Research On Collision Response And Damege Of Double-side-side Composite Ship

Composite materials(Fiber Reinforced Plastics)are gradually occupying an important position in the field of ship and marine structure manufacturing due to their superior fatigue resistance,corrosion resistance,and resistance to adhesion,and have extremely high application value in both military and civilian applications.my country’s research and development in this field is relatively slow,often limited by the size of the hull structure and manufacturing technology.At present,the research on the collision of composite hulls is still in the traditional single side structure or the flat and curved panel structure in local areas.In order to improve the anti-collision performance and safety of composite materials ships,a new type of double-side skin FPR ship was designed with reference to the double-side skin steel structure ship,and the response characteristics and damage forms of its local area and overall structure under different collision conditions were studied.From the perspective of material layup design and the setting of filling materials in the cavity of the reinforcing rib frame,a relatively complete improvement measure is put forward for its anti-collision performance,so as to reduce the deformation and damage of the FRP hull as much as possible.Firstly,the low-velocity impact response and damage propagation of FRP cavity panels and foam aluminum sandwich panels are studied for the local structure of the double-side-side hull.Considering the influence of structural size,impact mass,thickness of foam aluminum sandwich layer and other variables on the impact calculation results,the response characteristics of the two structures,such as lowspeed impact force and energy change,and the response characteristics of the upper and lower skin panels of the structure are obtained.Damage status,including quantitative and qualitative analysis results and expanded forms of different types of damage.After completing the analysis of the local area,the superiority of the anticollision performance of the double-side FRP hull,and its collision response under various parameters such as collision speed,collision bow shape and collision angle are studied.damage characteristics.By comparative analysis,the response results such as the impact deformation degree,impact force change trend,and impact velocity change rate of the double-side-side hull are obtained,as well as the damage characteristics of fibers and matrix in the FRP layer of the hull,expansion form and other damage characteristics.The influence of the bonding failure between the twoway hat-shaped stiffener and the panel on the collision characteristics of the hull is also considered,which increases the amount of frictional dissipation energy during the collision process,which mainly affects the tensile damage of the matrix in each layup.Finally,in order to improve the anti-collision performance and anti-damage characteristics of FRP hull with double-side skin,various optimization and improvement measures are proposed from the perspectives of FRP ply design and hull structure design,respectively,including the design of FRP ply thickness and ply angle,and in the form of foam aluminum filling material in the two-way hat-shaped stiffener cavity of the hull.Various forms of optimization effects and more applicable collision conditions are obtained through calculation and analysis,providing a simple reference for practical engineering applications.