PARAMETRIC INSTABILITY OF DOUBLY CURVED PANELS SUBJECTED TO NON-UNIFORM HARMONIC LOADING

2001 ◽  
Vol 240 (1) ◽  
pp. 117-129 ◽  
Author(s):  
S.K. SAHU ◽  
P.K. DATTA
Keyword(s):  
Parametric Instability ◽  
Harmonic Loading ◽  
Doubly Curved ◽  
Curved Panels

Sensitivity of the response of thick cross-ply doubly curved panels to edge clamping

2009 ◽  
Vol 87 (4) ◽  
pp. 293-306 ◽  
Author(s):  
Ahmet Sinan Oktem ◽  
Reaz A. Chaudhuri
Keyword(s):  
Doubly Curved ◽  
Curved Panels

Parametric Resonance Characteristics of Woven Fiber Metal Laminated Plates

2019 ◽  
Vol 11 (04) ◽  
pp. 1950034 ◽  
Author(s):  
Elluri Venkata Prasad ◽  
Shishir Kumar Sahu
Keyword(s):  
Parametric Resonance ◽  
Degrees Of Freedom ◽  
Dynamic Instability ◽  
Parametric Instability ◽  
Laminated Plates ◽  
Load Factor ◽  
Harmonic Loading ◽  
Resonance Behavior ◽  
Fiber Metal ◽  
Ply Orientation

The present investigation deals with the assessment of parametric resonance behavior of new aircraft material, i.e., woven fiber metal laminated (FML) plates subjected to in-plane static and harmonic loading using finite element (FE) technique and Bolotin’s method. In this analysis, a four-node isoparametric element with five degrees of freedom per node is adopted. Based on the first-order Reissner–Mindlin theory, the parametric instability of FML plate subjected to in-plane harmonic loading is examined. A MATLAB code is developed for the parametric study on the dynamic stability of FML plates. The reliability of present formulation is checked by comparing numerical results obtained from present FE analysis with the published researches in the field. The influences of several factors, viz. static load factor, aspect ratio, length-to-thickness ratio, number of layers, ply orientation and boundary conditions on the dynamic instability regions are discussed. Significant variations of these factors on dynamic instability zones of FML plates are observed. The instability zones can be used as guidelines for the prediction of the dynamic behavior of FML plates.

Fourier analysis of thick cross-ply Levy type clamped doubly-curved panels

2007 ◽  
Vol 80 (4) ◽  
pp. 489-503 ◽  
Author(s):  
Ahmet Sinan Oktem ◽  
Reaz A. Chaudhuri
Keyword(s):  
Fourier Analysis ◽  
Doubly Curved ◽  
Curved Panels

Double orthogonal set of solution functions for cross-ply laminated shear flexible cylindrical/doubly curved panels

2003 ◽  
Vol 59 (2) ◽  
pp. 189-198
Author(s):  
Humayun R.H. Kabir ◽  
Abdullateef M. Al-Khaleefi ◽  
Mai Al-Marzouk
Keyword(s):  
Doubly Curved ◽  
Curved Panels ◽  
Orthogonal Set

Static and dynamic instability characteristics of curved laminates with internal damage subjected to follower loading

2011 ◽  
Vol 225 (7) ◽  
pp. 1589-1600 ◽  
Author(s):  
S Biswas ◽  
P K Datta ◽  
C D Kong
Keyword(s):  
Dynamic Instability ◽  
Shear Deformation Theory ◽  
Internal Damage ◽  
First Order ◽  
Static And Dynamic Instability ◽  
Element Approach ◽  
Formulation Analysis ◽  
Flutter Load ◽  
Doubly Curved ◽  
Curved Panels

This article deals with the study of vibration, buckling, and dynamic instability characteristics in damaged cross-ply and angle-ply curved laminates under uniform, uniaxial follower loading, using finite element approach. First-order shear deformation theory is used to model the doubly curved panels and is formulated according to Sandars' first approximation. Damage is modelled using an anisotropic damage formulation. Analysis is carried out on plate and three types of curved panels to obtain vibration, buckling, and dynamic instability (flutter) behaviour. The effect of damage on natural frequency, critical buckling load, flutter load, and flutter frequency is studied. The results show that the introduction of damage influences the flutter characteristics of panels more profoundly than the free-vibration or buckling characteristics. The results also indicate that, compared to undamaged panels, heavily damaged panels show steeper deviations in stability characteristics than mildly damaged ones.

PARAMETRIC COMBINATION RESONANCE CHARACTERISTICS OF DOUBLY CURVED PANELS SUBJECTED TO NON-UNIFORM HARMONIC EDGE LOADING

2005 ◽  
Vol 05 (04) ◽  
pp. 615-639 ◽  
Author(s):  
RATNAKAR S. UDAR ◽  
P. K. DATTA
Keyword(s):  
Shear Deformation ◽  
Dynamic Instability ◽  
Excitation Frequency ◽  
Instability Region ◽  
Load Factor ◽  
Combination Resonance ◽  
Edge Loading ◽  
Instability Regions ◽  
Doubly Curved ◽  
Curved Panels

This paper is concerned with the problem of occurrence of combination resonances in parametrically excited doubly curved panels. The dynamic instability of doubly curved panels, subjected to non-uniform in-plane harmonic loading is investigated. Sander's first-order shear deformation theory is used to model the doubly curved panels, considering the effects of transverse shear deformation and rotary inertia. The theory can be reduced to Love's and Donnell's theories by means of tracers. Analytical expressions for the instability regions are obtained at Ω = ωm+ ωn(Ω is the excitation frequency and ωmand ωnare the natural frequencies of the system), by using the method of multiple scales. It is shown that besides the principal instability region at Ω =2ω1, where ω1is the fundamental frequency, other cases of Ω = ωm+ ωnwhich are related to other modes, can be of major importance and yield a significantly enlarged instability region. The results show that under localized edge loading, combination resonance zones are as important as simple resonance zones. The effects of edge loading, curvature, shallowness ratio, edge length to thickness ratio, aspect ratio, boundary conditions and the static load factor on dynamic instability regions are considered.

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