Study On Impact Resistance Of Fiber-reinforced Metal Hybrid Laminates

The fiber / metal hybrid laminate is a composite material board formed by alternately laminating glass fiber and metal wire mesh,using resin as a bonding material,and curing under normal temperature and vacuum conditions to combine the advantages of the two materials.Traditional laminates are relatively simple to process and manufacture.Compared with traditional forms of composite laminates,adding a metal mesh to the laminates can make the laminates have better impact resistance when subjected to load impact.However,for low-speed impact on laminates of different lamination types,the residual strength and reduced stiffness of the damaged structure are not systematically summarized.It is still necessary to study the impact resistance of fiber / metal hybrid laminates and The compression properties of metal hybrid laminates change after being impacted.Firstly,a low-speed impact test was performed on the fiber / metal hybrid laminate without undoped foam core.The composite material was impacted with different energies.The obtained absorbed energy-time,impact load-time,deformation displacement-time,impact Velocity-time curves were sorted out,and the impact of impact energy and laminate lay-up method on damage was analyzed.The results show that under the incident energy of 24 J,the Ply-I and Ply-II samples are completely penetrated by the impactor,while the impactor rebounds in other samples.During the impact of the test piece,the incident energy is mainly consumed by fibers / broken wires and delamination;by adding a steel wire mesh to the fiber /metal hybrid laminate,the tensile strength,impact resistance and energy absorption of the structure are significantly improved.Secondly,ABAQUS finite element numerical simulation was performed.The finite element simulation results are in good agreement with the experimental results.The finite element simulation model can be used to analyze the low-speed impact behavior of the design structure.The results show that the addition of metal wire mesh to the composite laminate can significantly improve the tensile strength,impact resistance and energy absorption of the laminate structure,and at the same time cushion the fiber / metal hybrid laminates during contact in the impact specimen.Layered damage.Finally,the fiber reinforced metal hybrid laminate with the foam core is subjected to an impact test.The impact method is the same as the low speed impact test method of the fiber /metal hybrid laminate without the foam core.A CAI test was performed to evaluate the residual compressive strength of the sandwich panel,and a SEM scan was performed on the damaged area of the specimen after impact.The results show that with the increase of incidentenergy,fiber / mesh fracture and foam core cracking are the main damage modes in impact,and the addition of wire mesh to the laminate can enhance its stability.After the laminates of different layup forms are subjected to the same energy impact,the embedded metal mesh in the laminate has higher compressive strength than the non-embedded metal mesh laminate.The CAI test is performed after the impact energy increases.The compressive capacity of fiber / metal hybrid laminates gradually decreased.After fitting the values,it can be found that the compressive strength of laminates decreased linearly.