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Equivalent Material Properties of Thin and Thick Perforated Plate by FEM simulation
Collins Owino JUMA,Ihn NAMGUNG 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Perforated plates are used for the steam generator tube sheet and the Reactor Vessel Closure Head in the Nuclear Power Plant. The structural integrity of these perforated structures is vital to the operation and safety of the Nuclear Power plant. ASME code addresses the analysis of perforated plates in Section III, Appendix A-8000, with triangular perforation pattern. This paper investigates the equivalent material properties by FEM methodology. Simulation of both thin and thick perforated plates and try to re-assess ASME Section III Appendix A-8000 curve. The isotropic material properties of the perforated plate were replaced with anisotropic material properties of the equivalent solid plate and subjected to same loading and boundary conditions. The difference between the deformation of the perforated and equivalent solid plate was optimized for convergence by varying the effective elastic constants. Curves of the effective elastic constants vs ligament efficiency were generated. The equivalent material property curves obtained using FEM methodology were in good agreement with the design curve provided in ASME Section. III Appendix A-8000.
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Assessment of Equivalent Elastic Modulus of Perforated Spherical Plates
collins juma,남궁인 한국압력기기공학회 2019 한국압력기기공학회 논문집 Vol.15 No.1
Perforated plates are used for the steam generator tube-sheet and the Reactor Vessel Closure Head in the Nuclear Power Plant. The ASME code, Section III Appendix A-8000, addresses the analysis of perforated plates, however, this analysis is only limited to the flat plate with a triangular perforation pattern. Based on the concept of the effective elastic constants, simulation of flat and spherical perforated plates and their equivalent solid plates were carried out using Finite Element Analysis (FEA). The isotropic material properties of the perforated plate were replaced with anisotropic material properties of the equivalent solid plate and subjected to the same loading conditions. The generated curves of effective elastic constants vs ligament efficiency for the flat perforated plate were in agreement with the design curve provided by ASME code. With this result, a plate with spherical curvature having perforations can be conveniently analyzed with equivalent elastic modulus and equivalent Poisson’s ratio.
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