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Structural Engineering and Mechanics
  Volume 55, Number 3, August10 2015, pages 583-603

Modal characteristics of partially perforated rectangular plate with triangular penetration pattern
Myung J. Jhung and Kyeong H. Jeong

    There are so many applications of perforated pates with various penetration patterns. If they are penetrated regularly, it can be represented by solid plate with equivalent material properties, which has a benefit of finite element modelling and reducing computation time for the analysis. Because the equivalent material properties suggested already are not proper to be applicable for the dynamic analysis, it is necessary to extract the equivalent material properties for the dynamic analysis. Therefore, in this study, the equivalent modulus of elasticity are obtained for the perforated plate with a triangular penetration pattern by comparing the natural frequencies of the perforated plate with those of solid plate, which are represented with respect to the ligament efficacy. Using the equivalent material properties suggested, the modal analyses of the partially perforated rectangular plate with a triangular penetration pattern are performed and its applicability is shown by comparing natural frequencies of perforated and homogeneous solid plates from finite element method and analytical method.
Key Words
    partially perforated plate; rectangular plate; effective modulus of elasticity; finite element analysis; Rayleigh-Ritz method; ligament efficiency
Myung J. Jhung: Korea Institute of Nuclear Safety, Yuseong-gu, Daejeon, 305-338, Republic of Korea
Kyeong H. Jeong: Korea Atomic Energy Research Institute, Yuseong-gu, Daejeon, 305-353, Republic of Korea

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