Nonlinear Dynamic Response Of Stiffened Plate Under Impact Load

The impact of impact load on the dynamic response of marine stiffened plates is a hot issue in recent years.Ships sailing in the ocean will encounter various complex and dangerous sea conditions;as the basic component of the hull structure,it is very important to study the dynamic response of the stiffened plate.The stiffened plate structure itself has many advantages.Many scholars began to study the stiffened plate a long time ago,but the stiffened plate structure contains many influencing parameters,and the impact load has many influencing factors.Therefore,the impact load is analyzed The effect on the stiffened plate is very complicated.This article is based on previous studies,through the establishment of an appropriate stiffened plate model,using numerical analysis methods to study the dynamic response of the stiffened plate structure under the impact load.The main research content and results of the paper are as follows:(1)Analyze the mechanism of impact load and simplify the actual impact load reasonably.The simplified impact load types analyzed in the thesis are fluid-solid impact load,triangle load,step load and linear attenuation load;the dynamic response process of the stiffened plate structure under four simplified impact loads is studied.(2)Carry out research and analysis on the marine stiffened plate model and parameters,refer to the relevant specifications and literature,select the appropriate stiffened plate model and parameters;write a finite element program,and compare the simulation results with the relevant literature to verify the correctness and feasibility of the paper program.(3)The finite element software ANSYS was used for modeling and analysis to study the impact of parameters such as impact load parameters,stiffened plate parameters and initial defects on the response process of the stiffened plate structure.(4)The central difference method is used to analyze the main influencing factors from qualitative to quantitative.A more comprehensive and systematic analysis of the specific influence of the stiffened plate parameters on its dynamic response process is made,and the analysis results are summarized.(5)Study the deformation mode of the stiffened plate under the impact load.The stiffened plate will have different deformation modes under the impact load,including the overall deformation mode,the local deformation m ode and the mixed deformation mode with both the overall deformation and the local deformation.An important aspect of the thesis is to analyze the impact time of impact load,peak load and the relative stiffness of the stiffened plate structure on its def ormation mode.Through reasonable modeling,a large number of numerical calculations and analysis comparisons,the results and conclusions obtained are more reasonable and can be applied to engineering practice.