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http://dx.doi.org/10.1016/j.net.2015.01.012

FREE VIBRATION ANALYSIS OF PERFORATED PLATE WITH SQUARE PENETRATION PATTERN USING EQUIVALENT MATERIAL PROPERTIES  

JHUNG, MYUNG JO (Korea Institute of Nuclear Safety)
JEONG, KYEONG HOON (Korea Atomic Energy Research Institute)
Publication Information
Nuclear Engineering and Technology / v.47, no.4, 2015 , pp. 500-511 More about this Journal
Abstract
In this study, the natural frequencies of the perforated square plate with a square penetration pattern are obtained as a function of ligament efficiency using the commercial finite-element analysis code ANSYS. In addition, they are used to extract the effective modulus of elasticity under an assumption of a constant Poisson's ratio. The effective modulus of elasticity of the fully perforated square plate is applied to the modal analysis of a partially perforated square plate using a homogeneous finite-element analysis model. The natural frequencies and the corresponding mode shapes of the homogeneous model are compared with the results of the detailed finite-element analysis model of the partially perforated square plate to check the validity of the effective modulus of elasticity. In addition, the theoretical method to calculate the natural frequencies of a partially perforated square plate with fixed edges is suggested according to the Rayleigh-Ritz method.
Keywords
Effective modulus of elasticity; Finite-element analysis; Ligament efficiency; Natural frequency; Perforated plate; Rayleigh-Ritz method; Square plate;
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