Study on modal characteristics of perforated shell using effective Young's modulus

For the perforated cylindrical shell submerged in fluid, it is almost impossible to develop a finite element model due to the necessity of the fine meshing of the shell and the fluid at the same time. This necessitates the use of solid shell with effective material properties. Unfortunately the effective elastic constants are not found in any references even though the ASME code is suggesting those for perforated plate. Therefore in this study the effective material properties of perforated shell are suggested by performing several finite element analyses with respect to the ligament efficiencies.

Research highlights
► The effective Young's modulus of perforated shell is proposed for modal analysis.
► The penetration pattern is almost negligible for effective elastic constants.
► The frequency of perforated shell decreases significantly due to the hole effect.