Study On Dynamic Response Of Fiber-Metal Laminates Subjected To Confined Blast Loading

The semi-armor-piercing implosive missile has become a major threat to vitality and combat effectiveness of large surface vessels.Generally,there are two countermeasures to reduce the damage of ship structure caused by blast loadings from antiship weapons,mitigating the explosive load or improving the anti-blast ability of the ship structure.With the rapid development of material science and technology,the fibermetal laminates made of alternately layered fiber-reinforced composites and metal sheets have been widely used in vehicles,aerospace and other fields,due to their excellent specific strength,specific stiffness and impact resistance.It also has a promising application in the ship protective structures to resist the blast load.Therefore,based on the requirements of the design of the ship’s protective structure,experimental tests,theoretical analysis and calculations on the dynamic response of thermoplastic glass fiber reinforced aluminum alloy laminates under confined blast loads are carried out in this paper.In order to systematically analyze the dynamic response of fiber metal laminates under the confined explosion loads,the experiments of different configurations of fibermetal laminate subjected to confined blast load in the chamber were performed.The dynamic response process of fiber-metal laminates was acquired by employing the 3D digital image correlation(3D-DIC)method,the final deformation of the fiber metal laminate was obtained by a three-dimensional scanning method after the explosion.In addition,the damage modes of the different configurations of the fiber metal laminate were obtained and analyzed.Based on the experimental observation and results,a theoretical analysis on the deformation of fiber-metal laminates under confined blast load was carried out.Combining the characteristics of the confined explosion load and the structural response of the fiber metal laminate,this dissertation proposed a method for predicting the deflection of the fiber-metal laminates in consecutive stages.Based on the variational principle of energy,an analytical model for determining the deformation response of fiber-metal laminates subjected to confined blast load was established.By employing the MATLAB platform,the theoretical model was solved programmatically,and the calculation of the dynamic response of fiber-metal laminates under confined blast load was carried out.The accuracy and reliability of the theoretical calculation method were verified by comparing the theoretical calculation results with the experimental data.It provides a basis for the analysis of the explosion response and anti-explosion design of ship composite structures.