Researches And Applications On The Dynamic Responses Of Bird Strike On Fiber Metal Laminates

With the development of high-speed performance at low altitude for the aircraft, bird strike hasattracted more and more attention. The accidents acused by bird strike are offen disastrous, whichbecome a great threat to the aviation safety. So the bird strike has become one of the key issues in theaircraft design process, and has been studied by lots of researches. The development of large civilairplane leads to the development of aviation materials.For example， a hybrid compositematerial-fiber metal laminates (FMLs) which combine the feature of metal and composite materialshas been used in the aircraft structures, This material is lighter than metal and it possess betterimpact/fatigue and corrosion resistance properties. Boeing and Airbus have already done a lot ofresearches on FMLs. However，few researches have been done on FMLs in China, especially the birdstrike problem. On this background, the bird strike analysis of the fiber metal laminates material isparticularly necessary.This bird strike accidents and application of composite materials such as fiber metal laminates onthe aircraft structure have been summarized. And it also takes a list of the main methods of bird strikereearch, which includes experimental study and numerical simulation. Sincethe body of birds presentin the fluid properties at high-speed impact and it is a typical fluid-structure interaction problem.，asmoothed particle hydrodynamics (SPH) method has been choosen.After the summarize of SPH theory, a analysis model of bird impact on steel plate has beenestablished, and the results are in good agreement with experiment. On this basis, the paper hasestablished the progressive damage model of FMLs. By analyzing the anti-bird strike performance ofthis model, we can get the conclusion that FMLs is better than metal on bird strike. At the same time,some factors which affect the anti-bird strike performance of FMLs have been analyzed, such asdifferent layups, different matel materials and different metal layer thickness.Finally, a preliminary exploration on the application of the FMLs.has been done. A bird strikeannlysis has been taken for a typical aricraft leading edge sructure, and the material of the skin isFMLs.Through this work, it will provide a reference for the future tests.