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Vibration of Stiffened Plates with Cutout Subjected to Partial Edge Loading

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Abstract

The buckling and vibration characteristics of stiffened plates with cutout subjected to in-plane partial edge loadings at the plate boundary are studied using finite element method. Buckling loads and vibration frequencies are determined for different plate and cutout aspect ratios, various boundary conditions, partial edge loading at different locations, cutout ratios, various parameters of stiffeners by varying the number, size and location of the stiffeners. The analysis presented determines the stresses all over the region for different kinds of loading and edge conditions. In the structural modelling, the plate and the stiffeners are treated as separate elements where the compatibility between these two types of elements is maintained. The buckling and vibration characteristics are discussed and the free vibration results available in the literature for stiffened plates with/without cutout are compared.

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Abbreviations

a:

Plate dimension in longitudinal direction

b:

Plate dimension in the transverse direction

c:

Width extent of partial edge loading at the boundary

t:

Plate thickness

E, G:

Young’s and shear moduli for the plate material

b s , d s :

Web thickness and depth of a x-stiffener

A s :

Cross-sectional area of the stiffener

I s :

Second moment of area of the stiffener cross-section about reference axis

[D P ]:

Rigidity matrix of plate

[D S ]:

Rigidity matrix of stiffener

[K e ], [K S ]:

Stiffness matrix of plate, stiffness matrix of stiffener

[M p ], [M S ]:

Consistent mass matrix of plate, stiffener

[K G ]:

Geometric stiffness matrix

[N] r :

Matrix of a shape function of a node r

P cr :

Critical buckling load

g, d:

Cutout length, cutout width

g/d:

Cutout width ratio

T S , P S :

Torsional constant, polar moment of inertia of the stiffener element

ω, λ:

Frequency parameter, buckling parameter

D:

Plate flexural rigidity

ρ:

Density of the plate material

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Srivastava, A.K.L. Vibration of Stiffened Plates with Cutout Subjected to Partial Edge Loading. J. Inst. Eng. India Ser. A 93, 129–135 (2012). https://doi.org/10.1007/s40030-012-0018-3

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