In the finite element analysis of the anti-bird impact performance of radome,it is necessary to use the FEM-SPH coupling method to simulate the dynamic mechanical response process in order to effectively overcome the computational instability of FEM in simulating large local deformation of bird body,better simulate the spreading and splashing process of the bird body and improve the calculation accuracy of the contact area between the bird body and the radome.In this paper,FEM,SPH and FEM-SPH coupling methods were used respectively to analyze the dynamic shock response process of radome with a 1.8 Kg bird body impacting different positions at a speed of 150m/s.The simulation results show that the FEM and SPH coupling method was able to bring into full play to the advantages of FEM and SPH,and can describe the deformation,failure and spreading process of the bird more accurately.Further studies found that the aluminum foam sandwich layer material played a major role in energy absorption,and the bird strike position had a significant effect on the overall deformation of the radome.In addition,the change of the position of the bird strike had a significant effect on the overall deformation of the radome.The most dangerous position of bird strike occurred at the lower position of the lower middle position of the radome,and the maximum displacement was 123.5 mm,which was 1.8 times of the maximum displacement value of the upper position.
Honeycomb sandwich structureradomebird strikeFEM-SPH coupling methodimpact energy
NETL
NSTL
维普
万方数据
