Research On Interlaminar Performance Of Three-dimensional Structure Reinforcement Fiber Metal Laminate

Fiber metal laminate(FMLs)is a kind of thin-layer composite structure which is made of metal alloy and composite material solidified under certain temperature and pressure.It combines the common advantages of metal and prepreg,and has a high ratio strength and specific stiffness,high damage tolerance and good impact resistance.These characteristics make fiber metal laminates successfully applied in the aerospace field.However,as a kind of interlaminar hybrid material,the weak interface bonding ability of fiber metal laminates is a very obvious problem.During the application process,it is very easy to occur interlaminar damage,which makes its strength and stiffness decline,and ultimately leads to the failure of the whole structure,which severely limits the further application of fiber metal laminates.Aiming at the problem of weaker interlayer performance of fiber metal laminates,a kind of fiber metal laminates with reinforced structure is proposed in this paper.Through the additive manufacturing technology,the metal layer is designed and manufactured to improve its bonding characteristics with carbon fiber prepreg.The fiber prepreg layer is anchored together by a cylindrical 3D reinforcement structure on the metal surface to improve its bonding strength.In the laboratory,hot press forming technology was used to prepare fiber metal laminates with 3D reinforcement structure,and the interface of the prepared fiber metal laminates was analyzed.In order to verify its interlayer mechanical properties,the three-point bending model and compression model were established using ABAQUS finite element simulation technology,and its interlayer properties and damage evolution were analyzed.The content of this article is as follows:(1)The method of combining progressive damage and cohesive force theory,using threedimensional Hashin failure criterion and stiffness reduction scheme to write an external UMAT subprogram to analyze the fiber prepreg damage initiation,damage evolution and damage form.At the same time,the ductile damage criterion is introduced to analyze the onset of damage to metal materials.(2)Use SolidWorks 3D software to model the metal layer,import the established model into the additive manufacturing machine tool software,and print the prepared metal layer.The vacuum hot pressing technology is used to prepare the fiber metal laminate,and the prepared fiber metal laminate is observed and analyzed by using an ultra-depth microscope.Test the compression performance of the prepared 3D reinforced fiber metal laminate and observe and analyze the damage morphology.(3)ABAQUS finite element analysis software was used to establish a three-point bending and compression simulation model of fiber-metal laminated plywood with cylindrical 3D reinforcement structure,to analyze the influence of the number of 3D reinforcement,3D reinforcement spacing and 3D reinforcement height on the three-point bending and compression performance of fiber-metal laminated plywood.