The Dynamic Plastic Response Of Rectangular Stiffened Panel Under Shock Load

When the ship structure is subjected to shock load or collision,the dynamic response of ship structures mostly are investigated by using numerical simulation or model test.So far,the explanation on the dynamic response of ship's stiffened panel by theoretical method is not distinct.In order to quickly and accurately predict the deformation and dynamic response of ship's stiffened panel when it subjected to the shock load,it is necessary to study the plastic damage characteristic of rectangle stiffened panel by applying the theoretical method.This article main content is as follows:Theoretical models of rectangular plate,cross-stiffened and double cross-stiffened rectangular panel are modeled in this paper,and the deformation functions of the stiffened panel under shock load are derived.In addition,the relationship between time history of plastic deformation should be proposed.In order to simplify the calculation and convenience for theoretical derivation,the theoretical model are assumed as follows:(1)Material is assumed as the perfectly rigid-plastic material;(2)The bending moment and shear force between the stiffener and the plate are ignored;(3)The overall damage mode of stiffened panel under shock load is same as that under ultimate static load.The theoretical calculations in term of the plastic response of stiffened panel are performed in analytical and energy method,respectively,and the results are compared with those by numerical calculation.The conclusion can be summarized as follows:(1)The theoretical calculation formula for the shock response of the rectangular plate,cross-stiffened and double cross-stiffened rectangular panels are derived;(2)The calculation results from theoretical and finite element method have a good agreement,which validated the validity of the theoretical calculation method.So the deformation of stiffened panel under shock load can quickly be predicted.It is also beneficial to analyze the influence of different parameters on the plastic damage characteristics of stiffened panel,which have a good reference value to the safety design of ship structures.