Investigation On Strength Analysis Method For SPS Ship Structures

As a new advanced material used in naval architecture and ocean engineering, Sandwich Plate System (SPS) receives an extensive attention. At present, there is no applicable rule for the design and strength assessment of SPS structures in naval architecture. Based on this point, the following are studied in this paper:1. The bending and bulking performance of SPS structure were investigated based on Hoff theory. At the same time, the results were compared with the ones based on Reissner theory.2. Equivalent analysis methods of a rectangular SPS plate were performed and mechanics models were established based on the different equivalence principles. The applied scopes of different equivalence mechanics were analyzed and the results of different equivalence mechanics models were compared with the analytical solution according to Hoff theory.3. A new numerical simulation method was proposed based on the principle of stiffness decomposition. The numerical result was obtained by addition of the results calculated by the finite element analysis and the results calculated by a computation code.4. A rectangular SPS plate and a double bottom were taken as the numerical examples. The results calculated by the numerical simulation method given in the paper are compared with the ones calculated by solid elements, the mixture of shell and solid elements, and then a reasonable method of finite element modeling was analyzed.5. Failure modes of SPS structure were investigated and the method of the strength assessments for SPS structure was presented. The yielding and buckling strength of a refitting Panamax oil tanker and a 14K DWT double hulled product oil tanker were carried out as examples.