BIRD STRIKE DAMAGE ASSESSMENT FOR AN AIRCRAFT TAIL PLANE
Keywords:
bird strike, aircraf, failure, FEM model, bilinear isotropic material, equivalent plastic strainAbstract
Bird strike is a major threat to both fixed and rotary wing aircraft, damaging the nose section, wings, or propulsion elements. It involves a complex material failure under dynamic, loads. The purpose of this work is to perform numerical predictions in the case of a horizontal tail plane, considering a number of span wise impact locations. Three types of water birds are considered, using a Lagrangian model, shaped as a rounded cylinder. A bilinear isotropic material with failure criterion is considered, in order to overcome the numerical problems typically related to the large displacements of Lagrangian models. Simulations help to locate the most damaged zones and are helpful for improving the structure design by changing the position and size of the structural members. The results are going to be correlated with accident records in order to better understand safety requirements.
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