrical Panels

In this study, experimental investigations carried out to analyze the influences of different in-plane temperature variations on buckling and free vibration responses of metal and fiber-reinforced laminated composite cylindrical panels are presented. Initially, critical buckling temperature is calculated then free vibration analysis is performed as a function of the buckling temperature to analyze the changes in the natural frequencies and mode shapes. Experimental results revealed that the thermal buckling strength of the panel is significantly influenced by the nature of the heating condition. Similarly, significant changes in free vibration mode shapes are observed with the rise in temperature and also according to the heating conditions. It is also observed that, with the increase in temperature, nodal and anti-nodal lines of free vibration modes shifting towards the heating source. The experimental results are compared with the numerical simulation for the studies on the isotropic cylindrical panel and both the results are in good agreement.

scholarly journals Post-Buckling Behaviour of laminated Cylindrical Panels with/without Cut-Outs

2019 ◽  
Vol 8 (3) ◽  
pp. 8026-8030
Keyword(s):  
Compressive Load ◽  
Laminated Composite ◽  
Cylindrical Panel ◽  
Buckling Load ◽  
Equilibrium Path ◽  
Cylindrical Panels ◽  
Post Buckling ◽  
The Impact ◽  
Generalized Finite Element ◽  
Composite Cylindrical Panel

Buckling and post-buckling analysis of isotropic and laminated composite cylindrical plates/panels under compressive load has been done by equilibrium path approach (arc-length technique). The impact of cut outs on buckling and post-buckling load of an isotropic and laminated composite cylindrical plates/panels has been assessed by utilizing summed up generalized finite element programming ANSYS. In post-buckling Eigen mode imperfection shape is picked for creating geometric undulations on cylindrical panels with/without circular cut-outs. The impact of the area and size of the cut out and furthermore the composite utilize point on the buckling load of laminated composite cylindrical panel is explored with simply supported boundary conditions. The post-buckling consequences of laminated cylindrical panels have been validated with existing appropriate writing (18) and are additionally stretched out for analysis of sheets/plates with cutouts. It has been seen that the as the curvature of the panel increases load bearing capacity is increasing irrespective of the material and with/without cut out.

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