Parameters inversion on bird constitutive model Part I: Study on experiment of bird striking on plate

In order to obtain the mechanical parameters of the bird during the process of bird striking, numerical simulations and experiments of bird striking on plate are studied in the paper. The bird mass is 1.8 kg and 3.6 kg respectively, and the plate is made by LY12 aluminium alloy with the thickness of 10 mm and 14 mm and 45^# steel with the thickness of 4.5 mm and 8.0 mm. Sixteen groups of experiments are performed in the present paper with the bird velocity at 70, 120, 170 m/s, respectively. The histories of displacement-time and strain-time of plate as well as the force-time are measured by the dynamic data acquisition system, and the whole process of dynamic response during bird striking on plate is recorded by high-speed camera system. The results of the experiments indicate that the repeatability of the impacting velocities and the measured results for twice experiments in one group are very good. The reaction time of bird striking is millisecond, so its behavior belongs to impact dynamics; there exists strong coupling between the bird and the plate. The deformation of the plate is very big and the ratio of the plate displacement at the center point to the plate thickness is 7.9. The fluid behavior of the bird is obvious with the increment of the impacting velocity.