Research On The High Velocity Impact Property Of Fiber Metal Laminates

During the flying process of the aircrafts will inevitably suffer some impact damages from the hail, stones in the runway and birds. When the aircraft in high speed, any collision may lead to a disastrous consequences, which may produce a great threat to aviation security. Therefore, the research on the aviation materials impact resistance is necessary. At present many advanced aircrafts use the FMLs as main materials in the fuselage panel or the wing leading edges, which owes man advantages such as high specific strength and stiffness, high toughness and excellent impact and corrosion resistance. It becomes one of the highlights in the aviation materials at present. In our country, the research on FMLs start relatively late and unitary what is more about low velocity impact. In order to be more comprehensive understanding and applying the advanced composite materials, the research on high velocity impact damage of FMLs are really necessary.Based on the years' research results about composites and metals impact response, using PAM-CRASH software applying Johnson-Cook model, CDM and B-K criterion to establish a reasonable simulation model about FMLs subject to high velocity impact. When the simulation results have conformed to the test dates, the influence of different lays, proportion of aluminium alloy, configuration and the size of impact source are studied in this paper. Then, a preliminary exploration on the application of the FMLs has been done. A simulation model about stiffened panels subject to high velocity impact has been established and it has been used to study the influences of different impact angels and positions, find out the structure's vulnerable point and hope to provide certain reference for the direction of design and test.