A co-directional bead method for lightweight design of sandwichbulkheads was presented to develop innovative bulkheads that are loadbearing,fire resistance and lightweight, and to replace the stiffenedbulkheads in designated regions of ships. Take the local ship modelincluding a stiffened bulkhead as an example, the structural quality ofsandwich bulkheads was selected as the objective function, and themaximum Von. Mises stresses in the weld zone and nonweld zone aswell as the first-order buckling factor of sandwich bulkheads were takenas constraints. The initial models of sandwich bulkheads wereestablished and solved using topography optimization. Then sandwichbulkheads which can be used for manufacturing were designed bysmooth design based on the initial design results obtained by topographyoptimization. Further modifications were conducted thereby the finalmodels of sandwich bulkheads were obtained. The mechanical propertiesand the structural weight were compared between the new sandwichbulkheads and the stiffened bulkhead. The results indicate that incompetition with the stiffened bulkhead, new sandwich bulkheads aremore lightweight design. While satisfying the strength requirements, theweight of the final promising design is reduced by 25.80%. Themaximum material performance utilization rate of the final promisingdesign is increased by 33.63%. This co-directional bead method hasimplemented the design for sandwich bulkheads, which can be used inthe designated regions of ships to design sandwich bulkheads that satisfythe performance requirements with a minimal weight loss.
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