Study On Dynamic Response And Damage Of Foam Sandwich Structure Under High Speed Impact Of Ice Projectile

The ever-expanding field of composite materials is a testament to the continuous advancement of science and technology.Among these materials,the composite sandwich structure stands out for its exceptional properties,including a lightweight bulid,remarkable strength,high temperature resistance,and corrosion resistance.The aerospace industry in particular,has extensively employed composite sandwich structures due to these characteristics.Nevertheless,as the utilization of composite sandwich structures grows,it is essential to consider the threat of hailstorms when utilizing them in aviation.To address this issue,this study focuses on the design and manufacture of a carbon fiber/PMI foam sandwich structure.By means of experiments and numerical simulations,we investigate the dynamic response and damage characteristics of this carbon fiber/PMI foam sandwich(CPS)structure under the impact of ice projectiles.The outcomes of this research are as follows:(1)The compressive strength and elastic modulus of carbon fibers and PMI foam in twodimensional planar woven carbon fiber laminates were experimentally tested.The goal of the study was to obtain accurate material parameters that can be used in numerical simulations.Specifically,the study focused on characterizing the intrinsic parameters of carbon fibers and PMI foam in order to provide accurate and reliable data for simulations(2)Impact experiments were conducted on two types of CPS target panels,each consisting of carbon fiber panels with different thicknesses,using ice projectiles at various impact velocities.The results showed that the degree of damage to the target panels increased with increasing impact velocity of the ice projectiles.The main types of damage observed were damage to the PMI core and penetration damage to the CPS target panel.When penetration damage occurred,the deformation was primarily localized,and the overall deformation was relatively decressing.(3)The numerical simulation of the vertical impact of the ice projectiles on the CPS target plate was carried out by the finite element model established in this paper,and the study of the dynamic response and damage characteristics law of the CPS target plate was carried out from two aspects: impact velocity and panel thickness.The results show that the large impact energy and peak impact force of the ice projectiles lead to serious damage of the PMI foam core layer in the CPS target plate,serious deformation of the CPS backing plate,and high energy absorption rate of the structure as a whole.When the carbon fiber panel is thin,damage occurs on the bullet-accepting surface,stress concentration occurs at the impact point,local deformation intensifies,and overall deformation becomes smaller,resulting in poor energy absorption of the foam core and causing serious damage to the back panel.(4)This paper presents a numerical simulation study on the dynamic response and damage characteristics of CPS target plates subjected to impacts from ice projectiles,considering the angle of incidence and impact velocity.Results showed that for the same impact velocity,smaller incidence angles and higher initial impact velocities led to higher peak impact forces and increased damage to the CPS structure.The impact velocity was analyzed in terms of its normal and tangential components,where the normal impact velocity influenced the impact force of the ice projectiles and the maximum displacement of the CPS backplane,while the tangential impact velocity affected the degree of deflection of the maximum deformation point of the CPS backing plate.This paper investigates the dynamic response and damage characteristics of composite foam sandwich structures subjected to impacts from ice projectiles,using carbon fiber/PMI foam sandwich structures as the research target.The aim is to provide insights and reference data on the behavior of such structures under impact loading.