A Study On Simulation Analysis Method Of Lightweight Bulkhead

Today, in the face of the human society’s appeal for energy saving and emissionreduction and the pressure for “Energy Efficient Design Index for new shipsdeveloped by International Maritime Organization, shipbuilding industry of the worldis hard at work to achieve low fuel consumption, low pollution and high energyefficiency of shipping. On the premise of guarantee the strength of ship, it’s a generalagreement in the international shipping industry that they can improve shippingefficiency by reducing ship weight and realizing lightweight of ship hull.Screen bulkhead is one of the widely used bulkhead structure types in thesuperstructure of ship and ocean engineering structures. It is used as partition dividingsuperstructure space into compartments and need to have certain stiffness. As alightweight composite material, honeycomb sandwich plate has large bendingstiffness, high strength, good stability, good sound insulation and heat insulationeffect, and so on. In this paper, the honeycomb sandwich plate is considered tosubstitute traditional screen bulkhead in order to reduce the structural weight of shiphull. However, up to now honeycomb sandwich plate is mainly used for special hullstructure and special hull configuration, and not yet widely used in the field ofshipbuilding. One of the main reasons for that might be the inadequate applicationresearch on honeycomb sandwich plate in actual projects. So it is necessary todetermine the reasonable and reliable static analysis method which can be used in inactual projects. Because of large numbers of meso structures in honeycomb core, it isunable to establish the3D finite element model of structure which is built byhoneycomb sandwich plates. Therefore, it’s necessary to carry out an equivalentsimulation method of honeycomb sandwich plate.In this thesis a research is performed on the equivalent simulation method ofhoneycomb sandwich plate by means of the good combination of theoretical study,model test and element simulation, and then the effect of reducing hull weight by using honeycomb sandwich plate to replace screen bulkhead is analyzed preliminarily.The main work is as follows:Firstly, formulas of equivalent mechanical parameters for the honeycomb corededuced by many scholars are compared and summarized to obtain the morereasonable formula. And then three current equivalent theories of honeycombsandwich plates are introduced. They are static equivalent, dynamic equivalent, andthe sandwich theories, which provide theoretical supports for comparison ofequivalent simulation methods.In order to verify the simulation effect of3D finite element model, the thesisdoes three-bending experiment of honeycomb sandwich plate specimens. Becausethe simulation result is close to the experimental result,3D finite element simulationmodel can be used as a standard to verify whether the effects of equivalent simulationmodels are accurate.Three equivalent theories of honeycomb sandwich plates can be used incombination with shell element in ANSYS. Taking simulation results of3D finiteelement models as a standard, the accuracies of three equivalent simulation methodsbased on three equivalent theories can be compared. And then the equivalentsimulation method based on sandwich theory is proven to be effectivecomprehensively.Simulation method is used to rudimentarily compare the mechanical property ofhoneycomb sandwich plate with the mechanical property of traditional screenbulkhead. The core-high and the face veneer thickness are adjusted to change thestrength and stiffness of honeycomb sandwich plate. The simulation results show that:the structural weight is effectively reduced if the honeycomb sandwich plate isdesigned with equivalent strength and stiffness to replace the screen bulkhead.