Impact with flying birds also called“bird strikes”can be critical for flight safety especially when small general aviation airplanes are involved. Nowadays, collisions between airplanes and birds are becoming much more frequent because of the increasing air traffic. The Federal Aviation Administration airworthiness rules obliges an airplane to be able to complete the flight after an impact with a bird of medium dimension. Indeed, during the certification process, an airplane must prove its capability to land safely after a representative impact event . The bird strike event is a short duration (milli-seconds range)/high intensity loads event characterized by a strong interaction among the impact energy, the bird deformation and the airplane component structural behavior. During the bird strike, the target (airplane structure) and the projectile (bird) are both subjected to large deformations and inelastic strain rates. To obtain an accurate prediction of the bird strike event induced damage, it is important to model carefully the bird shape. Actually, several bird models have been developed, based on test data during the last 30 years.
The aircraft cabin is modeled as three dimensional shell part and bird is model as solid part. You can see a schematic of the simulation at below
Glass is modeled as elastic material and to model bird behavior Us-Up equation of state has been used.Dynamic explicit is appropriate for this analysis . To model particle elements on the bird part modification of the input file has been implied. General contact has crated in the input file between cabin and bird node.You can see some figures of the result at below
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